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// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: © 2019 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
/* of_diff.c - compare device tree files */
#include <common.h>
#include <fs.h>
#include <libfile.h>
#include <of.h>
#include <command.h>
#include <malloc.h>
#include <complete.h>
#include <errno.h>
#include <linux/err.h>
static struct device_node *get_tree(const char *filename, struct device_node *root)
{
struct device_node *node;
void *fdt;
size_t size;
int ret;
if (!strcmp(filename, "-")) {
node = of_get_root_node();
if (!node)
return ERR_PTR(-ENOENT);
return of_dup(node);
}
if (!strcmp(filename, "+")) {
node = of_get_root_node();
if (!node)
return ERR_PTR(-ENOENT);
node = of_dup(root);
of_fix_tree(node);
return node;
}
ret = read_file_2(filename, &size, &fdt, FILESIZE_MAX);
if (ret)
return ERR_PTR(ret);
node = of_unflatten_dtb(fdt);
free(fdt);
return node;
}
static int do_of_diff(int argc, char *argv[])
{
int ret = 0;
struct device_node *a, *b, *root;
if (argc < 3)
return COMMAND_ERROR_USAGE;
root = of_get_root_node();
a = get_tree(argv[1], root);
b = get_tree(argv[2], root);
if (IS_ERR(a)) {
printf("Cannot read %s: %pe\n", argv[1], a);
ret = COMMAND_ERROR;
a = NULL;
goto out;
}
if (IS_ERR(b)) {
printf("Cannot read %s: %pe\n", argv[2], b);
ret = COMMAND_ERROR;
b = NULL;
goto out;
}
of_diff(a, b, 0);
ret = 0;
out:
if (a && a != root)
of_delete_node(a);
if (b && b != root)
of_delete_node(b);
return ret;
}
BAREBOX_CMD_HELP_START(of_diff)
BAREBOX_CMD_HELP_TEXT("This command prints a diff between two given device trees.")
BAREBOX_CMD_HELP_TEXT("The device trees are given as dtb files or:")
BAREBOX_CMD_HELP_TEXT("'-' to compare against the barebox live tree, or")
BAREBOX_CMD_HELP_TEXT("'+' to compare against the fixed barebox live tree")
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(of_diff)
.cmd = do_of_diff,
BAREBOX_CMD_DESC("diff device trees")
BAREBOX_CMD_OPTS("<a> <b>")
BAREBOX_CMD_GROUP(CMD_GRP_MISC)
BAREBOX_CMD_HELP(cmd_of_diff_help)
BAREBOX_CMD_END
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