$ git clone -n https://src.fedoraproject.org/rpms/xdg-desktop-portal-cosmic.git /var/lib/mock/f42-build-59083067-6570930/root/chroot_tmpdir/scmroot/xdg-desktop-portal-cosmic
Cloning into '/var/lib/mock/f42-build-59083067-6570930/root/chroot_tmpdir/scmroot/xdg-desktop-portal-cosmic'...
$ git fetch origin 550921fd48ce5ce22d7e9ac9fcd632b68852bc69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xdg-desktop-portal-cosmic
 * [new ref]         550921fd48ce5ce22d7e9ac9fcd632b68852bc69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 550921f "Update to 1.0.0~alpha.7"