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429979a442
This patch adds the symlinkat(2) and readlinkat(2) system calls which are not exposed in golang 1.6. The implementation uses syscall.Syscall along with syscall.SYS_SYMLINKAT and SYS_READLINKAT which are, fortunately, available. Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2018 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package osutil_test
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import (
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"os"
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"path/filepath"
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"syscall"
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. "gopkg.in/check.v1"
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"github.com/snapcore/snapd/osutil"
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)
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type sysSuite struct{}
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var _ = Suite(&sysSuite{})
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func (s *sysSuite) TestSymlinkatAndReadlinkat(c *C) {
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// Create and open a temporary directory.
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d := c.MkDir()
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fd, err := syscall.Open(d, syscall.O_DIRECTORY, 0)
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c.Assert(err, IsNil)
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defer syscall.Close(fd)
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// Create a symlink relative to the directory file descriptor.
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err = osutil.Symlinkat("target", fd, "linkpath")
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c.Assert(err, IsNil)
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// Ensure that the created file is a symlink.
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fname := filepath.Join(d, "linkpath")
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fi, err := os.Lstat(fname)
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c.Assert(err, IsNil)
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c.Assert(fi.Name(), Equals, "linkpath")
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c.Assert(fi.Mode()&os.ModeSymlink, Equals, os.ModeSymlink)
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// Ensure that the symlink target is correct.
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target, err := os.Readlink(fname)
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c.Assert(err, IsNil)
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c.Assert(target, Equals, "target")
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// Use readlinkat with a buffer that fits only part of the target path.
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buf := make([]byte, 2)
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n, err := osutil.Readlinkat(fd, "linkpath", buf)
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c.Assert(err, IsNil)
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c.Assert(n, Equals, 2)
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c.Assert(buf, DeepEquals, []byte{'t', 'a'})
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// Use a buffer that fits all of the target path.
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buf = make([]byte, 100)
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n, err = osutil.Readlinkat(fd, "linkpath", buf)
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c.Assert(err, IsNil)
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c.Assert(n, Equals, len("target"))
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c.Assert(buf[:n], DeepEquals, []byte{'t', 'a', 'r', 'g', 'e', 't'})
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}
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