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package git
import (
"context"
"io/ioutil"
"os"
"path/filepath"
"strings"
grpc_logrus "github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus"
)
// ObjectDirectories looks for Git object directories, including
// alternates specified in objects/info/alternates.
//
// CAVEAT Git supports quoted strings in here, but we do not. We should
// never need those on a Gitaly server.
func ObjectDirectories(ctx context.Context, repoPath string) ([]string, error) {
objDir := filepath.Join(repoPath, "objects")
dirs, err := altObjectDirs(ctx, objDir, 0)
if err != nil {
return nil, err
}
return dirs, nil
}
func altObjectDirs(ctx context.Context, objDir string, depth int) ([]string, error) {
logEntry := grpc_logrus.Extract(ctx)
const maxAlternatesDepth = 5 // Taken from https://github.com/git/git/blob/v2.23.0/sha1-file.c#L575
if depth > maxAlternatesDepth {
logEntry.WithField("objdir", objDir).Warn("ignoring deeply nested alternate object directory")
return nil, nil
}
fi, err := os.Stat(objDir)
if os.IsNotExist(err) {
logEntry.WithField("objdir", objDir).Warn("object directory not found")
return nil, nil
}
if err != nil {
return nil, err
}
if !fi.IsDir() {
return nil, nil
}
dirs := []string{objDir}
alternates, err := ioutil.ReadFile(filepath.Join(objDir, "info", "alternates"))
if os.IsNotExist(err) {
return dirs, nil
}
if err != nil {
return nil, err
}
for _, newDir := range strings.Split(string(alternates), "\n") {
if len(newDir) == 0 || newDir[0] == '#' {
continue
}
if !filepath.IsAbs(newDir) {
newDir = filepath.Join(objDir, newDir)
}
nestedDirs, err := altObjectDirs(ctx, newDir, depth+1)
if err != nil {
return nil, err
}
dirs = append(dirs, nestedDirs...)
}
return dirs, nil
}
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