tests: Get a file through an absolute symlink within a subdirectory

This shows that read_symlink_reparse() is broken when trying to
replace an absolute with a relative filename within a
share.

read_symlink_reparse() is used only in openat_pathref_fsp_nosymlink()
so far to chase symlinks for non-lcomp path components. Chasing lcomp
symlinks is done through non_widelink_open(), which gets it right.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=15505

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

selftest/knownfail.d/bug-15505

@@ -0,0 +1 @@
+^samba3.blackbox.smbclient_s3.*.follow\ local\ symlinks.*

source3/script/tests/test_smbclient_s3.sh

@@ -1492,6 +1492,17 @@ EOF
 		return
 	fi
 
+	# Create a file to be accessed behind the symlink
+	touch $local_slink_target_dir/x
+	ret=$?
+	if [ $ret -ne 0 ]; then
+		echo "$out"
+		echo "failed - unable to create file"
+		ls -la $local_test_dir
+		false
+		return
+	fi
+
 	# Can we cd into the symlink name and ls ?
 	tmpfile=$PREFIX/smbclient_interactive_prompt_commands
 	cat >$tmpfile <<EOF
@@ -1521,6 +1532,34 @@ EOF
 		return
 	fi
 
+	# Can we get the test file behind the symlink'ed dir?
+	tmpfile=$PREFIX/smbclient_interactive_prompt_commands
+	cat >$tmpfile <<EOF
+get $share_test_dir\\sym_name\\x -
+quit
+EOF
+	cmd='CLI_FORCE_INTERACTIVE=yes $SMBCLIENT "$@" -U$USERNAME%$PASSWORD //$SERVER/local_symlinks -I $SERVER_IP $LOCAL_ADDARGS < $tmpfile 2>&1'
+	eval echo "$cmd"
+	out=$(eval $cmd)
+	ret=$?
+	rm -f $tmpfile
+
+	if [ $ret -ne 0 ]; then
+		echo "$out"
+		echo "failed accessing local_symlinks with error $ret"
+		false
+		return
+	fi
+
+	echo "$out" | grep 'NT_STATUS_'
+	ret=$?
+	if [ $ret -eq 0 ]; then
+		echo "$out"
+		echo "failed - got an NT_STATUS error"
+		false
+		return
+	fi
+
 	# CLEANUP
 	rm -f $local_slink_name