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broken.go
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broken.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2016 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 snap
import (
"fmt"
"path/filepath"
"strings"
"github.com/snapcore/snapd/dirs"
)
// GuessAppsForBroken guesses what apps and services a broken snap has
// on the system by searching for matches based on the snap name in
// the snap binaries and service file directories. It returns a
// mapping from app names to partial AppInfo.
func GuessAppsForBroken(info *Info) map[string]*AppInfo {
out := make(map[string]*AppInfo)
// guess binaries first
name := info.InstanceName()
for _, p := range []string{name, fmt.Sprintf("%s.*", name)} {
matches, _ := filepath.Glob(filepath.Join(dirs.SnapBinariesDir, p))
for _, m := range matches {
l := strings.SplitN(filepath.Base(m), ".", 2)
var appname string
if len(l) == 1 {
// when app is named the same as snap, it will
// be available under '<snap>' name, if the snap
// was installed with instance key, the app will
// be named `<snap>_<instance>'
appname = InstanceSnap(l[0])
} else {
appname = l[1]
}
out[appname] = &AppInfo{
Snap: info,
Name: appname,
}
}
}
// guess the services next
matches, _ := filepath.Glob(filepath.Join(dirs.SnapServicesDir, fmt.Sprintf("snap.%s.*.service", name)))
for _, m := range matches {
appname := strings.Split(m, ".")[2]
out[appname] = &AppInfo{
Snap: info,
Name: appname,
Daemon: "simple",
DaemonScope: SystemDaemon,
}
}
// guess the user services next
matches, _ = filepath.Glob(filepath.Join(dirs.SnapUserServicesDir, fmt.Sprintf("snap.%s.*.service", name)))
for _, m := range matches {
appname := strings.Split(m, ".")[2]
out[appname] = &AppInfo{
Snap: info,
Name: appname,
Daemon: "simple",
DaemonScope: UserDaemon,
}
}
return out
}
// renameClashingCorePlugs renames plugs that clash with slot names on core snap.
//
// Some released core snaps had explicitly defined plugs "network-bind" and
// "core-support" that clashed with implicit slots with the same names but this
// was not validated before. To avoid a flag day and any potential issues,
// transparently rename the two clashing plugs by appending the "-plug" suffix.
func (info *Info) renameClashingCorePlugs() {
if info.InstanceName() == "core" && info.Type() == TypeOS {
for _, plugName := range []string{"network-bind", "core-support"} {
info.forceRenamePlug(plugName, plugName+"-plug")
}
}
}
// forceRenamePlug renames the plug from oldName to newName, if present.
func (info *Info) forceRenamePlug(oldName, newName string) {
if plugInfo, ok := info.Plugs[oldName]; ok {
delete(info.Plugs, oldName)
info.Plugs[newName] = plugInfo
plugInfo.Name = newName
for _, appInfo := range info.Apps {
if _, ok := appInfo.Plugs[oldName]; ok {
delete(appInfo.Plugs, oldName)
appInfo.Plugs[newName] = plugInfo
}
}
for _, hookInfo := range info.Hooks {
if _, ok := hookInfo.Plugs[oldName]; ok {
delete(hookInfo.Plugs, oldName)
hookInfo.Plugs[newName] = plugInfo
}
}
}
}