commands: add new stat command

We have a couple of commands to help with debugging the VFS:
ll, devinfo, devlookup, but we lack a command that can just dump all
information we have in a struct stat or struct cdev. Add stat as such a
command. For most uses, it's not needed, but it can come in handy for
development. The stat_print and cdev_print functions underlying it are
exported, so they can called for debugging purposes.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20221026063819.2355568-1-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 77 insertions, 0 deletions

diff --git a/commands/Kconfig b/commands/Kconfig
index 9894ecb9aa..2ce990b561 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -947,6 +947,20 @@ config CMD_LS
 		  -C	column format (opposite of long format)
 		  -R	list subdirectories recursively
 
+config CMD_STAT
+	tristate
+	prompt "stat"
+	select PRINTF_UUID
+	help
+	  Display file status
+
+	  Usage: stat [-L] [FILEDIR...]
+
+	  Display status information about the specified files or directories.
+
+	  Options:
+		  -L	follow symlinks
+
 config CMD_MD5SUM
 	tristate
 	select COMPILE_HASH
diff --git a/commands/Makefile b/commands/Makefile
index 068fbb32da..68d0d05365 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_CMD_POWEROFF)	+= poweroff.o
 obj-$(CONFIG_CMD_GO)		+= go.o
 obj-$(CONFIG_CMD_PARTITION)	+= partition.o
 obj-$(CONFIG_CMD_LS)		+= ls.o
+obj-$(CONFIG_CMD_STAT)		+= stat.o
 obj-$(CONFIG_CMD_CD)		+= cd.o
 obj-$(CONFIG_CMD_PWD)		+= pwd.o
 obj-$(CONFIG_CMD_MKDIR)		+= mkdir.o
diff --git a/commands/stat.c b/commands/stat.c
new file mode 100644
index 0000000000..153eac50f1
--- /dev/null
+++ b/commands/stat.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: © 2022 Ahmad Fatoum, Pengutronix
+
+#include <common.h>
+#include <command.h>
+#include <fs.h>
+#include <linux/stat.h>
+#include <errno.h>
+#include <malloc.h>
+#include <getopt.h>
+#include <stringlist.h>
+
+static int do_stat(int argc, char *argv[])
+{
+	int (*statfn)(const char *, struct stat *) = lstat;
+	int ret, opt, exitcode = 0;
+	char **filename;
+	struct stat st;
+
+	while((opt = getopt(argc, argv, "L")) > 0) {
+		switch(opt) {
+		case 'L':
+			statfn = stat;
+			break;
+		default:
+			return COMMAND_ERROR_USAGE;
+		}
+	}
+
+	if (optind == argc)
+		return COMMAND_ERROR_USAGE;
+
+	for (filename = &argv[optind]; *filename; filename++) {
+		ret = statfn(*filename, &st);
+
+		if (ret) {
+			printf("%s: %s: %m\n", argv[0], *filename);
+			exitcode = COMMAND_ERROR;
+			continue;
+		}
+
+		stat_print(*filename, &st);
+	}
+
+	return exitcode;
+}
+
+BAREBOX_CMD_HELP_START(stat)
+BAREBOX_CMD_HELP_TEXT("Display status information about the specified files")
+BAREBOX_CMD_HELP_TEXT("or directories.")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-L",  "follow links")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(stat)
+	.cmd		= do_stat,
+	BAREBOX_CMD_DESC("display file status")
+	BAREBOX_CMD_OPTS("[-L] [FILEDIR...]")
+	BAREBOX_CMD_GROUP(CMD_GRP_FILE)
+	BAREBOX_CMD_HELP(cmd_stat_help)
+BAREBOX_CMD_END