def restore_backup(flags, bak_dir, num=None, name=None):
"""
Tries to restore repository to a saved backup.
Will prompt the user for the requested restore point if
num is not set.
- bak_dir -- The backup storage directory.
- num -- The index number of the restore point (latest first).
"""
try:
check_git_rep()
# If name is set just restore that file.
if name is not None:
bak_name = name
else:
# Find all previously backed up states.
bak_files = get_files_with_extension(bak_dir, _BAK_FILE_EXT)
if not bak_files:
raise OpError("No backups exists in directory \'" +
bak_dir + "\'")
# Sort the bak_files according to date.
bak_files.sort(key=lambda bak_f: [int(v) for v in
bak_f.split('_')[1].split('.')[
0].split('-')],
reverse=True)
# Set the max tab depth.
max_tab_depth = max([1 + (len(s.split('_')[0]) // _TAB_WIDTH)
for s in bak_files])
# Prompt user to select a state to restore.
options = []
for f_name in bak_files:
option = "\t" + f_name.split('_')[0]
option += "\t" * (max_tab_depth -
len(f_name.split('_')[0]) // _TAB_WIDTH)
option += datetime.strptime(
f_name.split('_')[1].split('.')[0],
_BAK_FILE_DATE_FORMAT).strftime(_BAK_DISPLAY_DATE_FORMAT)
options.append(option)
# Check if prompt can be skipped.
if num is not None:
if num >= len(options) or num < 0:
raise OpError("Invalid backup index \'" +
num + "\' is outside [0-" +
str(len(options) - 1) + "]")
else:
# Prompt.
num = prompt_user_options("Select the backup to restore",
options)
if num is None:
raise OpError(msg="Restore aborted by user")
# Set the chosen backup name.
bak_name = bak_files[num]
# Restore backup.
try:
log(flags, "Restoring backup \'" + bak_name + "\'")
clean_dir(flags, getcwd())
if not flags[Flag.SAFEMODE]:
exec_cmd(["tar", "-xf", path.join(bak_dir, bak_name)])
except Error as err:
log(flags, "Restore failed, the backup can be found in \'" +
bak_dir + "\'", TextType.ERR)
raise OpError(err)
except GitError as err:
log(flags, "Restore could not be completed")
raise OpError(err)