$ git clone -n https://src.fedoraproject.org/rpms/courier-unicode.git /var/lib/mock/f45-build-6955-353/root/chroot_tmpdir/scmroot/courier-unicode
Cloning into '/var/lib/mock/f45-build-6955-353/root/chroot_tmpdir/scmroot/courier-unicode'...
$ git fetch origin 1db588b25a6035428dfcfd2237eab3e986e48d84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/courier-unicode
 * [new ref]         1db588b25a6035428dfcfd2237eab3e986e48d84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1db588b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild