Mercurial > hg
diff mercurial/helptext/internals/dirstate-v2.txt @ 48195:4d5a13253d34
dirstate-v2: Replace the 32-bit `mode` field with two bits
Previously we stored the entire value from `stat_result.st_mode`,
like dirstate-v1 does. However only the executable permission
and type of file (only symbolic links and normal files are supported)
are relevant to Mecurial.
So replace this field with two bits in the existing bitfield byte.
For now the unused space is left as padding, as it will be used
for something else soon.
Differential Revision: https://phab.mercurial-scm.org/D11635
author | Simon Sapin <simon.sapin@octobus.net> |
---|---|
date | Tue, 12 Oct 2021 17:57:57 +0200 |
parents | 320de901896a |
children | 308d9c245337 |
line wrap: on
line diff
--- a/mercurial/helptext/internals/dirstate-v2.txt Mon Oct 11 18:37:21 2021 +0200 +++ b/mercurial/helptext/internals/dirstate-v2.txt Tue Oct 12 17:57:57 2021 +0200 @@ -380,6 +380,9 @@ P2_INFO = 1 << 2 HAS_MODE_AND_SIZE = 1 << 3 HAS_MTIME = 1 << 4 + MODE_EXEC_PERM = 1 << 5 + MODE_IS_SYMLINK = 1 << 7 + Other bits are unset. The meaning of these bits are: @@ -414,14 +417,17 @@ in order to optimize `hg status` by enabling it to skip `readdir` in more cases. - When a node is for a file tracked anywhere, - the rest of the node data is three fields: + When a node is for a file tracked anywhere: + - If `HAS_MODE_AND_SIZE` is set, the file is expected + to be a symbolic link or a normal file based on `MODE_IS_SYMLINK`. + - If `HAS_MODE_AND_SIZE` is set, the file’s owner is expected + to have execute permission or not based on `MODE_EXEC_PERM`. + - If `HAS_MODE_AND_SIZE` is unset, + the expected type of file and permission are unknown. + The rest of the node data is three fields: * Offset 31: - If `HAS_MODE_AND_SIZE` is unset, four zero bytes. - Otherwise, a 32-bit integer for the Unix mode (as in `stat_result.st_mode`) - expected for this file to be considered clean. - Only the `S_IXUSR` bit (owner has execute permission) is considered. + 4 unused bytes, set to zero * Offset 35: If `HAS_MODE_AND_SIZE` is unset, four zero bytes.