func (info *FileInfo) addChanges(oldInfo *FileInfo, changes *[]Change) { sizeAtEntry := len(*changes) if oldInfo == nil { // add change := Change{ Path: info.path(), Kind: ChangeAdd, } *changes = append(*changes, change) info.added = true } // We make a copy so we can modify it to detect additions // also, we only recurse on the old dir if the new info is a directory // otherwise any previous delete/change is considered recursive oldChildren := make(map[string]*FileInfo) if oldInfo != nil && info.isDir() { for k, v := range oldInfo.children { oldChildren[k] = v } } for name, newChild := range info.children { oldChild, _ := oldChildren[name] if oldChild != nil { // change? oldStat := &oldChild.stat newStat := &newChild.stat // Note: We can't compare inode or ctime or blocksize here, because these change // when copying a file into a container. However, that is not generally a problem // because any content change will change mtime, and any status change should // be visible when actually comparing the stat fields. The only time this // breaks down is if some code intentionally hides a change by setting // back mtime if oldStat.Mode != newStat.Mode || oldStat.Uid != newStat.Uid || oldStat.Gid != newStat.Gid || oldStat.Rdev != newStat.Rdev || // Don't look at size for dirs, its not a good measure of change (oldStat.Size != newStat.Size && oldStat.Mode&syscall.S_IFDIR != syscall.S_IFDIR) || !sameFsTimeSpec(system.GetLastModification(oldStat), system.GetLastModification(newStat)) || bytes.Compare(oldChild.capability, newChild.capability) != 0 { change := Change{ Path: newChild.path(), Kind: ChangeModify, } *changes = append(*changes, change) newChild.added = true } // Remove from copy so we can detect deletions delete(oldChildren, name) } newChild.addChanges(oldChild, changes) } for _, oldChild := range oldChildren { // delete change := Change{ Path: oldChild.path(), Kind: ChangeDelete, } *changes = append(*changes, change) } // If there were changes inside this directory, we need to add it, even if the directory // itself wasn't changed. This is needed to properly save and restore filesystem permissions. if len(*changes) > sizeAtEntry && info.isDir() && !info.added && info.path() != "/" { change := Change{ Path: info.path(), Kind: ChangeModify, } // Let's insert the directory entry before the recently added entries located inside this dir *changes = append(*changes, change) // just to resize the slice, will be overwritten copy((*changes)[sizeAtEntry+1:], (*changes)[sizeAtEntry:]) (*changes)[sizeAtEntry] = change } }
func (info *FileInfo) addChanges(oldInfo *FileInfo, changes *[]Change) { if oldInfo == nil { // add change := Change{ Path: info.path(), Kind: ChangeAdd, } *changes = append(*changes, change) } // We make a copy so we can modify it to detect additions // also, we only recurse on the old dir if the new info is a directory // otherwise any previous delete/change is considered recursive oldChildren := make(map[string]*FileInfo) if oldInfo != nil && info.isDir() { for k, v := range oldInfo.children { oldChildren[k] = v } } for name, newChild := range info.children { oldChild, _ := oldChildren[name] if oldChild != nil { // change? oldStat := &oldChild.stat newStat := &newChild.stat // Note: We can't compare inode or ctime or blocksize here, because these change // when copying a file into a container. However, that is not generally a problem // because any content change will change mtime, and any status change should // be visible when actually comparing the stat fields. The only time this // breaks down is if some code intentionally hides a change by setting // back mtime if oldStat.Mode != newStat.Mode || oldStat.Uid != newStat.Uid || oldStat.Gid != newStat.Gid || oldStat.Rdev != newStat.Rdev || // Don't look at size for dirs, its not a good measure of change (oldStat.Size != newStat.Size && oldStat.Mode&syscall.S_IFDIR != syscall.S_IFDIR) || !sameFsTimeSpec(system.GetLastModification(oldStat), system.GetLastModification(newStat)) || bytes.Compare(oldChild.capability, newChild.capability) != 0 { change := Change{ Path: newChild.path(), Kind: ChangeModify, } *changes = append(*changes, change) } // Remove from copy so we can detect deletions delete(oldChildren, name) } newChild.addChanges(oldChild, changes) } for _, oldChild := range oldChildren { // delete change := Change{ Path: oldChild.path(), Kind: ChangeDelete, } *changes = append(*changes, change) } }