Prepare git archival style testing

.git_archival.txt

@@ -0,0 +1,4 @@
+node: $Format:%H$
+node-date: $Format:%cI$
+describe-name: $Format:%(describe)$
+ref-names: $Format:%D$

.gitattributes

@@ -0,0 +1 @@
+.git_archival.txt  export-subst

MANIFEST.in

@@ -1,5 +1,6 @@
 exclude *.nix
 exclude .pre-commit-config.yaml
+exclude .git_archival.txt
 include *.py
 include testing/*.py
 include tox.ini

setup.cfg

@@ -59,6 +59,7 @@ setuptools_scm.parse_scm =
     .git = setuptools_scm.git:parse
 setuptools_scm.parse_scm_fallback =
     .hg_archival.txt = setuptools_scm.hg:parse_archival
+    .git_archival.txt = setuptools_scm.git:parse_archival
     PKG-INFO = setuptools_scm.hacks:parse_pkginfo
     pip-egg-info = setuptools_scm.hacks:parse_pip_egg_info
     setup.py = setuptools_scm.hacks:fallback_version

src/setuptools_scm/.git_archival.txt

@@ -0,0 +1,4 @@
+node: $Format:%H$
+node-date: $Format:%cI$
+describe-name: $Format:%(describe)$
+ref-names: $Format:%D$

src/setuptools_scm/git.py

@@ -1,4 +1,5 @@
 import os
+import re
 import warnings
 from datetime import date
 from datetime import datetime
@@ -8,10 +9,15 @@
 
 from .config import Configuration
 from .scm_workdir import Workdir
+from .utils import data_from_mime
 from .utils import do_ex
 from .utils import require_command
 from .utils import trace
 from .version import meta
+from .version import tags_to_versions
+
+REF_TAG_RE = re.compile(r"(?<=\btag: )([^,]+)\b")
+DESCRIBE_UNSUPPORTED = "%(describe"
 
 # If testing command in shell make sure to quote the match argument like
 # '*[0-9]*' as it will expand before being sent to git if there are any matching
@@ -231,3 +237,29 @@ def search_parent(dirname):
 
         if not tail:
             return None
+
+
+def archival_to_version(data, config=None):
+    trace("data", data)
+    archival_describe = data.get("describe-name", DESCRIBE_UNSUPPORTED)
+    if DESCRIBE_UNSUPPORTED in archival_describe:
+        warnings.warn("git archive did not support describe output")
+    else:
+        tag, number, node, _ = _git_parse_describe(archival_describe)
+        return meta(
+            tag,
+            config=config,
+            distance=None if number == 0 else number,
+            node=node,
+        )
+    versions = tags_to_versions(REF_TAG_RE.findall(data.get("ref-names", "")))
+    if versions:
+        return meta(versions[0], config=config)
+    else:
+        return meta("0.0", node=data.get("node"), config=config)
+
+
+def parse_archival(root, config=None):
+    archival = os.path.join(root, ".git_archival.txt")
+    data = data_from_mime(archival)
+    return archival_to_version(data, config=config)

testing/Dockerfile.rawhide-git

@@ -0,0 +1,7 @@
+FROM fedora:rawhide
+RUN dnf install git -y
+RUN git --version
+USER  1000:1000
+VOLUME /repo
+WORKDIR /repo
+ENTRYPOINT mkdir git-archived && git archive HEAD -o git-archived/archival.tar.gz

testing/test_git.py

@@ -9,10 +9,13 @@
 
 import pytest
 
+from setuptools_scm import Configuration
+from setuptools_scm import format_version
 from setuptools_scm import git
 from setuptools_scm import integration
 from setuptools_scm import NonNormalizedVersion
 from setuptools_scm.file_finder_git import git_find_files
+from setuptools_scm.git import archival_to_version
 from setuptools_scm.utils import do
 from setuptools_scm.utils import has_command
 
@@ -395,9 +398,7 @@ def parse_date():
     assert meta.node_date == today
 
 
-def test_git_getdate_badgit(
-    wd,
-):
+def test_git_getdate_badgit(wd):
     wd.commit_testfile()
     git_wd = git.GitWorkdir(os.fspath(wd.cwd))
     with patch.object(git_wd, "do_ex", Mock(return_value=("%cI", "", 0))):
@@ -435,3 +436,34 @@ def test_git_getdate_signed_commit(signed_commit_wd):
     signed_commit_wd.commit_testfile(signed=True)
     git_wd = git.GitWorkdir(os.fspath(signed_commit_wd.cwd))
     assert git_wd.get_head_date() == today
+
+
+@pytest.mark.parametrize(
+    "expected, from_data",
+    [
+        (
+            "1.0",
+            {"describe-name": "1.0-0-g0000"},
+        ),
+        (
+            "1.1.dev3+g0000",
+            {
+                "describe-name": "1.0-3-g0000",
+                "node": "0" * 20,
+            },
+        ),
+        ("0.0", {"node": "0" * 20}),
+        ("1.2.2", {"describe-name": "release-1.2.2-0-g00000"}),
+        ("1.2.2.dev0", {"ref-names": "tag: release-1.2.2.dev"}),
+    ],
+)
+@pytest.mark.filterwarnings("ignore:git archive did not support describe output")
+def test_git_archival_to_version(expected, from_data):
+    config = Configuration()
+    version = archival_to_version(from_data, config=config)
+    assert (
+        format_version(
+            version, version_scheme="guess-next-dev", local_scheme="node-and-date"
+        )
+        == expected
+    )

tox.ini

@@ -6,6 +6,7 @@ testpaths=testing
 filterwarnings=
     error
     ignore:.*tool\.setuptools_scm.*
+    ignore:.*git archive did not support describe output.*:UserWarning
 markers=
     issue(id): reference to github issue
     skip_commit: allows to skip committing in the helpers