$ git clone -n https://src.fedoraproject.org/rpms/tcl-mysqltcl.git /var/lib/mock/f42-build-868724-176246/root/chroot_tmpdir/scmroot/tcl-mysqltcl
Cloning into '/var/lib/mock/f42-build-868724-176246/root/chroot_tmpdir/scmroot/tcl-mysqltcl'...
$ git fetch origin f0e4d2f9d76b6627edab814cec3e2fdc958107b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-mysqltcl
 * [new ref]         f0e4d2f9d76b6627edab814cec3e2fdc958107b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0e4d2f Modified patch to support Tcl 8.x too