$ git clone -n https://src.fedoraproject.org/rpms/tcl-tclvfs.git /var/lib/mock/f41-build-1041900-18994/root/chroot_tmpdir/scmroot/tcl-tclvfs
Cloning into '/var/lib/mock/f41-build-1041900-18994/root/chroot_tmpdir/scmroot/tcl-tclvfs'...
$ git fetch origin b7e516a44c9ee43af898a9089d2a1cad9b068709:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-tclvfs
 * [new ref]         b7e516a44c9ee43af898a9089d2a1cad9b068709 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7e516a Eliminate use of obsolete %patchN syntax (#2283636)