[PATCH v2 09/20] log_ref_setup(): pass the open file descriptor back to the caller

From

Michael Haggerty <mhagger@alum.mit.edu>

Date

Feb 25, 2016, 13:16 UTC

Message-ID

<19b83a0ba835dc711a78e56be0b287d5340f2816.1456405699.git.mhagger@alum.mit.edu>

In-Reply-To

<cover.1456405698.git.mhagger@alum.mit.edu>

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs/files-backend.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 2cc9489..5937099 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2591,19 +2591,23 @@ static int open_or_create_logfile(const char *path, void *cb)
 }
 
 /*
- * Create a reflog for a ref.  If force_create = 0, the reflog will
- * only be created for certain refs (those for which
- * should_autocreate_reflog returns non-zero.  Otherwise, create it
- * regardless of the ref name.  Fill in *err and return -1 on failure.
+ * Create a reflog for a ref. Store its path to *logfile. If
+ * force_create = 0, only create the reflog for certain refs (those
+ * for which should_autocreate_reflog returns non-zero). Otherwise,
+ * create it regardless of the reference name. If the logfile already
+ * existed or was created, return 0 and set *logfd to the file
+ * descriptor opened for appending to the file. If no logfile exists
+ * and we decided not to create one, return 0 and set *logfd to -1. On
+ * failure, fill in *err and return -1.
  */
-static int log_ref_setup(const char *refname, struct strbuf *logfile, struct strbuf *err, int force_create)
+static int log_ref_setup(const char *refname,
+			 struct strbuf *logfile, int *logfd,
+			 struct strbuf *err, int force_create)
 {
-	int logfd;
-
 	strbuf_git_path(logfile, "logs/%s", refname);
 
 	if (force_create || should_autocreate_reflog(refname)) {
-		if (raceproof_create_file(logfile->buf, open_or_create_logfile, &logfd) < 0) {
+		if (raceproof_create_file(logfile->buf, open_or_create_logfile, logfd) < 0) {
 			if (errno == ENOENT) {
 				strbuf_addf(err, "unable to create directory for %s: "
 					    "%s", logfile->buf, strerror(errno));
@@ -2617,11 +2621,10 @@ static int log_ref_setup(const char *refname, struct strbuf *logfile, struct str
 			return -1;
 		} else {
 			adjust_shared_perm(logfile->buf);
-			close(logfd);
 		}
 	} else {
-		logfd = open(logfile->buf, O_APPEND | O_WRONLY, 0666);
-		if (logfd < 0) {
+		*logfd = open(logfile->buf, O_APPEND | O_WRONLY, 0666);
+		if (*logfd < 0) {
 			if (errno == ENOENT || errno == EISDIR) {
 				/*
 				 * The logfile doesn't already exist,
@@ -2636,7 +2639,6 @@ static int log_ref_setup(const char *refname, struct strbuf *logfile, struct str
 			}
 		} else {
 			adjust_shared_perm(logfile->buf);
-			close(logfd);
 		}
 	}
 
@@ -2647,8 +2649,11 @@ int safe_create_reflog(const char *refname, int force_create, struct strbuf *err
 {
 	int ret;
 	struct strbuf sb = STRBUF_INIT;
+	int fd;
 
-	ret = log_ref_setup(refname, &sb, err, force_create);
+	ret = log_ref_setup(refname, &sb, &fd, err, force_create);
+	if (!ret && fd >= 0)
+		close(fd);
 	strbuf_release(&sb);
 	return ret;
 }
@@ -2684,17 +2689,17 @@ static int log_ref_write_1(const char *refname, const unsigned char *old_sha1,
 			   struct strbuf *logfile, int flags,
 			   struct strbuf *err)
 {
-	int logfd, result, oflags = O_APPEND | O_WRONLY;
+	int logfd, result;
 
 	if (log_all_ref_updates < 0)
 		log_all_ref_updates = !is_bare_repository();
 
-	result = log_ref_setup(refname, logfile, err, flags & REF_FORCE_CREATE_REFLOG);
+	result = log_ref_setup(refname, logfile, &logfd, err,
+			       flags & REF_FORCE_CREATE_REFLOG);
 
 	if (result)
 		return result;
 
-	logfd = open(logfile->buf, oflags);
 	if (logfd < 0)
 		return 0;
 	result = log_ref_write_fd(logfd, old_sha1, new_sha1,

-- 
2.7.0