$ git clone -n https://src.fedoraproject.org/rpms/perl-smartmatch.git /var/lib/mock/f41-build-816612-150289/root/chroot_tmpdir/scmroot/perl-smartmatch
Cloning into '/var/lib/mock/f41-build-816612-150289/root/chroot_tmpdir/scmroot/perl-smartmatch'...
$ git fetch origin c43a2a818bd2cf69c2a6f46f880a96f352917b3f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-smartmatch
 * [new ref]         c43a2a818bd2cf69c2a6f46f880a96f352917b3f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c43a2a8 Perl 5.40 rebuild