$ git clone -n https://src.fedoraproject.org/rpms/xfce4-dev-tools.git /var/lib/mock/f39-build-1847803-42162/root/chroot_tmpdir/scmroot/xfce4-dev-tools
Cloning into '/var/lib/mock/f39-build-1847803-42162/root/chroot_tmpdir/scmroot/xfce4-dev-tools'...
$ git fetch origin a774657bf29c7db8d272f50c8fd1b4b7fd19e572:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-dev-tools
 * [new ref]         a774657bf29c7db8d272f50c8fd1b4b7fd19e572 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a774657 Update to v4.18.1; add libxslt-devel as BR