feat(cli): --version option for server and client (#203)

alpenhorn/client/cli.py

@@ -6,7 +6,7 @@
 import peewee as pw
 
 from .. import db
-from ..common.util import start_alpenhorn
+from ..common.util import start_alpenhorn, version_option
 from ..db import (
     ArchiveAcq,
     ArchiveFile,
@@ -46,6 +46,7 @@ def _verbosity_from_cli(verbose: int, debug: int, quiet: int) -> int:
 
 
 @click.group(context_settings={"help_option_names": ["-h", "--help"]})
+@version_option
 @click.option(
     "--conf",
     "-c",

alpenhorn/common/util.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import click
 import socket
 import hashlib
 import logging
@@ -11,6 +12,52 @@
 log = logging.getLogger(__name__)
 
 
+def version_option(func):
+    """Click --version option"""
+    return click.option(
+        "--version",
+        is_flag=True,
+        callback=print_version,
+        expose_value=False,
+        is_eager=True,
+        help="Show version information and exit.",
+    )(func)
+
+
+def print_version(ctx, param, value):
+    """Click callback for the --version eager option."""
+
+    from .. import __version__
+    import sys
+
+    if not value or ctx.resilient_parsing:
+        return
+
+    click.echo(f"alpenhorn {__version__} (Python {sys.version})")
+    click.echo(
+        """
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+"""
+    )
+    ctx.exit(0)
+
+
 def start_alpenhorn(
     cli_conf: str | None, client: bool, verbosity: int | None = None
 ) -> None:

alpenhorn/server/service.py

@@ -6,7 +6,7 @@
 
 from .. import db
 from ..common import config
-from ..common.util import start_alpenhorn
+from ..common.util import start_alpenhorn, version_option
 from ..scheduler import FairMultiFIFOQueue, pool
 from . import auto_import, update
 
@@ -32,6 +32,7 @@ def log_exception(*args):
     default=None,
     metavar="FILE",
 )
+@version_option
 def cli(conf):
     """Alpenhorn data management service."""