$ git clone -n https://src.fedoraproject.org/rpms/perl-CGI-Struct.git /var/lib/mock/f45-build-22007-589/root/chroot_tmpdir/scmroot/perl-CGI-Struct
Cloning into '/var/lib/mock/f45-build-22007-589/root/chroot_tmpdir/scmroot/perl-CGI-Struct'...
$ git fetch origin fc4bef7aa92e2cf143223706c5cf3948988533c4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CGI-Struct
 * [new ref]         fc4bef7aa92e2cf143223706c5cf3948988533c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc4bef7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild