[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini touch implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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[3232] | 10 | /* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */
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[821] | 11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */
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| 12 |
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| 13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 14 | *
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| 15 | * Previous version called open() and then utime(). While this will be
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| 16 | * be necessary to implement -r and -t, it currently only makes things bigger.
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| 17 | * Also, exiting on a failure was a bug. All args should be processed.
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| 18 | */
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| 19 |
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[1765] | 20 | #include "libbb.h"
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[821] | 21 |
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[3232] | 22 | //config:config TOUCH
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| 23 | //config: bool "touch"
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| 24 | //config: default y
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| 25 | //config: help
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| 26 | //config: touch is used to create or change the access and/or
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| 27 | //config: modification timestamp of specified files.
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| 28 | //config:
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[3621] | 29 | //config:config FEATURE_TOUCH_NODEREF
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| 30 | //config: bool "Add support for -h"
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| 31 | //config: default y
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| 32 | //config: depends on TOUCH
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| 33 | //config: help
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| 34 | //config: Enable touch to have the -h option.
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| 35 | //config: This requires libc support for lutimes() function.
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| 36 | //config:
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[3232] | 37 | //config:config FEATURE_TOUCH_SUSV3
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| 38 | //config: bool "Add support for SUSV3 features (-d -t -r)"
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| 39 | //config: default y
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| 40 | //config: depends on TOUCH
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| 41 | //config: help
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| 42 | //config: Enable touch to use a reference file or a given date/time argument.
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| 43 |
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| 44 | //applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
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| 45 |
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| 46 | //kbuild:lib-$(CONFIG_TOUCH) += touch.o
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| 47 |
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| 48 | //usage:#define touch_trivial_usage
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| 49 | //usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..."
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| 50 | //usage:#define touch_full_usage "\n\n"
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| 51 | //usage: "Update the last-modified date on the given FILE[s]\n"
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| 52 | //usage: "\n -c Don't create files"
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[3621] | 53 | //usage: IF_FEATURE_TOUCH_NODEREF(
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| 54 | //usage: "\n -h Don't follow links"
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| 55 | //usage: )
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[3232] | 56 | //usage: IF_FEATURE_TOUCH_SUSV3(
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| 57 | //usage: "\n -d DT Date/time to use"
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| 58 | //usage: "\n -t DT Date/time to use"
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| 59 | //usage: "\n -r FILE Use FILE's date/time"
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| 60 | //usage: )
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| 61 | //usage:
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| 62 | //usage:#define touch_example_usage
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| 63 | //usage: "$ ls -l /tmp/foo\n"
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| 64 | //usage: "/bin/ls: /tmp/foo: No such file or directory\n"
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| 65 | //usage: "$ touch /tmp/foo\n"
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| 66 | //usage: "$ ls -l /tmp/foo\n"
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| 67 | //usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
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| 68 |
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[1765] | 69 | /* This is a NOFORK applet. Be very careful! */
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| 70 |
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[2725] | 71 | /* coreutils implements:
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| 72 | * -a change only the access time
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| 73 | * -c, --no-create
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| 74 | * do not create any files
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| 75 | * -d, --date=STRING
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| 76 | * parse STRING and use it instead of current time
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| 77 | * -f (ignored, BSD compat)
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| 78 | * -m change only the modification time
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[3621] | 79 | * -h, --no-dereference
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[2725] | 80 | * -r, --reference=FILE
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| 81 | * use this file's times instead of current time
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| 82 | * -t STAMP
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| 83 | * use [[CC]YY]MMDDhhmm[.ss] instead of current time
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| 84 | * --time=WORD
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| 85 | * change the specified time: WORD is access, atime, or use
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| 86 | */
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| 87 |
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| 88 | int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 89 | int touch_main(int argc UNUSED_PARAM, char **argv)
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[821] | 90 | {
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| 91 | int fd;
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| 92 | int status = EXIT_SUCCESS;
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[2725] | 93 | int opts;
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[3621] | 94 | enum {
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| 95 | OPT_c = (1 << 0),
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| 96 | OPT_r = (1 << 1) * ENABLE_FEATURE_TOUCH_SUSV3,
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| 97 | OPT_d = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3,
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| 98 | OPT_t = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3,
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| 99 | OPT_h = (1 << 4) * ENABLE_FEATURE_TOUCH_NODEREF,
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| 100 | };
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[3232] | 101 | #if ENABLE_FEATURE_TOUCH_SUSV3
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[2725] | 102 | # if ENABLE_LONG_OPTS
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| 103 | static const char touch_longopts[] ALIGN1 =
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| 104 | /* name, has_arg, val */
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| 105 | "no-create\0" No_argument "c"
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| 106 | "reference\0" Required_argument "r"
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| 107 | "date\0" Required_argument "d"
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[3621] | 108 | IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h")
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[2725] | 109 | ;
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| 110 | # endif
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| 111 | char *reference_file = NULL;
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| 112 | char *date_str = NULL;
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| 113 | struct timeval timebuf[2];
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| 114 | timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
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| 115 | #else
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| 116 | # define reference_file NULL
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| 117 | # define date_str NULL
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| 118 | # define timebuf ((struct timeval*)NULL)
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| 119 | #endif
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[821] | 120 |
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[3232] | 121 | #if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS
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[2725] | 122 | applet_long_options = touch_longopts;
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| 123 | #endif
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| 124 | /* -d and -t both set time. In coreutils,
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| 125 | * accepted data format differs a bit between -d and -t.
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| 126 | * We accept the same formats for both */
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[3232] | 127 | opts = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:")
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[3621] | 128 | IF_FEATURE_TOUCH_NODEREF("h")
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[2725] | 129 | /*ignored:*/ "fma"
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[3232] | 130 | IF_FEATURE_TOUCH_SUSV3(, &reference_file)
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| 131 | IF_FEATURE_TOUCH_SUSV3(, &date_str)
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| 132 | IF_FEATURE_TOUCH_SUSV3(, &date_str)
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[2725] | 133 | );
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| 134 |
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[821] | 135 | argv += optind;
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| 136 | if (!*argv) {
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| 137 | bb_show_usage();
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| 138 | }
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| 139 |
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[2725] | 140 | if (reference_file) {
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| 141 | struct stat stbuf;
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| 142 | xstat(reference_file, &stbuf);
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| 143 | timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
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[3621] | 144 | /* Can use .st_mtim.tv_nsec
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| 145 | * (or is it .st_mtimensec?? see date.c)
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| 146 | * to set microseconds too.
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| 147 | */
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[2725] | 148 | }
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| 149 |
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| 150 | if (date_str) {
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| 151 | struct tm tm_time;
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| 152 | time_t t;
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| 153 |
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[3232] | 154 | //memset(&tm_time, 0, sizeof(tm_time));
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| 155 | /* Better than memset: makes "HH:MM" dates meaningful */
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| 156 | time(&t);
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| 157 | localtime_r(&t, &tm_time);
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[2725] | 158 | parse_datestr(date_str, &tm_time);
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| 159 |
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| 160 | /* Correct any day of week and day of year etc. fields */
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| 161 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */
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| 162 | t = validate_tm_time(date_str, &tm_time);
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| 163 |
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| 164 | timebuf[1].tv_sec = timebuf[0].tv_sec = t;
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| 165 | }
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| 166 |
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[821] | 167 | do {
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[3621] | 168 | int result;
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| 169 | result = (
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| 170 | #if ENABLE_FEATURE_TOUCH_NODEREF
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| 171 | (opts & OPT_h) ? lutimes :
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| 172 | #endif
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| 173 | utimes)(*argv, (reference_file || date_str) ? timebuf : NULL);
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| 174 | if (result != 0) {
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| 175 | if (errno == ENOENT) { /* no such file? */
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| 176 | if (opts & OPT_c) {
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| 177 | /* Creation is disabled, so ignore */
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[821] | 178 | continue;
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| 179 | }
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[2725] | 180 | /* Try to create the file */
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| 181 | fd = open(*argv, O_RDWR | O_CREAT, 0666);
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| 182 | if (fd >= 0) {
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| 183 | xclose(fd);
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| 184 | if (reference_file || date_str)
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| 185 | utimes(*argv, timebuf);
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[821] | 186 | continue;
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| 187 | }
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| 188 | }
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| 189 | status = EXIT_FAILURE;
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[2725] | 190 | bb_simple_perror_msg(*argv);
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[821] | 191 | }
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| 192 | } while (*++argv);
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| 193 |
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| 194 | return status;
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| 195 | }
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