$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-CookieJar.git /var/lib/mock/f40-build-2239203-53605/root/chroot_tmpdir/scmroot/perl-HTTP-CookieJar
Cloning into '/var/lib/mock/f40-build-2239203-53605/root/chroot_tmpdir/scmroot/perl-HTTP-CookieJar'...
$ git fetch origin 2276cbb03e91bd05e4b1b6402285ea04eb3bd5bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-CookieJar
 * [new ref]         2276cbb03e91bd05e4b1b6402285ea04eb3bd5bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2276cbb General spec update