$ git clone -n https://src.fedoraproject.org/rpms/libcgif.git /var/lib/mock/f45-build-15981-481/root/chroot_tmpdir/scmroot/libcgif
Cloning into '/var/lib/mock/f45-build-15981-481/root/chroot_tmpdir/scmroot/libcgif'...
$ git fetch origin 2e6b34b32639f9db4f7edab4b4b429644d85db49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcgif
 * [new ref]         2e6b34b32639f9db4f7edab4b4b429644d85db49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e6b34b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild