accept non-prerelease baseVersion (append -0.dev)

README.md

@@ -178,7 +178,11 @@ charts:
     # This gives you more control over development version tags
     # and lets you ensure prerelease tags are always sorted in the right order.
     # Only useful when publishing development releases.
-    baseVersion: 3.2.1-0.dev
+    # if this is not a prerelease version (no -suffix),
+    # the suffix `-0.dev` will be appended.
+    baseVersion: 3.2.1
+    # which is equivalent to
+    # baseVersion: 3.2.1-0.dev
 
     # The git repo whose gh-pages contains the charts. This can be a local
     # path such as "." as well but if matching <organization>/<repo> will be

chartpress.py

@@ -976,17 +976,17 @@ def _check_base_version(base_version):
     2. sort after the latest tag on the branch
     """
 
+    if "-" not in base_version:
+        # config version is a stable release,
+        # append default '-0.dev' so we always produce a prerelease
+        base_version = f"{base_version}-0.dev"
     # check valid value (baseVersion must be semver prerelease)
     match = _semver2.fullmatch(base_version)
     if not match:
         raise ValueError(
             f"baseVersion: {base_version} must be a valid semver prerelease (e.g. 1.2.3-0.dev), but doesn't appear to be valid."
         )
     base_version_groups = match.groupdict()
-    if not base_version_groups["prerelease"]:
-        raise ValueError(
-            f"baseVersion: {base_version} must be a valid semver prerelease (e.g. 1.2.3-0.dev), but is not a prerelease."
-        )
 
     def _version_number(groups):
         """Return comparable semver"""
@@ -1020,6 +1020,9 @@ def _version_number(groups):
             # tag not semver. ignore? Not really our problem.
             _log(f"Latest tag {tag} does not appear to be a semver version")
 
+    # return base_version, in case it was modified
+    return base_version
+
 
 class ActionStoreDeprecated(argparse.Action):
     """Used with argparse as a deprecation action."""
@@ -1183,7 +1186,7 @@ def main(argv=None):
             # (e.g. forgetting to update after release)
             base_version = chart.get("baseVersion", None)
             if base_version:
-                _check_base_version(base_version)
+                base_version = _check_base_version(base_version)
 
         if not args.list_images:
             # update Chart.yaml with a version

tests/test_helpers.py

@@ -162,35 +162,36 @@ def test__get_image_extra_build_command_options(git_repo):
 
 
 @pytest.mark.parametrize(
-    "base_version, tag, n_commits, status",
+    "base_version, tag, n_commits, result",
     [
         # OK, normal state
-        ("1.2.4-0.dev", "1.2.3", 10, "ok"),
+        ("1.2.4-0.dev", "1.2.3", 10, "1.2.4-0.dev"),
         # don't compare prereleases on the same tag
-        ("1.2.3-0.dev", "1.2.3-alpha.1", 10, "ok"),
+        ("1.2.3-0.dev", "1.2.3-alpha.1", 10, "1.2.3-0.dev"),
         # invalid baseVersion (not semver)
-        ("x.y.z", "1.2.3", 10, "valid semver prerelease"),
+        ("x.y.z", "1.2.3", 10, ValueError("valid semver pre")),
         # not prerelease baseVersion
-        ("1.2.4", "1.2.3", 10, "valid semver prerelease"),
+        ("1.2.4", "1.2.3", 10, "1.2.4-0.dev"),
         # check comparison with tag
-        ("1.2.2-0.dev", "1.2.3-alpha.1", 10, "is not greater"),
-        ("1.2.3-0.dev", "1.2.3", 10, "is not greater"),
-        ("1.2.3-0.dev", "2.0.0", 10, "is not greater"),
-        ("1.2.3-0.dev", "1.2.4-alpha.1", 10, "is not greater"),
+        ("1.2.2-0.dev", "1.2.3-alpha.1", 10, ValueError("is not greater")),
+        ("1.2.3-0.dev", "1.2.3", 10, ValueError("is not greater")),
+        ("1.2.3-0.dev", "2.0.0", 10, ValueError("is not greater")),
+        ("1.2.3-0.dev", "1.2.4-alpha.1", 10, ValueError("is not greater")),
         # don't check exactly on a tag
-        ("1.2.3-0.dev", "2.0.0", 0, "ok"),
+        ("1.2.3-0.dev", "2.0.0", 0, "1.2.3-0.dev"),
         # ignore invalid semver tags
-        ("1.2.3-0.dev", "x.y.z", 10, "ok"),
+        ("1.2.3-0.dev", "x.y.z", 10, "1.2.3-0.dev"),
     ],
 )
-def test_check_base_version(base_version, tag, n_commits, status):
+def test_check_base_version(base_version, tag, n_commits, result):
     with mock.patch.object(
         chartpress, "_get_latest_tag_and_count", lambda: (tag, n_commits)
     ):
-        if status == "ok":
-            chartpress._check_base_version(base_version)
-        else:
-            with pytest.raises(ValueError) as exc:
+        if isinstance(result, Exception):
+            with pytest.raises(result.__class__) as exc:
                 chartpress._check_base_version(base_version)
-            assert status in str(exc)
+            assert str(result) in str(exc)
             assert base_version in str(exc)
+        else:
+            used_version = chartpress._check_base_version(base_version)
+            assert used_version == result