$ git clone -n https://src.fedoraproject.org/rpms/perl-Call-Context.git /var/lib/mock/f45-build-22213-590/root/chroot_tmpdir/scmroot/perl-Call-Context
Cloning into '/var/lib/mock/f45-build-22213-590/root/chroot_tmpdir/scmroot/perl-Call-Context'...
$ git fetch origin 3b83cf25f6287dc1fc7c3705589d5e0dd08fe01e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Call-Context
 * [new ref]         3b83cf25f6287dc1fc7c3705589d5e0dd08fe01e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b83cf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild