$ git clone -n https://src.fedoraproject.org/rpms/xca.git /var/lib/mock/f40-build-2164385-50972/root/chroot_tmpdir/scmroot/xca
Cloning into '/var/lib/mock/f40-build-2164385-50972/root/chroot_tmpdir/scmroot/xca'...
$ git fetch origin b3f37b4db97bd6a4916cfeea19800816c702464a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xca
 * [new ref]         b3f37b4db97bd6a4916cfeea19800816c702464a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3f37b4 Explicitly BuildRequire python3-sphinxcontrib-qthelp