safe_create_leading_directories(): set errno on SCLD_EXISTS

The exit path for SCLD_EXISTS wasn't setting errno, which some callers
use to generate error messages for the user. Fix the problem and
document that the function sets errno correctly to help avoid similar
regressions in the future.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index a50a61a19787de94daa9d66caa9fcccca58081fe..8177c3a744b6a63cc12cea2211b36bf4cf92fcef 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1031,8 +1031,9 @@ int adjust_shared_perm(const char *path);
 
 /*
  * Create the directory containing the named path, using care to be
- * somewhat safe against races.  Return one of the scld_error values
- * to indicate success/failure.
+ * somewhat safe against races. Return one of the scld_error values to
+ * indicate success/failure. On error, set errno to describe the
+ * problem.
  *
  * SCLD_VANISHED indicates that one of the ancestor directories of the
  * path existed at one point during the function call and then

diff --git a/sha1_file.c b/sha1_file.c
index 10395e7e4bb53e107bfb26bdc84768d0883d362f..ae8f0b419590c9e75f9c714142cc9ca818e1faa2 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -137,8 +137,10 @@ enum scld_error safe_create_leading_directories(char *path)
                *slash = '\0';
                if (!stat(path, &st)) {
                        /* path exists */
-                       if (!S_ISDIR(st.st_mode))
+                       if (!S_ISDIR(st.st_mode)) {
+                               errno = ENOTDIR;
                                ret = SCLD_EXISTS;
+                       }
                } else if (mkdir(path, 0777)) {
                        if (errno == EEXIST &&
                            !stat(path, &st) && S_ISDIR(st.st_mode))