gitea/cmd/embedded.go
wxiaoguang 061b68e995
Refactor path & config system (#25330) (#25416)
Backport #25330

# The problem

There were many "path tricks":

* By default, Gitea uses its program directory as its work path
* Gitea tries to use the "work path" to guess its "custom path" and
"custom conf (app.ini)"
* Users might want to use other directories as work path
* The non-default work path should be passed to Gitea by GITEA_WORK_DIR
or "--work-path"
* But some Gitea processes are started without these values
    * The "serv" process started by OpenSSH server
    * The CLI sub-commands started by site admin
* The paths are guessed by SetCustomPathAndConf again and again
* The default values of "work path / custom path / custom conf" can be
changed when compiling

# The solution

* Use `InitWorkPathAndCommonConfig` to handle these path tricks, and use
test code to cover its behaviors.
* When Gitea's web server runs, write the WORK_PATH to "app.ini", this
value must be the most correct one, because if this value is not right,
users would find that the web UI doesn't work and then they should be
able to fix it.
* Then all other sub-commands can use the WORK_PATH in app.ini to
initialize their paths.
* By the way, when Gitea starts for git protocol, it shouldn't output
any log, otherwise the git protocol gets broken and client blocks
forever.

The "work path" priority is: WORK_PATH in app.ini > cmd arg --work-path
> env var GITEA_WORK_DIR > builtin default

The "app.ini" searching order is: cmd arg --config > cmd arg "work path
/ custom path" > env var "work path / custom path" > builtin default


## ⚠️ BREAKING

If your instance's "work path / custom path / custom conf" doesn't meet
the requirements (eg: work path must be absolute), Gitea will report a
fatal error and exit. You need to set these values according to the
error log.
2023-06-22 16:27:18 +00:00

307 lines
7.1 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package cmd
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"code.gitea.io/gitea/modules/assetfs"
"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"
"code.gitea.io/gitea/modules/util"
"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",
},
},
}
matchedAssetFiles []assetFile
)
type assetFile struct {
fs *assetfs.LayeredFS
name string
path string
}
func initEmbeddedExtractor(c *cli.Context) error {
setupConsoleLogger(log.ERROR, log.CanColorStderr, os.Stderr)
patterns, err := compileCollectPatterns(c.Args())
if err != nil {
return err
}
collectAssetFilesByPattern(c, patterns, "options", options.BuiltinAssets())
collectAssetFilesByPattern(c, patterns, "public", public.BuiltinAssets())
collectAssetFilesByPattern(c, patterns, "templates", templates.BuiltinAssets())
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 matchedAssetFiles {
fmt.Println(a.path)
}
return nil
}
func runViewDo(c *cli.Context) error {
if err := initEmbeddedExtractor(c); err != nil {
return err
}
if len(matchedAssetFiles) == 0 {
return fmt.Errorf("no files matched the given pattern")
} else if len(matchedAssetFiles) > 1 {
return fmt.Errorf("too many files matched the given pattern, try to be more specific")
}
data, err := matchedAssetFiles[0].fs.ReadFile(matchedAssetFiles[0].name)
if err != nil {
return fmt.Errorf("%s: %w", matchedAssetFiles[0].path, err)
}
if _, err = os.Stdout.Write(data); err != nil {
return fmt.Errorf("%s: %w", matchedAssetFiles[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("destination %q is not a directory", destdir)
}
fmt.Printf("Extracting to %s:\n", destdir)
overwrite := c.Bool("overwrite")
rename := c.Bool("rename")
for _, a := range matchedAssetFiles {
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 assetFile, overwrite, rename bool) error {
dest := filepath.Join(d, filepath.FromSlash(a.path))
dir := filepath.Dir(dest)
data, err := a.fs.ReadFile(a.name)
if err != nil {
return fmt.Errorf("%s: %w", a.path, err)
}
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return fmt.Errorf("%s: %w", dir, err)
}
perms := os.ModePerm & 0o666
fi, err := os.Lstat(dest)
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return fmt.Errorf("%s: %w", 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 := util.Rename(dest, dest+".bak"); err != nil {
return fmt.Errorf("error creating backup for %s: %w", 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: %w", dest, err)
}
defer file.Close()
if _, err = file.Write(data); err != nil {
return fmt.Errorf("%s: %w", dest, err)
}
fmt.Println(dest)
return nil
}
func collectAssetFilesByPattern(c *cli.Context, globs []glob.Glob, path string, layer *assetfs.Layer) {
fs := assetfs.Layered(layer)
files, err := fs.ListAllFiles(".", true)
if err != nil {
log.Error("Error listing files in %q: %v", path, err)
return
}
for _, name := range files {
if path == "public" &&
strings.HasPrefix(name, "vendor/") &&
!c.Bool("include-vendored") {
continue
}
matchName := path + "/" + name
for _, g := range globs {
if g.Match(matchName) {
matchedAssetFiles = append(matchedAssetFiles, assetFile{fs: fs, name: name, path: path + "/" + name})
break
}
}
}
}
func compileCollectPatterns(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: %w", args[i], err)
} else { //nolint:revive
pat[i] = g
}
}
return pat, nil
}