From 7d7ff15b39abfa9e73b6475f189006a74dc26376 Mon Sep 17 00:00:00 2001 From: =?utf8?q?SZEDER=20G=C3=A1bor?= Date: Tue, 13 Jul 2010 01:42:04 +0200 Subject: [PATCH] rerere: fix overeager gc MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 'rerere gc' prunes resolutions of conflicted merges that occurred long time ago, and when doing so it takes the creation time of the conflicted automerge results into account. This can cause the loss of frequently used conflict resolutions (e.g. long-living topic branches are merged into a regularly rebuilt integration branch (think of git's pu)) when they become old enough to exceed 'rerere gc's threshold. To prevent the loss of valuable merge resolutions 'rerere' will (1) update the timestamp of the recorded conflict resolution (i.e. 'postimage') each time when encountering and resolving the same merge conflict, and (2) take this timestamp, i.e. the time of the last usage into account when gc'ing. Signed-off-by: SZEDER Gábor Signed-off-by: Junio C Hamano --- builtin/rerere.c | 21 ++++++++++++++++----- rerere.c | 8 +++++++- t/t4200-rerere.sh | 14 +++++++++++--- 3 files changed, 34 insertions(+), 9 deletions(-) diff --git a/builtin/rerere.c b/builtin/rerere.c index 0048f9ef7..6d1b5802a 100644 --- a/builtin/rerere.c +++ b/builtin/rerere.c @@ -19,6 +19,12 @@ static time_t rerere_created_at(const char *name) return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime; } +static time_t rerere_last_used_at(const char *name) +{ + struct stat st; + return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime; +} + static void unlink_rr_item(const char *name) { unlink(rerere_path(name, "thisimage")); @@ -53,11 +59,16 @@ static void garbage_collect(struct string_list *rr) while ((e = readdir(dir))) { if (is_dot_or_dotdot(e->d_name)) continue; - then = rerere_created_at(e->d_name); - if (!then) - continue; - cutoff = (has_rerere_resolution(e->d_name) - ? cutoff_resolve : cutoff_noresolve); + + then = rerere_last_used_at(e->d_name); + if (then) { + cutoff = cutoff_resolve; + } else { + then = rerere_created_at(e->d_name); + if (!then) + continue; + cutoff = cutoff_noresolve; + } if (then < now - cutoff * 86400) string_list_append(e->d_name, &to_remove); } diff --git a/rerere.c b/rerere.c index f221bed1e..a6f6681e1 100644 --- a/rerere.c +++ b/rerere.c @@ -378,7 +378,13 @@ static int merge(const char *name, const char *path) } ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", 0); if (!ret) { - FILE *f = fopen(path, "w"); + FILE *f; + + if (utime(rerere_path(name, "postimage"), NULL) < 0) + warning("failed utime() on %s: %s", + rerere_path(name, "postimage"), + strerror(errno)); + f = fopen(path, "w"); if (!f) return error("Could not open %s: %s", path, strerror(errno)); diff --git a/t/t4200-rerere.sh b/t/t4200-rerere.sh index 70856d07e..093b13891 100755 --- a/t/t4200-rerere.sh +++ b/t/t4200-rerere.sh @@ -132,6 +132,8 @@ test_expect_success 'commit succeeds' \ test_expect_success 'recorded postimage' "test -f $rr/postimage" +oldmtimepost=$(test-chmtime -v -60 $rr/postimage |cut -f 1) + test_expect_success 'another conflicting merge' ' git checkout -b third master && git show second^:a1 | sed "s/To die: t/To die! T/" > a1 && @@ -144,6 +146,11 @@ test_expect_success 'rerere kicked in' "! grep ^=======$ a1" test_expect_success 'rerere prefers first change' 'test_cmp a1 expect' +test_expect_success 'rerere updates postimage timestamp' ' + newmtimepost=$(test-chmtime -v +0 $rr/postimage |cut -f 1) && + test $oldmtimepost -lt $newmtimepost +' + rm $rr/postimage echo "$sha1 a1" | perl -pe 'y/\012/\000/' > .git/MERGE_RR @@ -165,15 +172,16 @@ just_over_15_days_ago=$((-1-15*86400)) almost_60_days_ago=$((60-60*86400)) just_over_60_days_ago=$((-1-60*86400)) -test-chmtime =$almost_60_days_ago $rr/preimage +test-chmtime =$just_over_60_days_ago $rr/preimage +test-chmtime =$almost_60_days_ago $rr/postimage test-chmtime =$almost_15_days_ago $rr2/preimage test_expect_success 'garbage collection (part1)' 'git rerere gc' -test_expect_success 'young records still live' \ +test_expect_success 'young or recently used records still live' \ "test -f $rr/preimage && test -f $rr2/preimage" -test-chmtime =$just_over_60_days_ago $rr/preimage +test-chmtime =$just_over_60_days_ago $rr/postimage test-chmtime =$just_over_15_days_ago $rr2/preimage test_expect_success 'garbage collection (part2)' 'git rerere gc' -- 2.30.2