$ git clone -n https://src.fedoraproject.org/rpms/itcl.git /var/lib/mock/f45-build-14259-458/root/chroot_tmpdir/scmroot/itcl
Cloning into '/var/lib/mock/f45-build-14259-458/root/chroot_tmpdir/scmroot/itcl'...
$ git fetch origin 17cfc49ec3a226f2a0f321fd6ff6eae6e1c2d4dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/itcl
 * [new ref]         17cfc49ec3a226f2a0f321fd6ff6eae6e1c2d4dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17cfc49 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild