From e228c1736f25c59cd6da51ed97e03ecd80a935e6 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 27 Dec 2013 21:49:57 +0100 Subject: [PATCH] Remove the line length limit for graft files Support for grafts predates Git's strbuf, and hence it is understandable that there was a hard-coded line length limit of 1023 characters (which was chosen a bit awkwardly, given that it is *exactly* one byte short of aligning with the 41 bytes occupied by a commit name and the following space or new-line character). While regular commit histories hardly win comprehensibility in general if they merge more than twenty-two branches in one go, it is not Git's business to limit grafts in such a way. In this particular developer's case, the use case that requires substantially longer graft lines to be supported is the visualization of the commits' order implied by their changes: commits are considered to have an implicit relationship iff exchanging them in an interactive rebase would result in merge conflicts. Thusly implied branches tend to be very shallow in general, and the resulting thicket of implied branches is usually very wide; It is actually quite common that *most* of the commits in a topic branch have not even one implied parent, so that a final merge commit has about as many implied parents as there are commits in said branch. [jc: squashed in tests by Jonathan] Signed-off-by: Johannes Schindelin Reviewed-by: Jonathan Nieder Signed-off-by: Junio C Hamano --- builtin/blame.c | 8 ++++---- commit.c | 10 +++++----- t/annotate-tests.sh | 21 +++++++++++++++++++++ t/t6101-rev-parse-parents.sh | 16 +++++++++++++++- 4 files changed, 45 insertions(+), 10 deletions(-) diff --git a/builtin/blame.c b/builtin/blame.c index 1407ae7eb2..9047b6ef4c 100644 --- a/builtin/blame.c +++ b/builtin/blame.c @@ -1804,17 +1804,17 @@ static int prepare_lines(struct scoreboard *sb) static int read_ancestry(const char *graft_file) { FILE *fp = fopen(graft_file, "r"); - char buf[1024]; + struct strbuf buf = STRBUF_INIT; if (!fp) return -1; - while (fgets(buf, sizeof(buf), fp)) { + while (!strbuf_getwholeline(&buf, fp, '\n')) { /* The format is just "Commit Parent1 Parent2 ...\n" */ - int len = strlen(buf); - struct commit_graft *graft = read_graft_line(buf, len); + struct commit_graft *graft = read_graft_line(buf.buf, buf.len); if (graft) register_commit_graft(graft, 0); } fclose(fp); + strbuf_release(&buf); return 0; } diff --git a/commit.c b/commit.c index de16a3c0a2..57ebea2aee 100644 --- a/commit.c +++ b/commit.c @@ -196,19 +196,19 @@ bad_graft_data: static int read_graft_file(const char *graft_file) { FILE *fp = fopen(graft_file, "r"); - char buf[1024]; + struct strbuf buf = STRBUF_INIT; if (!fp) return -1; - while (fgets(buf, sizeof(buf), fp)) { + while (!strbuf_getwholeline(&buf, fp, '\n')) { /* The format is just "Commit Parent1 Parent2 ...\n" */ - int len = strlen(buf); - struct commit_graft *graft = read_graft_line(buf, len); + struct commit_graft *graft = read_graft_line(buf.buf, buf.len); if (!graft) continue; if (register_commit_graft(graft, 1)) - error("duplicate graft data: %s", buf); + error("duplicate graft data: %s", buf.buf); } fclose(fp); + strbuf_release(&buf); return 0; } diff --git a/t/annotate-tests.sh b/t/annotate-tests.sh index c9d105d707..304c7b7d87 100644 --- a/t/annotate-tests.sh +++ b/t/annotate-tests.sh @@ -116,6 +116,27 @@ test_expect_success 'blame evil merge' ' check_count A 2 B 1 B1 2 B2 1 "A U Thor" 1 ' +test_expect_success 'blame huge graft' ' + test_when_finished "git checkout branch2" && + test_when_finished "rm -f .git/info/grafts" && + graft= && + for i in 0 1 2 + do + for j in 0 1 2 3 4 5 6 7 8 9 + do + git checkout --orphan "$i$j" && + printf "%s\n" "$i" "$j" >file && + test_tick && + GIT_AUTHOR_NAME=$i$j GIT_AUTHOR_EMAIL=$i$j@test.git \ + git commit -a -m "$i$j" && + commit=$(git rev-parse --verify HEAD) && + graft="$graft$commit " + done + done && + printf "%s " $graft >.git/info/grafts && + check_count -h 00 01 1 10 1 +' + test_expect_success 'setup incomplete line' ' echo "incomplete" | tr -d "\\012" >>file && GIT_AUTHOR_NAME="C" GIT_AUTHOR_EMAIL="C@test.git" \ diff --git a/t/t6101-rev-parse-parents.sh b/t/t6101-rev-parse-parents.sh index 7ea14ced31..10b1452766 100755 --- a/t/t6101-rev-parse-parents.sh +++ b/t/t6101-rev-parse-parents.sh @@ -20,7 +20,17 @@ test_expect_success 'setup' ' test_commit start2 && git checkout master && git merge -m next start2 && - test_commit final + test_commit final && + + test_seq 40 | + while read i + do + git checkout --orphan "b$i" && + test_tick && + git commit --allow-empty -m "$i" && + commit=$(git rev-parse --verify HEAD) && + printf "$commit " >>.git/info/grafts + done ' test_expect_success 'start is valid' ' @@ -79,6 +89,10 @@ test_expect_success 'final^1^! = final^1 ^final^1^1 ^final^1^2' ' test_cmp expect actual ' +test_expect_success 'large graft octopus' ' + test_cmp_rev_output b31 "git rev-parse --verify b1^30" +' + test_expect_success 'repack for next test' ' git repack -a -d '