fix(cli): write CACHEDIR.TAG to log directories

internal/logfile/logfile.go

@@ -24,6 +24,7 @@ import (
  "github.com/kopia/kopia/internal/zaplogutil"
  "github.com/kopia/kopia/repo/content"
  "github.com/kopia/kopia/repo/logging"
+ "github.com/kopia/kopia/internal/cachedir"
 )
 
 const logsDirMode = 0o700
@@ -213,6 +214,15 @@ func (c *loggingFlags) setupLogFileBasedLogger(now time.Time, subdir, suffix, lo
  fmt.Fprintln(os.Stderr, "Unable to create logs directory:", err)
  }
 
+ // write a cachetag.dir to the log path to keep log files out of the backup
+ cacheTagName := filepath.Join(logDir, "CACHEDIR.TAG")
+
+ if _, err := os.Stat(cacheTagName); errors.Is(err, os.ErrNotExist) {
+ if err := cachedir.WriteCacheMarker(logDir); err != nil {
+ fmt.Fprintln(os.Stderr, "Unable to write CACHETAG")
+ }
+ }
+
  sweepLogWG := &sync.WaitGroup{}
  doSweep := func() {}
 

internal/logfile/logfile_test.go

@@ -115,8 +115,8 @@ func TestLogFileRotation(t *testing.T) {
 
  // expected number of files per directory
  subdirs := map[string]int{
- "cli-logs": 3,
- "content-logs": 4,
+ "cli-logs": 4,
+ "content-logs": 5,
  }
 
  for subdir, wantEntryCount := range subdirs {
@@ -189,8 +189,8 @@ func TestLogFileMaxTotalSize(t *testing.T) {
 
  env.RunAndExpectSuccess(t, "snap", "ls", "--file-log-level=debug", "--log-dir", tmpLogDir, fmt.Sprintf("%s=%v", flag, size1MB/2))
  size2 := getTotalDirSize(t, logSubdir)
- require.LessOrEqual(t, size1, size0/2)
- require.LessOrEqual(t, size2, size1/2)
+ require.LessOrEqual(t, size1, size0/2+291)
+ require.LessOrEqual(t, size2, size1/2+291)
  require.Greater(t, size2, size1/4)
  })
  }
@@ -238,3 +238,25 @@ func getTotalDirSize(t *testing.T, dir string) int {
 
  return totalSize
 }
+
+func TestCacheFileExists(t *testing.T) {
+ t.Parallel()
+
+ runner := testenv.NewInProcRunner(t)
+ runner.CustomizeApp = logfile.Attach
+
+ env := testenv.NewCLITest(t, testenv.RepoFormatNotImportant, runner)
+
+ tmpLogDir := testutil.TempDirectory(t)
+ cacheTagName := "CACHEDIR.TAG"
+
+ env.RunAndExpectSuccess(t, "repo", "create", "filesystem", "--path", env.RepoDir, "--log-dir", tmpLogDir)
+
+ if _, err := os.Stat(filepath.Join(tmpLogDir, "cli-logs", cacheTagName)); err != nil {
+ t.Fatal(err)
+ }
+
+ if _, err := os.Stat(filepath.Join(tmpLogDir, "content-logs", cacheTagName)); err != nil {
+ t.Fatal(err)
+ }
+}