$ git clone -n https://src.fedoraproject.org/rpms/perl-Perl-Tags.git /var/lib/mock/f41-build-1108035-20090/root/chroot_tmpdir/scmroot/perl-Perl-Tags
Cloning into '/var/lib/mock/f41-build-1108035-20090/root/chroot_tmpdir/scmroot/perl-Perl-Tags'...
$ git fetch origin 4534faf4d76d15b2f24ec698c8810286892ddc38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Perl-Tags
 * [new ref]         4534faf4d76d15b2f24ec698c8810286892ddc38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4534faf Eliminate use of obsolete %patchN syntax (#2283636)