statinfo.c

   1 #include "git-compat-util.h"
   2 #include "environment.h"
   3 #include "statinfo.h"
   4
   5 void fill_stat_data(struct stat_data *sd, struct stat *st)
   6 {
   7         sd->sd_ctime.sec = (unsigned int)st->st_ctime;
   8         sd->sd_mtime.sec = (unsigned int)st->st_mtime;
   9         sd->sd_ctime.nsec = ST_CTIME_NSEC(*st);
  10         sd->sd_mtime.nsec = ST_MTIME_NSEC(*st);
  11         sd->sd_dev = st->st_dev;
  12         sd->sd_ino = st->st_ino;
  13         sd->sd_uid = st->st_uid;
  14         sd->sd_gid = st->st_gid;
  15         sd->sd_size = st->st_size;
  16 }
  17
  18 int match_stat_data(const struct stat_data *sd, struct stat *st)
  19 {
  20         int changed = 0;
  21
  22         if (sd->sd_mtime.sec != (unsigned int)st->st_mtime)
  23                 changed |= MTIME_CHANGED;
  24         if (trust_ctime && check_stat &&
  25             sd->sd_ctime.sec != (unsigned int)st->st_ctime)
  26                 changed |= CTIME_CHANGED;
  27
  28 #ifdef USE_NSEC
  29         if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st))
  30                 changed |= MTIME_CHANGED;
  31         if (trust_ctime && check_stat &&
  32             sd->sd_ctime.nsec != ST_CTIME_NSEC(*st))
  33                 changed |= CTIME_CHANGED;
  34 #endif
  35
  36         if (check_stat) {
  37                 if (sd->sd_uid != (unsigned int) st->st_uid ||
  38                         sd->sd_gid != (unsigned int) st->st_gid)
  39                         changed |= OWNER_CHANGED;
  40                 if (sd->sd_ino != (unsigned int) st->st_ino)
  41                         changed |= INODE_CHANGED;
  42         }
  43
  44 #ifdef USE_STDEV
  45         /*
  46          * st_dev breaks on network filesystems where different
  47          * clients will have different views of what "device"
  48          * the filesystem is on
  49          */
  50         if (check_stat && sd->sd_dev != (unsigned int) st->st_dev)
  51                         changed |= INODE_CHANGED;
  52 #endif
  53
  54         if (sd->sd_size != (unsigned int) st->st_size)
  55                 changed |= DATA_CHANGED;
  56
  57         return changed;
  58 }
  59
  60 void stat_validity_clear(struct stat_validity *sv)
  61 {
  62         FREE_AND_NULL(sv->sd);
  63 }
  64
  65 int stat_validity_check(struct stat_validity *sv, const char *path)
  66 {
  67         struct stat st;
  68
  69         if (stat(path, &st) < 0)
  70                 return sv->sd == NULL;
  71         if (!sv->sd)
  72                 return 0;
  73         return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st);
  74 }
  75
  76 void stat_validity_update(struct stat_validity *sv, int fd)
  77 {
  78         struct stat st;
  79
  80         if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode))
  81                 stat_validity_clear(sv);
  82         else {
  83                 if (!sv->sd)
  84                         CALLOC_ARRAY(sv->sd, 1);
  85                 fill_stat_data(sv->sd, &st);
  86         }
  87 }