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 no-windows

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  $ . "$TESTDIR/remotefilelog-library.sh"

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  $ hg init master

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  $ cd master

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  $ cat >> .hg/hgrc <<EOF

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  > [remotefilelog]

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  > server=True

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  > EOF

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  $ echo x > x

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  $ hg commit -qAm x

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  $ cd ..

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  $ hgcloneshallow ssh://user@dummy/master shallow -q

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  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)

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  $ cd master

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  $ echo xx > x

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  $ hg commit -qAm x2

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  $ cd ..

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# Test cache misses with read only permissions on server

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  $ chmod -R a-w master/.hg/remotefilelogcache

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  $ cd shallow

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  $ hg pull -q

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  $ hg update

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

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  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)

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  $ cd ..

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  $ chmod -R u+w master/.hg/remotefilelogcache

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#if suidbit

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# Test setting up shared cache with the right permissions

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# (this is hard to test in a cross platform way, so we just make sure nothing

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# crashes)

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  $ rm -rf $CACHEDIR

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  $ umask 002

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  $ mkdir $CACHEDIR

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  $ hg -q clone --shallow ssh://user@dummy/master shallow2 --config remotefilelog.cachegroup="`id -g -n`"

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  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob)

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  $ ls -ld $CACHEDIR/11

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  drwxrws* $TESTTMP/hgcache/11 (glob)

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#endif