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Bump the version for release
v0.14.0-alpha3
2018-02-20, Gary Kramlich
166a6d1979fa
Bump the version for release
// Convey
// Copyright 2016-2018 Gary Kramlich <grim@reaperworld.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// Package path provides utilities for handling filesystem paths.
package
path
import
(
"fmt"
"os"
"path/filepath"
"strings"
)
// Traverses check whether path traverses outside of root. Returns error if
// root is traversed.
func
Traverses
(
root
,
path
string
)
(
string
,
error
)
{
if
path
==
"."
{
return
root
,
nil
}
if
!
filepath
.
IsAbs
(
path
)
{
path
=
filepath
.
Join
(
root
,
path
)
}
realPath
,
err
:=
filepath
.
EvalSymlinks
(
path
)
if
err
!=
nil
{
return
""
,
err
}
if
!
strings
.
HasPrefix
(
realPath
,
root
)
{
return
""
,
fmt
.
Errorf
(
"'%s' is outside of the build context '%s'"
,
path
,
root
)
}
return
realPath
,
nil
}
// TraversesNonExistent works like Traverses but will walk up the path until it
// finds a directory that does exist.
func
TraversesNonExistent
(
root
,
path
string
)
(
string
,
error
)
{
// attempt to do a normal traversal
realPath
,
err
:=
Traverses
(
root
,
path
)
// if it failed with a os.PathError that means the path doesn't exist.
// so we will strip off the filename and walk up to see if we can still
// find a match.
if
_
,
ok
:=
err
.(
*
os
.
PathError
);
ok
{
// reset realPath as the original call to Traverses will return an
// empty string for it on error
realPath
=
path
// create a variable to hold the path that we've removed
stripped
:=
""
i
:=
0
for
{
// split the directory and file name, we only hit this on error,
// so we can't actually eval symlinks completely, so it's safe-ish
// to split.
dir
,
file
:=
filepath
.
Split
(
realPath
)
if
file
==
""
{
dir
=
filepath
.
Dir
(
dir
)
file
=
filepath
.
Base
(
dir
)
}
// join the filename to the beginning for stripped as we're walking
// up the directory tree.
stripped
=
filepath
.
Join
(
file
,
stripped
)
// call Traverses again
realPath
,
err
=
Traverses
(
root
,
dir
)
// if there was no error, we're done
if
err
==
nil
{
return
filepath
.
Join
(
realPath
,
stripped
),
nil
}
realPath
=
dir
i
++
if
i
>=
10
{
break
}
}
}
else
if
err
!=
nil
{
return
""
,
err
}
return
realPath
,
nil
}