status: do not report errors in sequencer/todo

commit 4a72486de9 ("fix cherry-pick/revert status after commit",
2019-04-16) used parse_insn_line() to parse the first line of the todo
list to check if it was a pick or revert. However if the todo list is
left over from an old cherry-pick or revert and references a commit that
no longer exists then parse_insn_line() prints an error message which is
confusing for users [1]. Instead parse just the command name so that the
user is alerted to the presence of stale sequencer state by status
reporting that a cherry-pick or revert is in progress.

Note that we should not be leaving stale sequencer state lying around
(or at least not as often) after commit b07d9bfd17 ("commit/reset: try
to clean up sequencer state", 2019-04-16). However the user may still
have stale state that predates that commit.

Also avoid printing an error message if for some reason the user has a
file called `sequencer` in $GIT_DIR.

[1] https://public-inbox.org/git/3bc58c33-4268-4e7c-bf1a-fe349b3cb037@www.fastmail.com/

Reported-by: Espen Antonsen <espen@inspired.no>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sequencer.c b/sequencer.c
index 793f86bf9aec5a1264fadbe205d84f8371d554c1..f8eab1697e7fcb83b54a902888cf469d710bd728 100644 (file)
--- a/sequencer.c
+++ b/sequencer.c
@@ -2177,34 +2177,26 @@ static int parse_insn_line(struct repository *r, struct todo_item *item,
 
 int sequencer_get_last_command(struct repository *r, enum replay_action *action)
 {
-       struct todo_item item;
-       char *eol;
-       const char *todo_file;
+       const char *todo_file, *bol;
        struct strbuf buf = STRBUF_INIT;
-       int ret = -1;
+       int ret = 0;
 
        todo_file = git_path_todo_file();
        if (strbuf_read_file(&buf, todo_file, 0) < 0) {
-               if (errno == ENOENT)
+               if (errno == ENOENT || errno == ENOTDIR)
                        return -1;
                else
                        return error_errno("unable to open '%s'", todo_file);
        }
-       eol = strchrnul(buf.buf, '\n');
-       if (buf.buf != eol && eol[-1] == '\r')
-               eol--; /* strip Carriage Return */
-       if (parse_insn_line(r, &item, buf.buf, buf.buf, eol))
-               goto fail;
-       if (item.command == TODO_PICK)
+       bol = buf.buf + strspn(buf.buf, " \t\r\n");
+       if (is_command(TODO_PICK, &bol) && (*bol == ' ' || *bol == '\t'))
                *action = REPLAY_PICK;
-       else if (item.command == TODO_REVERT)
+       else if (is_command(TODO_REVERT, &bol) &&
+                (*bol == ' ' || *bol == '\t'))
                *action = REPLAY_REVERT;
        else
-               goto fail;
-
-       ret = 0;
+               ret = -1;
 
- fail:
        strbuf_release(&buf);
 
        return ret;

diff --git a/t/t7512-status-help.sh b/t/t7512-status-help.sh
index c1eb72555d0c9878aafe04b8b3f69392a0b32dcd..3c9308709abe430cd056cde6af2107b947d337b2 100755 (executable)
--- a/t/t7512-status-help.sh
+++ b/t/t7512-status-help.sh
@@ -798,6 +798,22 @@ EOF
        test_i18ncmp expected actual
 '
 
+test_expect_success 'status shows cherry-pick with invalid oid' '
+       mkdir .git/sequencer &&
+       test_write_lines "pick invalid-oid" >.git/sequencer/todo &&
+       git status --untracked-files=no >actual 2>err &&
+       git cherry-pick --quit &&
+       test_must_be_empty err &&
+       test_i18ncmp expected actual
+'
+
+test_expect_success 'status does not show error if .git/sequencer is a file' '
+       test_when_finished "rm .git/sequencer" &&
+       test_write_lines hello >.git/sequencer &&
+       git status --untracked-files=no 2>err &&
+       test_must_be_empty err
+'
+
 test_expect_success 'status showing detached at and from a tag' '
        test_commit atag tagging &&
        git checkout atag &&