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4235784907
Summary:
It's not really magic because we don't have a virtual directory
inode base any more. Instead, we mkdir and populate it at mount time.
What is slightly magical about it is that we give it some special powers:
* We know the inode number of the eden dir and prevent unlink operations
on it or inside it.
* The .eden dir is present in the contents of the root inode and will
show up when that directory is `readdir`'d
* When resolving a child of a TreeInode by name, we know to return the
magic `.eden` inode number. This means that it is possible to `stat`
and consume the `.eden` directory from any directory inside the eden
mount, even though it won't show up in `readdir` for those child dirs.
The contents of the `.eden` dir are:
* `socket` - a symlink back to the unix domain socket that our thrift
server is listening on. This means that it is a simple
`readlink(".eden/socket")` operation to discover both whether a directory
is part of an eden mount and how to talk to the server.
* `root` - a symlink back to the root of this eden mount. This allows
using `readlink(".eden/root")` as a simple 1-step operation to find
the root of an eden mount, and avoids needing to walk up directory
by directory as is the common pattern for locating `.hg` or `.git`
dirs.
Reviewed By: simpkins
Differential Revision: D4637285
fbshipit-source-id: 0eabf98b29144acccef5c83bd367493399dc55bb
49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (c) 2016-present, Facebook, Inc.
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# All rights reserved.
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#
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# This source code is licensed under the BSD-style license found in the
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# LICENSE file in the root directory of this source tree. An additional grant
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# of patent rights can be found in the PATENTS file in the same directory.
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import os
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import stat
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import hypothesis
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from .lib import testcase
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@testcase.eden_repo_test
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class HypothesisSimpleTest:
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def populate_repo(self):
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self.repo.write_file('hello', 'hola\n')
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self.repo.write_file('adir/file', 'foo!\n')
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self.repo.write_file('bdir/test.sh', '#!/bin/bash\necho test\n',
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mode=0o755)
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self.repo.write_file('bdir/noexec.sh', '#!/bin/bash\necho test\n')
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self.repo.symlink('slink', 'hello')
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self.repo.commit('Initial commit.')
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@hypothesis.given(testcase.FILENAME_STRATEGY)
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def test_create(self, basename):
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filename = os.path.join(self.mount, basename)
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# Ensure that we don't proceed if hypothesis has selected a name that
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# conflicts with the names we generated in the repo.
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hypothesis.assume(not os.path.exists(filename))
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with open(filename, 'w') as f:
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f.write('created\n')
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entries = sorted(os.listdir(self.mount))
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self.assertEqual(
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sorted(['.eden', 'adir', 'bdir', 'hello', basename, 'slink']),
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entries)
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with open(filename, 'r') as f:
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self.assertEqual(f.read(), 'created\n')
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st = os.lstat(filename)
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self.assertEqual(st.st_size, 8)
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self.assertTrue(stat.S_ISREG(st.st_mode))
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