Utility to validate semantic version strings and related operations
go get -u github.com/nmarley/semvertool/cmd/semvertoolExample validating SemVer:
# Example of a long-ass version string, silently exits with RC=0
> semvertool 3.4.0-dev.4+buildmeta1234
# Performs basic SemVer validation, useful for CI scripts
> semvertool malarkey
malarkey is not valid SemVer
# Has quiet mode, useful for CI scripts
> semvertool 3.4.0 --quiet;echo $?
0
> semvertool malarkey --quiet;echo $?
1Also prints version permutations:
# This is useful for Docker tagging
> semvertool 3.4.0 --show-permutations
3 3.4 3.4.0
# Can print prerelease...
> semvertool 1.2.3-beta.4+meta123 --prerelease
beta.4
# ... and also just prerelease 'head', e.g. the first part before the dot:
> semvertool 1.2.3-beta.4+meta123 --prerelease-head
beta
# Print permutations with prerelease 'head':
> semvertool 3.2.4-alpha --show-permutations
3-alpha 3.2-alpha 3.2.4-alphaThe main reason the -show-permutations flag exists is to use for Docker tagging, e.g. version 1.2.3 should return the strings 1.2.3, 1.2, and 1, as they are commonly applied to Docker images. Tags like like latest are not included in this tool and should be considered separately, as this only deals with version numbers.
For versions like 3.4.0-dev.4+buildmeta1234, it probably doesn't make sense to have tags a tag w/only major version + extra info like 3-dev.4+buildmeta1234. But for a normal version string like 1.2.3 then it might make more sense. It's up to the caller whether or not to use this flag.
Feel free to dive in! Open an issue or submit PRs.