add build and version information if shallow copy or fork

[egypcio]

What this PR does / why we need it:

by merging this PR, we would:

• keep building normally as usual;
• ensure all changes met shellcheck's criterias;
• fix added ldflags via hack/version.sh;
• identify detailed version information that built the binaries (e.g.:clusterctl);
• log that the binary was built from a development source code.

tested on Linux and Mac.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

motivation behind these changes should fix:

• the check to abort the build process while no SEMVER was found was broken;
• ldflags didn't get properly added to the go build parameters;
• folks should be given a more precise information of the commit and tag that built the artifacts.

How to reproduce

reproduce.sh

/bin/sh reproduce.sh

clusterctl version current output

• official repo

clusterctl version: &version.Info{Major:"1", Minor:"12", GitVersion:"v1.12.0-rc.0.408-2056a9f66d773d", GitCommit:"2056a9f66d773d7f04e9e0a05afb8c4e5647e4ff", GitTreeState:"clean", BuildDate:"2026-03-07T08:19:35Z", GoVersion:"go1.25.7", Compiler:"gc", Platform:"linux/amd64"}

New clusterctl version available: v1.12.0-rc.0.408-2056a9f66d773d -> v1.12.3
sigs.k8s.io/cluster-api

• official repo (SHALLOW)

clusterctl version: &version.Info{Major:"", Minor:"", GitVersion:"", GitCommit:"", GitTreeState:"", BuildDate:"", GoVersion:"go1.25.7", Compiler:"gc", Platform:"linux/amd64"}

clusterctl version proposed output, if shallow or fork

clusterctl version: &version.Info{Major:"0", Minor:"0", GitVersion:"v0.0.0-fb881cc2b88072-fork", GitCommit:"fb881cc2b88072c42016a84f0e33ceeae79929d1", GitTreeState:"clean", BuildDate:"2026-03-07T08:25:50Z", GoVersion:"go1.25.7", Compiler:"gc", Platform:"linux/amd64"}

managers build target gets also the benefits of proposed changes

$ make clusterctl managers
$ find bin
bin
bin/kubeadm-control-plane-manager
bin/clusterctl
bin/manager
bin/capd-manager
bin/kubeadm-bootstrap-manager

• before

"Version:  (git commit: )" logger="setup"

• after

 "Version: v0.0.0-fb881cc2b88072-fork (git commit: fb881cc2b88072c42016a84f0e33ceeae79929d1)" logger="setup"

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @egypcio. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[egypcio]

/area clusterctl

[egypcio]

/area misc