$ git clone -n https://src.fedoraproject.org/rpms/libcomps.git /var/lib/mock/f40-build-2219693-52640/root/chroot_tmpdir/scmroot/libcomps
Cloning into '/var/lib/mock/f40-build-2219693-52640/root/chroot_tmpdir/scmroot/libcomps'...
$ git fetch origin 32d6dd5c605d4553c30d8ddac80be80ddd4760ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcomps
 * [new ref]         32d6dd5c605d4553c30d8ddac80be80ddd4760ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32d6dd5 Backport upstream patch to fix C compatibility issue