| #include "git-compat-util.h" |
| #include "environment.h" |
| #include "statinfo.h" |
| |
| /* |
| * Munge st_size into an unsigned int. |
| */ |
| static unsigned int munge_st_size(off_t st_size) { |
| unsigned int sd_size = st_size; |
| |
| /* |
| * If the file is an exact multiple of 4 GiB, modify the value so it |
| * doesn't get marked as racily clean (zero). |
| */ |
| if (!sd_size && st_size) |
| return 0x80000000; |
| else |
| return sd_size; |
| } |
| |
| void fill_stat_data(struct stat_data *sd, struct stat *st) |
| { |
| sd->sd_ctime.sec = (unsigned int)st->st_ctime; |
| sd->sd_mtime.sec = (unsigned int)st->st_mtime; |
| sd->sd_ctime.nsec = ST_CTIME_NSEC(*st); |
| sd->sd_mtime.nsec = ST_MTIME_NSEC(*st); |
| sd->sd_dev = st->st_dev; |
| sd->sd_ino = st->st_ino; |
| sd->sd_uid = st->st_uid; |
| sd->sd_gid = st->st_gid; |
| sd->sd_size = munge_st_size(st->st_size); |
| } |
| |
| int match_stat_data(const struct stat_data *sd, struct stat *st) |
| { |
| int changed = 0; |
| |
| if (sd->sd_mtime.sec != (unsigned int)st->st_mtime) |
| changed |= MTIME_CHANGED; |
| if (trust_ctime && check_stat && |
| sd->sd_ctime.sec != (unsigned int)st->st_ctime) |
| changed |= CTIME_CHANGED; |
| |
| #ifdef USE_NSEC |
| if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st)) |
| changed |= MTIME_CHANGED; |
| if (trust_ctime && check_stat && |
| sd->sd_ctime.nsec != ST_CTIME_NSEC(*st)) |
| changed |= CTIME_CHANGED; |
| #endif |
| |
| if (check_stat) { |
| if (sd->sd_uid != (unsigned int) st->st_uid || |
| sd->sd_gid != (unsigned int) st->st_gid) |
| changed |= OWNER_CHANGED; |
| if (sd->sd_ino != (unsigned int) st->st_ino) |
| changed |= INODE_CHANGED; |
| } |
| |
| #ifdef USE_STDEV |
| /* |
| * st_dev breaks on network filesystems where different |
| * clients will have different views of what "device" |
| * the filesystem is on |
| */ |
| if (check_stat && sd->sd_dev != (unsigned int) st->st_dev) |
| changed |= INODE_CHANGED; |
| #endif |
| |
| if (sd->sd_size != munge_st_size(st->st_size)) |
| changed |= DATA_CHANGED; |
| |
| return changed; |
| } |
| |
| void stat_validity_clear(struct stat_validity *sv) |
| { |
| FREE_AND_NULL(sv->sd); |
| } |
| |
| int stat_validity_check(struct stat_validity *sv, const char *path) |
| { |
| struct stat st; |
| |
| if (stat(path, &st) < 0) |
| return sv->sd == NULL; |
| if (!sv->sd) |
| return 0; |
| return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st); |
| } |
| |
| void stat_validity_update(struct stat_validity *sv, int fd) |
| { |
| struct stat st; |
| |
| if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode)) |
| stat_validity_clear(sv); |
| else { |
| if (!sv->sd) |
| CALLOC_ARRAY(sv->sd, 1); |
| fill_stat_data(sv->sd, &st); |
| } |
| } |