forked from sgotti/fsdiffer
/
beforeafter.go
63 lines (57 loc) · 1.89 KB
/
beforeafter.go
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package fsdiffer
import (
"fmt"
"path/filepath"
)
// The BeforeAfterFSDiffer is used to generate changes in a given directory
// between two different points in time.
type BeforeAfterFSDiffer struct {
dir string
before map[string]fileInfo
}
// NewBeforeAfterFSDiffer creates a new BeforeAfterFSDiffer that will report
// changes on the given directory.
func NewBeforeAfterFSDiffer(dir string) *BeforeAfterFSDiffer {
return &BeforeAfterFSDiffer{dir: dir}
}
// Start will walk the provided directory, and record its state for use as the
// before part of the changes returned by Diff.
func (ba *BeforeAfterFSDiffer) Start() error {
if ba.before != nil {
return fmt.Errorf("start already called")
}
ba.before = make(map[string]fileInfo)
return filepath.Walk(ba.dir, fsWalker(ba.before))
}
// 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 (ba *BeforeAfterFSDiffer) Diff() (FSChanges, error) {
changes := FSChanges{}
after := make(map[string]fileInfo)
err := filepath.Walk(ba.dir, fsWalker(after))
if err != nil {
return nil, err
}
for _, afterInfo := range after {
relpath, _ := filepath.Rel(ba.dir, afterInfo.Path)
sourceInfo, ok := ba.before[filepath.Join(ba.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 _, infoA := range ba.before {
relpath, _ := filepath.Rel(ba.dir, infoA.Path)
_, ok := after[filepath.Join(ba.dir, relpath)]
if !ok {
changes = append(changes, &FSChange{Path: relpath, ChangeType: Deleted})
}
}
return changes, nil
}