tools: bootconfig: Add bootconfig command

Add "bootconfig" command which operates the bootconfig
config-data on initrd image.

User can add/delete/verify the boot config on initrd
image using this command.

e.g.
Add a boot config to initrd image
 # bootconfig -a myboot.conf /boot/initrd.img

Remove it.
 # bootconfig -d /boot/initrd.img

Or verify (and show) it.
 # bootconfig /boot/initrd.img

Link: http://lkml.kernel.org/r/157867223582.17873.14342161849213219982.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[ Removed extra blank line at end of bootconfig.c ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

MAINTAINERS

@@ -15775,6 +15775,7 @@ M:	Masami Hiramatsu <mhiramat@kernel.org>
 S:	Maintained
 F:	lib/bootconfig.c
 F:	include/linux/bootconfig.h
+F:	tools/bootconfig/*
 
 SUN3/3X
 M:	Sam Creasey <sammy@sammy.net>

tools/Makefile

@@ -28,6 +28,7 @@ help:
 	@echo '  pci                    - PCI tools'
 	@echo '  perf                   - Linux performance measurement and analysis tool'
 	@echo '  selftests              - various kernel selftests'
+	@echo '  bootconfig             - boot config tool'
 	@echo '  spi                    - spi tools'
 	@echo '  tmon                   - thermal monitoring and tuning tool'
 	@echo '  turbostat              - Intel CPU idle stats and freq reporting tool'
@@ -63,7 +64,7 @@ acpi: FORCE
 cpupower: FORCE
 	$(call descend,power/$@)
 
-cgroup firewire hv guest spi usb virtio vm bpf iio gpio objtool leds wmi pci firmware debugging: FORCE
+cgroup firewire hv guest bootconfig spi usb virtio vm bpf iio gpio objtool leds wmi pci firmware debugging: FORCE
 	$(call descend,$@)
 
 liblockdep: FORCE
@@ -96,7 +97,7 @@ kvm_stat: FORCE
 	$(call descend,kvm/$@)
 
 all: acpi cgroup cpupower gpio hv firewire liblockdep \
-		perf selftests spi turbostat usb \
+		perf selftests bootconfig spi turbostat usb \
 		virtio vm bpf x86_energy_perf_policy \
 		tmon freefall iio objtool kvm_stat wmi \
 		pci debugging
@@ -107,7 +108,7 @@ acpi_install:
 cpupower_install:
 	$(call descend,power/$(@:_install=),install)
 
-cgroup_install firewire_install gpio_install hv_install iio_install perf_install spi_install usb_install virtio_install vm_install bpf_install objtool_install wmi_install pci_install debugging_install:
+cgroup_install firewire_install gpio_install hv_install iio_install perf_install bootconfig_install spi_install usb_install virtio_install vm_install bpf_install objtool_install wmi_install pci_install debugging_install:
 	$(call descend,$(@:_install=),install)
 
 liblockdep_install:
@@ -141,7 +142,7 @@ acpi_clean:
 cpupower_clean:
 	$(call descend,power/cpupower,clean)
 
-cgroup_clean hv_clean firewire_clean spi_clean usb_clean virtio_clean vm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean pci_clean firmware_clean debugging_clean:
+cgroup_clean hv_clean firewire_clean bootconfig_clean spi_clean usb_clean virtio_clean vm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean pci_clean firmware_clean debugging_clean:
 	$(call descend,$(@:_clean=),clean)
 
 liblockdep_clean:
@@ -176,7 +177,7 @@ build_clean:
 	$(call descend,build,clean)
 
 clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean \
-		perf_clean selftests_clean turbostat_clean spi_clean usb_clean virtio_clean \
+		perf_clean selftests_clean turbostat_clean bootconfig_clean spi_clean usb_clean virtio_clean \
 		vm_clean bpf_clean iio_clean x86_energy_perf_policy_clean tmon_clean \
 		freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean \
 		gpio_clean objtool_clean leds_clean wmi_clean pci_clean firmware_clean debugging_clean \

tools/bootconfig/.gitignore

@@ -0,0 +1 @@
+bootconfig

tools/bootconfig/Makefile

@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for bootconfig command
+
+bindir ?= /usr/bin
+
+HEADER = include/linux/bootconfig.h
+CFLAGS = -Wall -g -I./include
+
+PROGS = bootconfig
+
+all: $(PROGS)
+
+bootconfig: ../../lib/bootconfig.c main.c $(HEADER)
+	$(CC) $(filter %.c,$^) $(CFLAGS) -o $@
+
+install: $(PROGS)
+	install bootconfig $(DESTDIR)$(bindir)
+
+clean:
+	$(RM) -f *.o bootconfig

tools/bootconfig/include/linux/bootconfig.h

@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BOOTCONFIG_LINUX_BOOTCONFIG_H
+#define _BOOTCONFIG_LINUX_BOOTCONFIG_H
+
+#include "../../../../include/linux/bootconfig.h"
+
+#endif

tools/bootconfig/include/linux/bug.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SKC_LINUX_BUG_H
+#define _SKC_LINUX_BUG_H
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define WARN_ON(cond)	\
+	((cond) ? printf("Internal warning(%s:%d, %s): %s\n",	\
+			__FILE__, __LINE__, __func__, #cond) : 0)
+
+#endif

tools/bootconfig/include/linux/ctype.h

@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SKC_LINUX_CTYPE_H
+#define _SKC_LINUX_CTYPE_H
+
+#include <ctype.h>
+
+#endif

tools/bootconfig/include/linux/errno.h

@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SKC_LINUX_ERRNO_H
+#define _SKC_LINUX_ERRNO_H
+
+#include <asm/errno.h>
+
+#endif

tools/bootconfig/include/linux/kernel.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SKC_LINUX_KERNEL_H
+#define _SKC_LINUX_KERNEL_H
+
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include <linux/printk.h>
+
+typedef unsigned short u16;
+typedef unsigned int   u32;
+
+#define unlikely(cond)	(cond)
+
+#define __init
+#define __initdata
+
+#endif

tools/bootconfig/include/linux/printk.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SKC_LINUX_PRINTK_H
+#define _SKC_LINUX_PRINTK_H
+
+#include <stdio.h>
+
+/* controllable printf */
+extern int pr_output;
+#define printk(fmt, ...)	\
+	(pr_output ? printf(fmt, __VA_ARGS__) : 0)
+
+#define pr_err printk
+#define pr_warn	printk
+#define pr_info	printk
+#define pr_debug printk
+
+#endif

tools/bootconfig/include/linux/string.h

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SKC_LINUX_STRING_H
+#define _SKC_LINUX_STRING_H
+
+#include <string.h>
+
+/* Copied from lib/string.c */
+static inline char *skip_spaces(const char *str)
+{
+	while (isspace(*str))
+		++str;
+	return (char *)str;
+}
+
+static inline char *strim(char *s)
+{
+	size_t size;
+	char *end;
+
+	size = strlen(s);
+	if (!size)
+		return s;
+
+	end = s + size - 1;
+	while (end >= s && isspace(*end))
+		end--;
+	*(end + 1) = '\0';
+
+	return skip_spaces(s);
+}
+
+#endif