$ git clone -n https://src.fedoraproject.org/rpms/perl-CGI.git /var/lib/mock/f45-build-21937-588/root/chroot_tmpdir/scmroot/perl-CGI
Cloning into '/var/lib/mock/f45-build-21937-588/root/chroot_tmpdir/scmroot/perl-CGI'...
$ git fetch origin 49ff7c80557ce330b0d6b79527df1dd946042518:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CGI
 * [new ref]         49ff7c80557ce330b0d6b79527df1dd946042518 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49ff7c8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild