$ git clone -n https://src.fedoraproject.org/rpms/perl-Struct-Dumb.git /var/lib/mock/f45-build-26380-617/root/chroot_tmpdir/scmroot/perl-Struct-Dumb
Cloning into '/var/lib/mock/f45-build-26380-617/root/chroot_tmpdir/scmroot/perl-Struct-Dumb'...
$ git fetch origin 802e365ae86dfd767b1c29a7990ebdce1c5ffddc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Struct-Dumb
 * [new ref]         802e365ae86dfd767b1c29a7990ebdce1c5ffddc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 802e365 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild