require python-3.6 or later, update CI

.github/workflows/linux.yml

@@ -1,46 +1,39 @@
 name: Linux tests
 
-on:
+"on":
   push:         {branches: [master]}
   pull_request: {branches: [master]}
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 30
     strategy:
       fail-fast: false
       matrix:
         imgtag:
-          - 2.7-buster
-          - 3.4-stretch
-          - 3.5-buster
-          - 3.6-buster
-          - 3.7-buster
-          - 3.8-bullseye
-          - 3.9-bullseye
-          - 3.10-bullseye
+          - 3.6-bullseye
+          - 3.7-bullseye
+          - 3.8-bookworm
+          - 3.9-bookworm
+          - 3.10-bookworm
+          - 3.11-bookworm
+          - 3.12-bookworm
+          - 3.13-bookworm
         paramiko_ver:
-          - 2.6.4
-          - 2.7.10
-          - 2.8.8
+          - 2.6.6
+          - 2.7.12
+          - 2.8.10
     container: "python:${{matrix.imgtag}}"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: System dependencies
         run: |
           apt-get -q -y update
           apt-get -q -y install openssh-client openssh-server rsync sudo
-          if [ 3.4-stretch = "${{matrix.imgtag}}" ]; then
-            sed -i -e '/^mesg n/d' /root/.profile
-          fi
       - name: Python dependencies
         run: |
-          # nose and Fudge need use_2to3 which setuptools-58 removed
-          pip install 'setuptools<58'
-          # nose binary wheel is not compatible with python-3.10
-          # see https://github.com/nose-devs/nose/issues/1099#issuecomment-577412313
-          pip install --no-binary nose -r dev-requirements.txt
+          pip install -r dev-requirements.txt
           pip install paramiko-ng==${{matrix.paramiko_ver}}
           pip install -e .
       - name: Lint
@@ -50,10 +43,10 @@ jobs:
       - name: Setup SSH
         run: |
           export USER=root HOME=/root
-          mkdir -v /run/sshd
+          mkdir -v -p /run/sshd
           /usr/sbin/sshd -D & sleep 1
-          mkdir -v ~/.ssh
-          ssh-keygen -N "" -f ~/.ssh/testkey
+          mkdir -v -p ~/.ssh
+          ssh-keygen -t ecdsa -N "" -f ~/.ssh/testkey
           cp -v ~/.ssh/testkey.pub ~/.ssh/authorized_keys
           ssh-keyscan -t ecdsa localhost > ~/.ssh/known_hosts
       - name: Test
@@ -65,19 +58,19 @@ jobs:
           script -e -q -c "fab -H localhost test:integration" /dev/null
 
   docs:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 30
+    container: "python:3.9-bookworm"
+
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v1
-        with:
-          python-version: 3.8
+      - uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |
           pip install -r doc-requirements.txt
-          pip install paramiko-ng==2.8.4
+          pip install paramiko-ng==2.8.10
           pip install -e .
+
       - name: Build docs
         run: |
           sphinx-build -W sites/docs tmpbuild

README.rst

@@ -1,4 +1,4 @@
-*fab-classic* is a Python (2.7 or 3.4+) library and command-line tool
+*fab-classic* is a Python (3.6+) library and command-line tool
 for streamlining the use of SSH for application deployment or systems
 administration tasks.
 

dev-requirements.txt

@@ -1,15 +1,9 @@
 # You should already have Paramiko and your local Fabric checkout installed
 # Test runner/testing utils
-nose<2.0
-# Rudolf adds color to the output of 'fab test'. This is a custom fork
-# addressing Python 2.7 and Nose's 'skip' plugin compatibility issues.
-https://github.com/iknite/rudolf/archive/4a33a26a3aff.tar.gz#egg=rudolf==0.4
-# Mocking library
-Fudge<1.0
+nose-py3
+# Fudge mocking library, small fork with use_2to3 removed from setup
+https://github.com/ploxiln/fudge/archive/a252954d6e34.tar.gz#egg=fudge
 # used in some tests
-jinja2<4.0
+jinja2 <4.0
 # flake8
-flake8==3.7.9
-mccabe==0.6.1
-pycodestyle==2.5.0
-pyflakes==2.1.1
+flake8 <6

fabfile.py

@@ -17,6 +17,6 @@ def test(args=None):
     # Default to explicitly targeting the 'tests' folder, but only if nothing
     # is being overridden.
     tests = "" if args else " tests"
-    default_args = "-sv --with-doctest --nologcapture --with-color %s" % tests
+    default_args = "-sv --with-doctest --nologcapture %s" % tests
     default_args += (" " + args) if args else ""
     nose.core.run_exit(argv=[''] + default_args.split())

fabric/context_managers.py

@@ -18,8 +18,7 @@
 
 """
 
-from contextlib import contextmanager
-import six
+from contextlib import contextmanager, ExitStack
 import socket
 import select
 
@@ -28,16 +27,12 @@
 from fabric import state
 from fabric.utils import isatty
 
-if six.PY2 is True:
-    from contextlib import nested
-else:
-    from contextlib import ExitStack
 
-    class nested(ExitStack):
-        def __init__(self, *managers):
-            super(nested, self).__init__()
-            for manager in managers:
-                self.enter_context(manager)
+class nested(ExitStack):
+    def __init__(self, *managers):
+        super(nested, self).__init__()
+        for manager in managers:
+            self.enter_context(manager)
 
 
 if not win32:
@@ -130,7 +125,7 @@ def _setenv(variables):
     clean_revert = variables.pop('clean_revert', False)
     previous = {}
     new = []
-    for key, value in six.iteritems(variables):
+    for key, value in variables.items():
         if key in state.env:
             previous[key] = state.env[key]
         else:
@@ -140,7 +135,7 @@ def _setenv(variables):
         yield
     finally:
         if clean_revert:
-            for key, value in six.iteritems(variables):
+            for key, value in variables.items():
                 # If the current env value for this key still matches the
                 # value we set it to beforehand, we are OK to revert it to the
                 # pre-block value.

fabric/contrib/files.py

@@ -4,8 +4,7 @@
 
 import hashlib
 import os
-import six
-
+from io import StringIO
 from functools import partial
 
 from fabric.api import run, sudo, hide, settings, env, put, abort
@@ -163,12 +162,12 @@ def upload_template(filename, destination, context=None, use_jinja=False,
         target = destination.replace(' ', r'\ ')
         func("cp %s %s.bak" % (target, target))
 
-    if six.PY3 is True and isinstance(text, bytes):
+    if isinstance(text, bytes):
         text = text.decode('utf-8')
 
     # Upload the file.
     return put(
-        local_path=six.StringIO(text),
+        local_path=StringIO(text),
         remote_path=destination,
         use_sudo=use_sudo,
         mirror_local_mode=mirror_local_mode,
@@ -413,7 +412,7 @@ def append(filename, text, use_sudo=False, partial=False, escape=True,
     """
     func = use_sudo and sudo or run
     # Normalize non-list input to be a list
-    if isinstance(text, six.string_types):
+    if isinstance(text, str):
         text = [text]
     for line in text:
         regex = '^' + _escape_for_regex(line) + ('' if partial else '$')

fabric/contrib/project.py

@@ -5,8 +5,6 @@
 import os.path
 from tempfile import mkdtemp
 
-import six
-
 from fabric.network import needs_host, key_filenames, normalize
 from fabric.operations import local, run, sudo, put
 from fabric.state import env, output
@@ -106,7 +104,7 @@ def rsync_project(
         The ``default_opts`` keyword argument.
     """
     # Turn single-string exclude into a one-item list for consistency
-    if isinstance(exclude, six.string_types):
+    if isinstance(exclude, str):
         exclude = (exclude,)
     # Create --exclude options from exclude list
     exclude_opts = ' --exclude "%s"' * len(exclude)

fabric/decorators.py

@@ -1,7 +1,6 @@
 """
 Convenience decorators for use in fabfiles.
 """
-import six
 import types
 from functools import wraps
 
@@ -55,7 +54,7 @@ def inner_decorator(*args, **kwargs):
             return func(*args, **kwargs)
         _values = values
         # Allow for single iterable argument as well as *args
-        if len(_values) == 1 and not isinstance(_values[0], six.string_types):
+        if len(_values) == 1 and not isinstance(_values[0], str):
             _values = _values[0]
         setattr(inner_decorator, attribute, list(_values))
         # Don't replace @task new-style task objects with inner_decorator by

fabric/io.py

@@ -5,8 +5,6 @@
 from select import select
 from collections import deque
 
-import six
-
 from fabric.state import env, output, win32
 from fabric.auth import get_password, set_password
 import fabric.network
@@ -92,7 +90,7 @@ def loop(self):
                     raise CommandTimeout(timeout=self.timeout)
                 continue
 
-            if six.PY3 is True and isinstance(bytelist, six.binary_type):
+            if isinstance(bytelist, bytes):
                 # Note that we have to decode this right away, even if an error
                 # is thrown only later in the code, because e.g. '' != b'' (see
                 # first if below).
@@ -243,7 +241,7 @@ def _get_prompt_response(self):
         Iterate through the request prompts dict and return the response and
         original request if we find a match
         """
-        for tup in six.iteritems(env.prompts):
+        for tup in env.prompts.items():
             if _endswith(self.capture, tup[0]):
                 return tup
         return None, None

fabric/main.py

@@ -20,8 +20,6 @@
 except ImportError:
     from collections import Mapping
 
-import six
-
 # For checking callables against the API, & easy mocking
 from fabric import api, state, colors
 from fabric.contrib import console, files, project
@@ -379,7 +377,7 @@ def _is_task(name, value):
 
 def _sift_tasks(mapping):
     tasks, collections = [], []
-    for name, value in six.iteritems(mapping):
+    for name, value in mapping.items():
         if _is_task(name, value):
             tasks.append(name)
         elif isinstance(value, Mapping):
@@ -410,7 +408,7 @@ def _print_docstring(docstrings, name):
     if not docstrings:
         return False
     docstring = crawl(name, state.commands).__doc__
-    if isinstance(docstring, six.string_types):
+    if isinstance(docstring, str):
         return docstring
 
 
@@ -644,7 +642,7 @@ def main(fabfile_locations=None):
         # Handle --hosts, --roles, --exclude-hosts (comma separated string =>
         # list)
         for key in ['hosts', 'roles', 'exclude_hosts']:
-            if key in state.env and isinstance(state.env[key], six.string_types):
+            if key in state.env and isinstance(state.env[key], str):
                 state.env[key] = state.env[key].split(',')
 
         # Feed the env.tasks : tasks that are asked to be executed.

fabric/network.py

@@ -7,9 +7,9 @@
 import os
 import re
 import time
-import six
 import socket
 import sys
+from io import StringIO
 
 import paramiko as ssh
 
@@ -204,7 +204,7 @@ def key_filenames():
     from fabric.state import env
     keys = env.key_filename
     # For ease of use, coerce stringish key filename into list
-    if isinstance(env.key_filename, six.string_types) or env.key_filename is None:
+    if isinstance(env.key_filename, str) or env.key_filename is None:
         keys = [keys]
     # Strip out any empty strings (such as the default value...meh)
     keys = list(filter(bool, keys))
@@ -232,7 +232,7 @@ def key_from_env(passphrase=None):
             if output.debug:
                 sys.stderr.write("Trying to load it as %s\n" % pkey_class)
             try:
-                return pkey_class.from_private_key(six.StringIO(env.key), passphrase)
+                return pkey_class.from_private_key(StringIO(env.key), passphrase)
             except Exception as e:
                 # File is valid key, but is encrypted: raise it, this will
                 # cause cxn loop to prompt for passphrase & retry
@@ -612,10 +612,6 @@ def connect(user, host, port, cache, seek_gateway=True):
 
 
 def _password_prompt(prompt, stream):
-    # NOTE: Using encode-to-ascii to prevent (Windows, at least) getpass from
-    # choking if given Unicode.
-    if six.PY3 is False:
-        prompt = prompt.encode('ascii', 'ignore')
     return getpass.getpass(prompt, stream)
 
 def prompt_for_password(prompt=None, no_colon=False, stream=None):
@@ -678,12 +674,7 @@ def host_prompting_wrapper(*args, **kwargs):
             handle_prompt_abort("the target host connection string")
             prompt = "No hosts found. Please specify (single) " \
                 "host string for connection: "
-            # WARNING: do not use six.moves.input, because test cases to not
-            # overwrite that method with a faked method from Fudge
-            if six.PY3 is True:
-                host_string = input(prompt)
-            else:
-                host_string = raw_input(prompt)  # noqa: F821
+            host_string = input(prompt)
             env.update(to_dict(host_string))
         return func(*args, **kwargs)
     host_prompting_wrapper.undecorated = func