$ git clone -n https://src.fedoraproject.org/rpms/kguitar.git /var/lib/mock/f38-build-side-42-init-devel-694239-26969/root/chroot_tmpdir/scmroot/kguitar
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-694239-26969/root/chroot_tmpdir/scmroot/kguitar'...
$ git fetch origin dcc62b543832791743165b2892735104637a2238:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kguitar
 * [new ref]         dcc62b543832791743165b2892735104637a2238 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcc62b5 Fix build with autoconf-2.70+