$ git clone -n https://src.fedoraproject.org/rpms/tcl.git /var/lib/mock/f41-build-1164676-21583/root/chroot_tmpdir/scmroot/tcl
Cloning into '/var/lib/mock/f41-build-1164676-21583/root/chroot_tmpdir/scmroot/tcl'...
$ git fetch origin dedcb67c9b58c9b3760902648d619178a1bee59a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl
 * [new ref]         dedcb67c9b58c9b3760902648d619178a1bee59a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dedcb67 Fix flatpak build