diff options
| -rw-r--r-- | Documentation/git-update-index.txt | 10 | ||||
| -rw-r--r-- | Documentation/technical/index-format.txt | 6 | ||||
| -rw-r--r-- | read-cache.c | 2 |
3 files changed, 13 insertions, 5 deletions
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt index 77a912d4e..c92775829 100644 --- a/Documentation/git-update-index.txt +++ b/Documentation/git-update-index.txt @@ -145,7 +145,15 @@ you will need to handle the situation manually. --index-version <n>:: Write the resulting index out in the named on-disk format version. - The current default version is 2. + Supported versions are 2, 3 and 4. The current default version is 2 + or 3, depending on whether extra features are used, such as + `git add -N`. ++ +Version 4 performs a simple pathname compression that reduces index +size by 30%-50% on large repositories, which results in faster load +time. Version 4 is relatively young (first released in in 1.8.0 in +October 2012). Other Git implementations such as JGit and libgit2 +may not support it yet. -z:: Only meaningful with `--stdin` or `--index-info`; paths are diff --git a/Documentation/technical/index-format.txt b/Documentation/technical/index-format.txt index 27c716b15..0810251f5 100644 --- a/Documentation/technical/index-format.txt +++ b/Documentation/technical/index-format.txt @@ -12,7 +12,7 @@ Git index format The signature is { 'D', 'I', 'R', 'C' } (stands for "dircache") 4-byte version number: - The current supported versions are 2 and 3. + The current supported versions are 2, 3 and 4. 32-bit number of index entries. @@ -93,8 +93,8 @@ Git index format 12-bit name length if the length is less than 0xFFF; otherwise 0xFFF is stored in this field. - (Version 3) A 16-bit field, only applicable if the "extended flag" - above is 1, split into (high to low bits). + (Version 3 or later) A 16-bit field, only applicable if the + "extended flag" above is 1, split into (high to low bits). 1-bit reserved for future diff --git a/read-cache.c b/read-cache.c index 827ae55c5..670a06bc7 100644 --- a/read-cache.c +++ b/read-cache.c @@ -1260,7 +1260,7 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size) if (hdr->hdr_signature != htonl(CACHE_SIGNATURE)) return error("bad signature"); hdr_version = ntohl(hdr->hdr_version); - if (hdr_version < 2 || 4 < hdr_version) + if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version) return error("bad index version %d", hdr_version); git_SHA1_Init(&c); git_SHA1_Update(&c, hdr, size - 20); |