Add packse fetch

src/packse/cli.py

@@ -13,6 +13,7 @@
     ServeError,
     UserError,
 )
+from packse.fetch import fetch
 from packse.index import index_down, index_up
 from packse.inspect import inspect
 from packse.list import list
@@ -41,7 +42,7 @@ def entrypoint():
     try:
         args.call(args)
     except DestinationAlreadyExists as exc:
-        print(f"{exc}. Pass `--rm` to allow removal.", file=sys.stderr)
+        print(f"{exc}. Pass `--force` to allow removal.", file=sys.stderr)
         exit(1)
     except UserError as exc:
         print(f"{exc}.", file=sys.stderr)
@@ -73,7 +74,7 @@ def entrypoint():
 def _call_build(args):
     build(
         args.targets,
-        rm_destination=args.rm,
+        rm_destination=args.force,
         short_names=args.short_names,
         no_hash=args.no_hash,
         skip_root=args.skip_root,
@@ -88,7 +89,7 @@ def _call_build_package(args):
         args.no_sdist,
         args.requires_python,
         args.wheel_tag,
-        args.rm,
+        args.force,
     )
 
 
@@ -137,6 +138,14 @@ def _call_publish(args):
     )
 
 
+def _call_fetch(args):
+    fetch(
+        args.dest,
+        ref=args.ref,
+        force=args.force,
+    )
+
+
 def _call_list(args):
     skip_invalid = args.skip_invalid
     if not args.targets:
@@ -195,9 +204,9 @@ def _add_build_parser(subparsers):
         help="The scenario to build",
     )
     parser.add_argument(
-        "--rm",
+        "--force",
         action="store_true",
-        help="Allow removal of existing build directory",
+        help="Overwrite existing builds",
     )
     parser.add_argument(
         "--short-names",
@@ -254,9 +263,9 @@ def _add_build_package_parser(subparsers):
         help="Disable building source distributions",
     )
     parser.add_argument(
-        "--rm",
+        "--force",
         action="store_true",
-        help="Allow removal of existing build directory",
+        help="Replace existing builds",
     )
     _add_shared_arguments(parser)
 
@@ -498,6 +507,31 @@ def _add_shared_arguments(parser):
     )
 
 
+def _add_fetch_parser(subparsers):
+    parser = subparsers.add_parser(
+        "fetch", help="Fetch built-in scenarios from the packse repository"
+    )
+    parser.set_defaults(call=_call_fetch)
+    parser.add_argument(
+        "--dest",
+        type=Path,
+        help="Where to place the fetched scenarios",
+    )
+    parser.add_argument(
+        "--ref",
+        type=str,
+        default=None,
+        help="The reference to fetch",
+    )
+    parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        help="Allow replacement of existing destination directory",
+    )
+    _add_shared_arguments(parser)
+
+
 def get_parser() -> argparse.ArgumentParser:
     parser = _root_parser()
     subparsers = parser.add_subparsers(title="commands")
@@ -508,6 +542,7 @@ def get_parser() -> argparse.ArgumentParser:
     _add_list_parser(subparsers)
     _add_inspect_parser(subparsers)
     _add_serve_parser(subparsers)
+    _add_fetch_parser(subparsers)
     _add_index_parser(subparsers)
 
     return parser

src/packse/fetch.py

@@ -0,0 +1,78 @@
+import logging
+import shutil
+import subprocess
+import tempfile
+import time
+from pathlib import Path
+
+import pkg_resources
+
+from packse.error import DestinationAlreadyExists
+
+logger = logging.getLogger(__name__)
+
+
+def fetch(
+    dest: Path | None = None,
+    ref: str | None = None,
+    repo_url: str = "https://github.com/zanieb/packse",
+    repo_subdir: str = "scenarios",
+    force: bool = False,
+):
+    start_time = time.time()
+    dest = dest or (Path.cwd() / "scenarios")
+
+    if dest.exists() and not force:
+        raise DestinationAlreadyExists(dest)
+
+    if not ref:
+        ref = pkg_resources.get_distribution("packse").version
+        if ref == "0.0.0":
+            ref = "HEAD"
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # Perform a sparse checkout where we only grab the `scenarios` folder
+        logger.info("Cloning repository %s", repo_url)
+        subprocess.check_call(
+            [
+                "git",
+                "clone",
+                "-n",
+                "--depth=1",
+                "--filter=tree:0",
+                repo_url,
+                "repo",
+            ],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.STDOUT,
+            cwd=tmpdir,
+        )
+
+        logger.info("Checking out directory '%s' at ref %s", repo_subdir, ref)
+        subprocess.check_call(
+            ["git", "sparse-checkout", "set", "--no-cone", repo_subdir],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.STDOUT,
+            cwd=Path(tmpdir) / "repo",
+        )
+        subprocess.check_call(
+            ["git", "checkout", ref],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.STDOUT,
+            cwd=Path(tmpdir) / "repo",
+        )
+
+        src = Path(tmpdir) / "repo" / repo_subdir
+        file_count = 0
+        for file in src.iterdir():
+            file_count += 1
+            logger.info("Found file %s", file.name)
+
+        logger.info("Copying files into '%s'", dest)
+        shutil.copytree(src, dest, dirs_exist_ok=True)
+
+    logger.info(
+        "Fetched %s files in %.2fs",
+        file_count,
+        time.time() - start_time,
+    )

tests/__snapshots__/test_build.ambr

@@ -210,20 +210,17 @@
     }),
     'stderr': '''
       Building 'example-8597e52a' in directory '[PWD]/build/example-8597e52a'
-      Destination directory '[PWD]/build/example-8597e52a' already exists. Pass `--rm` to allow removal.
+      Destination directory '[PWD]/build/example-8597e52a' already exists. Pass `--force` to allow removal.
 
     ''',
     'stdout': '',
   })
 # ---
 # name: test_build_example_already_exists_with_rm_flag
   dict({
-    'exit_code': 0,
+    'exit_code': 2,
     'stderr': '<not included>',
-    'stdout': '''
-      example-8597e52a
-
-    ''',
+    'stdout': '',
   })
 # ---
 # name: test_build_example_short_names
@@ -632,8 +629,8 @@
   dict({
     'exit_code': 2,
     'stderr': '''
-      usage: packse build [-h] [--rm] [--short-names] [--no-hash] [--skip-root] [-v]
-                          [-q]
+      usage: packse build [-h] [--force] [--short-names] [--no-hash] [--skip-root]
+                          [-v] [-q]
                           targets [targets ...]
       packse build: error: the following arguments are required: targets
 

tests/__snapshots__/test_build_pkg.ambr

@@ -75,7 +75,7 @@
     'stderr': '''
       usage: packse build-pkg [-h] [-t WHEEL_TAG] [--no-wheel]
                               [--requires-python REQUIRES_PYTHON] [--no-sdist]
-                              [--rm] [-v] [-q]
+                              [--force] [-v] [-q]
                               name version
       packse build-pkg: error: the following arguments are required: name, version
 
@@ -146,7 +146,7 @@
     'stderr': '''
       usage: packse build-pkg [-h] [-t WHEEL_TAG] [--no-wheel]
                               [--requires-python REQUIRES_PYTHON] [--no-sdist]
-                              [--rm] [-v] [-q]
+                              [--force] [-v] [-q]
                               name version
       packse build-pkg: error: the following arguments are required: version