sync: add dependency on flag to download file

libfic/file.go

@@ -84,6 +84,15 @@ func GetFileByPath(path string) (EFile, error) {
 	return f, nil
 }
 
+// GetFileByFilename retrieves the file that should be called so.
+func (e Exercice) GetFileByFilename(filename string) (f EFile, err error) {
+	filename = path.Base(filename)
+
+	err = DBQueryRow("SELECT id_file, origin, path, id_exercice, name, cksum, size FROM exercice_files WHERE id_exercice = ? AND origin LIKE ?", e.Id, "%/" + filename).Scan(&f.Id, &f.origin, &f.Path, &f.IdExercice, &f.Name, &f.Checksum, &f.Size)
+
+	return
+}
+
 // GetFiles returns a list of files coming with the challenge.
 func (e Exercice) GetFiles() ([]EFile, error) {
 	if rows, err := DBQuery("SELECT id_file, origin, path, name, cksum, size FROM exercice_files WHERE id_exercice = ?", e.Id); err != nil {
@@ -262,6 +271,35 @@ func (f EFile) GetOrigin() string {
 	return f.origin
 }
 
+// AddDepend insert a new dependency to a given flag.
+func (f EFile) AddDepend(k Key) (err error) {
+	_, err = DBExec("INSERT INTO exercice_files_deps (id_file, id_key) VALUES (?, ?)", f.Id, k.Id)
+	return
+}
+
+// GetDepends retrieve the flag's dependency list.
+func (f EFile) GetDepends() ([]Key, error) {
+	if rows, err := DBQuery("SELECT id_key FROM exercice_files_deps WHERE id_file = ?", f.Id); err != nil {
+		return nil, err
+	} else {
+		defer rows.Close()
+
+		var deps = make([]Key, 0)
+		for rows.Next() {
+			var d int64
+			if err := rows.Scan(&d); err != nil {
+				return nil, err
+			}
+			deps = append(deps, Key{d, f.IdExercice, "", []byte{}})
+		}
+		if err := rows.Err(); err != nil {
+			return nil, err
+		}
+
+		return deps, nil
+	}
+}
+
 // CheckFileOnDisk recalculates the hash of the file on disk.
 func (f EFile) CheckFileOnDisk() error {
 	if _, size, err := checkFileHash(path.Join(FilesDir, f.Path), f.Checksum); err != nil {