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Message-Id: <20220608095456.27479-1-zev@bewilderbeest.net>
Date: Wed, 8 Jun 2022 02:54:56 -0700
From: Zev Weiss <zev@...ilderbeest.net>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Zev Weiss <zev@...ilderbeest.net>, linux-kbuild@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] kconfig: Add findconf script and helper program
scripts/findconf provides menuconfig's search functionality as a
standalone, non-interactive command, somewhat in the spirit of
scripts/config. It is meant to be useful for tasks like getting a
quick overview of symbol dependencies or determining which Kconfig
file to edit for a given symbol, without having to fire up one of the
interactive config programs.
It accepts a single command-line flag, '-v', which causes it to also
print the help text of each matching result.
Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
---
This works a bit differently from [gmnq]conf in that it accepts (and
requires) arguments, but I couldn't see an easy/obvious way of passing
command-line args through the makefile infrastructure that invokes
those, so the wrapper script passes things to it via environment
variables instead. Suggestions welcome if there's a nicer way of
achieving that.
scripts/findconf | 22 ++++++++++++
scripts/kconfig/.gitignore | 1 +
scripts/kconfig/Makefile | 7 +++-
scripts/kconfig/findconf.c | 74 ++++++++++++++++++++++++++++++++++++++
scripts/kconfig/lkc.h | 1 +
scripts/kconfig/menu.c | 2 +-
6 files changed, 105 insertions(+), 2 deletions(-)
create mode 100755 scripts/findconf
create mode 100644 scripts/kconfig/findconf.c
diff --git a/scripts/findconf b/scripts/findconf
new file mode 100755
index 000000000000..c59132548082
--- /dev/null
+++ b/scripts/findconf
@@ -0,0 +1,22 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Find Kconfig symbols matching one or more regexen. Pass '-v' to
+# also show help text.
+
+if [ "$1" = "-v" ]; then
+ export FINDCONF_SHOW_HELP=1
+ shift
+fi
+
+if [ $# = 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
+ echo >&$(($# ? 1 : 2)) "Usage: $(basename $0) [-v] REGEX [REGEX ...]"
+ exit $((!$#))
+fi
+
+n=0
+for q in "$@"; do
+ export FINDCONF_QUERY_$((n++))="$q"
+done
+
+exec make findconfig
diff --git a/scripts/kconfig/.gitignore b/scripts/kconfig/.gitignore
index 500e7424b3ef..a3ea0600c731 100644
--- a/scripts/kconfig/.gitignore
+++ b/scripts/kconfig/.gitignore
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
/conf
+/findconf
/[gmnq]conf
/[gmnq]conf-cfg
/qconf-moc.cc
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index b8ef0fb4bbef..99e48b2d8563 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -35,6 +35,7 @@ menuconfig-prog := mconf
nconfig-prog := nconf
gconfig-prog := gconf
xconfig-prog := qconf
+findconfig-prog := findconf
define config_rule
PHONY += $(1)
@@ -45,7 +46,7 @@ PHONY += build_$(1)
build_$(1): $(obj)/$($(1)-prog)
endef
-$(foreach c, config menuconfig nconfig gconfig xconfig, $(eval $(call config_rule,$(c))))
+$(foreach c, config menuconfig nconfig gconfig xconfig findconfig, $(eval $(call config_rule,$(c))))
PHONY += localmodconfig localyesconfig
localyesconfig localmodconfig: $(obj)/conf
@@ -155,6 +156,10 @@ HOSTCFLAGS_parser.tab.o := -I $(srctree)/$(src)
hostprogs += conf
conf-objs := conf.o $(common-objs)
+# findconf: standalone non-interactive config-symbol search
+hostprogs += findconf
+findconf-objs := findconf.o $(common-objs)
+
# nconf: Used for the nconfig target based on ncurses
hostprogs += nconf
nconf-objs := nconf.o nconf.gui.o $(common-objs)
diff --git a/scripts/kconfig/findconf.c b/scripts/kconfig/findconf.c
new file mode 100644
index 000000000000..786408c97eab
--- /dev/null
+++ b/scripts/kconfig/findconf.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 Zev Weiss <zev@...ilderbeest.net>
+ *
+ * Kconfig symbol search a la carte.
+ */
+#include "lkc.h"
+
+static bool query(const char *q)
+{
+ unsigned int i;
+ const char *help;
+ struct gstr res;
+ struct symbol **sym_arr, *sym;
+ struct property *prop;
+
+ sym_arr = sym_re_search(q);
+
+ if (!sym_arr) {
+ printf("%s: no matches found.\n", q);
+ return false;
+ }
+
+ for (i = 0; sym_arr[i]; i++) {
+ sym = sym_arr[i];
+ res = str_new();
+ get_symbol_str(&res, sym, NULL);
+ printf("%s", str_get(&res));
+ str_free(&res);
+
+ if (getenv("FINDCONF_SHOW_HELP")) {
+ for_all_properties(sym, prop, P_SYMBOL) {
+ if (prop->menu) {
+ help = menu_get_help(prop->menu);
+ if (help && *help)
+ printf("%s\n", help);
+ }
+ }
+ }
+ }
+
+ free(sym_arr);
+
+ return true;
+}
+
+int main(int argc, char **argv)
+{
+ unsigned int i = 0;
+ char qvar[32];
+ bool found = false;
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: %s KCONFIG\n", argv[0]);
+ exit(1);
+ }
+
+ conf_parse(argv[1]);
+ conf_read(NULL);
+
+ for (;;) {
+ snprintf(qvar, sizeof(qvar), "FINDCONF_QUERY_%u", i++);
+ if (!getenv(qvar))
+ break;
+ found = query(getenv(qvar)) || found;
+ }
+
+ if (i == 1) {
+ fprintf(stderr, "FINDCONF_QUERY_0 not set\n");
+ return 1;
+ }
+
+ return !found;
+}
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index fa8c010aa683..b4730f580dee 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -102,6 +102,7 @@ struct menu *menu_get_root_menu(struct menu *menu);
struct menu *menu_get_parent_menu(struct menu *menu);
bool menu_has_help(struct menu *menu);
const char *menu_get_help(struct menu *menu);
+void get_symbol_str(struct gstr *r, struct symbol *sym, struct list_head *head);
struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head);
void menu_get_ext_help(struct menu *menu, struct gstr *help);
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 3d6f7cba8846..4b990c73e431 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -800,7 +800,7 @@ static void get_symbol_props_str(struct gstr *r, struct symbol *sym,
/*
* head is optional and may be NULL
*/
-static void get_symbol_str(struct gstr *r, struct symbol *sym,
+void get_symbol_str(struct gstr *r, struct symbol *sym,
struct list_head *head)
{
struct property *prop;
--
2.36.1
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