$ git clone -n https://src.fedoraproject.org/rpms/perl-CGI.git /var/lib/mock/f39-build-1441714-32406/root/chroot_tmpdir/scmroot/perl-CGI
Cloning into '/var/lib/mock/f39-build-1441714-32406/root/chroot_tmpdir/scmroot/perl-CGI'...
$ git fetch origin 8906ecf915a1cda9bd566318b2085f22b07b869a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CGI
 * [new ref]         8906ecf915a1cda9bd566318b2085f22b07b869a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8906ecf 4.59 bump (rhbz#2241705)