[for-next][PATCH 02/26] tools/bootconfig: Add list option

Steven Rostedt
2020-09-22T01:25:46Z

Add list option (-l) to show the bootconfig in the list style.
This is same output of /proc/bootconfig. So users can check
how their bootconfig will be shown in procfs. This will help
them to write a user-space script to parse the /proc/bootconfig.

Link: https://lkml.kernel.org/r/159704849087.175360.8761890802048625207.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
tools/bootconfig/main.c | 52 +++++++++++++++++++++++++++++++----------
1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
index d165e63b5d5a..78025267df20 100644
--- a/tools/bootconfig/main.c
+++ b/tools/bootconfig/main.c
@@ -14,18 +14,19 @@
#include <linux/kernel.h>
#include <linux/bootconfig.h>

-static int xbc_show_value(struct xbc_node *node)
+static int xbc_show_value(struct xbc_node *node, bool semicolon)
{
- const char *val;
+ const char *val, *eol;
char q;
int i = 0;

+ eol = semicolon ? ";\n" : "\n";
xbc_array_for_each_value(node, val) {
if (strchr(val, '"'))
q = '\'';
else
q = '"';
- printf("%c%s%c%s", q, val, q, node->next ? ", " : ";\n");
+ printf("%c%s%c%s", q, val, q, node->next ? ", " : eol);
i++;
}
return i;
@@ -53,7 +54,7 @@ static void xbc_show_compact_tree(void)
continue;
} else if (cnode && xbc_node_is_value(cnode)) {
printf("%s = ", xbc_node_get_data(node));
- xbc_show_value(cnode);
+ xbc_show_value(cnode, true);
} else {
printf("%s;\n", xbc_node_get_data(node));
}
@@ -77,6 +78,26 @@ static void xbc_show_compact_tree(void)
}
}

+static void xbc_show_list(void)
+{
+ char key[XBC_KEYLEN_MAX];
+ struct xbc_node *leaf;
+ const char *val;
+ int ret = 0;
+
+ xbc_for_each_key_value(leaf, val) {
+ ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
+ if (ret < 0)
+ break;
+ printf("%s = ", key);
+ if (!val || val[0] == '\0') {
+ printf("\"\"\n");
+ continue;
+ }
+ xbc_show_value(xbc_node_get_child(leaf), false);
+ }
+}
+
/* Simple real checksum */
int checksum(unsigned char *buf, int len)
{
@@ -233,7 +254,7 @@ static int init_xbc_with_error(char *buf, int len)
return ret;
}

-int show_xbc(const char *path)
+int show_xbc(const char *path, bool list)
{
int ret, fd;
char *buf = NULL;
@@ -267,7 +288,10 @@ int show_xbc(const char *path)
if (init_xbc_with_error(buf, ret) < 0)
goto out;
}
- xbc_show_compact_tree();
+ if (list)
+ xbc_show_list();
+ else
+ xbc_show_compact_tree();
ret = 0;
out:
free(buf);
@@ -390,7 +414,8 @@ int usage(void)
" Apply, delete or show boot config to initrd.\n"
" Options:\n"
" -a <config>: Apply boot config to initrd\n"
- " -d : Delete boot config file from initrd\n\n"
+ " -d : Delete boot config file from initrd\n"
+ " -l : list boot config in initrd or file\n\n"
" If no option is given, show the bootconfig in the given file.\n");
return -1;
}
@@ -399,10 +424,10 @@ int main(int argc, char **argv)
{
char *path = NULL;
char *apply = NULL;
- bool delete = false;
+ bool delete = false, list = false;
int opt;

- while ((opt = getopt(argc, argv, "hda:")) != -1) {
+ while ((opt = getopt(argc, argv, "hda:l")) != -1) {
switch (opt) {
case 'd':
delete = true;
@@ -410,14 +435,17 @@ int main(int argc, char **argv)
case 'a':
apply = optarg;
break;
+ case 'l':
+ list = true;
+ break;
case 'h':
default:
return usage();
}
}

- if (apply && delete) {
- pr_err("Error: You can not specify both -a and -d at once.\n");
+ if ((apply && delete) || (delete && list) || (apply && list)) {
+ pr_err("Error: You can give one of -a, -d or -l at once.\n");
return usage();
}

@@ -433,5 +461,5 @@ int main(int argc, char **argv)
else if (delete)
return delete_xbc(path);

- return show_xbc(path);
+ return show_xbc(path, list);
}
--
2.28.0