$ git clone -n https://src.fedoraproject.org/rpms/golang-github-sgreben-flagvar.git /var/lib/mock/f38-build-side-42-init-devel-976394-28972/root/chroot_tmpdir/scmroot/golang-github-sgreben-flagvar
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-976394-28972/root/chroot_tmpdir/scmroot/golang-github-sgreben-flagvar'...
$ git fetch origin b9423ecc99c5cdfe0df1a92377f4150b063fba59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-sgreben-flagvar
 * [new ref]         b9423ecc99c5cdfe0df1a92377f4150b063fba59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9423ec Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild