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prune_resources.go
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/
prune_resources.go
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// Copyright 2017-present The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hugolib
import (
"fmt"
"io"
"os"
"strings"
"github.com/spf13/afero"
)
// GC requires a build first.
func (h *HugoSites) GC() (int, error) {
s := h.Sites[0]
imageCacheDir := s.resourceSpec.AbsGenImagePath
if len(imageCacheDir) < 10 {
panic("invalid image cache")
}
isInUse := func(filename string) bool {
key := strings.TrimPrefix(filename, imageCacheDir)
for _, site := range h.Sites {
if site.resourceSpec.IsInCache(key) {
return true
}
}
return false
}
counter := 0
err := afero.Walk(s.Fs.Source, imageCacheDir, func(path string, info os.FileInfo, err error) error {
if info == nil {
return nil
}
if !strings.HasPrefix(path, imageCacheDir) {
return fmt.Errorf("Invalid state, walk outside of resource dir: %q", path)
}
if info.IsDir() {
f, err := s.Fs.Source.Open(path)
if err != nil {
return nil
}
defer f.Close()
_, err = f.Readdirnames(1)
if err == io.EOF {
// Empty dir.
s.Fs.Source.Remove(path)
}
return nil
}
inUse := isInUse(path)
if !inUse {
err := s.Fs.Source.Remove(path)
if err != nil && !os.IsNotExist(err) {
s.Log.ERROR.Printf("Failed to remove %q: %s", path, err)
} else {
counter++
}
}
return nil
})
return counter, err
}