$ git clone -n https://src.fedoraproject.org/rpms/perl-IPTables-libiptc.git /var/lib/mock/f45-build-24236-602/root/chroot_tmpdir/scmroot/perl-IPTables-libiptc
Cloning into '/var/lib/mock/f45-build-24236-602/root/chroot_tmpdir/scmroot/perl-IPTables-libiptc'...
$ git fetch origin fa21ec51ddf7420eab9a57bc42d36c4534401c52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IPTables-libiptc
 * [new ref]         fa21ec51ddf7420eab9a57bc42d36c4534401c52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa21ec5 Perl 5.44 rebuild