tests/test-symlink-os-yes-fs-no.py
author Mads Kiilerich <madski@unity3d.com>
Wed, 14 Jan 2015 01:15:26 +0100
changeset 30448 8836f13e3c5b
parent 28916 3b453513f1fe
child 30559 d83ca854fa21
permissions -rw-r--r--
posix: give checklink a fast path that cache the check file and is read only util.checklink would create a symlink and remove it again. That would sometimes happen multiple times. Write operations are relatively expensive and give disk tear and noise for applications monitoring file system activity. Instead of creating a symlink and deleting it again, just create it once and leave it in .hg/cache/check-link . If the file exists, just verify that os.islink reports true. We will assume that this check is as good as symlink creation not failing. Note: The symlink left in .hg/cache has to resolve to a file - otherwise 'make dist' will fail ... test-symlink-os-yes-fs-no.py does some monkey patching to simulate a platform without symlink support. The slightly different testing method requires additional monkeying.
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from __future__ import absolute_import
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import os
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import sys
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import time
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from mercurial import (
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    commands,
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    hg,
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    ui as uimod,
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    util,
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)
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TESTDIR = os.environ["TESTDIR"]
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BUNDLEPATH = os.path.join(TESTDIR, 'bundles', 'test-no-symlinks.hg')
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# only makes sense to test on os which supports symlinks
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if not getattr(os, "symlink", False):
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    sys.exit(80) # SKIPPED_STATUS defined in run-tests.py
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u = uimod.ui()
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# hide outer repo
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hg.peer(u, {}, '.', create=True)
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# clone with symlink support
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hg.clone(u, {}, BUNDLEPATH, 'test0')
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repo = hg.repository(u, 'test0')
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# wait a bit, or the status call wont update the dirstate
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time.sleep(1)
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commands.status(u, repo)
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# now disable symlink support -- this is what os.symlink would do on a
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# non-symlink file system
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def symlink_failure(src, dst):
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    raise OSError(1, "Operation not permitted")
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os.symlink = symlink_failure
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def islink_failure(path):
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    return False
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os.path.islink = islink_failure
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# dereference links as if a Samba server has exported this to a
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# Windows client
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for f in 'test0/a.lnk', 'test0/d/b.lnk':
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    os.unlink(f)
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    fp = open(f, 'wb')
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    fp.write(util.readfile(f[:-4]))
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    fp.close()
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# reload repository
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u = uimod.ui()
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repo = hg.repository(u, 'test0')
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commands.status(u, repo)
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# try cloning a repo which contains symlinks
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u = uimod.ui()
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hg.clone(u, {}, BUNDLEPATH, 'test1')