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version: Move vX.Y.Z to version.go so it works with go get, add git info
#304
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… info Previously, building with `make` was required for `version` command to output v0.15.0; `go get` or `go build` would always tell you v0.0.0-unset. Now the basic vX.Y.Z is always available, and when building with `make` git information is appended: $ go run . version v0.15.0 built from git (unknown) $ out/container-diff version v0.15.0 built from git v0.15.0-1-gcd5a837-dirty
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BTW, I don't think README says how to build from source, initially I didn't notice the Makefile and assumed |
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Followup from #293.
Previously, building with
makewas required forversioncommand to output "v0.15.0"; if you justgo getor clone andgo build .it would always tell you "v0.0.0-unset" :-(Now the basic vX.Y.Z is always available, and when building with
makegit information is appended:(I added
version --shortmode formake releaseto be able to extract the const embedded in version.go without anything else. IMHO that's cleaner than slicing the output ofversionbut could go either way.)Alternatives:
golang/go#22147, golang/go#29814 explore several directions for letting binaries know which git they were built from. ldflags is indeed main current way.
Most of these don't work with bare
go get.(
go generateis not an option as go get won't run it, it's intended for the author to run and commit)Go 1.12 has new
debug.ReadBuildInfo()api that's supposed to automagically provide build info without needing ldflags, but only if you use go modules (?) and people reported some issues using it: golang/go#29228. See also golang-migrate/migrate#172 for example attempt at using that.