$ git clone -n https://src.fedoraproject.org/rpms/yasm.git /var/lib/mock/f40-build-2046411-48868/root/chroot_tmpdir/scmroot/yasm
Cloning into '/var/lib/mock/f40-build-2046411-48868/root/chroot_tmpdir/scmroot/yasm'...
$ git fetch origin 796f31fefa3dfbb21695120ff8848de29a45e4c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yasm
 * [new ref]         796f31fefa3dfbb21695120ff8848de29a45e4c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 796f31f Combine Artistic-1.0-Perl license with GPL-2.0-or-later.