$ git clone -n https://src.fedoraproject.org/rpms/golang-github-mitchellh-copystructure.git /var/lib/mock/f45-build-12239-440/root/chroot_tmpdir/scmroot/golang-github-mitchellh-copystructure
Cloning into '/var/lib/mock/f45-build-12239-440/root/chroot_tmpdir/scmroot/golang-github-mitchellh-copystructure'...
$ git fetch origin 8b02722e86157a7dc2acdc43bf142beb9f90c3c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-mitchellh-copystructure
 * [new ref]         8b02722e86157a7dc2acdc43bf142beb9f90c3c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b02722 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild