$ git clone -n https://src.fedoraproject.org/rpms/perl-Sub-Name.git /var/lib/mock/f45-build-26372-617/root/chroot_tmpdir/scmroot/perl-Sub-Name
Cloning into '/var/lib/mock/f45-build-26372-617/root/chroot_tmpdir/scmroot/perl-Sub-Name'...
$ git fetch origin f7fd7f79def13da79baf00311221aaaa43e14a48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sub-Name
 * [new ref]         f7fd7f79def13da79baf00311221aaaa43e14a48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7fd7f7 Perl 5.44 rebuild