Merge c8fb4c17f1 into 51cb6cae16

Allow instance admins to add custom CSS that will affect
every page of their instance.

This is done with a new CustomCSS instance setting that
works pretty much exactly like the Users CustomCSS property.
This custom CSS is then requested for every page load.
User styles/themes take precedence over this CSS.

docs/admin/settings.md

@@ -167,3 +167,11 @@ Links to the set contact account and/or email address will appear on the footer
 The selected **contact user** must be an active (not suspended) admin and/or moderator on the instance.
 
 If you're on a single-user instance and you give admin privileges to your main account, you can just fill in your own username here; you don't need to make a separate admin account just for this.
+
+### Instance Custom CSS
+
+custom CSS allows you to further customize the way your instance looks when visited through a browser.
+
+This custom CSS will be applied to all pages of your instance. Users themes and CSS still take precedence over this customization.
+
+See the [Custom CSS](./custom_css.md) page for some tips on writing custom CSS for your instance.

docs/api/swagger.yaml

@@ -1564,6 +1564,10 @@ definitions:
                 $ref: '#/definitions/instanceV1Configuration'
             contact_account:
                 $ref: '#/definitions/account'
+            custom_css:
+                description: Custom CSS for the instance.
+                type: string
+                x-go-name: CustomCSS
             debug:
                 description: Whether or not instance is running in DEBUG mode. Omitted if false.
                 type: boolean
@@ -1744,6 +1748,10 @@ definitions:
                 $ref: '#/definitions/instanceV2Configuration'
             contact:
                 $ref: '#/definitions/instanceV2Contact'
+            custom_css:
+                description: Instance Custom Css
+                type: string
+                x-go-name: CustomCSS
             debug:
                 description: Whether or not instance is running in DEBUG mode. Omitted if false.
                 type: boolean

go.mod

@@ -44,7 +44,7 @@ require (
 	github.com/miekg/dns v1.1.62
 	github.com/minio/minio-go/v7 v7.0.78
 	github.com/mitchellh/mapstructure v1.5.0
-	github.com/ncruces/go-sqlite3 v0.19.0
+	github.com/ncruces/go-sqlite3 v0.20.0
 	github.com/oklog/ulid v1.3.1
 	github.com/prometheus/client_golang v1.20.5
 	github.com/spf13/cobra v1.8.1

go.sum

@@ -434,8 +434,8 @@ github.com/moul/http2curl v1.0.0 h1:dRMWoAtb+ePxMlLkrCbAqh4TlPHXvoGUSQ323/9Zahs=
 github.com/moul/http2curl v1.0.0/go.mod h1:8UbvGypXm98wA/IqH45anm5Y2Z6ep6O31QGOAZ3H0fQ=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
-github.com/ncruces/go-sqlite3 v0.19.0 h1:yebbD/cP8Gf+7nKoUin2ATjnqJK2VvyS30d3xsjRp5k=
-github.com/ncruces/go-sqlite3 v0.19.0/go.mod h1:yL4ZNWGsr1/8pcLfpPW1RT1WFdvyeHonrgIwwi4rvkg=
+github.com/ncruces/go-sqlite3 v0.20.0 h1:/nBLvYxj7sk9S6y57nmMFvoQ/KJtGo0pNi8J80s8oJU=
+github.com/ncruces/go-sqlite3 v0.20.0/go.mod h1:yL4ZNWGsr1/8pcLfpPW1RT1WFdvyeHonrgIwwi4rvkg=
 github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
 github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=

internal/api/client/instance/instancepatch.go

@@ -175,6 +175,7 @@ func validateInstanceUpdate(form *apimodel.InstanceSettingsUpdateRequest) error
 		form.ContactEmail == nil &&
 		form.ShortDescription == nil &&
 		form.Description == nil &&
+		form.CustomCSS == nil &&
 		form.Terms == nil &&
 		form.Avatar == nil &&
 		form.AvatarDescription == nil &&

internal/api/model/instance.go

@@ -33,6 +33,8 @@ type InstanceSettingsUpdateRequest struct {
 	ShortDescription *string `form:"short_description" json:"short_description" xml:"short_description"`
 	// Longer description of the instance, max 5,000 chars. HTML formatting accepted.
 	Description *string `form:"description" json:"description" xml:"description"`
+	// Custom CSS for the instance.
+	CustomCSS *string `form:"custom_css" json:"custom_css,omitempty" xml:"custom_css"`
 	// Terms and conditions of the instance, max 5,000 chars. HTML formatting accepted.
 	Terms *string `form:"terms" json:"terms" xml:"terms"`
 	// Image to use as the instance thumbnail.

internal/api/model/instancev1.go

@@ -38,6 +38,8 @@ type InstanceV1 struct {
 	//
 	// This should be displayed on the 'about' page for an instance.
 	Description string `json:"description"`
+	// Custom CSS for the instance.
+	CustomCSS string `json:"custom_css,omitempty"`
 	// Raw (unparsed) version of description.
 	DescriptionText string `json:"description_text,omitempty"`
 	// A shorter description of the instance.

internal/api/model/instancev2.go

@@ -53,6 +53,8 @@ type InstanceV2 struct {
 	Description string `json:"description"`
 	// Raw (unparsed) version of description.
 	DescriptionText string `json:"description_text,omitempty"`
+	// Instance Custom Css
+	CustomCSS string `json:"custom_css,omitempty"`
 	// Basic anonymous usage data for this instance.
 	Usage InstanceV2Usage `json:"usage"`
 	// An image used to represent this instance.

internal/db/bundb/migrations/20240924222938_add_instance_custom_css.go

@@ -0,0 +1,44 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package migrations
+
+import (
+	"context"
+	"strings"
+
+	"github.com/uptrace/bun"
+)
+
+func init() {
+	up := func(ctx context.Context, db *bun.DB) error {
+		_, err := db.ExecContext(ctx, "ALTER TABLE ? ADD COLUMN ? TEXT", bun.Ident("instances"), bun.Ident("custom_css"))
+		if err != nil && !(strings.Contains(err.Error(), "already exists") || strings.Contains(err.Error(), "duplicate column name") || strings.Contains(err.Error(), "SQLSTATE 42701")) {
+			return err
+		}
+		return nil
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		_, err := db.ExecContext(ctx, "ALTER TABLE ? DROP COLUMN ?", bun.Ident("instances"), bun.Ident("custom_css"))
+		return err
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}

internal/gtsmodel/instance.go

@@ -34,6 +34,7 @@ type Instance struct {
 	ShortDescriptionText   string       `bun:""`                                                            // Raw text version of short description (before parsing).
 	Description            string       `bun:""`                                                            // Longer description of this instance.
 	DescriptionText        string       `bun:""`                                                            // Raw text version of long description (before parsing).
+	CustomCSS              string       `bun:",nullzero"`                                                   // Custom CSS for the instance.
 	Terms                  string       `bun:""`                                                            // Terms and conditions of this instance.
 	TermsText              string       `bun:""`                                                            // Raw text version of terms (before parsing).
 	ContactEmail           string       `bun:""`                                                            // Contact email address for this instance

internal/processing/instance.go

@@ -227,6 +227,17 @@ func (p *Processor) InstancePatch(ctx context.Context, form *apimodel.InstanceSe
 		columns = append(columns, []string{"description", "description_text"}...)
 	}
 
+	// validate & update site custom css if it's set on the form
+	if form.CustomCSS != nil {
+		customCSS := *form.CustomCSS
+		if err := validate.InstanceCustomCSS(customCSS); err != nil {
+			return nil, gtserror.NewErrorBadRequest(err, err.Error())
+		}
+
+		instance.CustomCSS = text.SanitizeToPlaintext(customCSS)
+		columns = append(columns, []string{"custom_css"}...)
+	}
+
 	// Validate & update site
 	// terms if set on the form.
 	if form.Terms != nil {

internal/typeutils/internaltofrontend.go

@@ -1535,6 +1535,7 @@ func (c *Converter) InstanceToAPIV1Instance(ctx context.Context, i *gtsmodel.Ins
 		Title:                i.Title,
 		Description:          i.Description,
 		DescriptionText:      i.DescriptionText,
+		CustomCSS:            i.CustomCSS,
 		ShortDescription:     i.ShortDescription,
 		ShortDescriptionText: i.ShortDescriptionText,
 		Email:                i.ContactEmail,
@@ -1662,6 +1663,7 @@ func (c *Converter) InstanceToAPIV2Instance(ctx context.Context, i *gtsmodel.Ins
 		SourceURL:       instanceSourceURL,
 		Description:     i.Description,
 		DescriptionText: i.DescriptionText,
+		CustomCSS:       i.CustomCSS,
 		Usage:           apimodel.InstanceV2Usage{}, // todo: not implemented
 		Languages:       config.GetInstanceLanguages().TagStrs(),
 		Rules:           c.InstanceRulesToAPIRules(i.Rules),

internal/validate/formvalidation.go

@@ -189,6 +189,16 @@ func CustomCSS(customCSS string) error {
 	return nil
 }
 
+func InstanceCustomCSS(customCSS string) error {
+
+	maximumCustomCSSLength := config.GetAccountsCustomCSSLength()
+	if length := len([]rune(customCSS)); length > maximumCustomCSSLength {
+		return fmt.Errorf("custom_css must be less than %d characters, but submitted custom_css was %d characters", maximumCustomCSSLength, length)
+	}
+
+	return nil
+}
+
 // EmojiShortcode just runs the given shortcode through the regular expression
 // for emoji shortcodes, to figure out whether it's a valid shortcode, ie., 2-30 characters,
 // a-zA-Z, numbers, and underscores.

internal/web/about.go

@@ -54,7 +54,7 @@ func (m *Module) aboutGETHandler(c *gin.Context) {
 		Template:    "about.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssAbout},
+		Stylesheets: []string{cssAbout, instanceCustomCSSPath},
 		Extra: map[string]any{
 			"showStrap":        true,
 			"blocklistExposed": config.GetInstanceExposeSuspendedWeb(),

internal/web/confirmemail.go

@@ -127,8 +127,9 @@ func (m *Module) confirmEmailPOSTHandler(c *gin.Context) {
 	// Serve page informing user that their
 	// email address is now confirmed.
 	page := apiutil.WebPage{
-		Template: "confirmed_email.tmpl",
-		Instance: instance,
+		Template:    "confirmed_email.tmpl",
+		Instance:    instance,
+		Stylesheets: []string{instanceCustomCSSPath},
 		Extra: map[string]any{
 			"email":    user.Email,
 			"username": user.Account.Username,

internal/web/customcss.go

@@ -55,3 +55,22 @@ func (m *Module) customCSSGETHandler(c *gin.Context) {
 	c.Header(cacheControlHeader, cacheControlNoCache)
 	c.Data(http.StatusOK, textCSSUTF8, []byte(customCSS))
 }
+
+func (m *Module) instanceCustomCSSGETHandler(c *gin.Context) {
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.TextCSS); err != nil {
+		apiutil.WebErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	instanceV1, errWithCode := m.processor.InstanceGetV1(c.Request.Context())
+	if errWithCode != nil {
+		apiutil.WebErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	instanceCustomCSS := instanceV1.CustomCSS
+
+	c.Header(cacheControlHeader, cacheControlNoCache)
+	c.Data(http.StatusOK, textCSSUTF8, []byte(instanceCustomCSS))
+}

internal/web/domain-blocklist.go

@@ -67,7 +67,7 @@ func (m *Module) domainBlockListGETHandler(c *gin.Context) {
 		Template:    "domain-blocklist.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssFA},
+		Stylesheets: []string{cssFA, instanceCustomCSSPath},
 		Javascript:  []string{jsFrontend},
 		Extra:       map[string]any{"blocklist": domainBlocks},
 	}

internal/web/index.go

@@ -59,7 +59,7 @@ func (m *Module) indexHandler(c *gin.Context) {
 		Template:    "index.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssAbout, cssIndex},
+		Stylesheets: []string{cssAbout, cssIndex, instanceCustomCSSPath},
 		Extra:       map[string]any{"showStrap": true},
 	}
 

internal/web/profile.go

@@ -132,7 +132,7 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 	}
 
 	// Prepare stylesheets for profile.
-	stylesheets := make([]string, 0, 6)
+	stylesheets := make([]string, 0, 7)
 
 	// Basic profile stylesheets.
 	stylesheets = append(
@@ -142,6 +142,7 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 			cssStatus,
 			cssThread,
 			cssProfile,
+			instanceCustomCSSPath,
 		}...,
 	)
 

internal/web/settings-panel.go

@@ -53,6 +53,7 @@ func (m *Module) SettingsPanelHandler(c *gin.Context) {
 			cssProfile, // Used for rendering stub/fake profiles.
 			cssStatus,  // Used for rendering stub/fake statuses.
 			cssSettings,
+			instanceCustomCSSPath,
 		},
 		Javascript: []string{jsSettings},
 	}

internal/web/signup.go

@@ -126,9 +126,10 @@ func (m *Module) signupPOSTHandler(c *gin.Context) {
 	// Serve a page informing the
 	// user that they've signed up.
 	page := apiutil.WebPage{
-		Template: "signed-up.tmpl",
-		Instance: instance,
-		OGMeta:   apiutil.OGBase(instance),
+		Template:    "signed-up.tmpl",
+		Instance:    instance,
+		Stylesheets: []string{instanceCustomCSSPath},
+		OGMeta:      apiutil.OGBase(instance),
 		Extra: map[string]any{
 			"email":    user.UnconfirmedEmail,
 			"username": user.Account.Username,

internal/web/tag.go

@@ -59,7 +59,7 @@ func (m *Module) tagGETHandler(c *gin.Context) {
 		Template:    "tag.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssFA, cssThread, cssTag},
+		Stylesheets: []string{cssFA, cssThread, cssTag, instanceCustomCSSPath},
 		Extra:       map[string]any{"tagName": tagName},
 	}
 

internal/web/thread.go

@@ -115,7 +115,7 @@ func (m *Module) threadGETHandler(c *gin.Context) {
 	}
 
 	// Prepare stylesheets for thread.
-	stylesheets := make([]string, 0, 5)
+	stylesheets := make([]string, 0, 6)
 
 	// Basic thread stylesheets.
 	stylesheets = append(
@@ -131,6 +131,7 @@ func (m *Module) threadGETHandler(c *gin.Context) {
 	if theme := targetAccount.Theme; theme != "" {
 		stylesheets = append(
 			stylesheets,
+			instanceCustomCSSPath,
 			themesPathPrefix+"/"+theme,
 		)
 	}

internal/web/web.go

@@ -36,20 +36,21 @@
 )
 
 const (
-	confirmEmailPath   = "/" + uris.ConfirmEmailPath
-	profileGroupPath   = "/@:username"
-	statusPath         = "/statuses/:" + apiutil.WebStatusIDKey // leave out the '/@:username' prefix as this will be served within the profile group
-	tagsPath           = "/tags/:" + apiutil.TagNameKey
-	customCSSPath      = profileGroupPath + "/custom.css"
-	rssFeedPath        = profileGroupPath + "/feed.rss"
-	assetsPathPrefix   = "/assets"
-	distPathPrefix     = assetsPathPrefix + "/dist"
-	themesPathPrefix   = assetsPathPrefix + "/themes"
-	settingsPathPrefix = "/settings"
-	settingsPanelGlob  = settingsPathPrefix + "/*panel"
-	userPanelPath      = settingsPathPrefix + "/user"
-	adminPanelPath     = settingsPathPrefix + "/admin"
-	signupPath         = "/signup"
+	confirmEmailPath      = "/" + uris.ConfirmEmailPath
+	profileGroupPath      = "/@:username"
+	statusPath            = "/statuses/:" + apiutil.WebStatusIDKey // leave out the '/@:username' prefix as this will be served within the profile group
+	tagsPath              = "/tags/:" + apiutil.TagNameKey
+	customCSSPath         = profileGroupPath + "/custom.css"
+	instanceCustomCSSPath = "/custom.css"
+	rssFeedPath           = profileGroupPath + "/feed.rss"
+	assetsPathPrefix      = "/assets"
+	distPathPrefix        = assetsPathPrefix + "/dist"
+	themesPathPrefix      = assetsPathPrefix + "/themes"
+	settingsPathPrefix    = "/settings"
+	settingsPanelGlob     = settingsPathPrefix + "/*panel"
+	userPanelPath         = settingsPathPrefix + "/user"
+	adminPanelPath        = settingsPathPrefix + "/admin"
+	signupPath            = "/signup"
 
 	cacheControlHeader    = "Cache-Control"     // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
 	cacheControlNoCache   = "no-cache"          // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#response_directives
@@ -114,6 +115,7 @@ func (m *Module) Route(r *router.Router, mi ...gin.HandlerFunc) {
 	r.AttachHandler(http.MethodGet, settingsPathPrefix, m.SettingsPanelHandler)
 	r.AttachHandler(http.MethodGet, settingsPanelGlob, m.SettingsPanelHandler)
 	r.AttachHandler(http.MethodGet, customCSSPath, m.customCSSGETHandler)
+	r.AttachHandler(http.MethodGet, instanceCustomCSSPath, m.instanceCustomCSSGETHandler)
 	r.AttachHandler(http.MethodGet, rssFeedPath, m.rssFeedGETHandler)
 	r.AttachHandler(http.MethodGet, confirmEmailPath, m.confirmEmailGETHandler)
 	r.AttachHandler(http.MethodPost, confirmEmailPath, m.confirmEmailPOSTHandler)

vendor/github.com/ncruces/go-sqlite3/README.md

@@ -1,4 +1,4 @@
-# Go bindings to SQLite using Wazero
+# Go bindings to SQLite using wazero
 
 [![Go Reference](https://pkg.go.dev/badge/image)](https://pkg.go.dev/github.com/ncruces/go-sqlite3)
 [![Go Report](https://goreportcard.com/badge/github.com/ncruces/go-sqlite3)](https://goreportcard.com/report/github.com/ncruces/go-sqlite3)
@@ -41,45 +41,6 @@ db.QueryRow(`SELECT sqlite_version()`).Scan(&version)
 - [`github.com/ncruces/go-sqlite3/gormlite`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/gormlite)
   provides a [GORM](https://gorm.io) driver.
 
-### Extensions
-
-- [`github.com/ncruces/go-sqlite3/ext/array`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/array)
-  provides the [`array`](https://sqlite.org/carray.html) table-valued function.
-- [`github.com/ncruces/go-sqlite3/ext/blobio`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/blobio)
-  simplifies [incremental BLOB I/O](https://sqlite.org/c3ref/blob_open.html).
-- [`github.com/ncruces/go-sqlite3/ext/bloom`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/bloom)
-  provides a [Bloom filter](https://github.com/nalgeon/sqlean/issues/27#issuecomment-1002267134) virtual table.
-- [`github.com/ncruces/go-sqlite3/ext/closure`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/closure)
-  provides a transitive closure virtual table.
-- [`github.com/ncruces/go-sqlite3/ext/csv`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/csv)
-  reads [comma-separated values](https://sqlite.org/csv.html).
-- [`github.com/ncruces/go-sqlite3/ext/fileio`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/fileio)
-  reads, writes and lists files.
-- [`github.com/ncruces/go-sqlite3/ext/hash`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/hash)
-  provides cryptographic hash functions.
-- [`github.com/ncruces/go-sqlite3/ext/lines`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/lines)
-  reads data [line-by-line](https://github.com/asg017/sqlite-lines).
-- [`github.com/ncruces/go-sqlite3/ext/pivot`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/pivot)
-  creates [pivot tables](https://github.com/jakethaw/pivot_vtab).
-- [`github.com/ncruces/go-sqlite3/ext/regexp`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/regexp)
-  provides regular expression functions.
-- [`github.com/ncruces/go-sqlite3/ext/statement`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/statement)
-  creates [parameterized views](https://github.com/0x09/sqlite-statement-vtab).
-- [`github.com/ncruces/go-sqlite3/ext/stats`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/stats)
-  provides [statistics](https://www.oreilly.com/library/view/sql-in-a/9780596155322/ch04s02.html) functions.
-- [`github.com/ncruces/go-sqlite3/ext/unicode`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/unicode)
-  provides [Unicode aware](https://sqlite.org/src/dir/ext/icu) functions.
-- [`github.com/ncruces/go-sqlite3/ext/uuid`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/uuid)
-  generates [UUIDs](https://en.wikipedia.org/wiki/Universally_unique_identifier).
-- [`github.com/ncruces/go-sqlite3/ext/zorder`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/zorder)
-  maps multidimensional data to one dimension.
-- [`github.com/ncruces/go-sqlite3/vfs/adiantum`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/adiantum)
-  wraps a VFS to offer encryption at rest.
-- [`github.com/ncruces/go-sqlite3/vfs/memdb`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/memdb)
-  implements an in-memory VFS.
-- [`github.com/ncruces/go-sqlite3/vfs/readervfs`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/readervfs)
-  implements a VFS for immutable databases.
-
 ### Advanced features
 
 - [incremental BLOB I/O](https://sqlite.org/c3ref/blob_open.html)
@@ -92,7 +53,11 @@ db.QueryRow(`SELECT sqlite_version()`).Scan(&version)
 - [math functions](https://sqlite.org/lang_mathfunc.html)
 - [full-text search](https://sqlite.org/fts5.html)
 - [geospatial search](https://sqlite.org/geopoly.html)
+- [Unicode support](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/unicode)
+- [statistics functions](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/stats)
 - [encryption at rest](vfs/adiantum/README.md)
+- [many extensions](ext/README.md)
+- [custom VFSes](vfs/README.md#custom-vfses)
 - [and more…](embed/README.md)
 
 ### Caveats

vendor/github.com/ncruces/go-sqlite3/blob.go

@@ -253,6 +253,7 @@ func (b *Blob) Seek(offset int64, whence int) (int64, error) {
 //
 // https://sqlite.org/c3ref/blob_reopen.html
 func (b *Blob) Reopen(row int64) error {
+	b.c.checkInterrupt(b.c.handle)
 	err := b.c.error(b.c.call("sqlite3_blob_reopen", uint64(b.handle), uint64(row)))
 	b.bytes = int64(b.c.call("sqlite3_blob_bytes", uint64(b.handle)))
 	b.offset = 0

vendor/github.com/ncruces/go-sqlite3/config.go

@@ -2,10 +2,12 @@
 
 import (
 	"context"
+	"strconv"
+
+	"github.com/tetratelabs/wazero/api"
 
 	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/ncruces/go-sqlite3/vfs"
-	"github.com/tetratelabs/wazero/api"
 )
 
 // Config makes configuration changes to a database connection.
@@ -15,8 +17,19 @@
 //
 // https://sqlite.org/c3ref/db_config.html
 func (c *Conn) Config(op DBConfig, arg ...bool) (bool, error) {
+	if op < DBCONFIG_ENABLE_FKEY || op > DBCONFIG_REVERSE_SCANORDER {
+		return false, MISUSE
+	}
+
+	// We need to call sqlite3_db_config, a variadic function.
+	// We only support the `int int*` variants.
+	// The int is a three-valued bool: -1 queries, 0/1 sets false/true.
+	// The int* points to where new state will be written to.
+	// The vararg is a pointer to an array containing these arguments:
+	// an int and an int* pointing to that int.
+
 	defer c.arena.mark()()
-	argsPtr := c.arena.new(2 * ptrlen)
+	argsPtr := c.arena.new(intlen + ptrlen)
 
 	var flag int
 	switch {
@@ -63,18 +76,23 @@ func logCallback(ctx context.Context, mod api.Module, _, iCode, zMsg uint32) {
 // https://sqlite.org/c3ref/file_control.html
 func (c *Conn) FileControl(schema string, op FcntlOpcode, arg ...any) (any, error) {
 	defer c.arena.mark()()
+	ptr := c.arena.new(max(ptrlen, intlen))
 
 	var schemaPtr uint32
 	if schema != "" {
 		schemaPtr = c.arena.string(schema)
 	}
 
+	var rc uint64
+	var res any
 	switch op {
+	default:
+		return nil, MISUSE
+
 	case FCNTL_RESET_CACHE:
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), 0)
-		return nil, c.error(r)
 
 	case FCNTL_PERSIST_WAL, FCNTL_POWERSAFE_OVERWRITE:
 		var flag int
@@ -84,70 +102,69 @@ func (c *Conn) FileControl(schema string, op FcntlOpcode, arg ...any) (any, erro
 		case arg[0]:
 			flag = 1
 		}
-		ptr := c.arena.new(4)
 		util.WriteUint32(c.mod, ptr, uint32(flag))
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		return util.ReadUint32(c.mod, ptr) != 0, c.error(r)
+		res = util.ReadUint32(c.mod, ptr) != 0
 
 	case FCNTL_CHUNK_SIZE:
-		ptr := c.arena.new(4)
 		util.WriteUint32(c.mod, ptr, uint32(arg[0].(int)))
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		return nil, c.error(r)
 
 	case FCNTL_RESERVE_BYTES:
 		bytes := -1
 		if len(arg) > 0 {
 			bytes = arg[0].(int)
 		}
-		ptr := c.arena.new(4)
 		util.WriteUint32(c.mod, ptr, uint32(bytes))
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		return int(util.ReadUint32(c.mod, ptr)), c.error(r)
+		res = int(util.ReadUint32(c.mod, ptr))
 
 	case FCNTL_DATA_VERSION:
-		ptr := c.arena.new(4)
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		return util.ReadUint32(c.mod, ptr), c.error(r)
+		res = util.ReadUint32(c.mod, ptr)
 
 	case FCNTL_LOCKSTATE:
-		ptr := c.arena.new(4)
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		return vfs.LockLevel(util.ReadUint32(c.mod, ptr)), c.error(r)
+		res = vfs.LockLevel(util.ReadUint32(c.mod, ptr))
 
 	case FCNTL_VFS_POINTER:
-		ptr := c.arena.new(4)
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		const zNameOffset = 16
-		ptr = util.ReadUint32(c.mod, ptr)
-		ptr = util.ReadUint32(c.mod, ptr+zNameOffset)
-		name := util.ReadString(c.mod, ptr, _MAX_NAME)
-		return vfs.Find(name), c.error(r)
+		if rc == _OK {
+			const zNameOffset = 16
+			ptr = util.ReadUint32(c.mod, ptr)
+			ptr = util.ReadUint32(c.mod, ptr+zNameOffset)
+			name := util.ReadString(c.mod, ptr, _MAX_NAME)
+			res = vfs.Find(name)
+		}
 
 	case FCNTL_FILE_POINTER, FCNTL_JOURNAL_POINTER:
-		ptr := c.arena.new(4)
-		r := c.call("sqlite3_file_control",
+		rc = c.call("sqlite3_file_control",
 			uint64(c.handle), uint64(schemaPtr),
 			uint64(op), uint64(ptr))
-		const fileHandleOffset = 4
-		ptr = util.ReadUint32(c.mod, ptr)
-		ptr = util.ReadUint32(c.mod, ptr+fileHandleOffset)
-		return util.GetHandle(c.ctx, ptr), c.error(r)
+		if rc == _OK {
+			const fileHandleOffset = 4
+			ptr = util.ReadUint32(c.mod, ptr)
+			ptr = util.ReadUint32(c.mod, ptr+fileHandleOffset)
+			res = util.GetHandle(c.ctx, ptr)
+		}
 	}
 
-	return nil, MISUSE
+	if err := c.error(rc); err != nil {
+		return nil, err
+	}
+	return res, nil
 }
 
 // Limit allows the size of various constructs to be
@@ -234,10 +251,10 @@ func traceCallback(ctx context.Context, mod api.Module, evt TraceEvent, pDB, pAr
 	return rc
 }
 
-// WalCheckpoint checkpoints a WAL database.
+// WALCheckpoint checkpoints a WAL database.
 //
 // https://sqlite.org/c3ref/wal_checkpoint_v2.html
-func (c *Conn) WalCheckpoint(schema string, mode CheckpointMode) (nLog, nCkpt int, err error) {
+func (c *Conn) WALCheckpoint(schema string, mode CheckpointMode) (nLog, nCkpt int, err error) {
 	defer c.arena.mark()()
 	nLogPtr := c.arena.new(ptrlen)
 	nCkptPtr := c.arena.new(ptrlen)
@@ -250,19 +267,19 @@ func (c *Conn) WalCheckpoint(schema string, mode CheckpointMode) (nLog, nCkpt in
 	return nLog, nCkpt, c.error(r)
 }
 
-// WalAutoCheckpoint configures WAL auto-checkpoints.
+// WALAutoCheckpoint configures WAL auto-checkpoints.
 //
 // https://sqlite.org/c3ref/wal_autocheckpoint.html
-func (c *Conn) WalAutoCheckpoint(pages int) error {
+func (c *Conn) WALAutoCheckpoint(pages int) error {
 	r := c.call("sqlite3_wal_autocheckpoint", uint64(c.handle), uint64(pages))
 	return c.error(r)
 }
 
-// WalHook registers a callback function to be invoked
+// WALHook registers a callback function to be invoked
 // each time data is committed to a database in WAL mode.
 //
 // https://sqlite.org/c3ref/wal_hook.html
-func (c *Conn) WalHook(cb func(db *Conn, schema string, pages int) error) {
+func (c *Conn) WALHook(cb func(db *Conn, schema string, pages int) error) {
 	var enable uint64
 	if cb != nil {
 		enable = 1
@@ -311,3 +328,46 @@ func (c *Conn) SoftHeapLimit(n int64) int64 {
 func (c *Conn) HardHeapLimit(n int64) int64 {
 	return int64(c.call("sqlite3_hard_heap_limit64", uint64(n)))
 }
+
+// EnableChecksums enables checksums on a database.
+//
+// https://sqlite.org/cksumvfs.html
+func (c *Conn) EnableChecksums(schema string) error {
+	r, err := c.FileControl(schema, FCNTL_RESERVE_BYTES)
+	if err != nil {
+		return err
+	}
+	if r == 8 {
+		// Correct value, enabled.
+		return nil
+	}
+	if r == 0 {
+		// Default value, enable.
+		_, err = c.FileControl(schema, FCNTL_RESERVE_BYTES, 8)
+		if err != nil {
+			return err
+		}
+		r, err = c.FileControl(schema, FCNTL_RESERVE_BYTES)
+		if err != nil {
+			return err
+		}
+	}
+	if r != 8 {
+		// Invalid value.
+		return util.ErrorString("sqlite3: reserve bytes must be 8, is: " + strconv.Itoa(r.(int)))
+	}
+
+	// VACUUM the database.
+	if schema != "" {
+		err = c.Exec(`VACUUM ` + QuoteIdentifier(schema))
+	} else {
+		err = c.Exec(`VACUUM`)
+	}
+	if err != nil {
+		return err
+	}
+
+	// Checkpoint the WAL.
+	_, _, err = c.WALCheckpoint(schema, CHECKPOINT_RESTART)
+	return err
+}

vendor/github.com/ncruces/go-sqlite3/conn.go

@@ -8,9 +8,10 @@
 	"strings"
 	"time"
 
+	"github.com/tetratelabs/wazero/api"
+
 	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/ncruces/go-sqlite3/vfs"
-	"github.com/tetratelabs/wazero/api"
 )
 
 // Conn is a database connection handle.
@@ -204,6 +205,7 @@ func (c *Conn) PrepareFlags(sql string, flags PrepareFlag) (stmt *Stmt, tail str
 	tailPtr := c.arena.new(ptrlen)
 	sqlPtr := c.arena.string(sql)
 
+	c.checkInterrupt(c.handle)
 	r := c.call("sqlite3_prepare_v3", uint64(c.handle),
 		uint64(sqlPtr), uint64(len(sql)+1), uint64(flags),
 		uint64(stmtPtr), uint64(tailPtr))
@@ -457,8 +459,8 @@ func busyCallback(ctx context.Context, mod api.Module, pDB uint32, count int32)
 // https://sqlite.org/c3ref/db_status.html
 func (c *Conn) Status(op DBStatus, reset bool) (current, highwater int, err error) {
 	defer c.arena.mark()()
-	hiPtr := c.arena.new(4)
-	curPtr := c.arena.new(4)
+	hiPtr := c.arena.new(intlen)
+	curPtr := c.arena.new(intlen)
 
 	var i uint64
 	if reset {
@@ -484,8 +486,8 @@ func (c *Conn) TableColumnMetadata(schema, table, column string) (declType, coll
 	declTypePtr := c.arena.new(ptrlen)
 	collSeqPtr := c.arena.new(ptrlen)
 	notNullPtr := c.arena.new(ptrlen)
-	primaryKeyPtr := c.arena.new(ptrlen)
 	autoIncPtr := c.arena.new(ptrlen)
+	primaryKeyPtr := c.arena.new(ptrlen)
 	if schema != "" {
 		schemaPtr = c.arena.string(schema)
 	}
@@ -519,10 +521,3 @@ func (c *Conn) stmtsIter(yield func(*Stmt) bool) {
 		}
 	}
 }
-
-// DriverConn is implemented by the SQLite [database/sql] driver connection.
-//
-// Deprecated: use [github.com/ncruces/go-sqlite3/driver.Conn] instead.
-type DriverConn interface {
-	Raw() *Conn
-}

vendor/github.com/ncruces/go-sqlite3/const.go

@@ -13,6 +13,7 @@
 	_MAX_FUNCTION_ARG = 100
 
 	ptrlen = 4
+	intlen = 4
 )
 
 // ErrorCode is a result code that [Error.Code] might return.
@@ -177,6 +178,7 @@
 	DETERMINISTIC FunctionFlag = 0x000000800
 	DIRECTONLY    FunctionFlag = 0x000080000
 	INNOCUOUS     FunctionFlag = 0x000200000
+	SELFORDER1    FunctionFlag = 0x002000000
 	// SUBTYPE        FunctionFlag = 0x000100000
 	// RESULT_SUBTYPE FunctionFlag = 0x001000000
 )
@@ -245,6 +247,7 @@
 	DBCONFIG_TRUSTED_SCHEMA        DBConfig = 1017
 	DBCONFIG_STMT_SCANSTATUS       DBConfig = 1018
 	DBCONFIG_REVERSE_SCANORDER     DBConfig = 1019
+	// DBCONFIG_MAX                DBConfig = 1019
 )
 
 // FcntlOpcode are the available opcodes for [Conn.FileControl].

vendor/github.com/ncruces/go-sqlite3/embed/README.md

@@ -1,6 +1,6 @@
 # Embeddable Wasm build of SQLite
 
-This folder includes an embeddable Wasm build of SQLite 3.46.1 for use with
+This folder includes an embeddable Wasm build of SQLite 3.47.0 for use with
 [`github.com/ncruces/go-sqlite3`](https://pkg.go.dev/github.com/ncruces/go-sqlite3).
 
 The following optional features are compiled in:
@@ -36,6 +36,6 @@ You can use your own custom build of SQLite.
 Examples of custom builds of SQLite are:
 - [`github.com/ncruces/go-sqlite3/embed/bcw2`](https://github.com/ncruces/go-sqlite3/tree/main/embed/bcw2)
   built from a branch supporting [`BEGIN CONCURRENT`](https://sqlite.org/src/doc/begin-concurrent/doc/begin_concurrent.md)
-  and [Wal2](https://www.sqlite.org/cgi/src/doc/wal2/doc/wal2.md).
+  and [Wal2](https://sqlite.org/cgi/src/doc/wal2/doc/wal2.md).
 - [`github.com/asg017/sqlite-vec-go-bindings/ncruces`](https://github.com/asg017/sqlite-vec-go-bindings)
   which includes the [`sqlite-vec`](https://github.com/asg017/sqlite-vec) vector search extension.

vendor/github.com/ncruces/go-sqlite3/func.go

@@ -4,8 +4,9 @@
 	"context"
 	"sync"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
 // CollationNeeded registers a callback to be invoked

vendor/github.com/ncruces/go-sqlite3/internal/alloc/alloc_other.go

@@ -4,6 +4,21 @@
 
 import "github.com/tetratelabs/wazero/experimental"
 
-func Virtual(cap, max uint64) experimental.LinearMemory {
-	return Slice(cap, max)
+func NewMemory(cap, max uint64) experimental.LinearMemory {
+	return &sliceMemory{make([]byte, 0, cap)}
+}
+
+type sliceMemory struct {
+	buf []byte
+}
+
+func (b *sliceMemory) Free() {}
+
+func (b *sliceMemory) Reallocate(size uint64) []byte {
+	if cap := uint64(cap(b.buf)); size > cap {
+		b.buf = append(b.buf[:cap], make([]byte, size-cap)...)
+	} else {
+		b.buf = b.buf[:size]
+	}
+	return b.buf
 }

vendor/github.com/ncruces/go-sqlite3/internal/alloc/alloc_slice.go

@@ -1,24 +0,0 @@
-//go:build !(darwin || linux) || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
-
-package alloc
-
-import "github.com/tetratelabs/wazero/experimental"
-
-func Slice(cap, _ uint64) experimental.LinearMemory {
-	return &sliceMemory{make([]byte, 0, cap)}
-}
-
-type sliceMemory struct {
-	buf []byte
-}
-
-func (b *sliceMemory) Free() {}
-
-func (b *sliceMemory) Reallocate(size uint64) []byte {
-	if cap := uint64(cap(b.buf)); size > cap {
-		b.buf = append(b.buf[:cap], make([]byte, size-cap)...)
-	} else {
-		b.buf = b.buf[:size]
-	}
-	return b.buf
-}

vendor/github.com/ncruces/go-sqlite3/internal/alloc/alloc_unix.go

@@ -9,7 +9,7 @@
 	"golang.org/x/sys/unix"
 )
 
-func Virtual(_, max uint64) experimental.LinearMemory {
+func NewMemory(_, max uint64) experimental.LinearMemory {
 	// Round up to the page size.
 	rnd := uint64(unix.Getpagesize() - 1)
 	max = (max + rnd) &^ rnd

vendor/github.com/ncruces/go-sqlite3/internal/alloc/alloc_windows.go

@@ -11,7 +11,7 @@
 	"golang.org/x/sys/windows"
 )
 
-func Virtual(_, max uint64) experimental.LinearMemory {
+func NewMemory(_, max uint64) experimental.LinearMemory {
 	// Round up to the page size.
 	rnd := uint64(windows.Getpagesize() - 1)
 	max = (max + rnd) &^ rnd

vendor/github.com/ncruces/go-sqlite3/internal/util/bool.go

@@ -1,22 +0,0 @@
-package util
-
-import "strings"
-
-func ParseBool(s string) (b, ok bool) {
-	if len(s) == 0 {
-		return false, false
-	}
-	if s[0] == '0' {
-		return false, true
-	}
-	if '1' <= s[0] && s[0] <= '9' {
-		return true, true
-	}
-	switch strings.ToLower(s) {
-	case "true", "yes", "on":
-		return true, true
-	case "false", "no", "off":
-		return false, true
-	}
-	return false, false
-}

vendor/github.com/ncruces/go-sqlite3/internal/util/math.go

@@ -0,0 +1,29 @@
+package util
+
+import "math"
+
+func abs(n int) int {
+	if n < 0 {
+		return -n
+	}
+	return n
+}
+
+func GCD(m, n int) int {
+	for n != 0 {
+		m, n = n, m%n
+	}
+	return abs(m)
+}
+
+func LCM(m, n int) int {
+	if n == 0 {
+		return 0
+	}
+	return abs(n) * (abs(m) / GCD(m, n))
+}
+
+// https://developer.nvidia.com/blog/lerp-faster-cuda/
+func Lerp(v0, v1, t float64) float64 {
+	return math.FMA(t, v1, math.FMA(-t, v0, v0))
+}

vendor/github.com/ncruces/go-sqlite3/internal/util/mmap.go

@@ -1,4 +1,4 @@
-//go:build unix && (amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_noshm || sqlite3_nosys)
+//go:build unix && (386 || arm || amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_noshm || sqlite3_nosys)
 
 package util
 
@@ -7,17 +7,10 @@
 	"os"
 	"unsafe"
 
-	"github.com/ncruces/go-sqlite3/internal/alloc"
 	"github.com/tetratelabs/wazero/api"
-	"github.com/tetratelabs/wazero/experimental"
 	"golang.org/x/sys/unix"
 )
 
-func withAllocator(ctx context.Context) context.Context {
-	return experimental.WithMemoryAllocator(ctx,
-		experimental.MemoryAllocatorFunc(alloc.Virtual))
-}
-
 type mmapState struct {
 	regions []*MappedRegion
 }

vendor/github.com/ncruces/go-sqlite3/internal/util/mmap_other.go

@@ -1,22 +1,5 @@
-//go:build !unix || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
+//go:build !unix || !(386 || arm || amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
 
 package util
 
-import (
-	"context"
-
-	"github.com/ncruces/go-sqlite3/internal/alloc"
-	"github.com/tetratelabs/wazero/experimental"
-)
-
 type mmapState struct{}
-
-func withAllocator(ctx context.Context) context.Context {
-	return experimental.WithMemoryAllocator(ctx,
-		experimental.MemoryAllocatorFunc(func(cap, max uint64) experimental.LinearMemory {
-			if cap == max {
-				return alloc.Virtual(cap, max)
-			}
-			return alloc.Slice(cap, max)
-		}))
-}

vendor/github.com/ncruces/go-sqlite3/internal/util/module.go

@@ -4,6 +4,8 @@
 	"context"
 
 	"github.com/tetratelabs/wazero/experimental"
+
+	"github.com/ncruces/go-sqlite3/internal/alloc"
 )
 
 type moduleKey struct{}
@@ -14,7 +16,7 @@ type moduleState struct {
 
 func NewContext(ctx context.Context) context.Context {
 	state := new(moduleState)
-	ctx = withAllocator(ctx)
+	ctx = experimental.WithMemoryAllocator(ctx, experimental.MemoryAllocatorFunc(alloc.NewMemory))
 	ctx = experimental.WithCloseNotifier(ctx, state)
 	ctx = context.WithValue(ctx, moduleKey{}, state)
 	return ctx

vendor/github.com/ncruces/go-sqlite3/sqlite.go

@@ -9,11 +9,12 @@
 	"sync"
 	"unsafe"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
-	"github.com/ncruces/go-sqlite3/vfs"
 	"github.com/tetratelabs/wazero"
 	"github.com/tetratelabs/wazero/api"
 	"github.com/tetratelabs/wazero/experimental"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/ncruces/go-sqlite3/vfs"
 )
 
 // Configure SQLite Wasm.
@@ -49,10 +50,15 @@ func compileSQLite() {
 	cfg := RuntimeConfig
 	if cfg == nil {
 		cfg = wazero.NewRuntimeConfig()
+		if bits.UintSize >= 64 {
+			cfg = cfg.WithMemoryLimitPages(4096) // 256MB
+		} else {
+			cfg = cfg.WithMemoryLimitPages(512) // 32MB
+		}
 	}
+	cfg = cfg.WithCoreFeatures(api.CoreFeaturesV2 | experimental.CoreFeaturesThreads)
 
-	instance.runtime = wazero.NewRuntimeWithConfig(ctx,
-		cfg.WithCoreFeatures(api.CoreFeaturesV2|experimental.CoreFeaturesThreads))
+	instance.runtime = wazero.NewRuntimeWithConfig(ctx, cfg)
 
 	env := instance.runtime.NewHostModuleBuilder("env")
 	env = vfs.ExportHostFunctions(env)

vendor/github.com/ncruces/go-sqlite3/txn.go

@@ -8,8 +8,9 @@
 	"strconv"
 	"strings"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
 // Txn is an in-progress database transaction.
@@ -142,7 +143,7 @@ func (c *Conn) Savepoint() Savepoint {
 	// Names can be reused, but this makes catching bugs more likely.
 	name = QuoteIdentifier(name + "_" + strconv.Itoa(int(rand.Int31())))
 
-	err := c.txnExecInterrupted("SAVEPOINT " + name)
+	err := c.txnExecInterrupted(`SAVEPOINT ` + name)
 	if err != nil {
 		panic(err)
 	}
@@ -186,7 +187,7 @@ func (s Savepoint) Release(errp *error) {
 		if s.c.GetAutocommit() { // There is nothing to commit.
 			return
 		}
-		*errp = s.c.Exec("RELEASE " + s.name)
+		*errp = s.c.Exec(`RELEASE ` + s.name)
 		if *errp == nil {
 			return
 		}
@@ -198,8 +199,7 @@ func (s Savepoint) Release(errp *error) {
 		return
 	}
 	// ROLLBACK and RELEASE even if interrupted.
-	err := s.c.txnExecInterrupted("ROLLBACK TO " +
-		s.name + "; RELEASE " + s.name)
+	err := s.c.txnExecInterrupted(`ROLLBACK TO ` + s.name + `; RELEASE ` + s.name)
 	if err != nil {
 		panic(err)
 	}
@@ -212,7 +212,7 @@ func (s Savepoint) Release(errp *error) {
 // https://sqlite.org/lang_transaction.html
 func (s Savepoint) Rollback() error {
 	// ROLLBACK even if interrupted.
-	return s.c.txnExecInterrupted("ROLLBACK TO " + s.name)
+	return s.c.txnExecInterrupted(`ROLLBACK TO ` + s.name)
 }
 
 func (c *Conn) txnExecInterrupted(sql string) error {

vendor/github.com/ncruces/go-sqlite3/util/osutil/osutil.go

@@ -1,2 +1,2 @@
-// Package osutil implements operating system utility functions.
+// Package osutil implements operating system utilities.
 package osutil

vendor/github.com/ncruces/go-sqlite3/util/sql3util/README.md

@@ -0,0 +1,9 @@
+# SQLite utility functions 
+
+This package implements assorted SQLite utilities
+useful to extension writers.
+
+It also wraps a [parser](https://github.com/marcobambini/sqlite-createtable-parser)
+for the [`CREATE`](https://sqlite.org/lang_createtable.html) and
+[`ALTER TABLE`](https://sqlite.org/lang_altertable.html) commands,
+created by [Marco Bambini](https://github.com/marcobambini).

vendor/github.com/ncruces/go-sqlite3/util/sql3util/arg.go

@@ -0,0 +1,65 @@
+package sql3util
+
+import "strings"
+
+// NamedArg splits an named arg into a key and value,
+// around an equals sign.
+// Spaces are trimmed around both key and value.
+func NamedArg(arg string) (key, val string) {
+	key, val, _ = strings.Cut(arg, "=")
+	key = strings.TrimSpace(key)
+	val = strings.TrimSpace(val)
+	return
+}
+
+// Unquote unquotes a string.
+//
+// https://sqlite.org/lang_keywords.html
+func Unquote(val string) string {
+	if len(val) < 2 {
+		return val
+	}
+	fst := val[0]
+	lst := val[len(val)-1]
+	rst := val[1 : len(val)-1]
+	if fst == '[' && lst == ']' {
+		return rst
+	}
+	if fst != lst {
+		return val
+	}
+	var old, new string
+	switch fst {
+	default:
+		return val
+	case '`':
+		old, new = "``", "`"
+	case '"':
+		old, new = `""`, `"`
+	case '\'':
+		old, new = `''`, `'`
+	}
+	return strings.ReplaceAll(rst, old, new)
+}
+
+// ParseBool parses a boolean.
+//
+// https://sqlite.org/pragma.html#syntax
+func ParseBool(s string) (b, ok bool) {
+	if len(s) == 0 {
+		return false, false
+	}
+	if s[0] == '0' {
+		return false, true
+	}
+	if '1' <= s[0] && s[0] <= '9' {
+		return true, true
+	}
+	switch strings.ToLower(s) {
+	case "true", "yes", "on":
+		return true, true
+	case "false", "no", "off":
+		return false, true
+	}
+	return false, false
+}

vendor/github.com/ncruces/go-sqlite3/util/sql3util/const.go

@@ -0,0 +1,61 @@
+package sql3util
+
+const (
+	_NONE = iota
+	_MEMORY
+	_SYNTAX
+	_UNSUPPORTEDSQL
+)
+
+type ConflictClause uint32
+
+const (
+	CONFLICT_NONE ConflictClause = iota
+	CONFLICT_ROLLBACK
+	CONFLICT_ABORT
+	CONFLICT_FAIL
+	CONFLICT_IGNORE
+	CONFLICT_REPLACE
+)
+
+type OrderClause uint32
+
+const (
+	ORDER_NONE OrderClause = iota
+	ORDER_ASC
+	ORDER_DESC
+)
+
+type FKAction uint32
+
+const (
+	FKACTION_NONE FKAction = iota
+	FKACTION_SETNULL
+	FKACTION_SETDEFAULT
+	FKACTION_CASCADE
+	FKACTION_RESTRICT
+	FKACTION_NOACTION
+)
+
+type FKDefType uint32
+
+const (
+	DEFTYPE_NONE FKDefType = iota
+	DEFTYPE_DEFERRABLE
+	DEFTYPE_DEFERRABLE_INITIALLY_DEFERRED
+	DEFTYPE_DEFERRABLE_INITIALLY_IMMEDIATE
+	DEFTYPE_NOTDEFERRABLE
+	DEFTYPE_NOTDEFERRABLE_INITIALLY_DEFERRED
+	DEFTYPE_NOTDEFERRABLE_INITIALLY_IMMEDIATE
+)
+
+type StatementType uint32
+
+const (
+	CREATE_UNKNOWN StatementType = iota
+	CREATE_TABLE
+	ALTER_RENAME_TABLE
+	ALTER_RENAME_COLUMN
+	ALTER_ADD_COLUMN
+	ALTER_DROP_COLUMN
+)

vendor/github.com/ncruces/go-sqlite3/util/sql3util/parse.go

@@ -0,0 +1,210 @@
+package sql3util
+
+import (
+	"context"
+	_ "embed"
+	"sync"
+
+	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+)
+
+const (
+	errp = 4
+	sqlp = 8
+)
+
+var (
+	//go:embed parse/sql3parse_table.wasm
+	binary   []byte
+	once     sync.Once
+	runtime  wazero.Runtime
+	compiled wazero.CompiledModule
+)
+
+// ParseTable parses a [CREATE] or [ALTER TABLE] command.
+//
+// [CREATE]: https://sqlite.org/lang_createtable.html
+// [ALTER TABLE]: https://sqlite.org/lang_altertable.html
+func ParseTable(sql string) (_ *Table, err error) {
+	once.Do(func() {
+		ctx := context.Background()
+		cfg := wazero.NewRuntimeConfigInterpreter()
+		runtime = wazero.NewRuntimeWithConfig(ctx, cfg)
+		compiled, err = runtime.CompileModule(ctx, binary)
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	ctx := context.Background()
+	mod, err := runtime.InstantiateModule(ctx, compiled, wazero.NewModuleConfig().WithName(""))
+	if err != nil {
+		return nil, err
+	}
+	defer mod.Close(ctx)
+
+	if buf, ok := mod.Memory().Read(sqlp, uint32(len(sql))); ok {
+		copy(buf, sql)
+	}
+
+	stack := [...]uint64{sqlp, uint64(len(sql)), errp}
+	err = mod.ExportedFunction("sql3parse_table").CallWithStack(ctx, stack[:])
+	if err != nil {
+		return nil, err
+	}
+
+	c, _ := mod.Memory().ReadUint32Le(errp)
+	switch c {
+	case _MEMORY:
+		panic(util.OOMErr)
+	case _SYNTAX:
+		return nil, util.ErrorString("sql3parse: invalid syntax")
+	case _UNSUPPORTEDSQL:
+		return nil, util.ErrorString("sql3parse: unsupported SQL")
+	}
+
+	var tab Table
+	tab.load(mod, uint32(stack[0]), sql)
+	return &tab, nil
+}
+
+// Table holds metadata about a table.
+type Table struct {
+	Name           string
+	Schema         string
+	Comment        string
+	IsTemporary    bool
+	IsIfNotExists  bool
+	IsWithoutRowID bool
+	IsStrict       bool
+	Columns        []Column
+	Type           StatementType
+	CurrentName    string
+	NewName        string
+}
+
+func (t *Table) load(mod api.Module, ptr uint32, sql string) {
+	t.Name = loadString(mod, ptr+0, sql)
+	t.Schema = loadString(mod, ptr+8, sql)
+	t.Comment = loadString(mod, ptr+16, sql)
+
+	t.IsTemporary = loadBool(mod, ptr+24)
+	t.IsIfNotExists = loadBool(mod, ptr+25)
+	t.IsWithoutRowID = loadBool(mod, ptr+26)
+	t.IsStrict = loadBool(mod, ptr+27)
+
+	t.Columns = loadSlice(mod, ptr+28, func(ptr uint32, res *Column) {
+		p, _ := mod.Memory().ReadUint32Le(ptr)
+		res.load(mod, p, sql)
+	})
+
+	t.Type = loadEnum[StatementType](mod, ptr+44)
+	t.CurrentName = loadString(mod, ptr+48, sql)
+	t.NewName = loadString(mod, ptr+56, sql)
+}
+
+// Column holds metadata about a column.
+type Column struct {
+	Name                  string
+	Type                  string
+	Length                string
+	ConstraintName        string
+	Comment               string
+	IsPrimaryKey          bool
+	IsAutoIncrement       bool
+	IsNotNull             bool
+	IsUnique              bool
+	PKOrder               OrderClause
+	PKConflictClause      ConflictClause
+	NotNullConflictClause ConflictClause
+	UniqueConflictClause  ConflictClause
+	CheckExpr             string
+	DefaultExpr           string
+	CollateName           string
+	ForeignKeyClause      *ForeignKey
+}
+
+func (c *Column) load(mod api.Module, ptr uint32, sql string) {
+	c.Name = loadString(mod, ptr+0, sql)
+	c.Type = loadString(mod, ptr+8, sql)
+	c.Length = loadString(mod, ptr+16, sql)
+	c.ConstraintName = loadString(mod, ptr+24, sql)
+	c.Comment = loadString(mod, ptr+32, sql)
+
+	c.IsPrimaryKey = loadBool(mod, ptr+40)
+	c.IsAutoIncrement = loadBool(mod, ptr+41)
+	c.IsNotNull = loadBool(mod, ptr+42)
+	c.IsUnique = loadBool(mod, ptr+43)
+
+	c.PKOrder = loadEnum[OrderClause](mod, ptr+44)
+	c.PKConflictClause = loadEnum[ConflictClause](mod, ptr+48)
+	c.NotNullConflictClause = loadEnum[ConflictClause](mod, ptr+52)
+	c.UniqueConflictClause = loadEnum[ConflictClause](mod, ptr+56)
+
+	c.CheckExpr = loadString(mod, ptr+60, sql)
+	c.DefaultExpr = loadString(mod, ptr+68, sql)
+	c.CollateName = loadString(mod, ptr+76, sql)
+
+	if ptr, _ := mod.Memory().ReadUint32Le(ptr + 84); ptr != 0 {
+		c.ForeignKeyClause = &ForeignKey{}
+		c.ForeignKeyClause.load(mod, ptr, sql)
+	}
+}
+
+type ForeignKey struct {
+	Table      string
+	Columns    []string
+	OnDelete   FKAction
+	OnUpdate   FKAction
+	Match      string
+	Deferrable FKDefType
+}
+
+func (f *ForeignKey) load(mod api.Module, ptr uint32, sql string) {
+	f.Table = loadString(mod, ptr+0, sql)
+
+	f.Columns = loadSlice(mod, ptr+8, func(ptr uint32, res *string) {
+		*res = loadString(mod, ptr, sql)
+	})
+
+	f.OnDelete = loadEnum[FKAction](mod, ptr+16)
+	f.OnUpdate = loadEnum[FKAction](mod, ptr+20)
+	f.Match = loadString(mod, ptr+24, sql)
+	f.Deferrable = loadEnum[FKDefType](mod, ptr+32)
+}
+
+func loadString(mod api.Module, ptr uint32, sql string) string {
+	off, _ := mod.Memory().ReadUint32Le(ptr + 0)
+	if off == 0 {
+		return ""
+	}
+	len, _ := mod.Memory().ReadUint32Le(ptr + 4)
+	return sql[off-sqlp : off+len-sqlp]
+}
+
+func loadSlice[T any](mod api.Module, ptr uint32, fn func(uint32, *T)) []T {
+	ref, _ := mod.Memory().ReadUint32Le(ptr + 4)
+	if ref == 0 {
+		return nil
+	}
+	len, _ := mod.Memory().ReadUint32Le(ptr + 0)
+	res := make([]T, len)
+	for i := range res {
+		fn(ref, &res[i])
+		ref += 4
+	}
+	return res
+}
+
+func loadEnum[T ~uint32](mod api.Module, ptr uint32) T {
+	val, _ := mod.Memory().ReadUint32Le(ptr)
+	return T(val)
+}
+
+func loadBool(mod api.Module, ptr uint32) bool {
+	val, _ := mod.Memory().ReadByte(ptr)
+	return val != 0
+}

vendor/github.com/ncruces/go-sqlite3/util/sql3util/sql3util.go

@@ -0,0 +1,9 @@
+// Package sql3util implements SQLite utilities.
+package sql3util
+
+// ValidPageSize returns true if s is a valid page size.
+//
+// https://sqlite.org/fileformat.html#pages
+func ValidPageSize(s int) bool {
+	return 512 <= s && s <= 65536 && s&(s-1) == 0
+}

vendor/github.com/ncruces/go-sqlite3/vfs/README.md

@@ -4,7 +4,7 @@ This package implements the SQLite [OS Interface](https://sqlite.org/vfs.html) (
 
 It replaces the default SQLite VFS with a **pure Go** implementation,
 and exposes [interfaces](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs#VFS)
-that should allow you to implement your own custom VFSes.
+that should allow you to implement your own [custom VFSes](#custom-vfses).
 
 Since it is a from scratch reimplementation,
 there are naturally some ways it deviates from the original.
@@ -16,12 +16,12 @@ The main differences are [file locking](#file-locking) and [WAL mode](#write-ahe
 POSIX advisory locks, which SQLite uses on Unix, are
 [broken by design](https://github.com/sqlite/sqlite/blob/b74eb0/src/os_unix.c#L1073-L1161).
 
-On Linux and macOS, this module uses
+On Linux and macOS, this package uses
 [OFD locks](https://www.gnu.org/software/libc/manual/html_node/Open-File-Description-Locks.html)
 to synchronize access to database files.
 OFD locks are fully compatible with POSIX advisory locks.
 
-This module can also use
+This package can also use
 [BSD locks](https://man.freebsd.org/cgi/man.cgi?query=flock&sektion=2),
 albeit with reduced concurrency (`BEGIN IMMEDIATE` behaves like `BEGIN EXCLUSIVE`).
 On BSD, macOS, and illumos, BSD locks are fully compatible with POSIX advisory locks;
@@ -30,7 +30,7 @@ elsewhere, they are very likely broken.
 BSD locks are the default on BSD and illumos,
 but you can opt into them with the `sqlite3_flock` build tag.
 
-On Windows, this module uses `LockFileEx` and `UnlockFileEx`,
+On Windows, this package uses `LockFileEx` and `UnlockFileEx`,
 like SQLite.
 
 Otherwise, file locking is not supported, and you must use
@@ -46,18 +46,14 @@ to check if your build supports file locking.
 
 ### Write-Ahead Logging
 
-On 64-bit little-endian Unix, this module uses `mmap` to implement
+On little-endian Unix, this package uses `mmap` to implement
 [shared-memory for the WAL-index](https://sqlite.org/wal.html#implementation_of_shared_memory_for_the_wal_index),
 like SQLite.
 
-To allow `mmap` to work, each connection needs to reserve up to 4GB of address space.
-To limit the address space each connection reserves,
-use [`WithMemoryLimitPages`](../tests/testcfg/testcfg.go).
-
 With [BSD locks](https://man.freebsd.org/cgi/man.cgi?query=flock&sektion=2)
 a WAL database can only be accessed by a single proccess.
 Other processes that attempt to access a database locked with BSD locks,
-will fail with the `SQLITE_PROTOCOL` error code.
+will fail with the [`SQLITE_PROTOCOL`](https://sqlite.org/rescode.html#protocol) error code.
 
 Otherwise, [WAL support is limited](https://sqlite.org/wal.html#noshm),
 and `EXCLUSIVE` locking mode must be set to create, read, and write WAL databases.
@@ -71,9 +67,22 @@ to check if your build supports shared memory.
 
 ### Batch-Atomic Write
 
-On 64-bit Linux, this module supports [batch-atomic writes](https://sqlite.org/cgi/src/technote/714)
+On 64-bit Linux, this package supports
+[batch-atomic writes](https://sqlite.org/cgi/src/technote/714)
 on the F2FS filesystem.
 
+### Checksums
+
+This package can be [configured](https://pkg.go.dev/github.com/ncruces/go-sqlite3#Conn.EnableChecksums)
+to add an 8-byte checksum to the end of every page in an SQLite database.
+The checksum is added as each page is written
+and verified as each page is read.\
+The checksum is intended to help detect database corruption
+caused by random bit-flips in the mass storage device.
+
+The implementation is compatible with SQLite's
+[Checksum VFS Shim](https://sqlite.org/cksumvfs.html).
+
 ### Build Tags
 
 The VFS can be customized with a few build tags:
@@ -90,3 +99,14 @@ The VFS can be customized with a few build tags:
 > [`unix-flock` VFS](https://sqlite.org/compile.html#enable_locking_style).
 > If incompatible file locking is used, accessing databases concurrently with
 > _other_ SQLite libraries will eventually corrupt data.
+
+### Custom VFSes
+
+- [`github.com/ncruces/go-sqlite3/vfs/adiantum`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/adiantum)
+  wraps a VFS to offer encryption at rest.
+- [`github.com/ncruces/go-sqlite3/vfs/memdb`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/memdb)
+  implements an in-memory VFS.
+- [`github.com/ncruces/go-sqlite3/vfs/readervfs`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/readervfs)
+  implements a VFS for immutable databases.
+- [`github.com/ncruces/go-sqlite3/vfs/xts`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/xts)
+  wraps a VFS to offer encryption at rest.

vendor/github.com/ncruces/go-sqlite3/vfs/api.go

@@ -49,6 +49,13 @@ type File interface {
 	DeviceCharacteristics() DeviceCharacteristic
 }
 
+// FileUnwrap should be implemented by a File
+// that wraps another File implementation.
+type FileUnwrap interface {
+	File
+	Unwrap() File
+}
+
 // FileLockState extends File to implement the
 // SQLITE_FCNTL_LOCKSTATE file control opcode.
 //
@@ -58,6 +65,26 @@ type FileLockState interface {
 	LockState() LockLevel
 }
 
+// FilePersistentWAL extends File to implement the
+// SQLITE_FCNTL_PERSIST_WAL file control opcode.
+//
+// https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpersistwal
+type FilePersistentWAL interface {
+	File
+	PersistentWAL() bool
+	SetPersistentWAL(bool)
+}
+
+// FilePowersafeOverwrite extends File to implement the
+// SQLITE_FCNTL_POWERSAFE_OVERWRITE file control opcode.
+//
+// https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpowersafeoverwrite
+type FilePowersafeOverwrite interface {
+	File
+	PowersafeOverwrite() bool
+	SetPowersafeOverwrite(bool)
+}
+
 // FileChunkSize extends File to implement the
 // SQLITE_FCNTL_CHUNK_SIZE file control opcode.
 //
@@ -94,26 +121,6 @@ type FileOverwrite interface {
 	Overwrite() error
 }
 
-// FilePersistentWAL extends File to implement the
-// SQLITE_FCNTL_PERSIST_WAL file control opcode.
-//
-// https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpersistwal
-type FilePersistentWAL interface {
-	File
-	PersistentWAL() bool
-	SetPersistentWAL(bool)
-}
-
-// FilePowersafeOverwrite extends File to implement the
-// SQLITE_FCNTL_POWERSAFE_OVERWRITE file control opcode.
-//
-// https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpowersafeoverwrite
-type FilePowersafeOverwrite interface {
-	File
-	PowersafeOverwrite() bool
-	SetPowersafeOverwrite(bool)
-}
-
 // FileCommitPhaseTwo extends File to implement the
 // SQLITE_FCNTL_COMMIT_PHASETWO file control opcode.
 //
@@ -135,15 +142,6 @@ type FileBatchAtomicWrite interface {
 	RollbackAtomicWrite() error
 }
 
-// FilePragma extends File to implement the
-// SQLITE_FCNTL_PRAGMA file control opcode.
-//
-// https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpragma
-type FilePragma interface {
-	File
-	Pragma(name, value string) (string, error)
-}
-
 // FileCheckpoint extends File to implement the
 // SQLITE_FCNTL_CKPT_START and SQLITE_FCNTL_CKPT_DONE
 // file control opcodes.
@@ -151,8 +149,17 @@ type FilePragma interface {
 // https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlckptstart
 type FileCheckpoint interface {
 	File
-	CheckpointDone() error
-	CheckpointStart() error
+	CheckpointStart()
+	CheckpointDone()
+}
+
+// FilePragma extends File to implement the
+// SQLITE_FCNTL_PRAGMA file control opcode.
+//
+// https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpragma
+type FilePragma interface {
+	File
+	Pragma(name, value string) (string, error)
 }
 
 // FileSharedMemory extends File to possibly implement
@@ -171,5 +178,16 @@ type SharedMemory interface {
 	shmMap(context.Context, api.Module, int32, int32, bool) (uint32, _ErrorCode)
 	shmLock(int32, int32, _ShmFlag) _ErrorCode
 	shmUnmap(bool)
+	shmBarrier()
 	io.Closer
 }
+
+type blockingSharedMemory interface {
+	SharedMemory
+	shmEnableBlocking(block bool)
+}
+
+type fileControl interface {
+	File
+	fileControl(ctx context.Context, mod api.Module, op _FcntlOpcode, pArg uint32) _ErrorCode
+}

vendor/github.com/ncruces/go-sqlite3/vfs/cksm.go

@@ -0,0 +1,149 @@
+package vfs
+
+import (
+	"bytes"
+	"context"
+	_ "embed"
+	"encoding/binary"
+	"strconv"
+
+	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/ncruces/go-sqlite3/util/sql3util"
+)
+
+func cksmWrapFile(name *Filename, flags OpenFlag, file File) File {
+	// Checksum only main databases and WALs.
+	if flags&(OPEN_MAIN_DB|OPEN_WAL) == 0 {
+		return file
+	}
+
+	cksm := cksmFile{File: file}
+
+	if flags&OPEN_WAL != 0 {
+		main, _ := name.DatabaseFile().(cksmFile)
+		cksm.cksmFlags = main.cksmFlags
+	} else {
+		cksm.cksmFlags = new(cksmFlags)
+		cksm.isDB = true
+	}
+
+	return cksm
+}
+
+type cksmFile struct {
+	File
+	*cksmFlags
+	isDB bool
+}
+
+type cksmFlags struct {
+	computeCksm bool
+	verifyCksm  bool
+	inCkpt      bool
+	pageSize    int
+}
+
+func (c cksmFile) ReadAt(p []byte, off int64) (n int, err error) {
+	n, err = c.File.ReadAt(p, off)
+
+	// SQLite is reading the header of a database file.
+	if c.isDB && off == 0 && len(p) >= 100 &&
+		bytes.HasPrefix(p, []byte("SQLite format 3\000")) {
+		c.init(p)
+	}
+
+	// Verify checksums.
+	if c.verifyCksm && !c.inCkpt && len(p) == c.pageSize {
+		cksm1 := cksmCompute(p[:len(p)-8])
+		cksm2 := *(*[8]byte)(p[len(p)-8:])
+		if cksm1 != cksm2 {
+			return 0, _IOERR_DATA
+		}
+	}
+	return n, err
+}
+
+func (c cksmFile) WriteAt(p []byte, off int64) (n int, err error) {
+	// SQLite is writing the first page of a database file.
+	if c.isDB && off == 0 && len(p) >= 100 &&
+		bytes.HasPrefix(p, []byte("SQLite format 3\000")) {
+		c.init(p)
+	}
+
+	// Compute checksums.
+	if c.computeCksm && !c.inCkpt && len(p) == c.pageSize {
+		*(*[8]byte)(p[len(p)-8:]) = cksmCompute(p[:len(p)-8])
+	}
+
+	return c.File.WriteAt(p, off)
+}
+
+func (c cksmFile) Pragma(name string, value string) (string, error) {
+	switch name {
+	case "checksum_verification":
+		b, ok := sql3util.ParseBool(value)
+		if ok {
+			c.verifyCksm = b && c.computeCksm
+		}
+		if !c.verifyCksm {
+			return "0", nil
+		}
+		return "1", nil
+
+	case "page_size":
+		if c.computeCksm {
+			// Do not allow page size changes on a checksum database.
+			return strconv.Itoa(c.pageSize), nil
+		}
+	}
+	return "", _NOTFOUND
+}
+
+func (c cksmFile) fileControl(ctx context.Context, mod api.Module, op _FcntlOpcode, pArg uint32) _ErrorCode {
+	switch op {
+	case _FCNTL_CKPT_START:
+		c.inCkpt = true
+	case _FCNTL_CKPT_DONE:
+		c.inCkpt = false
+	}
+	if rc := vfsFileControlImpl(ctx, mod, c, op, pArg); rc != _NOTFOUND {
+		return rc
+	}
+	return vfsFileControlImpl(ctx, mod, c.File, op, pArg)
+}
+
+func (f *cksmFlags) init(header []byte) {
+	f.pageSize = 256 * int(binary.LittleEndian.Uint16(header[16:18]))
+	if r := header[20] == 8; r != f.computeCksm {
+		f.computeCksm = r
+		f.verifyCksm = r
+	}
+}
+
+func cksmCompute(a []byte) (cksm [8]byte) {
+	var s1, s2 uint32
+	for len(a) >= 8 {
+		s1 += binary.LittleEndian.Uint32(a[0:4]) + s2
+		s2 += binary.LittleEndian.Uint32(a[4:8]) + s1
+		a = a[8:]
+	}
+	if len(a) != 0 {
+		panic(util.AssertErr())
+	}
+	binary.LittleEndian.PutUint32(cksm[0:4], s1)
+	binary.LittleEndian.PutUint32(cksm[4:8], s2)
+	return
+}
+
+func (c cksmFile) SharedMemory() SharedMemory {
+	if f, ok := c.File.(FileSharedMemory); ok {
+		return f.SharedMemory()
+	}
+	return nil
+}
+
+func (c cksmFile) Unwrap() File {
+	return c.File
+}

vendor/github.com/ncruces/go-sqlite3/vfs/const.go

@@ -51,6 +51,7 @@ func (e _ErrorCode) Error() string {
 	_IOERR_BEGIN_ATOMIC      _ErrorCode = util.IOERR_BEGIN_ATOMIC
 	_IOERR_COMMIT_ATOMIC     _ErrorCode = util.IOERR_COMMIT_ATOMIC
 	_IOERR_ROLLBACK_ATOMIC   _ErrorCode = util.IOERR_ROLLBACK_ATOMIC
+	_IOERR_DATA              _ErrorCode = util.IOERR_DATA
 	_BUSY_SNAPSHOT           _ErrorCode = util.BUSY_SNAPSHOT
 	_CANTOPEN_FULLPATH       _ErrorCode = util.CANTOPEN_FULLPATH
 	_CANTOPEN_ISDIR          _ErrorCode = util.CANTOPEN_ISDIR

vendor/github.com/ncruces/go-sqlite3/vfs/filename.go

@@ -4,8 +4,9 @@
 	"context"
 	"net/url"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
 // Filename is used by SQLite to pass filenames

vendor/github.com/ncruces/go-sqlite3/vfs/os_f2fs_linux.go

@@ -1,4 +1,4 @@
-//go:build (amd64 || arm64 || riscv64 || ppc64le) && !sqlite3_nosys
+//go:build (amd64 || arm64 || riscv64) && !sqlite3_nosys
 
 package vfs
 
@@ -13,7 +13,7 @@
 	_F2FS_IOC_START_ATOMIC_WRITE  = 62721
 	_F2FS_IOC_COMMIT_ATOMIC_WRITE = 62722
 	_F2FS_IOC_ABORT_ATOMIC_WRITE  = 62725
-	_F2FS_IOC_GET_FEATURES        = 2147808524
+	_F2FS_IOC_GET_FEATURES        = 2147808524 // -2147158772
 	_F2FS_FEATURE_ATOMIC_WRITE    = 4
 )
 

vendor/github.com/ncruces/go-sqlite3/vfs/os_std_atomic.go

@@ -1,4 +1,4 @@
-//go:build !linux || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_nosys
+//go:build !linux || !(amd64 || arm64 || riscv64) || sqlite3_nosys
 
 package vfs
 

vendor/github.com/ncruces/go-sqlite3/vfs/shm.go

@@ -1,4 +1,4 @@
-//go:build (darwin || linux) && (amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_flock || sqlite3_noshm || sqlite3_nosys)
+//go:build (darwin || linux) && (386 || arm || amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_flock || sqlite3_noshm || sqlite3_nosys)
 
 package vfs
 
@@ -6,11 +6,13 @@
 	"context"
 	"io"
 	"os"
+	"sync"
 	"time"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
 	"golang.org/x/sys/unix"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
 // SupportsSharedMemory is false on platforms that do not support shared memory.
@@ -45,12 +47,15 @@ func NewSharedMemory(path string, flags OpenFlag) SharedMemory {
 	}
 }
 
+var _ blockingSharedMemory = &vfsShm{}
+
 type vfsShm struct {
 	*os.File
 	path     string
 	regions  []*util.MappedRegion
 	readOnly bool
 	blocking bool
+	sync.Mutex
 }
 
 func (s *vfsShm) shmOpen() _ErrorCode {
@@ -196,6 +201,12 @@ func (s *vfsShm) shmUnmap(delete bool) {
 	s.File = nil
 }
 
+func (s *vfsShm) shmBarrier() {
+	s.Lock()
+	//lint:ignore SA2001 memory barrier.
+	s.Unlock()
+}
+
 func (s *vfsShm) shmEnableBlocking(block bool) {
 	s.blocking = block
 }

vendor/github.com/ncruces/go-sqlite3/vfs/shm_bsd.go

@@ -1,4 +1,4 @@
-//go:build (freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && (amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_noshm || sqlite3_nosys)
+//go:build (freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && (386 || arm || amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_noshm || sqlite3_nosys)
 
 package vfs
 
@@ -8,9 +8,10 @@
 	"os"
 	"sync"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
 	"golang.org/x/sys/unix"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
 // SupportsSharedMemory is false on platforms that do not support shared memory.
@@ -269,3 +270,9 @@ func (s *vfsShm) shmUnmap(delete bool) {
 	}
 	s.Close()
 }
+
+func (s *vfsShm) shmBarrier() {
+	s.lockMtx.Lock()
+	//lint:ignore SA2001 memory barrier.
+	s.lockMtx.Unlock()
+}

vendor/github.com/ncruces/go-sqlite3/vfs/shm_other.go

@@ -1,4 +1,4 @@
-//go:build !(darwin || linux || freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
+//go:build !(darwin || linux || freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) || !(386 || arm || amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
 
 package vfs
 

vendor/github.com/ncruces/go-sqlite3/vfs/vfs.go

@@ -5,13 +5,15 @@
 	"crypto/rand"
 	"io"
 	"reflect"
-	"sync"
+	"strings"
 	"time"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
-	"github.com/ncruces/julianday"
 	"github.com/tetratelabs/wazero"
 	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/ncruces/go-sqlite3/util/sql3util"
+	"github.com/ncruces/julianday"
 )
 
 // ExportHostFunctions is an internal API users need not call directly.
@@ -146,7 +148,7 @@ func vfsOpen(ctx context.Context, mod api.Module, pVfs, zPath, pFile uint32, fla
 	}
 
 	if file, ok := file.(FilePowersafeOverwrite); ok {
-		if b, ok := util.ParseBool(name.URIParameter("psow")); ok {
+		if b, ok := sql3util.ParseBool(name.URIParameter("psow")); ok {
 			file.SetPowersafeOverwrite(b)
 		}
 	}
@@ -157,6 +159,7 @@ func vfsOpen(ctx context.Context, mod api.Module, pVfs, zPath, pFile uint32, fla
 	if pOutFlags != 0 {
 		util.WriteUint32(mod, pOutFlags, uint32(flags))
 	}
+	file = cksmWrapFile(name, flags, file)
 	vfsFileRegister(ctx, mod, pFile, file)
 	return _OK
 }
@@ -235,20 +238,19 @@ func vfsCheckReservedLock(ctx context.Context, mod api.Module, pFile, pResOut ui
 
 func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _FcntlOpcode, pArg uint32) _ErrorCode {
 	file := vfsFileGet(ctx, mod, pFile).(File)
+	if file, ok := file.(fileControl); ok {
+		return file.fileControl(ctx, mod, op, pArg)
+	}
+	return vfsFileControlImpl(ctx, mod, file, op, pArg)
+}
 
+func vfsFileControlImpl(ctx context.Context, mod api.Module, file File, op _FcntlOpcode, pArg uint32) _ErrorCode {
 	switch op {
 	case _FCNTL_LOCKSTATE:
 		if file, ok := file.(FileLockState); ok {
-			util.WriteUint32(mod, pArg, uint32(file.LockState()))
-			return _OK
-		}
-
-	case _FCNTL_LOCK_TIMEOUT:
-		if file, ok := file.(FileSharedMemory); ok {
-			if iface, ok := file.SharedMemory().(interface{ shmEnableBlocking(bool) }); ok {
-				if i := util.ReadUint32(mod, pArg); i == 0 || i == 1 {
-					iface.shmEnableBlocking(i != 0)
-				}
+			if lk := file.LockState(); lk <= LOCK_EXCLUSIVE {
+				util.WriteUint32(mod, pArg, uint32(lk))
+				return _OK
 			}
 		}
 
@@ -329,15 +331,15 @@ func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _Fcntl
 			return vfsErrorCode(err, _IOERR_ROLLBACK_ATOMIC)
 		}
 
-	case _FCNTL_CKPT_DONE:
-		if file, ok := file.(FileCheckpoint); ok {
-			err := file.CheckpointDone()
-			return vfsErrorCode(err, _IOERR)
-		}
 	case _FCNTL_CKPT_START:
 		if file, ok := file.(FileCheckpoint); ok {
-			err := file.CheckpointStart()
-			return vfsErrorCode(err, _IOERR)
+			file.CheckpointStart()
+			return _OK
+		}
+	case _FCNTL_CKPT_DONE:
+		if file, ok := file.(FileCheckpoint); ok {
+			file.CheckpointDone()
+			return _OK
 		}
 
 	case _FCNTL_PRAGMA:
@@ -349,7 +351,7 @@ func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _Fcntl
 				value = util.ReadString(mod, ptr, _MAX_SQL_LENGTH)
 			}
 
-			out, err := file.Pragma(name, value)
+			out, err := file.Pragma(strings.ToLower(name), value)
 
 			ret := vfsErrorCode(err, _ERROR)
 			if ret == _ERROR {
@@ -366,6 +368,14 @@ func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _Fcntl
 			}
 			return ret
 		}
+
+	case _FCNTL_LOCK_TIMEOUT:
+		if file, ok := file.(FileSharedMemory); ok {
+			if shm, ok := file.SharedMemory().(blockingSharedMemory); ok {
+				shm.shmEnableBlocking(util.ReadUint32(mod, pArg) != 0)
+				return _OK
+			}
+		}
 	}
 
 	// Consider also implementing these opcodes (in use by SQLite):
@@ -385,11 +395,9 @@ func vfsDeviceCharacteristics(ctx context.Context, mod api.Module, pFile uint32)
 	return file.DeviceCharacteristics()
 }
 
-var shmBarrier sync.Mutex
-
 func vfsShmBarrier(ctx context.Context, mod api.Module, pFile uint32) {
-	shmBarrier.Lock()
-	defer shmBarrier.Unlock()
+	shm := vfsFileGet(ctx, mod, pFile).(FileSharedMemory).SharedMemory()
+	shm.shmBarrier()
 }
 
 func vfsShmMap(ctx context.Context, mod api.Module, pFile uint32, iRegion, szRegion int32, bExtend, pp uint32) _ErrorCode {

vendor/github.com/ncruces/go-sqlite3/vtab.go

@@ -4,8 +4,9 @@
 	"context"
 	"reflect"
 
-	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
 // CreateModule registers a new virtual table module name.

vendor/modules.txt

@@ -518,7 +518,7 @@ github.com/modern-go/reflect2
 # github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822
 ## explicit
 github.com/munnerz/goautoneg
-# github.com/ncruces/go-sqlite3 v0.19.0
+# github.com/ncruces/go-sqlite3 v0.20.0
 ## explicit; go 1.21
 github.com/ncruces/go-sqlite3
 github.com/ncruces/go-sqlite3/driver
@@ -526,6 +526,7 @@ github.com/ncruces/go-sqlite3/embed
 github.com/ncruces/go-sqlite3/internal/alloc
 github.com/ncruces/go-sqlite3/internal/util
 github.com/ncruces/go-sqlite3/util/osutil
+github.com/ncruces/go-sqlite3/util/sql3util
 github.com/ncruces/go-sqlite3/vfs
 github.com/ncruces/go-sqlite3/vfs/memdb
 # github.com/ncruces/go-strftime v0.1.9

web/source/settings/lib/types/instance.ts

@@ -25,6 +25,7 @@ export interface InstanceV1 {
     description_text?:       string;
     short_description:      string;
     short_description_text?: string;
+    custom_css:             string;
     email:                  string;
     version:                string;
     debug?:                 boolean;

web/source/settings/views/admin/instance/settings.tsx

@@ -46,7 +46,7 @@ function InstanceSettingsForm({ data: instance }: InstanceSettingsFormProps) {
 	const shortDescLimit = 500;
 	const descLimit = 5000;
 	const termsLimit = 5000;
-	
+
 	const form = {
 		title: useTextInput("title", {
 			source: instance,
@@ -66,6 +66,10 @@ function InstanceSettingsForm({ data: instance }: InstanceSettingsFormProps) {
 			valueSelector: (s: InstanceV1) => s.description_text,
 			validator: (val: string) => val.length <= descLimit ? "" : `Instance description is ${val.length} characters; must be ${descLimit} characters or less`
 		}),
+		customCSS: useTextInput("custom_css", {
+			source: instance,
+			valueSelector: (s: InstanceV1) => s.custom_css
+		}),
 		terms: useTextInput("terms", {
 			source: instance,
 			// Select "raw" text version of parsed field for editing.
@@ -191,7 +195,16 @@ function InstanceSettingsForm({ data: instance }: InstanceSettingsFormProps) {
 				type="email"
 			/>
 
+			<TextArea
+				field={form.customCSS}
+				label={"Custom CSS"}
+				className="monospace"
+				rows={8}
+				autoCapitalize="none"
+				spellCheck="false"
+			/>
+
 			<MutationButton label="Save" result={result} disabled={false} />
 		</form>
 	);
-}
+}