$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Cookies.git /var/lib/mock/f45-build-23982-601/root/chroot_tmpdir/scmroot/perl-HTTP-Cookies
Cloning into '/var/lib/mock/f45-build-23982-601/root/chroot_tmpdir/scmroot/perl-HTTP-Cookies'...
$ git fetch origin ace51a1d20611840c0e36195e829add3444e3d0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Cookies
 * [new ref]         ace51a1d20611840c0e36195e829add3444e3d0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ace51a1 0.12 bump