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package housekeeping
import (
"os"
"path/filepath"
"strings"
"time"
grpc_logrus "github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
const deleteTempFilesOlderThanDuration = 7 * 24 * time.Hour
// Perform will perform housekeeping duties on a repository
func Perform(ctx context.Context, repoPath string) error {
logger := grpc_logrus.Extract(ctx).WithField("system", "housekeeping")
filesMarkedForRemoval := 0
unremovableFiles := 0
err := filepath.Walk(repoPath, func(path string, info os.FileInfo, _ error) error {
if repoPath == path {
// Never consider the root path
return nil
}
if info == nil || !shouldRemove(path, info.ModTime(), info.Mode()) {
return nil
}
filesMarkedForRemoval++
if err := forceRemove(path); err != nil {
unremovableFiles++
logger.WithError(err).WithField("path", path).Warn("unable to remove stray file")
}
if info.IsDir() {
// Do not walk removed directories
return filepath.SkipDir
}
return nil
})
if filesMarkedForRemoval > 0 {
logger.WithFields(log.Fields{
"files": filesMarkedForRemoval,
"failures": unremovableFiles,
}).Info("removed files")
}
return err
}
// FixDirectoryPermissions does a recursive directory walk to look for
// directories that cannot be accessed by the current user, and tries to
// fix those with chmod. The motivating problem is that directories with mode
// 0 break os.RemoveAll.
func FixDirectoryPermissions(path string) error {
return fixDirectoryPermissions(path, make(map[string]struct{}))
}
const minimumDirPerm = 0700
func fixDirectoryPermissions(path string, retriedPaths map[string]struct{}) error {
return filepath.Walk(path, func(path string, info os.FileInfo, errIncoming error) error {
if !info.IsDir() || info.Mode()&minimumDirPerm == minimumDirPerm {
return nil
}
if err := os.Chmod(path, info.Mode()|minimumDirPerm); err != nil {
return err
}
if _, retried := retriedPaths[path]; !retried && os.IsPermission(errIncoming) {
retriedPaths[path] = struct{}{}
return fixDirectoryPermissions(path, retriedPaths)
}
return nil
})
}
// Delete a directory structure while ensuring the current user has permission to delete the directory structure
func forceRemove(path string) error {
err := os.RemoveAll(path)
if err == nil {
return nil
}
// Delete failed. Try again after chmod'ing directories recursively
if err := FixDirectoryPermissions(path); err != nil {
return err
}
return os.RemoveAll(path)
}
func shouldRemove(path string, modTime time.Time, mode os.FileMode) bool {
base := filepath.Base(path)
// Only delete entries starting with `tmp_` and older than a week
return strings.HasPrefix(base, "tmp_") && time.Since(modTime) >= deleteTempFilesOlderThanDuration
}
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