$ git clone -n https://src.fedoraproject.org/rpms/rust-tree_magic_db.git /var/lib/mock/f45-build-45740-825/root/chroot_tmpdir/scmroot/rust-tree_magic_db
Cloning into '/var/lib/mock/f45-build-45740-825/root/chroot_tmpdir/scmroot/rust-tree_magic_db'...
$ git fetch origin 8ee0fa916a73bcd02706a11bbfa9117ce4744534:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tree_magic_db
 * [new ref]         8ee0fa916a73bcd02706a11bbfa9117ce4744534 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ee0fa9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild