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[PATCH v2 14/17] rename_ref(): extract function rename_tmp_log()

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
Jan 6, 2014, 13:45 UTC
Message-ID
<1389015935-21936-15-git-send-email-mhagger@alum.mit.edu>
In-Reply-To
<1389015935-21936-1-git-send-email-mhagger@alum.mit.edu>
It's about to become a bit more complex.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs.c | 52 ++++++++++++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 22 deletions(-)
diff --git a/refs.c b/refs.c
index 8a3d3ea..5bc01a7 100644
--- a/refs.c
+++ b/refs.c
@@ -2528,6 +2528,35 @@ int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
  */
 #define TMP_RENAMED_LOG  "logs/refs/.tmp-renamed-log"
 
+static int rename_tmp_log(const char *newrefname)
+{
+	if (safe_create_leading_directories(git_path("logs/%s", newrefname))) {
+		error("unable to create directory for %s", newrefname);
+		return -1;
+	}
+
+ retry:
+	if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
+		if (errno==EISDIR || errno==ENOTDIR) {
+			/*
+			 * rename(a, b) when b is an existing
+			 * directory ought to result in ISDIR, but
+			 * Solaris 5.8 gives ENOTDIR.  Sheesh.
+			 */
+			if (remove_empty_directories(git_path("logs/%s", newrefname))) {
+				error("Directory not empty: logs/%s", newrefname);
+				return -1;
+			}
+			goto retry;
+		} else {
+			error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
+				newrefname, strerror(errno));
+			return -1;
+		}
+	}
+	return 0;
+}
+
 int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
 {
 	unsigned char sha1[20], orig_sha1[20];
@@ -2575,30 +2604,9 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
 		}
 	}
 
-	if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
-		error("unable to create directory for %s", newrefname);
+	if (log && rename_tmp_log(newrefname))
 		goto rollback;
-	}
 
- retry:
-	if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
-		if (errno==EISDIR || errno==ENOTDIR) {
-			/*
-			 * rename(a, b) when b is an existing
-			 * directory ought to result in ISDIR, but
-			 * Solaris 5.8 gives ENOTDIR.  Sheesh.
-			 */
-			if (remove_empty_directories(git_path("logs/%s", newrefname))) {
-				error("Directory not empty: logs/%s", newrefname);
-				goto rollback;
-			}
-			goto retry;
-		} else {
-			error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
-				newrefname, strerror(errno));
-			goto rollback;
-		}
-	}
 	logmoved = log;
 
 	lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
-- 
1.8.5.2
Previous: Junio C HamanoNext: Michael Haggerty
Message 24 of 29 in “Fix some mkdir/rmdir races”
  1. 00/17 Fix some mkdir/rmdir racesMichael Haggerty, Jan 6, 2014
  2. 01/17 safe_create_leading_directories(): fix format of "if" chainingMichael Haggerty, Jan 6, 2014
  3. 02/17 safe_create_leading_directories(): reduce scope of local variableMichael Haggerty, Jan 6, 2014
  4. 03/17 safe_create_leading_directories(): add explicit "slash" pointerMichael Haggerty, Jan 6, 2014
  5. Junio C HamanoJan 6, 2014
  6. Michael HaggertyJan 7, 2014
  7. Junio C HamanoJan 7, 2014
  8. Sebastian SchuberthJan 19, 2014
  9. 04/17 safe_create_leading_directories(): rename local variableMichael Haggerty, Jan 6, 2014
  10. 05/17 safe_create_leading_directories(): split on first of multiple slashesMichael Haggerty, Jan 6, 2014
  11. 06/17 safe_create_leading_directories(): always restore slash at end of loopMichael Haggerty, Jan 6, 2014
  12. 07/17 safe_create_leading_directories(): introduce enum for return valuesMichael Haggerty, Jan 6, 2014
  13. 08/17 cmd_init_db(): when creating directories, handle errors conservativelyMichael Haggerty, Jan 6, 2014
  14. 09/17 safe_create_leading_directories(): add new error value SCLD_VANISHEDMichael Haggerty, Jan 6, 2014
  15. 10/17 lock_ref_sha1_basic(): on SCLD_VANISHED, retryMichael Haggerty, Jan 6, 2014
  16. Junio C HamanoJan 6, 2014
  17. Michael HaggertyJan 7, 2014
  18. 11/17 lock_ref_sha1_basic(): if locking fails with ENOENT, retryMichael Haggerty, Jan 6, 2014
  19. 12/17 remove_dir_recurse(): tighten condition for removing unreadable dirMichael Haggerty, Jan 6, 2014
  20. 13/17 remove_dir_recurse(): handle disappearing files and directoriesMichael Haggerty, Jan 6, 2014
  21. Junio C HamanoJan 6, 2014
  22. Michael HaggertyJan 7, 2014
  23. Junio C HamanoJan 7, 2014
  24. 14/17 rename_ref(): extract function rename_tmp_log()Michael Haggerty, Jan 6, 2014
  25. 15/17 rename_tmp_log(): handle a possible mkdir/rmdir raceMichael Haggerty, Jan 6, 2014
  26. 16/17 rename_tmp_log(): limit the number of remote_empty_directories() attemptsMichael Haggerty, Jan 6, 2014
  27. 17/17 rename_tmp_log(): on SCLD_VANISHED, retryMichael Haggerty, Jan 6, 2014
  28. Junio C HamanoJan 6, 2014
  29. Michael HaggertyJan 7, 2014

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