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// Copyright 2017 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 commands
import (
"os"
"path/filepath"
"github.com/gohugoio/hugo/hugolib/filesystems"
"github.com/fsnotify/fsnotify"
"github.com/gohugoio/hugo/helpers"
"github.com/spf13/fsync"
)
type staticSyncer struct {
c *commandeer
}
func newStaticSyncer(c *commandeer) (*staticSyncer, error) {
return &staticSyncer{c: c}, nil
}
func (s *staticSyncer) isStatic(filename string) bool {
return s.c.hugo().BaseFs.SourceFilesystems.IsStatic(filename)
}
func (s *staticSyncer) syncsStaticEvents(staticEvents []fsnotify.Event) error {
c := s.c
syncFn := func(sourceFs *filesystems.SourceFilesystem) (uint64, error) {
publishDir := helpers.FilePathSeparator
if sourceFs.PublishFolder != "" {
publishDir = filepath.Join(publishDir, sourceFs.PublishFolder)
}
syncer := fsync.NewSyncer()
syncer.NoTimes = c.Cfg.GetBool("noTimes")
syncer.NoChmod = c.Cfg.GetBool("noChmod")
syncer.ChmodFilter = chmodFilter
syncer.SrcFs = sourceFs.Fs
syncer.DestFs = c.Fs.PublishDir
if c.renderStaticToDisk {
syncer.DestFs = c.Fs.PublishDirStatic
}
// prevent spamming the log on changes
logger := helpers.NewDistinctErrorLogger()
for _, ev := range staticEvents {
// Due to our approach of layering both directories and the content's rendered output
// into one we can't accurately remove a file not in one of the source directories.
// If a file is in the local static dir and also in the theme static dir and we remove
// it from one of those locations we expect it to still exist in the destination
//
// If Hugo generates a file (from the content dir) over a static file
// the content generated file should take precedence.
//
// Because we are now watching and handling individual events it is possible that a static
// event that occupies the same path as a content generated file will take precedence
// until a regeneration of the content takes places.
//
// Hugo assumes that these cases are very rare and will permit this bad behavior
// The alternative is to track every single file and which pipeline rendered it
// and then to handle conflict resolution on every event.
fromPath := ev.Name
relPath, found := sourceFs.MakePathRelative(fromPath)
if !found {
// Not member of this virtual host.
continue
}
// Remove || rename is harder and will require an assumption.
// Hugo takes the following approach:
// If the static file exists in any of the static source directories after this event
// Hugo will re-sync it.
// If it does not exist in all of the static directories Hugo will remove it.
//
// This assumes that Hugo has not generated content on top of a static file and then removed
// the source of that static file. In this case Hugo will incorrectly remove that file
// from the published directory.
if ev.Op&fsnotify.Rename == fsnotify.Rename || ev.Op&fsnotify.Remove == fsnotify.Remove {
if _, err := sourceFs.Fs.Stat(relPath); os.IsNotExist(err) {
// If file doesn't exist in any static dir, remove it
logger.Println("File no longer exists in static dir, removing", relPath)
_ = c.Fs.PublishDirStatic.RemoveAll(relPath)
} else if err == nil {
// If file still exists, sync it
logger.Println("Syncing", relPath, "to", publishDir)
if err := syncer.Sync(relPath, relPath); err != nil {
c.logger.Errorln(err)
}
} else {
c.logger.Errorln(err)
}
continue
}
// For all other event operations Hugo will sync static.
logger.Println("Syncing", relPath, "to", publishDir)
if err := syncer.Sync(filepath.Join(publishDir, relPath), relPath); err != nil {
c.logger.Errorln(err)
}
}
return 0, nil
}
_, err := c.doWithPublishDirs(syncFn)
return err
}
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