Port deprecated conda.auxlib.packaging.get_version_from_git_tag to …

…`conda_build` (#5221)

conda_build/conda_interface.py

@@ -8,9 +8,6 @@
 from importlib import import_module  # noqa: F401
 
 from conda import __version__ as CONDA_VERSION  # noqa: F401
-from conda.auxlib.packaging import (  # noqa: F401
-    _get_version_from_git_tag as get_version_from_git_tag,
-)
 from conda.base.context import context, determine_target_prefix, reset_context
 from conda.base.context import non_x86_machines as non_x86_linux_machines  # noqa: F401
 from conda.core.package_cache import ProgressiveFetchExtract  # noqa: F401
@@ -117,3 +114,14 @@ def handle_proxy_407(x, y):
 )
 def md5_file(path: str | os.PathLike) -> str:
     return compute_sum(path, "md5")
+
+
+@deprecated(
+    "24.3",
+    "24.5",
+    addendum="Use `conda_build.environ.get_version_from_git_tag` instead.",
+)
+def get_version_from_git_tag(tag):
+    from .environ import get_version_from_git_tag
+
+    return get_version_from_git_tag(tag)

conda_build/environ.py

@@ -48,7 +48,6 @@
     TemporaryDirectory,
     context,
     create_default_packages,
-    get_version_from_git_tag,
     pkgs_dirs,
     reset_context,
     root_dir,
@@ -223,6 +222,24 @@ def verify_git_repo(
     return OK
 
 
+GIT_DESCRIBE_REGEX = re.compile(
+    r"(?:[_-a-zA-Z]*)"
+    r"(?P<version>[a-zA-Z0-9.]+)"
+    r"(?:-(?P<post>\d+)-g(?P<hash>[0-9a-f]{7,}))$"
+)
+
+
+def get_version_from_git_tag(tag):
+    """Return a PEP440-compliant version derived from the git status.
+    If that fails for any reason, return the changeset hash.
+    """
+    m = GIT_DESCRIBE_REGEX.match(tag)
+    if m is None:
+        return None
+    version, post_commit, hash = m.groups()
+    return version if post_commit == "0" else f"{version}.post{post_commit}+{hash}"
+
+
 def get_git_info(git_exe, repo, debug):
     """
     Given a repo to a git repo, return a dictionary of:

news/5221-deprecate-get_version_from_git_tag

@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* Mark `conda_build.conda_interface.get_version_from_git_tag` as deprecated. Use `conda_build.environ.get_version_from_git_tag` instead. (#5221)
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>