$ git clone -n https://src.fedoraproject.org/rpms/libtree.git /var/lib/mock/f45-build-17132-496/root/chroot_tmpdir/scmroot/libtree
Cloning into '/var/lib/mock/f45-build-17132-496/root/chroot_tmpdir/scmroot/libtree'...
$ git fetch origin d8f98a6702a77f3f236ddbc17f36d787d7c6ea42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtree
 * [new ref]         d8f98a6702a77f3f236ddbc17f36d787d7c6ea42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8f98a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild