$ git clone -n https://src.fedoraproject.org/rpms/golang-github-sgreben-flagvar.git /var/lib/mock/f39-build-1507836-35310/root/chroot_tmpdir/scmroot/golang-github-sgreben-flagvar
Cloning into '/var/lib/mock/f39-build-1507836-35310/root/chroot_tmpdir/scmroot/golang-github-sgreben-flagvar'...
$ git fetch origin 8fce46e0b4ec2df95c852f52dbd28a312bc071fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-sgreben-flagvar
 * [new ref]         8fce46e0b4ec2df95c852f52dbd28a312bc071fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fce46e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild