[PATCH v16 09/48] refs.c: make sure log_ref_setup returns a meaningful errno

[Ronnie Sahlberg]

Making errno when returning from log_ref_setup() meaningful,

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 refs.c | 29 ++++++++++++++++++++---------
 refs.h |  4 +++-
 2 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/refs.c b/refs.c
index b4b05bd..6f85bd8 100644
--- a/refs.c
+++ b/refs.c
@@ -2723,6 +2723,7 @@ static int copy_msg(char *buf, const char *msg)
        return cp - buf;
 }
 
+/* This function must set a meaningful errno on failure */
 int log_ref_setup(const char *refname, char *logfile, int bufsize)
 {
        int logfd, oflags = O_APPEND | O_WRONLY;
@@ -2733,9 +2734,12 @@ int log_ref_setup(const char *refname, char *logfile, 
int bufsize)
             starts_with(refname, "refs/remotes/") ||
             starts_with(refname, "refs/notes/") ||
             !strcmp(refname, "HEAD"))) {
-               if (safe_create_leading_directories(logfile) < 0)
-                       return error("unable to create directory for %s",
-                                    logfile);
+               if (safe_create_leading_directories(logfile) < 0) {
+                       int save_errno = errno;
+                       error("unable to create directory for %s", logfile);
+                       errno = save_errno;
+                       return -1;
+               }
                oflags |= O_CREAT;
        }
 
@@ -2746,15 +2750,22 @@ int log_ref_setup(const char *refname, char *logfile, 
int bufsize)
 
                if ((oflags & O_CREAT) && errno == EISDIR) {
                        if (remove_empty_directories(logfile)) {
-                               return error("There are still logs under '%s'",
-                                            logfile);
-                       }
+                               int save_errno = errno;
+                               error("There are still logs under '%s'",
+                                     logfile);
+                               errno = save_errno;
+                               return -1;
+                       }
                        logfd = open(logfile, oflags, 0666);
                }
 
-               if (logfd < 0)
-                       return error("Unable to append to %s: %s",
-                                    logfile, strerror(errno));
+               if (logfd < 0) {
+                       int save_errno = errno;
+                       error("Unable to append to %s: %s", logfile,
+                             strerror(errno));
+                       errno = save_errno;
+                       return -1;
+               }
        }
 
        adjust_shared_perm(logfile);
diff --git a/refs.h b/refs.h
index 948cc53..979c12f 100644
--- a/refs.h
+++ b/refs.h
@@ -154,7 +154,9 @@ extern void unlock_ref(struct ref_lock *lock);
 /** Writes sha1 into the ref specified by the lock. **/
 extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, 
const char *msg);
 
-/** Setup reflog before using. **/
+/*
+ * Setup reflog before using. Set errno to something meaningful on failure.
+ */
 int log_ref_setup(const char *refname, char *logfile, int bufsize);
 
 /** Reads log for the value of ref during at_time. **/
-- 
2.0.0.599.g83ced0e

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