$ git clone -n https://src.fedoraproject.org/rpms/fedora-appstream-metadata.git /var/lib/mock/f45-build-8810-396/root/chroot_tmpdir/scmroot/fedora-appstream-metadata
Cloning into '/var/lib/mock/f45-build-8810-396/root/chroot_tmpdir/scmroot/fedora-appstream-metadata'...
$ git fetch origin 15141452e23106c6208668f5082d81c2f08f2de1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-appstream-metadata
 * [new ref]         15141452e23106c6208668f5082d81c2f08f2de1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1514145 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild