$ git clone -n https://src.fedoraproject.org/rpms/golang-github-dimchansky-utfbom.git /var/lib/mock/f45-build-11861-435/root/chroot_tmpdir/scmroot/golang-github-dimchansky-utfbom
Cloning into '/var/lib/mock/f45-build-11861-435/root/chroot_tmpdir/scmroot/golang-github-dimchansky-utfbom'...
$ git fetch origin 012d2c5a905419cbc9499a5cd87e39132229133b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-dimchansky-utfbom
 * [new ref]         012d2c5a905419cbc9499a5cd87e39132229133b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 012d2c5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild