X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=refs.c;h=b5400674d7a1fcf4cc16dd630b8671b2ad7b9f7b;hb=48c250a121a425a1860226b6a7061aecfbab5246;hp=d3db15a76cc46f6f6a31d4448816c09e6c48e543;hpb=82df0ef1c33a077313d29bd1d4692c0fadc29624;p=git.git

diff --git a/refs.c b/refs.c
index d3db15a76..b5400674d 100644
--- a/refs.c
+++ b/refs.c
@@ -314,7 +314,11 @@ static int warn_if_dangling_symref(const char *refname, const unsigned char *sha
 
 void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
 {
-	struct warn_if_dangling_data data = { fp, refname, msg_fmt };
+	struct warn_if_dangling_data data;
+
+	data.fp = fp;
+	data.refname = refname;
+	data.msg_fmt = msg_fmt;
 	for_each_rawref(warn_if_dangling_symref, &data);
 }
 
@@ -1086,6 +1090,15 @@ int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
 	return ret;
 }
 
+/*
+ * People using contrib's git-new-workdir have .git/logs/refs ->
+ * /some/other/path/.git/logs/refs, and that may live on another device.
+ *
+ * IOW, to avoid cross device rename errors, the temporary renamed log must
+ * live into logs/refs.
+ */
+#define TMP_RENAMED_LOG  "logs/refs/.tmp-renamed-log"
+
 int rename_ref(const char *oldref, const char *newref, const char *logmsg)
 {
 	static const char renamed_ref[] = "RENAMED-REF";
@@ -1119,8 +1132,8 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
 	if (write_ref_sha1(lock, orig_sha1, logmsg))
 		return error("unable to save current sha1 in %s", renamed_ref);
 
-	if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
-		return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
+	if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
+		return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
 			oldref, strerror(errno));
 
 	if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
@@ -1146,7 +1159,7 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
 	}
 
  retry:
-	if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
+	if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) {
 		if (errno==EISDIR || errno==ENOTDIR) {
 			/*
 			 * rename(a, b) when b is an existing
@@ -1159,7 +1172,7 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
 			}
 			goto retry;
 		} else {
-			error("unable to move logfile tmp-renamed-log to logs/%s: %s",
+			error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
 				newref, strerror(errno));
 			goto rollback;
 		}
@@ -1199,8 +1212,8 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
 		error("unable to restore logfile %s from %s: %s",
 			oldref, newref, strerror(errno));
 	if (!logmoved && log &&
-	    rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
-		error("unable to restore logfile %s from tmp-renamed-log: %s",
+	    rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref)))
+		error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
 			oldref, strerror(errno));
 
 	return 1;
@@ -1258,52 +1271,65 @@ static int copy_msg(char *buf, const char *msg)
 	return cp - buf;
 }
 
-static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
-			 const unsigned char *new_sha1, const char *msg)
+int log_ref_setup(const char *ref_name, char *logfile, int bufsize)
 {
-	int logfd, written, oflags = O_APPEND | O_WRONLY;
-	unsigned maxlen, len;
-	int msglen;
-	char log_file[PATH_MAX];
-	char *logrec;
-	const char *committer;
-
-	if (log_all_ref_updates < 0)
-		log_all_ref_updates = !is_bare_repository();
-
-	git_snpath(log_file, sizeof(log_file), "logs/%s", ref_name);
+	int logfd, oflags = O_APPEND | O_WRONLY;
 
+	git_snpath(logfile, bufsize, "logs/%s", ref_name);
 	if (log_all_ref_updates &&
 	    (!prefixcmp(ref_name, "refs/heads/") ||
 	     !prefixcmp(ref_name, "refs/remotes/") ||
 	     !prefixcmp(ref_name, "refs/notes/") ||
 	     !strcmp(ref_name, "HEAD"))) {
-		if (safe_create_leading_directories(log_file) < 0)
+		if (safe_create_leading_directories(logfile) < 0)
 			return error("unable to create directory for %s",
-				     log_file);
+				     logfile);
 		oflags |= O_CREAT;
 	}
 
-	logfd = open(log_file, oflags, 0666);
+	logfd = open(logfile, oflags, 0666);
 	if (logfd < 0) {
 		if (!(oflags & O_CREAT) && errno == ENOENT)
 			return 0;
 
 		if ((oflags & O_CREAT) && errno == EISDIR) {
-			if (remove_empty_directories(log_file)) {
+			if (remove_empty_directories(logfile)) {
 				return error("There are still logs under '%s'",
-					     log_file);
+					     logfile);
 			}
-			logfd = open(log_file, oflags, 0666);
+			logfd = open(logfile, oflags, 0666);
 		}
 
 		if (logfd < 0)
 			return error("Unable to append to %s: %s",
-				     log_file, strerror(errno));
+				     logfile, strerror(errno));
 	}
 
-	adjust_shared_perm(log_file);
+	adjust_shared_perm(logfile);
+	close(logfd);
+	return 0;
+}
+
+static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
+			 const unsigned char *new_sha1, const char *msg)
+{
+	int logfd, result, written, oflags = O_APPEND | O_WRONLY;
+	unsigned maxlen, len;
+	int msglen;
+	char log_file[PATH_MAX];
+	char *logrec;
+	const char *committer;
+
+	if (log_all_ref_updates < 0)
+		log_all_ref_updates = !is_bare_repository();
+
+	result = log_ref_setup(ref_name, log_file, sizeof(log_file));
+	if (result)
+		return result;
 
+	logfd = open(log_file, oflags);
+	if (logfd < 0)
+		return 0;
 	msglen = msg ? strlen(msg) : 0;
 	committer = git_committer_info(0);
 	maxlen = strlen(committer) + msglen + 100;