$ git clone -n https://src.fedoraproject.org/rpms/perl-CGI.git /var/lib/mock/f42-build-side-1-3499453-45965/root/chroot_tmpdir/scmroot/perl-CGI
Cloning into '/var/lib/mock/f42-build-side-1-3499453-45965/root/chroot_tmpdir/scmroot/perl-CGI'...
$ git fetch origin 3d7abd3df8c0199572cf6cc766ff31e020867d32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CGI
 * [new ref]         3d7abd3df8c0199572cf6cc766ff31e020867d32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d7abd3 4.68 bump (rhbz#2356535)