diff options
| author | Taylor Blau <me@ttaylorr.com> | 2022-05-20 19:17:35 -0400 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2022-05-26 15:48:26 -0700 |
| commit | 94cd775a6c52a99caeb1278c3d8044ee109e2d3e (patch) | |
| tree | 82356eb7d022d44f0bc0a290f3ffc2685fdcebb2 /Documentation/technical | |
| parent | 3d89a8c11801af1f7aae9d009240fd43cf322845 (diff) | |
| download | git-94cd775a6c52a99caeb1278c3d8044ee109e2d3e.tar.gz | |
pack-mtimes: support reading .mtimes files
To store the individual mtimes of objects in a cruft pack, introduce a
new `.mtimes` format that can optionally accompany a single pack in the
repository.
The format is defined in Documentation/technical/pack-format.txt, and
stores a 4-byte network order timestamp for each object in name (index)
order.
This patch prepares for cruft packs by defining the `.mtimes` format,
and introducing a basic API that callers can use to read out individual
mtimes.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation/technical')
| -rw-r--r-- | Documentation/technical/pack-format.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/technical/pack-format.txt b/Documentation/technical/pack-format.txt index 6d3efb7d16..b520aa9c45 100644 --- a/Documentation/technical/pack-format.txt +++ b/Documentation/technical/pack-format.txt @@ -294,6 +294,25 @@ Pack file entry: <+ All 4-byte numbers are in network order. +== pack-*.mtimes files have the format: + +All 4-byte numbers are in network byte order. + + - A 4-byte magic number '0x4d544d45' ('MTME'). + + - A 4-byte version identifier (= 1). + + - A 4-byte hash function identifier (= 1 for SHA-1, 2 for SHA-256). + + - A table of 4-byte unsigned integers. The ith value is the + modification time (mtime) of the ith object in the corresponding + pack by lexicographic (index) order. The mtimes count standard + epoch seconds. + + - A trailer, containing a checksum of the corresponding packfile, + and a checksum of all of the above (each having length according + to the specified hash function). + == multi-pack-index (MIDX) files have the following format: The multi-pack-index files refer to multiple pack-files and loose objects. |