$ git clone -n https://src.fedoraproject.org/rpms/rust-copypasta.git /var/lib/mock/f45-build-40981-778/root/chroot_tmpdir/scmroot/rust-copypasta
Cloning into '/var/lib/mock/f45-build-40981-778/root/chroot_tmpdir/scmroot/rust-copypasta'...
$ git fetch origin 4028b2ec8864e98a16c7109b5013a59af444f364:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-copypasta
 * [new ref]         4028b2ec8864e98a16c7109b5013a59af444f364 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4028b2e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild