$ git clone -n https://src.fedoraproject.org/rpms/fastfetch.git /var/lib/mock/f40-build-1507290-23890/root/chroot_tmpdir/scmroot/fastfetch
Cloning into '/var/lib/mock/f40-build-1507290-23890/root/chroot_tmpdir/scmroot/fastfetch'...
$ git fetch origin aa37296d208304427cc574320896616c453f6337:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fastfetch
 * [new ref]         aa37296d208304427cc574320896616c453f6337 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa37296 update sources