// TakeSnapshot recursivelly snapshots the current directory.
func TakeSnapshot(b *bolt.Bucket, filePath string) types.Hash {
// Determine if path is a directory or a file
info, err := os.Stat(filePath)
if err != nil {
log.Fatalln("Could not call os.Stat on " + filePath)
}
if info.IsDir() {
// If the path is a directory, we need to create a tree object
treeObject := types.NewTreeObject()
// Enumerate all of the files in this directory
files, err := ioutil.ReadDir(filePath)
if err != nil {
log.Fatalf("Could not list files in dir %s: %v", filePath, err)
}
for _, file := range files {
if util.IgnorePath(file.Name()) {
continue
}
// Snapshot the file, and add it to the current tree object
hash := TakeSnapshot(b, path.Join(filePath, file.Name()))
treeObject.AddFile(file.Name(), hash, file.IsDir())
}
// Calculate hash of the directory
serialized := treeObject.Serialize()
hash := types.CalculateHash(serialized)
// Put directory into database, addressed by it's hash
b.Put(hash, serialized)
util.DebugLog("Put directory \"" + filePath + "\" into database with hash " + hash.String())
return hash
}
// Calculate hash of file contents
file, err := ioutil.ReadFile(filePath)
if err != nil {
panic(err.Error())
}
hash := types.CalculateHash(file)
// Put file into database, addressed by it's hash
b.Put(hash, file)
util.DebugLog("Put file \"" + filePath + "\" into database with hash " + hash.String())
return hash
}
// TreeDiff lists the differences between a Tree object in a snapshot
// and a filesystem path.
func TreeDiff(objects *bolt.Bucket, treeHash types.Hash, dir string) []Difference {
differences := []Difference{}
// Try to list all of the files in this directory.
files, listErr := ioutil.ReadDir(dir)
// Try to load in the tree object.
var treeObject *types.TreeObject = nil
if !treeHash.Equal(types.EMPTY) {
treeObject = types.DeserializeTreeObject(objects.Get(treeHash))
}
// For each file in the current directory, determine if the file was either added or modified.
if listErr == nil {
for _, file := range files {
if util.IgnorePath(file.Name()) {
continue
}
if file.IsDir() {
if treeObject == nil {
differences = append(differences, TreeDiff(objects, types.EMPTY, path.Join(dir, file.Name()))...)
} else {
if treeObject.HasFile(file.Name()) {
differences = append(differences, TreeDiff(objects, treeObject.GetFile(file.Name()), path.Join(dir, file.Name()))...)
} else {
differences = append(differences, TreeDiff(objects, types.EMPTY, path.Join(dir, file.Name()))...)
}
}
} else {
if treeObject == nil {
differences = append(differences, Difference{
Type: "A",
FilePath: path.Join(dir, file.Name()),
})
} else {
if treeObject.HasFile(file.Name()) {
fileBytes, err := ioutil.ReadFile(path.Join(dir, file.Name()))
if err != nil {
panic(err)
}
if !types.CalculateHash(fileBytes).Equal(treeObject.GetFile(file.Name())) {
differences = append(differences, Difference{
Type: "M",
FilePath: path.Join(dir, file.Name()),
})
}
} else {
differences = append(differences, Difference{
Type: "A",
FilePath: path.Join(dir, file.Name()),
})
}
}
}
}
}
// For each file in the the tree object, see if that file was removed in the working directory
if treeObject != nil {
for _, entry := range treeObject.Files {
if !listHasFile(files, entry.Name) {
if entry.IsDir {
differences = append(differences, TreeDiff(objects, entry.Hash, path.Join(dir, entry.Name))...)
} else {
differences = append(differences, Difference{
Type: "R",
FilePath: path.Join(dir, entry.Name),
})
}
}
}
}
return differences
}
// Commit implements `got commit`
func Commit(c *cli.Context) {
db := util.OpenDB()
defer db.Close()
if len(c.String("message")) == 0 {
log.Fatalln("Must supply a commit message.")
}
if len(c.String("author")) == 0 {
log.Fatalln("Must supply a commit author.")
}
// Perform operations in a write lock
err := db.Update(func(tx *bolt.Tx) error {
info := tx.Bucket(util.INFO) // The bucket holding repositry metadata
objects := tx.Bucket(util.OBJECTS) // The bucket holding got objects
current := info.Get(util.CURRENT)
// Create a commit object from the current directory snapshot
util.DebugLog("Taking snapshot of repo...")
hash := TakeSnapshot(tx.Bucket(util.OBJECTS), ".")
util.DebugLog("Repo snapshot has hash " + hash.String() + ".")
commit := types.CommitObject{
Author: c.String("author"),
Message: c.String("message"),
Time: time.Now(),
Tree: hash,
Parents: make([]types.Hash, 0),
}
// There is a 'current' commit, then it is the parent of the new commit
if current != nil {
commit.Parents = append(commit.Parents, current)
}
commitBytes := commit.Serialize()
commitSha := types.CalculateHash(commitBytes)
objects.Put(commitSha, commitBytes)
util.DebugLog("Created commit of sha " + commitSha.String() + ".")
// CURRENT now corresponds to the commit that we just created
info.Put(util.CURRENT, commitSha)
// Update heads
headsBytes := info.Get(util.HEADS)
if headsBytes != nil {
heads := types.DeserializeHashes(headsBytes)
util.DebugLog("Currently " + strconv.Itoa(len(heads)) + " heads in this repo...")
// Remove current, if it is a head
for i, head := range heads {
if head.Equal(current) {
heads = append(heads[:i], heads[i+1:]...)
break
}
}
// Add the new commit as a head
heads = append(heads, commitSha)
info.Put(util.HEADS, types.SerializeHashes(heads))
} else {
util.DebugLog("Currently no heads in this repo. Putting HEADS: " + fmt.Sprint(([]types.Hash{commitSha})))
info.Put(util.HEADS, types.SerializeHashes([]types.Hash{commitSha}))
}
return nil
})
if err != nil {
log.Fatal("Error reading from the database.")
}
}
