fix: bootstrap apps without version config

README.md

@@ -58,9 +58,11 @@ jobs:
 
       - name: Prepare version
         id: version
-        uses: Nurinda/bump-erp-app-version@v1
+        # The absolute URL is required when Gitea's DEFAULT_ACTIONS_URL is "github".
+        uses: https://gitea.cptckp.com/Nurinda/bump-erp-app-version@v1
         with:
           config-file: pyproject.toml
+          version-file: erp_operations/__init__.py
           base-branch: main
           target-branch: develop
           bump: patch
@@ -78,6 +80,7 @@ Gitea may suppress workflows caused by pushes authenticated with its built-in `G
 | Input | Default | Description |
 |---|---|---|
 | `config-file` | `pyproject.toml` | `bump-my-version` TOML configuration |
+| `version-file` | empty | App `__init__.py` used to bootstrap a base branch that predates the configuration |
 | `base-branch` | `main` | Branch providing the baseline version |
 | `target-branch` | `develop` | Checked-out branch receiving the commit |
 | `bump` | `patch` | `major`, `minor`, or `patch` |
@@ -101,6 +104,8 @@ Gitea may suppress workflows caused by pushes authenticated with its built-in `G
 
 The action does not force-push, create tags, publish releases, or call forge APIs. Concurrent release jobs are resolved safely by the remote rejecting a non-fast-forward push. Configure workflow-level concurrency if release PRs can overlap.
 
+For the first versioned release, the base branch might not contain `[tool.bumpversion]` yet. Set `version-file` to the app's `__init__.py`; the action will read its base-branch `__version__` as the bootstrap baseline. Once the configuration reaches the base branch, it becomes the authoritative baseline.
+
 ## Releasing the action
 
 Create and push an immutable semantic-version tag:

action.yml

@@ -5,6 +5,10 @@ inputs:
     description: Path to the bump-my-version TOML configuration
     required: false
     default: pyproject.toml
+  version-file:
+    description: App __init__.py used to bootstrap when the base branch has no bump-my-version config
+    required: false
+    default: ""
   base-branch:
     description: Branch whose version is used as the release baseline
     required: false
@@ -62,6 +66,7 @@ runs:
       shell: bash
       env:
         INPUT_CONFIG_FILE: ${{ inputs.config-file }}
+        INPUT_VERSION_FILE: ${{ inputs.version-file }}
         INPUT_BASE_BRANCH: ${{ inputs.base-branch }}
         INPUT_TARGET_BRANCH: ${{ inputs.target-branch }}
         INPUT_BUMP: ${{ inputs.bump }}

scripts/bump.sh

@@ -2,6 +2,7 @@
 set -euo pipefail
 
 : "${INPUT_CONFIG_FILE:?config-file is required}"
+: "${INPUT_VERSION_FILE:=}"
 : "${INPUT_BASE_BRANCH:?base-branch is required}"
 : "${INPUT_TARGET_BRANCH:?target-branch is required}"
 : "${INPUT_BUMP:?bump is required}"
@@ -45,7 +46,11 @@ git fetch "${INPUT_REMOTE}" \
 script_dir=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
 base_ref="refs/remotes/${INPUT_REMOTE}/${INPUT_BASE_BRANCH}"
 current_version=$(python3 "${script_dir}/read_version.py" "${INPUT_CONFIG_FILE}")
-base_version=$(python3 "${script_dir}/read_version.py" "${INPUT_CONFIG_FILE}" --ref "${base_ref}")
+base_version_args=("${INPUT_CONFIG_FILE}" --ref "${base_ref}")
+if [[ -n "${INPUT_VERSION_FILE}" ]]; then
+	base_version_args+=(--fallback-version-file "${INPUT_VERSION_FILE}")
+fi
+base_version=$(python3 "${script_dir}/read_version.py" "${base_version_args[@]}")
 
 comparison=$(python3 - "${current_version}" "${base_version}" <<'PY'
 import re

scripts/read_version.py

@@ -4,7 +4,9 @@
 from __future__ import annotations
 
 import argparse
+import re
 import subprocess
+import sys
 import tomllib
 
 
@@ -12,9 +14,35 @@ def parse_args() -> argparse.Namespace:
 	parser = argparse.ArgumentParser()
 	parser.add_argument("config_file")
 	parser.add_argument("--ref")
+	parser.add_argument("--fallback-version-file")
 	return parser.parse_args()
 
 
+def read_bootstrap_version(args: argparse.Namespace, config_error: KeyError) -> str:
+	if not args.ref or not args.fallback_version_file:
+		raise SystemExit(
+			f"Could not read tool.bumpversion.current_version from {args.config_file}: {config_error}"
+		) from config_error
+
+	try:
+		version_content = subprocess.check_output(
+			["git", "show", f"{args.ref}:{args.fallback_version_file}"],
+			text=True,
+		)
+	except (OSError, subprocess.CalledProcessError) as error:
+		raise SystemExit(
+			f"Could not load bootstrap version file {args.fallback_version_file}: {error}"
+		) from error
+
+	match = re.search(r'^__version__ = "(\d+\.\d+\.\d+)"$', version_content, re.MULTILINE)
+	if not match:
+		raise SystemExit(f"Could not read __version__ from bootstrap file {args.fallback_version_file}")
+
+	version = match.group(1)
+	print(f"Using bootstrap version {version} from {args.fallback_version_file}", file=sys.stderr)
+	return version
+
+
 def main() -> None:
 	args = parse_args()
 	try:
@@ -30,7 +58,9 @@ def main() -> None:
 
 	try:
 		version = tomllib.loads(content.decode())["tool"]["bumpversion"]["current_version"]
-	except (KeyError, TypeError, UnicodeDecodeError, tomllib.TOMLDecodeError) as error:
+	except KeyError as error:
+		version = read_bootstrap_version(args, error)
+	except (TypeError, UnicodeDecodeError, tomllib.TOMLDecodeError) as error:
 		raise SystemExit(
 			f"Could not read tool.bumpversion.current_version from {args.config_file}: {error}"
 		) from error

tests/integration.sh

@@ -12,6 +12,18 @@ git config user.name Test
 git config user.email test@example.com
 mkdir erp_operations
 cat > pyproject.toml <<'TOML'
+[project]
+name = "erp_operations"
+dynamic = ["version"]
+TOML
+printf '%s\n' '__version__ = "0.0.1"' > erp_operations/__init__.py
+git add .
+git commit -qm initial
+git remote add origin "${test_root}/remote.git"
+git push -qu origin main
+git switch -qc develop
+cat >> pyproject.toml <<'TOML'
+
 [tool.bumpversion]
 current_version = "0.0.1"
 commit = false
@@ -22,15 +34,12 @@ filename = "erp_operations/__init__.py"
 search = '__version__ = "{current_version}"'
 replace = '__version__ = "{new_version}"'
 TOML
-printf '%s\n' '__version__ = "0.0.1"' > erp_operations/__init__.py
-git add .
-git commit -qm initial
-git remote add origin "${test_root}/remote.git"
-git push -qu origin main
-git switch -qc develop
+git add pyproject.toml
+git commit -qm 'configure versioning'
 git push -qu origin develop
 
 export INPUT_CONFIG_FILE=pyproject.toml
+export INPUT_VERSION_FILE=erp_operations/__init__.py
 export INPUT_BASE_BRANCH=main
 export INPUT_TARGET_BRANCH=develop
 export INPUT_BUMP=patch