$ git clone -n https://src.fedoraproject.org/rpms/libpciaccess.git /var/lib/mock/f45-build-16746-490/root/chroot_tmpdir/scmroot/libpciaccess
Cloning into '/var/lib/mock/f45-build-16746-490/root/chroot_tmpdir/scmroot/libpciaccess'...
$ git fetch origin f5023bb4eff8150c79fc55b8b3fa084c3a2121ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpciaccess
 * [new ref]         f5023bb4eff8150c79fc55b8b3fa084c3a2121ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5023bb rebase 0.19