forked from snapcore/snapd
/
xdg.go
56 lines (49 loc) · 1.72 KB
/
xdg.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 main
import (
"fmt"
"strings"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/osutil"
)
// xdgRuntimeDir returns the path to XDG_RUNTIME_DIR for a given user ID.
func xdgRuntimeDir(uid int) string {
return fmt.Sprintf("%s/%d", dirs.XdgRuntimeDirBase, uid)
}
// expandPrefixVariable expands variable at the beginning of a path-like string.
func expandPrefixVariable(path, variable, value string) string {
if strings.HasPrefix(path, variable) {
if len(path) == len(variable) {
return value
}
if len(path) > len(variable) && path[len(variable)] == '/' {
return value + path[len(variable):]
}
}
return path
}
// expandXdgRuntimeDir expands the $XDG_RUNTIME_DIR variable in the given mount profile.
func expandXdgRuntimeDir(profile *osutil.MountProfile, uid int) {
variable := "$XDG_RUNTIME_DIR"
value := xdgRuntimeDir(uid)
for i := range profile.Entries {
profile.Entries[i].Name = expandPrefixVariable(profile.Entries[i].Name, variable, value)
profile.Entries[i].Dir = expandPrefixVariable(profile.Entries[i].Dir, variable, value)
}
}