$ git clone -n https://src.fedoraproject.org/rpms/golang-github-jackc-chunkreader-2.git /var/lib/mock/f45-build-12077-437/root/chroot_tmpdir/scmroot/golang-github-jackc-chunkreader-2
Cloning into '/var/lib/mock/f45-build-12077-437/root/chroot_tmpdir/scmroot/golang-github-jackc-chunkreader-2'...
$ git fetch origin 67c68e2f360da7da53f8354913733ac3ac0c09b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-jackc-chunkreader-2
 * [new ref]         67c68e2f360da7da53f8354913733ac3ac0c09b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67c68e2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild