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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2022 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 (
"strings"
"github.com/snapcore/snapd/osutil"
)
// byOvernameAndMountPoint allows sorting an array of entries by the
// source of mount entry (whether it's an overname or not) and
// lexically by mount point name. Automagically adds a trailing slash
// to paths.
type byOvernameAndMountPoint []osutil.MountEntry
func (c byOvernameAndMountPoint) Len() int { return len(c) }
func (c byOvernameAndMountPoint) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c byOvernameAndMountPoint) Less(i, j int) bool {
iMe := c[i]
jMe := c[j]
iOrigin := iMe.XSnapdOrigin()
jOrigin := jMe.XSnapdOrigin()
if iOrigin != jOrigin {
// overname entries should always be sorted first, before
// entries from layouts or content interface
if iOrigin == "overname" {
// overname ith element should be sorted before
return true
}
if jOrigin == "overname" {
// non-overname ith element should be sorted after
return false
}
}
iDir := c[i].Dir
jDir := c[j].Dir
if !strings.HasSuffix(iDir, "/") {
iDir = iDir + "/"
}
if !strings.HasSuffix(jDir, "/") {
jDir = jDir + "/"
}
return iDir < jDir
}
// byOriginAndMountPoint allows sorting an array of entries by the
// source of mount entry (overname, other, layout) and lexically by
// mount point name. Automagically adds a trailing slash to paths.
type byOriginAndMountPoint []osutil.MountEntry
func (c byOriginAndMountPoint) Len() int { return len(c) }
func (c byOriginAndMountPoint) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c byOriginAndMountPoint) Less(i, j int) bool {
iMe := c[i]
jMe := c[j]
iOrigin := iMe.XSnapdOrigin()
jOrigin := jMe.XSnapdOrigin()
if iOrigin != jOrigin {
// overname entries should always be sorted first, before
// entries from layouts or content interface
if iOrigin == "overname" {
// overname ith element should be sorted before
return true
}
if jOrigin == "overname" {
// non-overname ith element should be sorted after
return false
}
// neither is overname, can be layout or nothing (implied
// content)
if iOrigin == "layout" {
return false
}
// i is not layout, so it must be nothing (implied content)
if jOrigin == "layout" {
return true
}
}
iDir := c[i].Dir
jDir := c[j].Dir
if !strings.HasSuffix(iDir, "/") {
iDir = iDir + "/"
}
if !strings.HasSuffix(jDir, "/") {
jDir = jDir + "/"
}
return iDir < jDir
}
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