annotate tests/test-bookmarks-current.t @ 24461:05ccfe6763f1

osutil: use getdirentriesattr on OS X if possible

This is a significant win for large repositories on OS X, especially with a
cold cache. Unfortunately we need to keep the lstat-based implementation around
for two reasons:

- Not all filesystems support this call.
- There's an edge case in which it's best to fall back to avoid a retry loop.
  More about this in the comments.

The below tests are all performed on a Mac with an SSD running OS X 10.9, on a
repository with over 200k files. The results are best of 5 with simulated
best-effort conditions.

The gains with a hot cache are pretty impressive: 'hg status' goes from 5.18
seconds to 3.79 seconds.

However, a repository that large will probably already be using something like
hgwatchman [1], which helps much more (for this repo, 'hg status' with
hgwatchman is approximately 1 second). Where this really helps is when the
cache is cold [2]: hg status goes from 31.0 seconds to 9.66.

See http://lists.apple.com/archives/filesystem-dev/2014/Dec/msg00002.html for
some more discussion about this function.

This is based on a patch by Sean Farley <[e-mail]>.

[1] https://bitbucket.org/facebook/hgwatchman

[2] There appears to be no easy way to clear the file cache (aka "vnodes") on
OS X short of rebooting. purge(8) purportedly does that but in my testing had
little effect. The workaround I came up with was to assume that vnode eviction
was LRU, make sure the kern.maxvnodes sysctl is smaller than the size of the
repository, then make sure we'd always miss the cache by running 'hg status' in
another clone of the repository before running it in the test repository.

  $ hg init

no bookmarks

  $ hg bookmarks
  no bookmarks set

set bookmark X

  $ hg bookmark X

list bookmarks

  $ hg bookmark
   * X                         -1:000000000000

list bookmarks with color

  $ hg --config extensions.color= --config color.mode=ansi \
  >     bookmark --color=always
  \x1b[0;32m * \x1b[0m\x1b[0;32mX\x1b[0m\x1b[0;32m                         -1:000000000000\x1b[0m (esc)

update to bookmark X

  $ hg update X
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark X)

list bookmarks

  $ hg bookmarks
   * X                         -1:000000000000

rename

  $ hg bookmark -m X Z

list bookmarks

  $ cat .hg/bookmarks.current
  Z (no-eol)
  $ cat .hg/bookmarks
  0000000000000000000000000000000000000000 Z
  $ hg bookmarks
   * Z                         -1:000000000000

new bookmarks X and Y, first one made active

  $ hg bookmark Y X

list bookmarks

  $ hg bookmark
     X                         -1:000000000000
   * Y                         -1:000000000000
     Z                         -1:000000000000

  $ hg bookmark -d X

commit

  $ echo 'b' > b
  $ hg add b
  $ hg commit -m'test'

list bookmarks

  $ hg bookmark
   * Y                         0:719295282060
     Z                         -1:000000000000

Verify that switching to Z updates the current bookmark:
  $ hg update Z
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (activating bookmark Z)
  $ hg bookmark
     Y                         0:719295282060
   * Z                         -1:000000000000

Switch back to Y for the remaining tests in this file:
  $ hg update Y
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark Y)

delete bookmarks

  $ hg bookmark -d Y
  $ hg bookmark -d Z

list bookmarks

  $ hg bookmark
  no bookmarks set

update to tip

  $ hg update tip
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved

set bookmark Y using -r . but make sure that the active
bookmark is not activated

  $ hg bookmark -r . Y

list bookmarks, Y should not be active

  $ hg bookmark
     Y                         0:719295282060

now, activate Y

  $ hg up -q Y

set bookmark Z using -i

  $ hg bookmark -r . -i Z
  $ hg bookmarks
   * Y                         0:719295282060
     Z                         0:719295282060

deactivate current bookmark using -i

  $ hg bookmark -i Y
  $ hg bookmarks
     Y                         0:719295282060
     Z                         0:719295282060

  $ hg up -q Y
  $ hg bookmark -i
  $ hg bookmarks
     Y                         0:719295282060
     Z                         0:719295282060
  $ hg bookmark -i
  no active bookmark
  $ hg up -q Y
  $ hg bookmarks
   * Y                         0:719295282060
     Z                         0:719295282060

deactivate current bookmark while renaming

  $ hg bookmark -i -m Y X
  $ hg bookmarks
     X                         0:719295282060
     Z                         0:719295282060

bare update moves the active bookmark forward and clear the divergent bookmarks

  $ echo a > a
  $ hg ci -Am1
  adding a
  $ echo b >> a
  $ hg ci -Am2
  $ hg bookmark X@1 -r 1
  $ hg bookmark X@2 -r 2
  $ hg update X
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (activating bookmark X)
  $ hg bookmarks
   * X                         0:719295282060
     X@1                       1:cc586d725fbe
     X@2                       2:49e1c4e84c58
     Z                         0:719295282060
  $ hg update
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updating bookmark X
  $ hg bookmarks
   * X                         2:49e1c4e84c58
     Z                         0:719295282060

test deleting .hg/bookmarks.current when explicitly updating
to a revision

  $ echo a >> b
  $ hg ci -m.
  $ hg up -q X
  $ test -f .hg/bookmarks.current

try to update to it again to make sure we don't
set and then unset it

  $ hg up -q X
  $ test -f .hg/bookmarks.current

  $ hg up -q 1
  $ test -f .hg/bookmarks.current
  [1]

when a bookmark is active, hg up -r . is
analogous to hg book -i <active bookmark>

  $ hg up -q X
  $ hg up -q .
  $ test -f .hg/bookmarks.current
  [1]