$ git clone -n https://src.fedoraproject.org/rpms/perl-Readonly-XS.git /var/lib/mock/f45-build-26019-614/root/chroot_tmpdir/scmroot/perl-Readonly-XS
Cloning into '/var/lib/mock/f45-build-26019-614/root/chroot_tmpdir/scmroot/perl-Readonly-XS'...
$ git fetch origin f222f007987d6300faa2c3a6c5e0fbd42b57576f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Readonly-XS
 * [new ref]         f222f007987d6300faa2c3a6c5e0fbd42b57576f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f222f00 Perl 5.44 rebuild