$ git clone -n https://src.fedoraproject.org/rpms/perl-Test2-Plugin-UUID.git /var/lib/mock/f42-build-side-1-3499358-45964/root/chroot_tmpdir/scmroot/perl-Test2-Plugin-UUID
Cloning into '/var/lib/mock/f42-build-side-1-3499358-45964/root/chroot_tmpdir/scmroot/perl-Test2-Plugin-UUID'...
$ git fetch origin 3ac8443e755fd2b645a2583f3cbf6bdc97ae8035:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test2-Plugin-UUID
 * [new ref]         3ac8443e755fd2b645a2583f3cbf6bdc97ae8035 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ac8443 0.002010 bump