Mercurial > hg
view tests/test-pull-branch.t @ 27430:e240e914d226 stable
revlog: seek to end of file before writing (issue4943)
Revlogs were recently refactored to open file handles in "a+" and use a
persistent file handle for reading and writing. This drastically
reduced the number of file handles being opened.
Unfortunately, it appears that some versions of Solaris lose the file
offset when performing a write after the handle has been seeked.
The simplest workaround is to seek to EOF on files opened in a+ mode
before writing to them, which is what this patch does.
Ideally, this code would exist in the vfs layer. However, this would
require creating a proxy class for file objects in order to provide a
custom implementation of write(). This would add overhead. Since
revlogs are the only files we open in a+ mode, the one-off workaround
in revlog.py should be sufficient.
This patch appears to have little to no impact on performance on my
Linux machine.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Thu, 17 Dec 2015 17:16:02 -0800 |
parents | 701df761aa94 |
children | ca2a0a654f54 |
line wrap: on
line source
$ hg init t $ cd t $ echo 1 > foo $ hg ci -Am1 # 0 adding foo $ hg branch branchA marked working directory as branch branchA (branches are permanent and global, did you want a bookmark?) $ echo a1 > foo $ hg ci -ma1 # 1 $ cd .. $ hg init tt $ cd tt $ hg pull ../t pulling from ../t requesting all changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files (run 'hg update' to get a working copy) $ hg up branchA 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd ../t $ echo a2 > foo $ hg ci -ma2 # 2 Create branch B: $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch branchB marked working directory as branch branchB $ echo b1 > foo $ hg ci -mb1 # 3 $ cd ../tt A new branch is there $ hg pull -u ../t pulling from ../t searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files (+1 heads) 1 files updated, 0 files merged, 0 files removed, 0 files unresolved Develop both branches: $ cd ../t $ hg up branchA 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a3 > foo $ hg ci -ma3 # 4 $ hg up branchB 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b2 > foo $ hg ci -mb2 # 5 $ cd ../tt Should succeed, no new heads: $ hg pull -u ../t pulling from ../t searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files 1 files updated, 0 files merged, 0 files removed, 0 files unresolved Add a head on other branch: $ cd ../t $ hg up branchA 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a4 > foo $ hg ci -ma4 # 6 $ hg up branchB 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b3.1 > foo $ hg ci -m b3.1 # 7 $ hg up 5 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b3.2 > foo $ hg ci -m b3.2 # 8 created new head $ cd ../tt Should succeed because there is only one head on our branch: $ hg pull -u ../t pulling from ../t searching for changes adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files (+1 heads) 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd ../t $ hg up -C branchA 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a5.1 > foo $ hg ci -ma5.1 # 9 $ hg up 6 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a5.2 > foo $ hg ci -ma5.2 # 10 created new head $ hg up 7 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b4.1 > foo $ hg ci -m b4.1 # 11 $ hg up -C 8 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b4.2 > foo $ hg ci -m b4.2 # 12 $ cd ../tt $ hg pull -u ../t pulling from ../t searching for changes adding changesets adding manifests adding file changes added 4 changesets with 4 changes to 1 files (+1 heads) 1 files updated, 0 files merged, 0 files removed, 0 files unresolved Make changes on new branch on tt $ hg up 6 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch branchC marked working directory as branch branchC $ echo b1 > bar $ hg ci -Am "commit on branchC on tt" adding bar Make changes on default branch on t $ cd ../t $ hg up -C default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a1 > bar $ hg ci -Am "commit on default on t" adding bar Pull branchC from tt $ hg pull ../tt pulling from ../tt searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) (run 'hg heads' to see heads) Make changes on default and branchC on tt $ cd ../tt $ hg pull ../t pulling from ../t searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) (run 'hg heads' to see heads) $ hg up -C default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a1 > bar1 $ hg ci -Am "commit on default on tt" adding bar1 $ hg up branchC 2 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo a1 > bar2 $ hg ci -Am "commit on branchC on tt" adding bar2 Make changes on default and branchC on t $ cd ../t $ hg up default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo a1 > bar3 $ hg ci -Am "commit on default on t" adding bar3 $ hg up branchC 2 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo a1 > bar4 $ hg ci -Am "commit on branchC on tt" adding bar4 Pull from tt $ hg pull ../tt pulling from ../tt searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 2 files (+2 heads) (run 'hg heads .' to see heads, 'hg merge' to merge) $ cd ..