$ git clone -n https://src.fedoraproject.org/rpms/libtiff.git /var/lib/mock/f45-build-17136-496/root/chroot_tmpdir/scmroot/libtiff
Cloning into '/var/lib/mock/f45-build-17136-496/root/chroot_tmpdir/scmroot/libtiff'...
$ git fetch origin f8063dac9fbfa5dc4bb3c4780a6925b2d8f906ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtiff
 * [new ref]         f8063dac9fbfa5dc4bb3c4780a6925b2d8f906ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8063da Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild