Andrew's git - gitweb.git/blob

   1/*
   2 * This program can either change modification time of the given
   3 * file(s) or just print it. The program does not change atime nor
   4 * ctime (their values are explicitly preserved).
   5 *
   6 * The mtime can be changed to an absolute value:
   7 *
   8 *      test-chmtime =<seconds> file...
   9 *
  10 * Relative to the current time as returned by time(3):
  11 *
  12 *      test-chmtime =+<seconds> (or =-<seconds>) file...
  13 *
  14 * Or relative to the current mtime of the file:
  15 *
  16 *      test-chmtime <seconds> file...
  17 *      test-chmtime +<seconds> (or -<seconds>) file...
  18 *
  19 * Examples:
  20 *
  21 * To just print the mtime use --verbose and set the file mtime offset to 0:
  22 *
  23 *      test-chmtime -v +0 file
  24 *
  25 * To set the mtime to current time:
  26 *
  27 *      test-chmtime =+0 file
  28 *
  29 */
  30#include "git-compat-util.h"
  31#include <utime.h>
  32
  33static const char usage_str[] = "-v|--verbose (+|=|=+|=-|-)<seconds> <file>...";
  34
  35static int timespec_arg(const char *arg, long int *set_time, int *set_eq)
  36{
  37        char *test;
  38        const char *timespec = arg;
  39        *set_eq = (*timespec == '=') ? 1 : 0;
  40        if (*set_eq) {
  41                timespec++;
  42                if (*timespec == '+') {
  43                        *set_eq = 2; /* relative "in the future" */
  44                        timespec++;
  45                }
  46        }
  47        *set_time = strtol(timespec, &test, 10);
  48        if (*test) {
  49                fprintf(stderr, "Not a base-10 integer: %s\n", arg + 1);
  50                return 0;
  51        }
  52        if ((*set_eq && *set_time < 0) || *set_eq == 2) {
  53                time_t now = time(NULL);
  54                *set_time += now;
  55        }
  56        return 1;
  57}
  58
  59int main(int argc, const char *argv[])
  60{
  61        static int verbose;
  62
  63        int i = 1;
  64        /* no mtime change by default */
  65        int set_eq = 0;
  66        long int set_time = 0;
  67
  68        if (argc < 3)
  69                goto usage;
  70
  71        if (strcmp(argv[i], "--verbose") == 0 || strcmp(argv[i], "-v") == 0) {
  72                verbose = 1;
  73                ++i;
  74        }
  75        if (timespec_arg(argv[i], &set_time, &set_eq))
  76                ++i;
  77        else
  78                goto usage;
  79
  80        for (; i < argc; i++) {
  81                struct stat sb;
  82                struct utimbuf utb;
  83
  84                if (stat(argv[i], &sb) < 0) {
  85                        fprintf(stderr, "Failed to stat %s: %s\n",
  86                                argv[i], strerror(errno));
  87                        return -1;
  88                }
  89
  90#ifdef WIN32
  91                if (!(sb.st_mode & S_IWUSR) &&
  92                                chmod(argv[i], sb.st_mode | S_IWUSR)) {
  93                        fprintf(stderr, "Could not make user-writable %s: %s",
  94                                argv[i], strerror(errno));
  95                        return -1;
  96                }
  97#endif
  98
  99                utb.actime = sb.st_atime;
 100                utb.modtime = set_eq ? set_time : sb.st_mtime + set_time;
 101
 102                if (verbose) {
 103                        uintmax_t mtime = utb.modtime < 0 ? 0: utb.modtime;
 104                        printf("%"PRIuMAX"\t%s\n", mtime, argv[i]);
 105                }
 106
 107                if (utb.modtime != sb.st_mtime && utime(argv[i], &utb) < 0) {
 108                        fprintf(stderr, "Failed to modify time on %s: %s\n",
 109                                argv[i], strerror(errno));
 110                        return -1;
 111                }
 112        }
 113
 114        return 0;
 115
 116usage:
 117        fprintf(stderr, "usage: %s %s\n", argv[0], usage_str);
 118        return -1;
 119}