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Implement "embedded" command to extract static resources (#9982)

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* draft

* Implement extract command

* Fix nits and force args on extract

* Add !bindata stub, support Windows, fmt

* fix vendored flag

* Remove leading slash for matching

* Add docs

* Fix typos

* Add embedded view command

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
guillep2k 2020-02-01 23:17:44 -03:00 committed by GitHub
parent 9b9dd19d7d
commit bcb52aef09
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8 changed files with 568 additions and 6 deletions
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332
cmd/embedded.go Normal file
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@ -0,0 +1,332 @@
// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// +build bindata
package cmd
import (
"errors"
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/options"
"code.gitea.io/gitea/modules/public"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/templates"
"github.com/gobwas/glob"
"github.com/urfave/cli"
)
// Cmdembedded represents the available extract sub-command.
var (
Cmdembedded = cli.Command{
Name: "embedded",
Usage: "Extract embedded resources",
Description: "A command for extracting embedded resources, like templates and images",
Subcommands: []cli.Command{
subcmdList,
subcmdView,
subcmdExtract,
},
}
subcmdList = cli.Command{
Name: "list",
Usage: "List files matching the given pattern",
Action: runList,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "include-vendored,vendor",
Usage: "Include files under public/vendor as well",
},
},
}
subcmdView = cli.Command{
Name: "view",
Usage: "View a file matching the given pattern",
Action: runView,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "include-vendored,vendor",
Usage: "Include files under public/vendor as well",
},
},
}
subcmdExtract = cli.Command{
Name: "extract",
Usage: "Extract resources",
Action: runExtract,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "include-vendored,vendor",
Usage: "Include files under public/vendor as well",
},
cli.BoolFlag{
Name: "overwrite",
Usage: "Overwrite files if they already exist",
},
cli.BoolFlag{
Name: "rename",
Usage: "Rename files as {name}.bak if they already exist (overwrites previous .bak)",
},
cli.BoolFlag{
Name: "custom",
Usage: "Extract to the 'custom' directory as per app.ini",
},
cli.StringFlag{
Name: "destination,dest-dir",
Usage: "Extract to the specified directory",
},
},
}
sections map[string]*section
assets []asset
)
type section struct {
Path string
Names func() []string
IsDir func(string) (bool, error)
Asset func(string) ([]byte, error)
}
type asset struct {
Section *section
Name string
Path string
}
func initEmbeddedExtractor(c *cli.Context) error {
// Silence the console logger
log.DelNamedLogger("console")
log.DelNamedLogger(log.DEFAULT)
// Read configuration file
setting.NewContext()
pats, err := getPatterns(c.Args())
if err != nil {
return err
}
sections := make(map[string]*section, 3)
sections["public"] = &section{Path: "public", Names: public.AssetNames, IsDir: public.AssetIsDir, Asset: public.Asset}
sections["options"] = &section{Path: "options", Names: options.AssetNames, IsDir: options.AssetIsDir, Asset: options.Asset}
sections["templates"] = &section{Path: "templates", Names: templates.AssetNames, IsDir: templates.AssetIsDir, Asset: templates.Asset}
for _, sec := range sections {
assets = append(assets, buildAssetList(sec, pats, c)...)
}
// Sort assets
sort.SliceStable(assets, func(i, j int) bool {
return assets[i].Path < assets[j].Path
})
return nil
}
func runList(c *cli.Context) error {
if err := runListDo(c); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return err
}
return nil
}
func runView(c *cli.Context) error {
if err := runViewDo(c); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return err
}
return nil
}
func runExtract(c *cli.Context) error {
if err := runExtractDo(c); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return err
}
return nil
}
func runListDo(c *cli.Context) error {
if err := initEmbeddedExtractor(c); err != nil {
return err
}
for _, a := range assets {
fmt.Println(a.Path)
}
return nil
}
func runViewDo(c *cli.Context) error {
if err := initEmbeddedExtractor(c); err != nil {
return err
}
if len(assets) == 0 {
return fmt.Errorf("No files matched the given pattern")
} else if len(assets) > 1 {
return fmt.Errorf("Too many files matched the given pattern; try to be more specific")
}
data, err := assets[0].Section.Asset(assets[0].Name)
if err != nil {
return fmt.Errorf("%s: %v", assets[0].Path, err)
}
if _, err = os.Stdout.Write(data); err != nil {
return fmt.Errorf("%s: %v", assets[0].Path, err)
}
return nil
}
func runExtractDo(c *cli.Context) error {
if err := initEmbeddedExtractor(c); err != nil {
return err
}
if len(c.Args()) == 0 {
return fmt.Errorf("A list of pattern of files to extract is mandatory (e.g. '**' for all)")
}
destdir := "."
if c.IsSet("destination") {
destdir = c.String("destination")
} else if c.Bool("custom") {
destdir = setting.CustomPath
fmt.Println("Using app.ini at", setting.CustomConf)
}
fi, err := os.Stat(destdir)
if errors.Is(err, os.ErrNotExist) {
// In case Windows users attempt to provide a forward-slash path
wdestdir := filepath.FromSlash(destdir)
if wfi, werr := os.Stat(wdestdir); werr == nil {
destdir = wdestdir
fi = wfi
err = nil
}
}
if err != nil {
return fmt.Errorf("%s: %s", destdir, err)
} else if !fi.IsDir() {
return fmt.Errorf("%s is not a directory.", destdir)
}
fmt.Printf("Extracting to %s:\n", destdir)
overwrite := c.Bool("overwrite")
rename := c.Bool("rename")
for _, a := range assets {
if err := extractAsset(destdir, a, overwrite, rename); err != nil {
// Non-fatal error
fmt.Fprintf(os.Stderr, "%s: %v", a.Path, err)
}
}
return nil
}
func extractAsset(d string, a asset, overwrite, rename bool) error {
dest := filepath.Join(d, filepath.FromSlash(a.Path))
dir := filepath.Dir(dest)
data, err := a.Section.Asset(a.Name)
if err != nil {
return fmt.Errorf("%s: %v", a.Path, err)
}
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return fmt.Errorf("%s: %v", dir, err)
}
perms := os.ModePerm & 0666
fi, err := os.Lstat(dest)
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return fmt.Errorf("%s: %v", dest, err)
}
} else if !overwrite && !rename {
fmt.Printf("%s already exists; skipped.\n", dest)
return nil
} else if !fi.Mode().IsRegular() {
return fmt.Errorf("%s already exists, but it's not a regular file", dest)
} else if rename {
if err := os.Rename(dest, dest+".bak"); err != nil {
return fmt.Errorf("Error creating backup for %s: %v", dest, err)
}
// Attempt to respect file permissions mask (even if user:group will be set anew)
perms = fi.Mode()
}
file, err := os.OpenFile(dest, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, perms)
if err != nil {
return fmt.Errorf("%s: %v", dest, err)
}
defer file.Close()
if _, err = file.Write(data); err != nil {
return fmt.Errorf("%s: %v", dest, err)
}
fmt.Println(dest)
return nil
}
func buildAssetList(sec *section, globs []glob.Glob, c *cli.Context) []asset {
var results = make([]asset, 0, 64)
for _, name := range sec.Names() {
if isdir, err := sec.IsDir(name); !isdir && err == nil {
if sec.Path == "public" &&
strings.HasPrefix(name, "vendor/") &&
!c.Bool("include-vendored") {
continue
}
matchName := sec.Path + "/" + name
for _, g := range globs {
if g.Match(matchName) {
results = append(results, asset{Section: sec,
Name: name,
Path: sec.Path + "/" + name})
break
}
}
}
}
return results
}
func getPatterns(args []string) ([]glob.Glob, error) {
if len(args) == 0 {
args = []string{"**"}
}
pat := make([]glob.Glob, len(args))
for i := range args {
if g, err := glob.Compile(args[i], '/'); err != nil {
return nil, fmt.Errorf("'%s': Invalid glob pattern: %v", args[i], err)
} else {
pat[i] = g
}
}
return pat, nil
}

30
cmd/embedded_stub.go Normal file
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@ -0,0 +1,30 @@
// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// +build !bindata
package cmd
import (
"fmt"
"os"
"github.com/urfave/cli"
)
// Cmdembedded represents the available extract sub-command.
var (
Cmdembedded = cli.Command{
Name: "embedded",
Usage: "Extract embedded resources",
Description: "A command for extracting embedded resources, like templates and images",
Action: extractorNotImplemented,
}
)
func extractorNotImplemented(c *cli.Context) error {
err := fmt.Errorf("Sorry: the 'embedded' subcommand is not available in builds without bindata")
fmt.Fprintf(os.Stderr, "%s\n", err)
return err
}

115
docs/content/doc/advanced/cmd-embedded.en-us.md Normal file
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---
date: "2020-01-25T21:00:00-03:00"
title: "Embedded data extraction tool"
slug: "cmd-embedded"
weight: 40
toc: true
draft: false
menu:
sidebar:
parent: "advanced"
name: "Embedded data extraction tool"
weight: 40
identifier: "cmd-embedded"
---
# Embedded data extraction tool
Gitea's executable contains all the resources required to run: templates, images, style-sheets
and translations. Any of them can be overridden by placing a replacement in a matching path
inside the `custom` directory (see [Customizing Gitea]({{< relref "doc/advanced/customizing-gitea.en-us.md" >}})).
To obtain a copy of the embedded resources ready for editing, the `embedded` command from the CLI
can be used from the OS shell interface.
## Listing resources
To list resources embedded in Gitea's executable, use the following syntax:
```
gitea embedded list [--include-vendored] [patterns...]
```
The `--include-vendored` flag makes the command include vendored files, which are
normally excluded; that is, files from external libraries that are required for Gitea
(e.g. [font-awesome](https://fontawesome.com/), [octicons](https://octicons.github.com/), etc).
A list of file search patterns can be provided. Gitea uses [gobwas/glob](https://github.com/gobwas/glob)
for its glob syntax. Here are some examples:
- List all template files, in any virtual directory: `**.tmpl`
- List all mail template files: `templates/mail/**.tmpl`
- List all files inside `public/img`: `public/img/**`
Don't forget to use quotes for the patterns, as spaces, `*` and other characters might have
a special meaning for your command shell.
If no pattern is provided, all files are listed.
#### Example
Listing all embedded files with `openid` in their path:
```
$ gitea embedded list '**openid**'
public/img/auth/openid_connect.png
public/img/openid-16x16.png
templates/user/auth/finalize_openid.tmpl
templates/user/auth/signin_openid.tmpl
templates/user/auth/signup_openid_connect.tmpl
templates/user/auth/signup_openid_navbar.tmpl
templates/user/auth/signup_openid_register.tmpl
templates/user/settings/security_openid.tmpl
```
## Extracting resources
To extract resources embedded in Gitea's executable, use the following syntax:
```
gitea [--config {file}] embedded extract [--destination {dir}|--custom] [--overwrite|--rename] [--include-vendored] {patterns...}
```
The `--config` option tells gitea the location of the `app.ini` configuration file if
it's not in its default location. This option is only used with the `--custom` flag.
The `--destination` option tells gitea the directory where the files must be extracted to.
The default is the current directory.
The `--custom` flag tells gitea to extract the files directly into the `custom` directory.
For this to work, the command needs to know the location of the `app.ini` configuration
file (`--config`) and, depending of the configuration, be ran from the directory where
gitea normally starts. See [Customizing Gitea]({{< relref "doc/advanced/customizing-gitea.en-us.md" >}}) for details.
The `--overwrite` flag allows any existing files in the destination directory to be overwritten.
The `--rename` flag tells gitea to rename any existing files in the destination directory
as `filename.bak`. Previous `.bak` files are overwritten.
At least one file search pattern must be provided; see `list` subcomand above for pattern
syntax and examples.
#### Important notice
Make sure to **only extract those files that require customization**. Files that
are present in the `custom` directory are not upgraded by Gitea's upgrade process.
When Gitea is upgraded to a new version (by replacing the executable), many of the
embedded files will suffer changes. Gitea will honor and use any files found
in the `custom` directory, even if they are old and incompatible.
#### Example
Extracting mail templates to a temporary directory:
```
$ mkdir tempdir
$ gitea embedded extract --destination tempdir 'templates/mail/**.tmpl'
Extracting to tempdir:
tempdir/templates/mail/auth/activate.tmpl
tempdir/templates/mail/auth/activate_email.tmpl
tempdir/templates/mail/auth/register_notify.tmpl
tempdir/templates/mail/auth/reset_passwd.tmpl
tempdir/templates/mail/issue/assigned.tmpl
tempdir/templates/mail/issue/default.tmpl
tempdir/templates/mail/notify/collaborator.tmpl
```

19
docs/content/doc/advanced/customizing-gitea.en-us.md
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@ -57,14 +57,21 @@ the url `http://gitea.domain.tld/image.png`.
Place the png image at the following path: `custom/public/img/avatar_default.png`
## Customizing Gitea pages
## Customizing Gitea pages and resources
The `custom/templates` folder allows changing every single page of Gitea. Templates
to override can be found in the [`templates`](https://github.com/go-gitea/gitea/tree/master/templates) directory of Gitea source (Note: the example link is from `master` branch. Make sure to copy templates from same release you are using). Override by
making a copy of the file under `custom/templates` using a full path structure
matching source.
Gitea's executable contains all the resources required to run: templates, images, style-sheets
and translations. Any of them can be overridden by placing a replacement in a matching path
inside the `custom` directory. For example, to replace the default `.gitignore` provided
for C++ repositories, we want to replace `options/gitignore/C++`. To do this, a replacement
must be placed in `custom/options/gitignore/C++` (see about the location of the `custom`
directory at the top of this document).
Any statement contained inside `{{` and `}}` are Gitea's template syntax and
Every single page of Gitea can be changed. Dynamic content is generated using [go templates](https://golang.org/pkg/html/template/),
which can be modified by placing replacements below the `custom/templates` directory.
To obtain any embedded file (including templates), the [`gitea embedded` tool]({{< relref "doc/advanced/cmd-embedded.en-us.md" >}}) can be used. Alternatively, they can be found in the [`templates`](https://github.com/go-gitea/gitea/tree/master/templates) directory of Gitea source (Note: the example link is from the `master` branch. Make sure to use templates compatible with the release you are using).
Be aware that any statement contained inside `{{` and `}}` are Gitea's template syntax and
shouldn't be touched without fully understanding these components.
### Customizing startpage / homepage

1
main.go
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@ -70,6 +70,7 @@ arguments - which can alternatively be run by running the subcommand web.`
cmd.CmdConvert,
cmd.CmdDoctor,
cmd.CmdManager,
cmd.Cmdembedded,
}
// Now adjust these commands to add our global configuration options

31
modules/options/static.go
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@ -113,6 +113,37 @@ func fileFromDir(name string) ([]byte, error) {
return ioutil.ReadAll(f)
}
func Asset(name string) ([]byte, error) {
f, err := Assets.Open("/" + name)
if err != nil {
return nil, err
}
defer f.Close()
return ioutil.ReadAll(f)
}
func AssetNames() []string {
realFS := Assets.(vfsgen۰FS)
var results = make([]string, 0, len(realFS))
for k := range realFS {
results = append(results, k[1:])
}
return results
}
func AssetIsDir(name string) (bool, error) {
if f, err := Assets.Open("/" + name); err != nil {
return false, err
} else {
defer f.Close()
if fi, err := f.Stat(); err != nil {
return false, err
} else {
return fi.IsDir(), nil
}
}
}
// IsDynamic will return false when using embedded data (-tags bindata)
func IsDynamic() bool {
return false

33
modules/public/static.go
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@ -7,6 +7,8 @@
package public
import (
"io/ioutil"
"gitea.com/macaron/macaron"
)
@ -17,3 +19,34 @@ func Static(opts *Options) macaron.Handler {
// used when in the options there is no FileSystem.
return opts.staticHandler("")
}
func Asset(name string) ([]byte, error) {
f, err := Assets.Open("/" + name)
if err != nil {
return nil, err
}
defer f.Close()
return ioutil.ReadAll(f)
}
func AssetNames() []string {
realFS := Assets.(vfsgen۰FS)
var results = make([]string, 0, len(realFS))
for k := range realFS {
results = append(results, k[1:])
}
return results
}
func AssetIsDir(name string) (bool, error) {
if f, err := Assets.Open("/" + name); err != nil {
return false, err
} else {
defer f.Close()
if fi, err := f.Stat(); err != nil {
return false, err
} else {
return fi.IsDir(), nil
}
}
}

13
modules/templates/static.go
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@ -229,3 +229,16 @@ func AssetNames() []string {
}
return results
}
func AssetIsDir(name string) (bool, error) {
if f, err := Assets.Open("/" + name); err != nil {
return false, err
} else {
defer f.Close()
if fi, err := f.Stat(); err != nil {
return false, err
} else {
return fi.IsDir(), nil
}
}
}