$ git clone -n https://src.fedoraproject.org/rpms/tcl-signal.git /var/lib/mock/f41-build-725800-13123/root/chroot_tmpdir/scmroot/tcl-signal
Cloning into '/var/lib/mock/f41-build-725800-13123/root/chroot_tmpdir/scmroot/tcl-signal'...
$ git fetch origin 38cec1635764480506e3b1efd4adb40fd7590277:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-signal
 * [new ref]         38cec1635764480506e3b1efd4adb40fd7590277 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38cec16 Eliminate use of obsolete %patchN syntax (#2283636)