revert: make commit subjects in insn sheet optional

Change the instruction sheet format subtly so that the subject of the
commit message that follows the object name is optional.  As a result,
an instruction sheet like this is now perfectly valid:

  pick 35b0426
  pick fbd5bbcbc2e
  pick 7362160f

While at it, also fix a bug introduced by 5a5d80f4 (revert: Introduce
--continue to continue the operation, 2011-08-04) that failed to read
lines that are too long to fit on the commit-id-shaped buffer we
currently use; eliminate the need for the buffer altogether.  In
addition to literal SHA-1 hexes, you can now safely use expressions
like the following in the instruction sheet:

  featurebranch~4
  rr/revert-cherry-pick-continue^2~12@{12 days ago}

[jc: simplify parsing]

Suggested-by: Jonathan Nieder <jrnieder@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/revert.c b/builtin/revert.c
index 76a1633b9bdc42393c9b8e3c6a4641c42a6ee950..6d520aee7d6d8d0f5426a3ddd0bccfea0ec90346 100644 (file)
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -714,31 +714,27 @@ static int format_todo(struct strbuf *buf, struct commit_list *todo_list,
        return 0;
 }
 
-static struct commit *parse_insn_line(char *start, struct replay_opts *opts)
+static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *opts)
 {
        unsigned char commit_sha1[20];
-       char sha1_abbrev[40];
        enum replay_action action;
-       int insn_len = 0;
-       char *p, *q;
+       char *end_of_object_name;
+       int saved, status;
 
-       if (!prefixcmp(start, "pick ")) {
+       if (!prefixcmp(bol, "pick ")) {
                action = CHERRY_PICK;
-               insn_len = strlen("pick");
-               p = start + insn_len + 1;
-       } else if (!prefixcmp(start, "revert ")) {
+               bol += strlen("pick ");
+       } else if (!prefixcmp(bol, "revert ")) {
                action = REVERT;
-               insn_len = strlen("revert");
-               p = start + insn_len + 1;
+               bol += strlen("revert ");
        } else
                return NULL;
 
-       q = strchr(p, ' ');
-       if (!q)
-               return NULL;
-       q++;
-
-       strlcpy(sha1_abbrev, p, q - p);
+       end_of_object_name = bol + strcspn(bol, " \n");
+       saved = *end_of_object_name;
+       *end_of_object_name = '\0';
+       status = get_sha1(bol, commit_sha1);
+       *end_of_object_name = saved;
 
        /*
         * Verify that the action matches up with the one in
@@ -751,7 +747,7 @@ static struct commit *parse_insn_line(char *start, struct replay_opts *opts)
                return NULL;
        }
 
-       if (get_sha1(sha1_abbrev, commit_sha1) < 0)
+       if (status < 0)
                return NULL;
 
        return lookup_commit_reference(commit_sha1);
@@ -766,13 +762,12 @@ static int parse_insn_buffer(char *buf, struct commit_list **todo_list,
        int i;
 
        for (i = 1; *p; i++) {
-               commit = parse_insn_line(p, opts);
+               char *eol = strchrnul(p, '\n');
+               commit = parse_insn_line(p, eol, opts);
                if (!commit)
                        return error(_("Could not parse line %d."), i);
                next = commit_list_append(commit, next);
-               p = strchrnul(p, '\n');
-               if (*p)
-                       p++;
+               p = *eol ? eol + 1 : eol;
        }
        if (!*todo_list)
                return error(_("No commits parsed."));

diff --git a/t/t3510-cherry-pick-sequence.sh b/t/t3510-cherry-pick-sequence.sh
index e80050e1fef9c7c2d83a34aaa671415ea168e8c4..1820a424e97a2c8fafb9ba174c57ddc20c28ad2f 100755 (executable)
--- a/t/t3510-cherry-pick-sequence.sh
+++ b/t/t3510-cherry-pick-sequence.sh
@@ -14,6 +14,9 @@ test_description='Test cherry-pick continuation features
 
 . ./test-lib.sh
 
+# Repeat first match 10 times
+_r10='\1\1\1\1\1\1\1\1\1\1'
+
 pristine_detach () {
        git cherry-pick --quit &&
        git checkout -f "$1^0" &&
@@ -478,4 +481,29 @@ test_expect_success 'empty commit set' '
        test_expect_code 128 git cherry-pick base..base
 '
 
+test_expect_success 'malformed instruction sheet 3' '
+       pristine_detach initial &&
+       test_must_fail git cherry-pick base..anotherpick &&
+       echo "resolved" >foo &&
+       git add foo &&
+       git commit &&
+       sed "s/pick \([0-9a-f]*\)/pick $_r10/" .git/sequencer/todo >new_sheet &&
+       cp new_sheet .git/sequencer/todo &&
+       test_must_fail git cherry-pick --continue
+'
+
+test_expect_success 'commit descriptions in insn sheet are optional' '
+       pristine_detach initial &&
+       test_must_fail git cherry-pick base..anotherpick &&
+       echo "c" >foo &&
+       git add foo &&
+       git commit &&
+       cut -d" " -f1,2 .git/sequencer/todo >new_sheet &&
+       cp new_sheet .git/sequencer/todo &&
+       git cherry-pick --continue &&
+       test_path_is_missing .git/sequencer &&
+       git rev-list HEAD >commits &&
+       test_line_count = 4 commits
+'
+
 test_done