t/helper/test-chmtime.c

   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 or
   4  * ctime (their values are explicitly preserved).
   5  *
   6  * The mtime can be changed to an absolute value:
   7  *
   8  *      test-tool chmtime =<seconds> file...
   9  *
  10  * Relative to the current time as returned by time(3):
  11  *
  12  *      test-tool chmtime =+<seconds> (or =-<seconds>) file...
  13  *
  14  * Or relative to the current mtime of the file:
  15  *
  16  *      test-tool chmtime <seconds> file...
  17  *      test-tool 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-tool chmtime -v +0 file
  24  *
  25  * To set the mtime to current time:
  26  *
  27  *      test-tool chmtime =+0 file
  28  *
  29  */
  30 #include "test-tool.h"
  31 #include "git-compat-util.h"
  32 #include <utime.h>
  33
  34 static const char usage_str[] = "-v|--verbose (+|=|=+|=-|-)<seconds> <file>...";
  35
  36 static int timespec_arg(const char *arg, long int *set_time, int *set_eq)
  37 {
  38         char *test;
  39         const char *timespec = arg;
  40         *set_eq = (*timespec == '=') ? 1 : 0;
  41         if (*set_eq) {
  42                 timespec++;
  43                 if (*timespec == '+') {
  44                         *set_eq = 2; /* relative "in the future" */
  45                         timespec++;
  46                 }
  47         }
  48         *set_time = strtol(timespec, &test, 10);
  49         if (*test) {
  50                 fprintf(stderr, "Not a base-10 integer: %s\n", arg + 1);
  51                 return 0;
  52         }
  53         if ((*set_eq && *set_time < 0) || *set_eq == 2) {
  54                 time_t now = time(NULL);
  55                 *set_time += now;
  56         }
  57         return 1;
  58 }
  59
  60 int cmd__chmtime(int argc, const char **argv)
  61 {
  62         static int verbose;
  63
  64         int i = 1;
  65         /* no mtime change by default */
  66         int set_eq = 0;
  67         long int set_time = 0;
  68
  69         if (argc < 3)
  70                 goto usage;
  71
  72         if (strcmp(argv[i], "--verbose") == 0 || strcmp(argv[i], "-v") == 0) {
  73                 verbose = 1;
  74                 ++i;
  75         }
  76         if (timespec_arg(argv[i], &set_time, &set_eq))
  77                 ++i;
  78         else
  79                 goto usage;
  80
  81         for (; i < argc; i++) {
  82                 struct stat sb;
  83                 struct utimbuf utb;
  84
  85                 if (stat(argv[i], &sb) < 0) {
  86                         fprintf(stderr, "Failed to stat %s: %s\n",
  87                                 argv[i], strerror(errno));
  88                         return 1;
  89                 }
  90
  91 #ifdef GIT_WINDOWS_NATIVE
  92                 if (!(sb.st_mode & S_IWUSR) &&
  93                                 chmod(argv[i], sb.st_mode | S_IWUSR)) {
  94                         fprintf(stderr, "Could not make user-writable %s: %s",
  95                                 argv[i], strerror(errno));
  96                         return 1;
  97                 }
  98 #endif
  99
 100                 utb.actime = sb.st_atime;
 101                 utb.modtime = set_eq ? set_time : sb.st_mtime + set_time;
 102
 103                 if (verbose) {
 104                         uintmax_t mtime = utb.modtime < 0 ? 0: utb.modtime;
 105                         printf("%"PRIuMAX"\t%s\n", mtime, argv[i]);
 106                 }
 107
 108                 if (utb.modtime != sb.st_mtime && utime(argv[i], &utb) < 0) {
 109                         fprintf(stderr, "Failed to modify time on %s: %s\n",
 110                                 argv[i], strerror(errno));
 111                         return 1;
 112                 }
 113         }
 114
 115         return 0;
 116
 117 usage:
 118         fprintf(stderr, "usage: %s %s\n", argv[0], usage_str);
 119         return 1;
 120 }