$ git clone -n https://src.fedoraproject.org/rpms/poppler-data.git /var/lib/mock/f45-build-28768-633/root/chroot_tmpdir/scmroot/poppler-data
Cloning into '/var/lib/mock/f45-build-28768-633/root/chroot_tmpdir/scmroot/poppler-data'...
$ git fetch origin 6fc4bcbdf33a6d1dd896f9f288e2beba2b22493f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/poppler-data
 * [new ref]         6fc4bcbdf33a6d1dd896f9f288e2beba2b22493f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fc4bcb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild