$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alecthomas-chroma-2.git /var/lib/mock/f38-build-side-42-init-devel-975916-28960/root/chroot_tmpdir/scmroot/golang-github-alecthomas-chroma-2
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-975916-28960/root/chroot_tmpdir/scmroot/golang-github-alecthomas-chroma-2'...
$ git fetch origin 45fba73e06d4d9df66cce42ef03d86b47d539de3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alecthomas-chroma-2
 * [new ref]         45fba73e06d4d9df66cce42ef03d86b47d539de3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45fba73 Update to 2.5.0