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temporal.go
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temporal.go
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// Copyright 2015 The appc Authors
//
// 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 fsdiffer
import (
"path/filepath"
)
// TemporalFSDiffer is used to generate changes in a given directory
// between two different points in time.
type TemporalFSDiffer struct {
dir string
before map[string]fileInfo
}
// NewTemporalFSDiffer creates a new TemporalFSDiffer that will report
// changes on the given directory.
func NewTemporalFSDiffer(dir string) (*TemporalFSDiffer, error) {
t := &TemporalFSDiffer{
dir: dir,
before: make(map[string]fileInfo),
}
err := filepath.Walk(t.dir, fsWalker(t.before))
if err != nil {
return nil, err
}
return t, nil
}
// Diff will return any changes to the filesystem in the provided directory
// since Start was called.
//
// To detect if a file was changed it checks the file's size and mtime (like
// rsync does by default if no --checksum options is used)
func (t *TemporalFSDiffer) Diff() (FSChanges, error) {
changes := FSChanges{}
after := make(map[string]fileInfo)
err := filepath.Walk(t.dir, fsWalker(after))
if err != nil {
return nil, err
}
for _, afterInfo := range after {
relpath, _ := filepath.Rel(t.dir, afterInfo.Path)
sourceInfo, ok := t.before[filepath.Join(t.dir, relpath)]
if !ok {
changes = append(changes, &FSChange{Path: relpath, ChangeType: Added})
} else {
if sourceInfo.Size() != afterInfo.Size() || sourceInfo.ModTime().Before(afterInfo.ModTime()) {
changes = append(changes, &FSChange{Path: relpath, ChangeType: Modified})
}
}
}
for _, beforeInfo := range t.before {
relpath, _ := filepath.Rel(t.dir, beforeInfo.Path)
_, ok := after[filepath.Join(t.dir, relpath)]
if !ok {
changes = append(changes, &FSChange{Path: relpath, ChangeType: Deleted})
}
}
return changes, nil
}