blob: 293a9689078412731a7540ab7d9b7ee31bf1c0b0
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini touch implementation for busybox |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
8 | */ |
9 | |
10 | /* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */ |
11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */ |
12 | |
13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
14 | * |
15 | * Previous version called open() and then utime(). While this will be |
16 | * be necessary to implement -r and -t, it currently only makes things bigger. |
17 | * Also, exiting on a failure was a bug. All args should be processed. |
18 | */ |
19 | |
20 | #include "libbb.h" |
21 | |
22 | //config:config TOUCH |
23 | //config: bool "touch" |
24 | //config: default y |
25 | //config: help |
26 | //config: touch is used to create or change the access and/or |
27 | //config: modification timestamp of specified files. |
28 | //config: |
29 | //config:config FEATURE_TOUCH_NODEREF |
30 | //config: bool "Add support for -h" |
31 | //config: default y |
32 | //config: depends on TOUCH |
33 | //config: help |
34 | //config: Enable touch to have the -h option. |
35 | //config: This requires libc support for lutimes() function. |
36 | //config: |
37 | //config:config FEATURE_TOUCH_SUSV3 |
38 | //config: bool "Add support for SUSV3 features (-d -t -r)" |
39 | //config: default y |
40 | //config: depends on TOUCH |
41 | //config: help |
42 | //config: Enable touch to use a reference file or a given date/time argument. |
43 | |
44 | //applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch)) |
45 | |
46 | //kbuild:lib-$(CONFIG_TOUCH) += touch.o |
47 | |
48 | //usage:#define touch_trivial_usage |
49 | //usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..." |
50 | //usage:#define touch_full_usage "\n\n" |
51 | //usage: "Update the last-modified date on the given FILE[s]\n" |
52 | //usage: "\n -c Don't create files" |
53 | //usage: IF_FEATURE_TOUCH_NODEREF( |
54 | //usage: "\n -h Don't follow links" |
55 | //usage: ) |
56 | //usage: IF_FEATURE_TOUCH_SUSV3( |
57 | //usage: "\n -d DT Date/time to use" |
58 | //usage: "\n -t DT Date/time to use" |
59 | //usage: "\n -r FILE Use FILE's date/time" |
60 | //usage: ) |
61 | //usage: |
62 | //usage:#define touch_example_usage |
63 | //usage: "$ ls -l /tmp/foo\n" |
64 | //usage: "/bin/ls: /tmp/foo: No such file or directory\n" |
65 | //usage: "$ touch /tmp/foo\n" |
66 | //usage: "$ ls -l /tmp/foo\n" |
67 | //usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n" |
68 | |
69 | /* This is a NOFORK applet. Be very careful! */ |
70 | |
71 | /* coreutils implements: |
72 | * -a change only the access time |
73 | * -c, --no-create |
74 | * do not create any files |
75 | * -d, --date=STRING |
76 | * parse STRING and use it instead of current time |
77 | * -f (ignored, BSD compat) |
78 | * -m change only the modification time |
79 | * -h, --no-dereference |
80 | * -r, --reference=FILE |
81 | * use this file's times instead of current time |
82 | * -t STAMP |
83 | * use [[CC]YY]MMDDhhmm[.ss] instead of current time |
84 | * --time=WORD |
85 | * change the specified time: WORD is access, atime, or use |
86 | */ |
87 | |
88 | int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
89 | int touch_main(int argc UNUSED_PARAM, char **argv) |
90 | { |
91 | int fd; |
92 | int status = EXIT_SUCCESS; |
93 | int opts; |
94 | enum { |
95 | OPT_c = (1 << 0), |
96 | OPT_r = (1 << 1) * ENABLE_FEATURE_TOUCH_SUSV3, |
97 | OPT_d = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3, |
98 | OPT_t = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3, |
99 | OPT_h = (1 << 4) * ENABLE_FEATURE_TOUCH_NODEREF, |
100 | }; |
101 | #if ENABLE_FEATURE_TOUCH_SUSV3 |
102 | # if ENABLE_LONG_OPTS |
103 | static const char touch_longopts[] ALIGN1 = |
104 | /* name, has_arg, val */ |
105 | "no-create\0" No_argument "c" |
106 | "reference\0" Required_argument "r" |
107 | "date\0" Required_argument "d" |
108 | IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h") |
109 | ; |
110 | # endif |
111 | char *reference_file = NULL; |
112 | char *date_str = NULL; |
113 | struct timeval timebuf[2]; |
114 | timebuf[1].tv_usec = timebuf[0].tv_usec = 0; |
115 | #else |
116 | # define reference_file NULL |
117 | # define date_str NULL |
118 | # define timebuf ((struct timeval*)NULL) |
119 | #endif |
120 | |
121 | #if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS |
122 | applet_long_options = touch_longopts; |
123 | #endif |
124 | /* -d and -t both set time. In coreutils, |
125 | * accepted data format differs a bit between -d and -t. |
126 | * We accept the same formats for both */ |
127 | opts = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:") |
128 | IF_FEATURE_TOUCH_NODEREF("h") |
129 | /*ignored:*/ "fma" |
130 | IF_FEATURE_TOUCH_SUSV3(, &reference_file) |
131 | IF_FEATURE_TOUCH_SUSV3(, &date_str) |
132 | IF_FEATURE_TOUCH_SUSV3(, &date_str) |
133 | ); |
134 | |
135 | argv += optind; |
136 | if (!*argv) { |
137 | bb_show_usage(); |
138 | } |
139 | |
140 | if (reference_file) { |
141 | struct stat stbuf; |
142 | xstat(reference_file, &stbuf); |
143 | timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime; |
144 | /* Can use .st_mtim.tv_nsec |
145 | * (or is it .st_mtimensec?? see date.c) |
146 | * to set microseconds too. |
147 | */ |
148 | } |
149 | |
150 | if (date_str) { |
151 | struct tm tm_time; |
152 | time_t t; |
153 | |
154 | //memset(&tm_time, 0, sizeof(tm_time)); |
155 | /* Better than memset: makes "HH:MM" dates meaningful */ |
156 | time(&t); |
157 | localtime_r(&t, &tm_time); |
158 | parse_datestr(date_str, &tm_time); |
159 | |
160 | /* Correct any day of week and day of year etc. fields */ |
161 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */ |
162 | t = validate_tm_time(date_str, &tm_time); |
163 | |
164 | timebuf[1].tv_sec = timebuf[0].tv_sec = t; |
165 | } |
166 | |
167 | do { |
168 | int result; |
169 | result = ( |
170 | #if ENABLE_FEATURE_TOUCH_NODEREF |
171 | (opts & OPT_h) ? lutimes : |
172 | #endif |
173 | utimes)(*argv, (reference_file || date_str) ? timebuf : NULL); |
174 | if (result != 0) { |
175 | if (errno == ENOENT) { /* no such file? */ |
176 | if (opts & OPT_c) { |
177 | /* Creation is disabled, so ignore */ |
178 | continue; |
179 | } |
180 | /* Try to create the file */ |
181 | fd = open(*argv, O_RDWR | O_CREAT, 0666); |
182 | if (fd >= 0) { |
183 | xclose(fd); |
184 | if (reference_file || date_str) |
185 | utimes(*argv, timebuf); |
186 | continue; |
187 | } |
188 | } |
189 | status = EXIT_FAILURE; |
190 | bb_simple_perror_msg(*argv); |
191 | } |
192 | } while (*++argv); |
193 | |
194 | return status; |
195 | } |
196 |