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/*
* This program can either change modification time of the given
* file(s) or just print it. The program does not change atime nor
* ctime (their values are explicitely preserved).
*
* The mtime can be changed to an absolute value:
*
* test-chmtime =<seconds> file...
*
* Relative to the current time as returned by time(3):
*
* test-chmtime =+<seconds> (or =-<seconds>) file...
*
* Or relative to the current mtime of the file:
*
* test-chmtime <seconds> file...
* test-chmtime +<seconds> (or -<seconds>) file...
*
* Examples:
*
* To just print the mtime use --verbose and set the file mtime offset to 0:
*
* test-chmtime -v +0 file
*
* To set the mtime to current time:
*
* test-chmtime =+0 file
*
*/
#include "git-compat-util.h"
#include <utime.h>
static const char usage_str[] = "-v|--verbose (+|=|=+|=-|-)<seconds> <file>...";
static int timespec_arg(const char *arg, long int *set_time, int *set_eq)
{
char *test;
const char *timespec = arg;
*set_eq = (*timespec == '=') ? 1 : 0;
if (*set_eq) {
timespec++;
if (*timespec == '+') {
*set_eq = 2; /* relative "in the future" */
timespec++;
}
}
*set_time = strtol(timespec, &test, 10);
if (*test) {
fprintf(stderr, "Not a base-10 integer: %s\n", arg + 1);
return 0;
}
if ((*set_eq && *set_time < 0) || *set_eq == 2) {
time_t now = time(NULL);
*set_time += now;
}
return 1;
}
int main(int argc, const char *argv[])
{
static int verbose;
int i = 1;
/* no mtime change by default */
int set_eq = 0;
long int set_time = 0;
if (argc < 3)
goto usage;
if (strcmp(argv[i], "--verbose") == 0 || strcmp(argv[i], "-v") == 0) {
verbose = 1;
++i;
}
if (timespec_arg(argv[i], &set_time, &set_eq))
++i;
else
goto usage;
for (; i < argc; i++) {
struct stat sb;
struct utimbuf utb;
if (stat(argv[i], &sb) < 0) {
fprintf(stderr, "Failed to stat %s: %s\n",
argv[i], strerror(errno));
return -1;
}
#ifdef WIN32
if (!(sb.st_mode & S_IWUSR) &&
chmod(argv[i], sb.st_mode | S_IWUSR)) {
fprintf(stderr, "Could not make user-writable %s: %s",
argv[i], strerror(errno));
return -1;
}
#endif
utb.actime = sb.st_atime;
utb.modtime = set_eq ? set_time : sb.st_mtime + set_time;
if (verbose) {
uintmax_t mtime = utb.modtime < 0 ? 0: utb.modtime;
printf("%"PRIuMAX"\t%s\n", mtime, argv[i]);
}
if (utb.modtime != sb.st_mtime && utime(argv[i], &utb) < 0) {
fprintf(stderr, "Failed to modify time on %s: %s\n",
argv[i], strerror(errno));
return -1;
}
}
return 0;
usage:
fprintf(stderr, "Usage: %s %s\n", argv[0], usage_str);
return -1;
}
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