btrfs-progs: fi show: remove stray newline in filesystem show

Remove last newline in the output of 'btrfs filesystem show', keep the
line between two filesystems so the devices are visually grouped
togehter.

Pull-request: #866
Author: Matt Langford <github@matt.boats>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: mattlangford

cmds/filesystem.c

@@ -365,7 +365,6 @@ static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
 	if (devs_found < total) {
 		pr_verbose(LOG_DEFAULT, "\t*** Some devices missing\n");
 	}
-	pr_verbose(LOG_DEFAULT, "\n");
 }
 
 /* adds up all the used spaces as reported by the space info ioctl
@@ -431,7 +430,6 @@ static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 		free(canonical_path);
 	}
 
-	pr_verbose(LOG_DEFAULT, "\n");
 	return 0;
 }
 
@@ -481,6 +479,10 @@ static int btrfs_scan_kernel(void *search, unsigned unit_mode)
 
 		fd = open(mnt->mnt_dir, O_RDONLY);
 		if ((fd != -1) && !get_df(fd, &space_info_arg)) {
+			/* Put space between filesystem entries for readability. */
+			if (found != 0)
+				pr_verbose(LOG_DEFAULT, "\n");
+
 			print_one_fs(&fs_info_arg, dev_info_arg,
 				     space_info_arg, label, unit_mode);
 			free(space_info_arg);
@@ -757,6 +759,7 @@ static int cmd_filesystem_show(const struct cmd_struct *cmd,
 	char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
 	unsigned unit_mode;
 	int found = 0;
+	bool needs_newline = false;
 
 	unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 
@@ -845,6 +848,12 @@ static int cmd_filesystem_show(const struct cmd_struct *cmd,
 		goto out;
 	}
 
+	/*
+	 * The above call will return 0 if it found anything, in those cases we
+	 * need an extra newline below.
+	 */
+	needs_newline = !ret;
+
 	/* shows mounted only */
 	if (where == BTRFS_SCAN_MOUNTED)
 		goto out;
@@ -882,8 +891,14 @@ static int cmd_filesystem_show(const struct cmd_struct *cmd,
 		goto out;
 	}
 
-	list_for_each_entry(fs_devices, &all_uuids, fs_list)
+	list_for_each_entry(fs_devices, &all_uuids, fs_list) {
+		/* Put space between filesystem entries for readability. */
+		if (needs_newline)
+			pr_verbose(LOG_DEFAULT, "\n");
+
 		print_one_uuid(fs_devices, unit_mode);
+		needs_newline = true;
+	}
 
 	if (search && !found) {
 		error("not a valid btrfs filesystem: %s", search);