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#!/usr/bin/env python
"""A simple script to validate that a git tag matches a SemVer pattern."""
import re
import subprocess
SEMVER_SIMPLE = re.compile(r'(\d+)\.(\d+)\.(\d+)((a|b|rc)(\d+))?')
SEMVER_PATTERN = re.compile(
r"""
^ # Start of the string
v? # Optional 'v' prefix (common in Git tags)
(?P<major>0|[1-9]\d*)\. # Major version
(?P<minor>0|[1-9]\d*)\. # Minor version
(?P<patch>0|[1-9]\d*) # Patch version
(?:-(?P<prerelease> # Optional pre-release section
(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*) # Identifier
(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*
))?
(?:\+(?P<build> # Optional build metadata section
[0-9a-zA-Z-]+ # Identifier
(?:\.[0-9a-zA-Z-]+)*
))?
$ # End of the string
""",
re.VERBOSE,
)
def get_current_tag() -> str:
"""Get current git tag."""
try:
# Gets the name of the latest tag reachable from the current commit
result = subprocess.run(
['git', 'describe', '--exact-match', '--tags', '--abbrev=0'], capture_output=True, text=True, check=True
)
return result.stdout.strip()
except subprocess.CalledProcessError:
print("Could not find a reachable tag.")
return ''
def is_semantic_version(tag_name: str) -> bool:
"""Check if a given string complies with the semantic versioning 2.0.0 specification.
Args:
tag_name: The name of the Git tag to validate.
Returns:
bool: True if the tag is a valid semantic version, False otherwise.
"""
# The regex pattern for semantic versioning 2.0.0 (source: https://semver.org/)
semver_pattern = re.compile(
r"""
^ # Start of the string
v? # Optional 'v' prefix (common in Git tags)
(?P<major>0|[1-9]\d*)\. # Major version
(?P<minor>0|[1-9]\d*)\. # Minor version
(?P<patch>0|[1-9]\d*) # Patch version
(?:-(?P<prerelease> # Optional pre-release section
(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*) # Identifier
(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*
))?
(?:\+(?P<build> # Optional build metadata section
[0-9a-zA-Z-]+ # Identifier
(?:\.[0-9a-zA-Z-]+)*
))?
$ # End of the string
""",
re.VERBOSE,
)
return bool(semver_pattern.match(tag_name))
if __name__ == '__main__':
import sys
git_tag = get_current_tag()
if not git_tag:
print('Git tag does not exist for current commit.')
sys.exit(-1)
if not is_semantic_version(git_tag):
print(rf"Git tag '{git_tag}' is invalid according to SemVer.")
sys.exit(-1)
print(rf"Git tag '{git_tag}' is valid.")
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