| Elijah Newren | 90cbae9 | 2023-05-16 06:33:48 | [diff] [blame] | 1 | #include "git-compat-util.h" |
| 2 | #include "environment.h" |
| 3 | #include "statinfo.h" |
| 4 | |
| Jason Hatton | 5143ac0 | 2023-10-12 16:09:30 | [diff] [blame] | 5 | /* |
| 6 | * Munge st_size into an unsigned int. |
| 7 | */ |
| 8 | static unsigned int munge_st_size(off_t st_size) { |
| 9 | unsigned int sd_size = st_size; |
| 10 | |
| 11 | /* |
| 12 | * If the file is an exact multiple of 4 GiB, modify the value so it |
| 13 | * doesn't get marked as racily clean (zero). |
| 14 | */ |
| 15 | if (!sd_size && st_size) |
| 16 | return 0x80000000; |
| 17 | else |
| 18 | return sd_size; |
| 19 | } |
| 20 | |
| Elijah Newren | 90cbae9 | 2023-05-16 06:33:48 | [diff] [blame] | 21 | void fill_stat_data(struct stat_data *sd, struct stat *st) |
| 22 | { |
| 23 | sd->sd_ctime.sec = (unsigned int)st->st_ctime; |
| 24 | sd->sd_mtime.sec = (unsigned int)st->st_mtime; |
| 25 | sd->sd_ctime.nsec = ST_CTIME_NSEC(*st); |
| 26 | sd->sd_mtime.nsec = ST_MTIME_NSEC(*st); |
| 27 | sd->sd_dev = st->st_dev; |
| 28 | sd->sd_ino = st->st_ino; |
| 29 | sd->sd_uid = st->st_uid; |
| 30 | sd->sd_gid = st->st_gid; |
| Jason Hatton | 5143ac0 | 2023-10-12 16:09:30 | [diff] [blame] | 31 | sd->sd_size = munge_st_size(st->st_size); |
| Elijah Newren | 90cbae9 | 2023-05-16 06:33:48 | [diff] [blame] | 32 | } |
| 33 | |
| Junio C Hamano | c33fa87 | 2023-09-14 21:46:46 | [diff] [blame] | 34 | static void set_times(struct stat *st, const struct stat_data *sd) |
| 35 | { |
| 36 | st->st_ctime = sd->sd_ctime.sec; |
| 37 | st->st_mtime = sd->sd_mtime.sec; |
| 38 | #ifdef NO_NSEC |
| 39 | ; /* nothing */ |
| 40 | #else |
| 41 | #ifdef USE_ST_TIMESPEC |
| 42 | st->st_ctimespec.tv_nsec = sd->sd_ctime.nsec; |
| 43 | st->st_mtimespec.tv_nsec = sd->sd_mtime.nsec; |
| 44 | #else |
| 45 | st->st_ctim.tv_nsec = sd->sd_ctime.nsec; |
| 46 | st->st_mtim.tv_nsec = sd->sd_mtime.nsec; |
| 47 | #endif |
| 48 | #endif |
| 49 | } |
| 50 | |
| 51 | void fake_lstat_data(const struct stat_data *sd, struct stat *st) |
| 52 | { |
| 53 | set_times(st, sd); |
| 54 | st->st_dev = sd->sd_dev; |
| 55 | st->st_ino = sd->sd_ino; |
| 56 | st->st_uid = sd->sd_uid; |
| 57 | st->st_gid = sd->sd_gid; |
| 58 | st->st_size = sd->sd_size; |
| 59 | } |
| 60 | |
| Elijah Newren | 90cbae9 | 2023-05-16 06:33:48 | [diff] [blame] | 61 | int match_stat_data(const struct stat_data *sd, struct stat *st) |
| 62 | { |
| 63 | int changed = 0; |
| 64 | |
| 65 | if (sd->sd_mtime.sec != (unsigned int)st->st_mtime) |
| 66 | changed |= MTIME_CHANGED; |
| 67 | if (trust_ctime && check_stat && |
| 68 | sd->sd_ctime.sec != (unsigned int)st->st_ctime) |
| 69 | changed |= CTIME_CHANGED; |
| 70 | |
| 71 | #ifdef USE_NSEC |
| 72 | if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st)) |
| 73 | changed |= MTIME_CHANGED; |
| 74 | if (trust_ctime && check_stat && |
| 75 | sd->sd_ctime.nsec != ST_CTIME_NSEC(*st)) |
| 76 | changed |= CTIME_CHANGED; |
| 77 | #endif |
| 78 | |
| 79 | if (check_stat) { |
| 80 | if (sd->sd_uid != (unsigned int) st->st_uid || |
| 81 | sd->sd_gid != (unsigned int) st->st_gid) |
| 82 | changed |= OWNER_CHANGED; |
| 83 | if (sd->sd_ino != (unsigned int) st->st_ino) |
| 84 | changed |= INODE_CHANGED; |
| 85 | } |
| 86 | |
| 87 | #ifdef USE_STDEV |
| 88 | /* |
| 89 | * st_dev breaks on network filesystems where different |
| 90 | * clients will have different views of what "device" |
| 91 | * the filesystem is on |
| 92 | */ |
| 93 | if (check_stat && sd->sd_dev != (unsigned int) st->st_dev) |
| 94 | changed |= INODE_CHANGED; |
| 95 | #endif |
| 96 | |
| Jason Hatton | 5143ac0 | 2023-10-12 16:09:30 | [diff] [blame] | 97 | if (sd->sd_size != munge_st_size(st->st_size)) |
| Elijah Newren | 90cbae9 | 2023-05-16 06:33:48 | [diff] [blame] | 98 | changed |= DATA_CHANGED; |
| 99 | |
| 100 | return changed; |
| 101 | } |
| 102 | |
| 103 | void stat_validity_clear(struct stat_validity *sv) |
| 104 | { |
| 105 | FREE_AND_NULL(sv->sd); |
| 106 | } |
| 107 | |
| 108 | int stat_validity_check(struct stat_validity *sv, const char *path) |
| 109 | { |
| 110 | struct stat st; |
| 111 | |
| 112 | if (stat(path, &st) < 0) |
| 113 | return sv->sd == NULL; |
| 114 | if (!sv->sd) |
| 115 | return 0; |
| 116 | return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st); |
| 117 | } |
| 118 | |
| 119 | void stat_validity_update(struct stat_validity *sv, int fd) |
| 120 | { |
| 121 | struct stat st; |
| 122 | |
| 123 | if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode)) |
| 124 | stat_validity_clear(sv); |
| 125 | else { |
| 126 | if (!sv->sd) |
| 127 | CALLOC_ARRAY(sv->sd, 1); |
| 128 | fill_stat_data(sv->sd, &st); |
| 129 | } |
| 130 | } |
