close_sha1_file(): make it easier to diagnose errors

A bug report with "unable to write sha1 file" made us realize that we do
not have enough information to guess why close() is failing.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sha1_file.c b/sha1_file.c
index bea958ec81ce1e1904b1b574348faae4eea4c3d0..bcfcab351dd9f8d5b4e1cc0d86ecd2162f46cf94 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2241,7 +2241,7 @@ static void close_sha1_file(int fd)
                fsync_or_die(fd, "sha1 file");
        fchmod(fd, 0444);
        if (close(fd) != 0)
-               die("unable to write sha1 file");
+               die("error when closing sha1 file (%s)", strerror(errno));
 }
 
 /* Size of directory component, including the ending '/' */