From: Simon Ruderich <simon@ruderich.org>
Date: Sun, 4 Apr 2021 08:50:05 +0000 (+0200)
Subject: sync: refactor temporary file creation into WriteTemp()
X-Git-Url: https://ruderich.org/simon/gitweb/?p=safcm%2Fsafcm.git;a=commitdiff_plain;h=4914f4548a82ae6c4851680d0140d6b572d56e8e

sync: refactor temporary file creation into WriteTemp()

Make it public because it will be used by other packages in the near
future.
---

diff --git a/cmd/safcm-remote/sync/files.go b/cmd/safcm-remote/sync/files.go
index 158b553..6e001a8 100644
--- a/cmd/safcm-remote/sync/files.go
+++ b/cmd/safcm-remote/sync/files.go
@@ -337,43 +337,11 @@ reopen:
 	case 0: // regular file
 		debugf("creating temporary file %q",
 			filepath.Join(dir, base+"*"))
-		newFh, err := os.CreateTemp(dir, base)
+		tmpPath, err = WriteTemp(dir, base, file.Data,
+			file.Uid, file.Gid, file.Mode)
 		if err != nil {
 			return err
 		}
-		tmpPath = newFh.Name()
-
-		_, err = newFh.Write(file.Data)
-		if err != nil {
-			newFh.Close()
-			os.Remove(tmpPath)
-			return err
-		}
-		// CreateTemp() creates the file with 0600
-		err = newFh.Chown(file.Uid, file.Gid)
-		if err != nil {
-			newFh.Close()
-			os.Remove(tmpPath)
-			return err
-		}
-		err = newFh.Chmod(file.Mode)
-		if err != nil {
-			newFh.Close()
-			os.Remove(tmpPath)
-			return err
-		}
-		err = newFh.Sync()
-		if err != nil {
-			newFh.Close()
-			os.Remove(tmpPath)
-			return err
-		}
-		err = newFh.Close()
-		if err != nil {
-			newFh.Close()
-			os.Remove(tmpPath)
-			return err
-		}
 
 	case fs.ModeSymlink:
 		i := 0
@@ -505,6 +473,50 @@ func OpenFileNoFollow(path string) (*os.File, error) {
 		os.O_RDONLY|syscall.O_NOFOLLOW|syscall.O_NONBLOCK, 0)
 }
 
+func WriteTemp(dir, base string, data []byte, uid, gid int, mode fs.FileMode) (
+	string, error) {
+
+	fh, err := os.CreateTemp(dir, base)
+	if err != nil {
+		return "", err
+	}
+	tmpPath := fh.Name()
+
+	_, err = fh.Write(data)
+	if err != nil {
+		fh.Close()
+		os.Remove(tmpPath)
+		return "", err
+	}
+	// CreateTemp() creates the file with 0600
+	err = fh.Chown(uid, gid)
+	if err != nil {
+		fh.Close()
+		os.Remove(tmpPath)
+		return "", err
+	}
+	err = fh.Chmod(mode)
+	if err != nil {
+		fh.Close()
+		os.Remove(tmpPath)
+		return "", err
+	}
+	err = fh.Sync()
+	if err != nil {
+		fh.Close()
+		os.Remove(tmpPath)
+		return "", err
+	}
+	err = fh.Close()
+	if err != nil {
+		fh.Close()
+		os.Remove(tmpPath)
+		return "", err
+	}
+
+	return tmpPath, nil
+}
+
 // syncPath syncs path, which should be a directory. To guarantee durability
 // it must be called on a parent directory after adding, renaming or removing
 // files therein.