$ git clone -n https://src.fedoraproject.org/rpms/perl-IPC-Cmd.git /var/lib/mock/f40-build-2243589-53697/root/chroot_tmpdir/scmroot/perl-IPC-Cmd
Cloning into '/var/lib/mock/f40-build-2243589-53697/root/chroot_tmpdir/scmroot/perl-IPC-Cmd'...
$ git fetch origin 9b49204f109e4ff50987a3bdb6b0e974ede0dde5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IPC-Cmd
 * [new ref]         9b49204f109e4ff50987a3bdb6b0e974ede0dde5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b49204 Package tests