Allow receiver to override encryption properties in case of replication

Currently, the receiver fails to override the encryption
property for the plain replicated dataset with the error:
"cannot receive incremental stream: encryption property
'encryption' cannot be set for incremental streams.". The
problem is resolved by allowing the receiver to override
the encryption property for plain replicated send.

Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>

lib/libzfs/libzfs_sendrecv.c

@@ -3966,6 +3966,15 @@ zfs_setup_cmdline_props(libzfs_handle_t *hdl, zfs_type_t type,
 			goto error;
 		}
 
+		/*
+		 * For plain replicated send, we can ignore encryption
+		 * properties other than first stream
+		 */
+		if ((zfs_prop_encryption_key_param(prop) || prop ==
+		    ZFS_PROP_ENCRYPTION) && !newfs && recursive && !raw) {
+			continue;
+		}
+
 		/* incremental streams can only exclude encryption properties */
 		if ((zfs_prop_encryption_key_param(prop) ||
 		    prop == ZFS_PROP_ENCRYPTION) && !newfs &&
@@ -4065,7 +4074,8 @@ zfs_setup_cmdline_props(libzfs_handle_t *hdl, zfs_type_t type,
 		if (cp != NULL)
 			*cp = '\0';
 
-		if (!raw && zfs_crypto_create(hdl, namebuf, voprops, NULL,
+		if (!raw && !(!newfs && recursive) &&
+		    zfs_crypto_create(hdl, namebuf, voprops, NULL,
 		    B_FALSE, wkeydata_out, wkeylen_out) != 0) {
 			fnvlist_free(voprops);
 			ret = zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);

tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_to_encrypted.ksh

@@ -41,6 +41,9 @@ verify_runnable "both"
 
 function cleanup
 {
+	datasetexists $TESTPOOL/encrypted && \
+		destroy_dataset $TESTPOOL/encrypted -r
+
 	snapexists $snap && destroy_dataset $snap -f
 	snapexists $snap2 && destroy_dataset $snap2 -f
 
@@ -97,4 +100,15 @@ log_note "Verifying ZFS will not receive to an encrypted child when the" \
 	"parent key is unloaded"
 log_mustnot eval "zfs send $snap | zfs receive $TESTPOOL/$TESTFS1/c4"
 
+# Verify that replication can override encryption properties
+log_note "Verifying replication can override encryption properties for plain dataset"
+typeset key_location="/$TESTPOOL/pkey1"
+log_must eval "echo $passphrase > $key_location"
+log_must eval "zfs send -R $snap2 | zfs recv -s -F -o encryption=on" \
+	"-o keyformat=passphrase -o keylocation=file://$key_location" \
+	"-o mountpoint=none $TESTPOOL/encrypted"
+log_must test "$(get_prop 'encryption' $TESTPOOL/encrypted)" != "off"
+log_must test "$(get_prop 'keyformat' $TESTPOOL/encrypted)" == "passphrase"
+log_must test "$(get_prop 'keylocation' $TESTPOOL/encrypted)" == "file://$key_location"
+
 log_pass "ZFS can receive encrypted filesystems into child dataset"