status: prefer relative paths in Rust code … when the repository root is under the current directory, so the kernel needs to traverse fewer directory in every call to `read_dir` or `symlink_metadata`. Better yet would be to use libc functions like `openat` and `fstatat` to remove such repeated traversals entirely, but the standard library does not provide APIs based on those. Maybe with a crate like https://crates.io/crates/openat instead? Benchmarks of `rhg status` show that this patch is neutral in some configurations, and makes the command up to ~20% faster in others. Below is semi-arbitrary subset of results. The four numeric columns are: time (in seconds) with this changeset’s parent, time with this changeset, time difference (negative is better), time ratio (less than 1 is better). ``` mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97) mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97) mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00) mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82) mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82) mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96) mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95) mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78) mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81) mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78) mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82) mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96) mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98) mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82) mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82) netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99) netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87) ``` Differential Revision: https://phab.mercurial-scm.org/D12175

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#require execbit

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Create extension that can disable exec checks:

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  $ cat > noexec.py <<EOF

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  > from mercurial import extensions, util

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  > def setflags(orig, f, l, x):

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  >     pass

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  > def checkexec(orig, path):

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  >     return False

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  > def extsetup(ui):

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  >     extensions.wrapfunction(util, 'setflags', setflags)

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  >     extensions.wrapfunction(util, 'checkexec', checkexec)

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  > EOF

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  $ hg init unix-repo

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  $ cd unix-repo

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  $ touch a

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  $ hg add a

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  $ hg commit -m 'unix: add a'

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  $ hg clone . ../win-repo

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  updating to branch default

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ chmod +x a

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  $ hg commit -m 'unix: chmod a'

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  $ hg manifest -v

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  755 * a

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  $ cd ../win-repo

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  $ touch b

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  $ hg add b

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  $ hg commit -m 'win: add b'

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  $ hg manifest -v

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  644   a

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  644   b

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  $ hg pull

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  pulling from $TESTTMP/unix-repo

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  searching for changes

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  adding changesets

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  adding manifests

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  adding file changes

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  added 1 changesets with 0 changes to 0 files (+1 heads)

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  new changesets 2d8bcf2dda39

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  (run 'hg heads' to see heads, 'hg merge' to merge)

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  $ hg manifest -v -r tip

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  755 * a

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Simulate a Windows merge:

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  $ hg --config extensions.n=$TESTTMP/noexec.py merge --debug

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  resolving manifests

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   branchmerge: True, force: False, partial: False

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   ancestor: a03b0deabf2b, local: d6fa54f68ae1+, remote: 2d8bcf2dda39

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   a: update permissions -> e

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  (branch merge, don't forget to commit)

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Simulate a Windows commit:

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  $ hg --config extensions.n=$TESTTMP/noexec.py commit -m 'win: merge'

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  $ hg manifest -v

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  755 * a

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  644   b

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  $ cd ..