From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
The commit-graph builtin has an --expire-time option that takes a
datetime using OPT_EXPIRY_DATE(). However, the implementation inside
expire_commit_graphs() was treating a non-zero value as a number of
seconds to subtract from "now".
Update t5323-split-commit-graph.sh to demonstrate the correct value
of the --expire-time option by actually creating a crud .graph file
with mtime earlier than the expire time. Instead of using a super-
early time (1980) we need to use a recent time or else the old
logic actually passes by accident. This test will start passing
again on the old logic in 40 years or so.
I noticed this when inspecting some Scalar repos that had an excess
number of commit-graph files. In Scalar, we were using this second
interpretation by using "--expire-time=3600" to mean "delete graphs
older than one hour ago" to avoid deleting a commit-graph that a
foreground process may be trying to load.
Also I noticed that the help text was copied from the --max-commits
option. Fix that help text.
Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
commit-graph: fix buggy --expire-time option
This is embarassing. I should have noticed this when writing it the
first time, or when integrating the feature into Scalar and VFS for Git.
Sorry!
Thanks, -Stolee
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-596%2Fderrickstolee%2Fcommit-graph-expire-fix-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-596/derrickstolee/commit-graph-expire-fix-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/596
builtin/commit-graph.c | 2 +-
commit-graph.c | 2 +-
t/t5324-split-commit-graph.sh | 4 +++-
3 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 4a70b33fb5f..8000ff0d2ee 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -140,7 +140,7 @@ static int graph_write(int argc, const char **argv)
OPT_INTEGER(0, "size-multiple", &split_opts.size_multiple,
N_("maximum ratio between two levels of a split commit-graph")),
OPT_EXPIRY_DATE(0, "expire-time", &split_opts.expire_time,
- N_("maximum number of commits in a non-base split commit-graph")),
+ N_("do not expire files newer than a number of seconds before now")),
OPT_END(),
};
diff --git a/commit-graph.c b/commit-graph.c
index f013a84e294..0d0d37787a0 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1707,7 +1707,7 @@ static void expire_commit_graphs(struct write_commit_graph_context *ctx)
timestamp_t expire_time = time(NULL);
if (ctx->split_opts && ctx->split_opts->expire_time)
- expire_time -= ctx->split_opts->expire_time;
+ expire_time = ctx->split_opts->expire_time;
if (!ctx->split) {
char *chain_file_name = get_chain_filename(ctx->odb);
unlink(chain_file_name);
diff --git a/t/t5324-split-commit-graph.sh b/t/t5324-split-commit-graph.sh
index 53b2e6b4555..4e4efcaff22 100755
--- a/t/t5324-split-commit-graph.sh
+++ b/t/t5324-split-commit-graph.sh
@@ -210,8 +210,10 @@ test_expect_success 'test merge stragety constants' '
git config core.commitGraph true &&
test_line_count = 2 $graphdir/commit-graph-chain &&
test_commit 15 &&
- git commit-graph write --reachable --split --size-multiple=10 --expire-time=1980-01-01 &&
+ touch -m -t 201801010000.00 $graphdir/extra.graph &&
+ git commit-graph write --reachable --split --size-multiple=10 --expire-time=2019-01-01 &&
test_line_count = 1 $graphdir/commit-graph-chain &&
+ test_path_is_missing $graphdir/extra.graph &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 3 graph-files
) &&
base-commit: 274b9cc25322d9ee79aa8e6d4e86f0ffe5ced925
--
gitgitgadget
