klibc-utils: new applets: resume, nuke, minips

minips is a pure alias to ps, just in case someone needs 100% klibc-utils compat.
nuke is a primitive version of "rm -rf" without options and error checks. ~30 bytes.

resume is a tool for initramfs which resumes from a given block device.

function                                             old     new   delta
resume_main                                            -     582    +582
packed_usage                                       31640   31712     +72
nuke_main                                              -      28     +28
xstrtoull                                              -      24     +24
applet_names                                        2646    2665     +19
applet_main                                         1532    1544     +12
applet_suid                                           96      97      +1
applet_install_loc                                   192     193      +1
applet_flags                                          96      97      +1
------------------------------------------------------------------------------
(add/remove: 5/0 grow/shrink: 6/0 up/down: 740/0)             Total: 740 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-08-18 19:15:29 +02:00
parent 79747415d6
commit ab77e81a85
9 changed files with 201 additions and 1 deletions

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@ -691,6 +691,7 @@ source archival/Config.in
source coreutils/Config.in
source console-tools/Config.in
source debianutils/Config.in
source klibc-utils/Config.in
source editors/Config.in
source findutils/Config.in
source init/Config.in

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@ -470,6 +470,7 @@ libs-y := \
coreutils/ \
coreutils/libcoreutils/ \
debianutils/ \
klibc-utils/ \
e2fsprogs/ \
editors/ \
findutils/ \

10
klibc-utils/Config.src Normal file
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@ -0,0 +1,10 @@
#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#
menu "klibc-utils"
INSERT
endmenu

9
klibc-utils/Kbuild.src Normal file
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@ -0,0 +1,9 @@
# Makefile for busybox
#
# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
#
# Licensed under GPLv2, see file LICENSE in this source tree.
lib-y:=
INSERT

12
klibc-utils/minips.c Normal file
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@ -0,0 +1,12 @@
/*
* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config MINIPS
//config: bool "minips (11 kb)"
//config: default n # for god's sake, just use "ps" name in your scripts
//config: help
//config: Alias to "ps".
/* applet abd kbuild hooks are in ps.c */

46
klibc-utils/nuke.c Normal file
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@ -0,0 +1,46 @@
/*
* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config NUKE
//config: bool "nuke"
//config: default y
//config: help
//config: Alias to "rm -rf".
//applet:IF_NUKE(APPLET_NOEXEC(nuke, nuke, BB_DIR_BIN, BB_SUID_DROP, nuke))
//kbuild:lib-$(CONFIG_NUKE) += nuke.o
//usage:#define nuke_trivial_usage
//usage: "DIR..."
//usage:#define nuke_full_usage "\n\n"
//usage: "Resursively remove DIRs"
#include "libbb.h"
/* This is a NOEXEC applet. Be very careful! */
int nuke_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nuke_main(int argc UNUSED_PARAM, char **argv)
{
// klibc-utils do not check opts, will try to delete "-dir" args
//opt = getopt32(argv, "");
//argv += optind;
while (*++argv) {
#if 0
// klibc-utils do not check this, will happily operate on ".."
const char *base = bb_get_last_path_component_strip(*argv);
if (DOT_OR_DOTDOT(base)) {
bb_error_msg("can't remove '.' or '..'");
continue;
}
#endif
remove_file(*argv, FILEUTILS_FORCE | FILEUTILS_RECUR);
}
// klibc-utils do not indicate errors
return EXIT_SUCCESS;
}

115
klibc-utils/resume.c Normal file
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@ -0,0 +1,115 @@
/*
* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config RESUME
//config: bool "resume"
//config: default y
//config: help
//config: Resume from saved "suspend-to-disk" image
//applet:IF_RESUME(APPLET_NOEXEC(resume, resume, BB_DIR_BIN, BB_SUID_DROP, resume))
//kbuild:lib-$(CONFIG_RESUME) += resume.o
#include "libbb.h"
/* This is a NOEXEC applet. Be very careful! */
/* name_to_dev_t() in klibc-utils supports extended device name formats,
* apart from the usual case where /dev/NAME already exists.
*
* - device number in hexadecimal represents itself (in dev_t layout).
* - device number in major:minor decimal represents itself.
* - if block device (or partition) with this name is found in sysfs.
* - if /dev/ prefix is not given, it is assumed.
*
* klibc-utils also recognizes these, but they don't work
* for "resume" tool purposes (thus we don't support them (yet?)):
* - /dev/nfs
* - /dev/ram (alias to /dev/ram0)
* - /dev/mtd
*/
static dev_t name_to_dev_t(const char *devname)
{
char devfile[sizeof(int)*3 * 2 + 4];
char *sysname;
unsigned major_num, minor_num;
struct stat st;
int r;
if (strncmp(devname, "/dev/", 5) != 0) {
char *cptr;
cptr = strchr(devname, ':');
if (cptr) {
/* Colon-separated decimal device number? */
*cptr = '\0';
major_num = bb_strtou(devname, NULL, 10);
if (!errno)
minor_num = bb_strtou(cptr + 1, NULL, 10);
*cptr = ':';
if (!errno)
return makedev(major_num, minor_num);
} else {
/* Hexadecimal device number? */
dev_t res = (dev_t) bb_strtoul(devname, NULL, 16);
if (!errno)
return res;
}
devname = xasprintf("/dev/%s", devname);
}
/* Now devname is always "/dev/FOO" */
if (stat(devname, &st) == 0 && S_ISBLK(st.st_mode))
return st.st_rdev;
/* Full blockdevs as well as partitions may be visible
* in /sys/class/block/ even if /dev is not populated.
*/
sysname = xasprintf("/sys/class/block/%s/dev", devname + 5);
r = open_read_close(sysname, devfile, sizeof(devfile) - 1);
//free(sysname);
if (r > 0) {
devfile[r] = '\0';
if (sscanf(devfile, "%u:%u", &major_num, &minor_num) == 2) {
return makedev(major_num, minor_num);
}
}
return (dev_t) 0;
}
//usage:#define resume_trivial_usage
//usage: "BLOCKDEV [OFFSET]"
//usage:#define resume_full_usage "\n"
//usage: "\n""Restore system state from 'suspend-to-disk' data in BLOCKDEV"
int resume_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int resume_main(int argc UNUSED_PARAM, char **argv)
{
unsigned long long ofs;
dev_t resume_device;
char *s;
int fd;
argv++;
if (!argv[0])
bb_show_usage();
resume_device = name_to_dev_t(argv[0]);
if (major(resume_device) == 0) {
bb_error_msg_and_die("invalid resume device: %s", argv[0]);
}
ofs = (argv[1] ? xstrtoull(argv[1], 0) : 0);
fd = xopen("/sys/power/resume", O_WRONLY);
s = xasprintf("%u:%u:%llu", major(resume_device), minor(resume_device), ofs);
xwrite_str(fd, s);
/* if write() returns, resume did not succeed */
return EXIT_FAILURE; /* klibc-utils exits -1 aka 255 */
}

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@ -50,9 +50,12 @@
//config: Include support for measuring HZ on old kernels and non-ELF systems
//config: (if you are on Linux 2.4.0+ and use ELF, you don't need this)
// APPLET_NOEXEC:name main location suid_type help
//applet:IF_PS( APPLET_NOEXEC(ps, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
//applet:IF_MINIPS(APPLET_NOEXEC(minips, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
//kbuild:lib-$(CONFIG_PS) += ps.o
//kbuild:lib-$(CONFIG_MINIPS) += ps.o
//usage:#if ENABLE_DESKTOP
//usage:

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@ -115,6 +115,9 @@ lib-y:=
include debianutils/Kbuild
lib-all-y += $(patsubst %,debianutils/%,$(sort $(lib-y)))
lib-y:=
include klibc-utils/Kbuild
lib-all-y += $(patsubst %,klibc-utils/%,$(sort $(lib-y)))
lib-y:=
include runit/Kbuild
lib-all-y += $(patsubst %,runit/%,$(sort $(lib-y)))
lib-y:=