To be truly useful, the sequencer should never die() but always return
an error.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 sequencer.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 1706ef4..3e07aa0 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -844,18 +844,22 @@ static int create_seq_dir(void)
        return 0;
 }
 
-static void save_head(const char *head)
+static int save_head(const char *head)
 {
        static struct lock_file head_lock;
        struct strbuf buf = STRBUF_INIT;
        int fd;
 
-       fd = hold_lock_file_for_update(&head_lock, git_path_head_file(), 
LOCK_DIE_ON_ERROR);
+       fd = hold_lock_file_for_update(&head_lock, git_path_head_file(), 0);
+       if (fd < 0)
+               return error_errno(_("Could not lock HEAD"));
        strbuf_addf(&buf, "%s\n", head);
        if (write_in_full(fd, buf.buf, buf.len) < 0)
-               die_errno(_("Could not write to %s"), git_path_head_file());
+               return error_errno(_("Could not write to %s"),
+                                  git_path_head_file());
        if (commit_lock_file(&head_lock) < 0)
-               die(_("Error wrapping up %s."), git_path_head_file());
+               return error(_("Error wrapping up %s."), git_path_head_file());
+       return 0;
 }
 
 static int reset_for_rollback(const unsigned char *sha1)
@@ -1118,7 +1122,8 @@ int sequencer_pick_revisions(struct replay_opts *opts)
                return -1;
        if (get_sha1("HEAD", sha1) && (opts->action == REPLAY_REVERT))
                return error(_("Can't revert as initial commit"));
-       save_head(sha1_to_hex(sha1));
+       if (save_head(sha1_to_hex(sha1)))
+               return -1;
        save_opts(opts);
        return pick_commits(todo_list, opts);
 }
-- 
2.10.0.rc1.99.gcd66998


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