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
parent
79747415d6
commit
ab77e81a85
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@ -691,6 +691,7 @@ source archival/Config.in
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source coreutils/Config.in
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source console-tools/Config.in
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source debianutils/Config.in
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source klibc-utils/Config.in
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source editors/Config.in
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source findutils/Config.in
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source init/Config.in
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1
Makefile
1
Makefile
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@ -470,6 +470,7 @@ libs-y := \
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coreutils/ \
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coreutils/libcoreutils/ \
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debianutils/ \
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klibc-utils/ \
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e2fsprogs/ \
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editors/ \
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findutils/ \
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10
klibc-utils/Config.src
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10
klibc-utils/Config.src
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@ -0,0 +1,10 @@
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#
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# For a description of the syntax of this configuration file,
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# see scripts/kbuild/config-language.txt.
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#
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menu "klibc-utils"
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INSERT
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endmenu
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9
klibc-utils/Kbuild.src
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9
klibc-utils/Kbuild.src
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@ -0,0 +1,9 @@
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# Makefile for busybox
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#
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# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
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#
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# Licensed under GPLv2, see file LICENSE in this source tree.
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lib-y:=
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INSERT
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12
klibc-utils/minips.c
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12
klibc-utils/minips.c
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@ -0,0 +1,12 @@
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/*
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* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config MINIPS
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//config: bool "minips (11 kb)"
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//config: default n # for god's sake, just use "ps" name in your scripts
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//config: help
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//config: Alias to "ps".
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/* applet abd kbuild hooks are in ps.c */
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46
klibc-utils/nuke.c
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46
klibc-utils/nuke.c
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@ -0,0 +1,46 @@
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/*
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* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config NUKE
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//config: bool "nuke"
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//config: default y
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//config: help
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//config: Alias to "rm -rf".
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//applet:IF_NUKE(APPLET_NOEXEC(nuke, nuke, BB_DIR_BIN, BB_SUID_DROP, nuke))
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//kbuild:lib-$(CONFIG_NUKE) += nuke.o
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//usage:#define nuke_trivial_usage
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//usage: "DIR..."
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//usage:#define nuke_full_usage "\n\n"
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//usage: "Resursively remove DIRs"
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#include "libbb.h"
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/* This is a NOEXEC applet. Be very careful! */
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int nuke_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nuke_main(int argc UNUSED_PARAM, char **argv)
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{
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// klibc-utils do not check opts, will try to delete "-dir" args
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//opt = getopt32(argv, "");
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//argv += optind;
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while (*++argv) {
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#if 0
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// klibc-utils do not check this, will happily operate on ".."
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const char *base = bb_get_last_path_component_strip(*argv);
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if (DOT_OR_DOTDOT(base)) {
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bb_error_msg("can't remove '.' or '..'");
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continue;
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}
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#endif
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remove_file(*argv, FILEUTILS_FORCE | FILEUTILS_RECUR);
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}
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// klibc-utils do not indicate errors
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return EXIT_SUCCESS;
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}
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115
klibc-utils/resume.c
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115
klibc-utils/resume.c
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@ -0,0 +1,115 @@
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/*
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* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config RESUME
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//config: bool "resume"
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//config: default y
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//config: help
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//config: Resume from saved "suspend-to-disk" image
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//applet:IF_RESUME(APPLET_NOEXEC(resume, resume, BB_DIR_BIN, BB_SUID_DROP, resume))
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//kbuild:lib-$(CONFIG_RESUME) += resume.o
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#include "libbb.h"
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/* This is a NOEXEC applet. Be very careful! */
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/* name_to_dev_t() in klibc-utils supports extended device name formats,
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* apart from the usual case where /dev/NAME already exists.
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*
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* - device number in hexadecimal represents itself (in dev_t layout).
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* - device number in major:minor decimal represents itself.
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* - if block device (or partition) with this name is found in sysfs.
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* - if /dev/ prefix is not given, it is assumed.
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*
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* klibc-utils also recognizes these, but they don't work
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* for "resume" tool purposes (thus we don't support them (yet?)):
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* - /dev/nfs
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* - /dev/ram (alias to /dev/ram0)
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* - /dev/mtd
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*/
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static dev_t name_to_dev_t(const char *devname)
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{
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char devfile[sizeof(int)*3 * 2 + 4];
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char *sysname;
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unsigned major_num, minor_num;
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struct stat st;
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int r;
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if (strncmp(devname, "/dev/", 5) != 0) {
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char *cptr;
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cptr = strchr(devname, ':');
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if (cptr) {
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/* Colon-separated decimal device number? */
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*cptr = '\0';
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major_num = bb_strtou(devname, NULL, 10);
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if (!errno)
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minor_num = bb_strtou(cptr + 1, NULL, 10);
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*cptr = ':';
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if (!errno)
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return makedev(major_num, minor_num);
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} else {
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/* Hexadecimal device number? */
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dev_t res = (dev_t) bb_strtoul(devname, NULL, 16);
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if (!errno)
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return res;
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}
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devname = xasprintf("/dev/%s", devname);
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}
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/* Now devname is always "/dev/FOO" */
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if (stat(devname, &st) == 0 && S_ISBLK(st.st_mode))
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return st.st_rdev;
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/* Full blockdevs as well as partitions may be visible
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* in /sys/class/block/ even if /dev is not populated.
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*/
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sysname = xasprintf("/sys/class/block/%s/dev", devname + 5);
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r = open_read_close(sysname, devfile, sizeof(devfile) - 1);
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//free(sysname);
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if (r > 0) {
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devfile[r] = '\0';
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if (sscanf(devfile, "%u:%u", &major_num, &minor_num) == 2) {
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return makedev(major_num, minor_num);
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}
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}
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return (dev_t) 0;
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}
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//usage:#define resume_trivial_usage
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//usage: "BLOCKDEV [OFFSET]"
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//usage:#define resume_full_usage "\n"
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//usage: "\n""Restore system state from 'suspend-to-disk' data in BLOCKDEV"
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int resume_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int resume_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned long long ofs;
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dev_t resume_device;
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char *s;
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int fd;
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argv++;
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if (!argv[0])
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bb_show_usage();
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resume_device = name_to_dev_t(argv[0]);
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if (major(resume_device) == 0) {
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bb_error_msg_and_die("invalid resume device: %s", argv[0]);
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}
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ofs = (argv[1] ? xstrtoull(argv[1], 0) : 0);
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fd = xopen("/sys/power/resume", O_WRONLY);
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s = xasprintf("%u:%u:%llu", major(resume_device), minor(resume_device), ofs);
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xwrite_str(fd, s);
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/* if write() returns, resume did not succeed */
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return EXIT_FAILURE; /* klibc-utils exits -1 aka 255 */
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}
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@ -50,9 +50,12 @@
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//config: Include support for measuring HZ on old kernels and non-ELF systems
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//config: (if you are on Linux 2.4.0+ and use ELF, you don't need this)
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//applet:IF_PS(APPLET_NOEXEC(ps, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
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// APPLET_NOEXEC:name main location suid_type help
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//applet:IF_PS( APPLET_NOEXEC(ps, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
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//applet:IF_MINIPS(APPLET_NOEXEC(minips, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
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//kbuild:lib-$(CONFIG_PS) += ps.o
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//kbuild:lib-$(CONFIG_MINIPS) += ps.o
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//usage:#if ENABLE_DESKTOP
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//usage:
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@ -115,6 +115,9 @@ lib-y:=
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include debianutils/Kbuild
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lib-all-y += $(patsubst %,debianutils/%,$(sort $(lib-y)))
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lib-y:=
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include klibc-utils/Kbuild
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lib-all-y += $(patsubst %,klibc-utils/%,$(sort $(lib-y)))
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lib-y:=
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include runit/Kbuild
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lib-all-y += $(patsubst %,runit/%,$(sort $(lib-y)))
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lib-y:=
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