Use die_errno() instead of die() when checking syscalls

Lots of die() calls did not actually report the kind of error, which
can leave the user confused as to the real problem.  Use die_errno()
where we check a system/library call that sets errno on failure, or
one of the following that wrap such calls:

  Function              Passes on error from
  --------              --------------------
  odb_pack_keep         open
  read_ancestry         fopen
  read_in_full          xread
  strbuf_read           xread
  strbuf_read_file      open or strbuf_read_file
  strbuf_readlink       readlink
  write_in_full         xwrite

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fast-import.c b/fast-import.c
index d31a4e8..7ef9865 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -905,10 +905,10 @@ static char *keep_pack(char *curr_index_name)
 
 	keep_fd = odb_pack_keep(name, sizeof(name), pack_data->sha1);
 	if (keep_fd < 0)
-		die("cannot create keep file");
+		die_errno("cannot create keep file");
 	write_or_die(keep_fd, keep_msg, strlen(keep_msg));
 	if (close(keep_fd))
-		die("failed to write keep file");
+		die_errno("failed to write keep file");
 
 	snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
 		 get_object_directory(), sha1_to_hex(pack_data->sha1));