$ git clone -n https://src.fedoraproject.org/rpms/golang-github-ttacon-chalk.git /var/lib/mock/f45-build-12563-442/root/chroot_tmpdir/scmroot/golang-github-ttacon-chalk
Cloning into '/var/lib/mock/f45-build-12563-442/root/chroot_tmpdir/scmroot/golang-github-ttacon-chalk'...
$ git fetch origin af34085a1b414c251dd7f73c8954285f318e3d09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-ttacon-chalk
 * [new ref]         af34085a1b414c251dd7f73c8954285f318e3d09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af34085 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild