3 files changed, 42 insertions, 3 deletions
diff --git a/python/vyos/utils/convert.py b/python/vyos/utils/convert.py
index 9a8a1ff7d..c02f0071e 100644
--- a/python/vyos/utils/convert.py
+++ b/python/vyos/utils/convert.py
@@ -52,7 +52,8 @@ def seconds_to_human(s, separator=""):
 
     return result
 
-def bytes_to_human(bytes, initial_exponent=0, precision=2):
+def bytes_to_human(bytes, initial_exponent=0, precision=2,
+                   int_below_exponent=0):
     """ Converts a value in bytes to a human-readable size string like 640 KB
 
     The initial_exponent parameter is the exponent of 2,
@@ -68,6 +69,8 @@ def bytes_to_human(bytes, initial_exponent=0, precision=2):
 
     # log2 is a float, while range checking requires an int
     exponent = int(log2(bytes))
+    if exponent < int_below_exponent:
+        precision = 0
 
     if exponent < 10:
         value = bytes
diff --git a/python/vyos/utils/file.py b/python/vyos/utils/file.py
index 667a2464b..9f27a7fb9 100644
--- a/python/vyos/utils/file.py
+++ b/python/vyos/utils/file.py
@@ -134,6 +134,12 @@ def chmod_755(path):
               S_IROTH | S_IXOTH
     chmod(path, bitmask)
 
+def chmod_2775(path):
+    """ user/group permissions with set-group-id bit set """
+    from stat import S_ISGID, S_IRWXU, S_IRWXG, S_IROTH, S_IXOTH
+
+    bitmask = S_ISGID | S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH
+    chmod(path, bitmask)
 
 def makedir(path, user=None, group=None):
     if os.path.exists(path):
diff --git a/python/vyos/utils/io.py b/python/vyos/utils/io.py
index 8790cbaac..0afaf695c 100644
--- a/python/vyos/utils/io.py
+++ b/python/vyos/utils/io.py
@@ -13,6 +13,8 @@
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
+from typing import Callable
+
 def print_error(str='', end='\n'):
     """
     Print `str` to stderr, terminated with `end`.
@@ -24,13 +26,18 @@ def print_error(str='', end='\n'):
     sys.stderr.write(end)
     sys.stderr.flush()
 
-def ask_input(question, default='', numeric_only=False, valid_responses=[]):
+def ask_input(question, default='', numeric_only=False, valid_responses=[],
+              no_echo=False):
+    from getpass import getpass
     question_out = question
     if default:
         question_out += f' (Default: {default})'
     response = ''
     while True:
-        response = input(question_out + ' ').strip()
+        if not no_echo:
+            response = input(question_out + ' ').strip()
+        else:
+            response = getpass(question_out + ' ').strip()
         if not response and default:
             return default
         if numeric_only:
@@ -72,3 +79,26 @@ def is_dumb_terminal():
     """Check if the current TTY is dumb, so that we can disable advanced terminal features."""
     import os
     return os.getenv('TERM') in ['vt100', 'dumb']
+
+def select_entry(l: list, list_msg: str = '', prompt_msg: str = '',
+                 list_format: Callable = None,) -> str:
+    """Select an entry from a list
+
+    Args:
+        l (list): a list of entries
+        list_msg (str): a message to print before listing the entries
+        prompt_msg (str): a message to print as prompt for selection
+
+    Returns:
+        str: a selected entry
+    """
+    en = list(enumerate(l, 1))
+    print(list_msg)
+    for i, e in en:
+        if list_format:
+            print(f'\t{i}: {list_format(e)}')
+        else:
+            print(f'\t{i}: {e}')
+    select = ask_input(prompt_msg, numeric_only=True,
+                       valid_responses=range(1, len(l)+1))
+    return next(filter(lambda x: x[0] == select, en))[1]