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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2017 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 snap
import (
"fmt"
"os"
"github.com/snapcore/snapd/osutil"
)
// addImplicitHooks adds hooks from the installed snap's hookdir to the snap info.
//
// Existing hooks (i.e. ones defined in the YAML) are not changed; only missing
// hooks are added.
func addImplicitHooks(snapInfo *Info, hooksDir string) error {
// First of all, check to ensure the hooks directory exists. If it doesn't,
// it's not an error-- there's just nothing to do.
if !osutil.IsDirectory(hooksDir) {
return nil
}
fileInfos, err := os.ReadDir(hooksDir)
if err != nil {
return fmt.Errorf("unable to read hooks directory: %s", err)
}
for _, fileInfo := range fileInfos {
addHookIfValid(snapInfo, fileInfo.Name())
}
return nil
}
// AddImplicitHooksFromContainer adds hooks from the snap file's hookdir to the snap info.
//
// Existing hooks (i.e. ones defined in the YAML) are not changed; only missing
// hooks are added.
func AddImplicitHooksFromContainer(snapInfo *Info, snapf Container) {
// Read the hooks directory. If this fails we assume the hooks directory
// doesn't exist, which means there are no implicit hooks to load (not an
// error).
fileNames, err := snapf.ListDir("meta/hooks")
if err != nil {
return
}
for _, fileName := range fileNames {
addHookIfValid(snapInfo, fileName)
}
}
func addHookIfValid(snapInfo *Info, hookName string) {
// Verify that the hook name is actually supported. If not, ignore it.
if !IsHookSupported(hookName) {
return
}
// Don't overwrite a hook that has already been loaded from the YAML
if _, ok := snapInfo.Hooks[hookName]; !ok {
snapInfo.Hooks[hookName] = &HookInfo{Snap: snapInfo, Name: hookName}
}
}
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