sequencer: avoid using errno clobbered by rollback_lock_file()

As pointed out in a review of the `--rebase-merges` patch series,
`rollback_lock_file()` clobbers errno. Therefore, we have to report the
error message that uses errno before calling said function.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sequencer.c b/sequencer.c
index 5e3a50fafc91c7ce7488c20fcb0c663c3384a862..674e26bf8264a81a2a18f2385026b52046f256b7 100644 (file)
--- a/sequencer.c
+++ b/sequencer.c
@@ -346,12 +346,14 @@ static int write_message(const void *buf, size_t len, const char *filename,
        if (msg_fd < 0)
                return error_errno(_("could not lock '%s'"), filename);
        if (write_in_full(msg_fd, buf, len) < 0) {
+               error_errno(_("could not write to '%s'"), filename);
                rollback_lock_file(&msg_file);
-               return error_errno(_("could not write to '%s'"), filename);
+               return -1;
        }
        if (append_eol && write(msg_fd, "\n", 1) < 0) {
+               error_errno(_("could not write eol to '%s'"), filename);
                rollback_lock_file(&msg_file);
-               return error_errno(_("could not write eol to '%s'"), filename);
+               return -1;
        }
        if (commit_lock_file(&msg_file) < 0)
                return error(_("failed to finalize '%s'"), filename);
@@ -2125,9 +2127,9 @@ static int save_head(const char *head)
        written = write_in_full(fd, buf.buf, buf.len);
        strbuf_release(&buf);
        if (written < 0) {
+               error_errno(_("could not write to '%s'"), git_path_head_file());
                rollback_lock_file(&head_lock);
-               return error_errno(_("could not write to '%s'"),
-                                  git_path_head_file());
+               return -1;
        }
        if (commit_lock_file(&head_lock) < 0)
                return error(_("failed to finalize '%s'"), git_path_head_file());