| 1 | #include "git-compat-util.h" |
| 2 | #include "fsmonitor-ll.h" |
| 3 | #include "fsmonitor-path-utils.h" |
| 4 | #include "gettext.h" |
| 5 | #include "trace.h" |
| 6 | #include <dirent.h> |
| 7 | #include <errno.h> |
| 8 | #include <fcntl.h> |
| 9 | #include <sys/param.h> |
| 10 | #include <sys/mount.h> |
| 11 | |
| 12 | int fsmonitor__get_fs_info(const char *path, struct fs_info *fs_info) |
| 13 | { |
| 14 | struct statfs fs; |
| 15 | if (statfs(path, &fs) == -1) { |
| 16 | int saved_errno = errno; |
| 17 | trace_printf_key(&trace_fsmonitor, "statfs('%s') failed: %s", |
| 18 | path, strerror(saved_errno)); |
| 19 | errno = saved_errno; |
| 20 | return -1; |
| 21 | } |
| 22 | |
| 23 | trace_printf_key(&trace_fsmonitor, |
| 24 | "statfs('%s') [type 0x%08x][flags 0x%08x] '%s'", |
| 25 | path, fs.f_type, fs.f_flags, fs.f_fstypename); |
| 26 | |
| 27 | if (!(fs.f_flags & MNT_LOCAL)) |
| 28 | fs_info->is_remote = 1; |
| 29 | else |
| 30 | fs_info->is_remote = 0; |
| 31 | |
| 32 | fs_info->typename = xstrdup(fs.f_fstypename); |
| 33 | |
| 34 | trace_printf_key(&trace_fsmonitor, |
| 35 | "'%s' is_remote: %d", |
| 36 | path, fs_info->is_remote); |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | int fsmonitor__is_fs_remote(const char *path) |
| 41 | { |
| 42 | struct fs_info fs; |
| 43 | if (fsmonitor__get_fs_info(path, &fs)) |
| 44 | return -1; |
| 45 | |
| 46 | free(fs.typename); |
| 47 | |
| 48 | return fs.is_remote; |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * Scan the root directory for synthetic firmlinks that when resolved |
| 53 | * are a prefix of the path, stopping at the first one found. |
| 54 | * |
| 55 | * Some information about firmlinks and synthetic firmlinks: |
| 56 | * https://eclecticlight.co/2020/01/23/catalina-boot-volumes/ |
| 57 | * |
| 58 | * macOS no longer allows symlinks in the root directory; any link found |
| 59 | * there is therefore a synthetic firmlink. |
| 60 | * |
| 61 | * If this function gets called often, will want to cache all the firmlink |
| 62 | * information, but for now there is only one caller of this function. |
| 63 | * |
| 64 | * If there is more than one alias for the path, that is another |
| 65 | * matter altogether. |
| 66 | */ |
| 67 | int fsmonitor__get_alias(const char *path, struct alias_info *info) |
| 68 | { |
| 69 | DIR *dir; |
| 70 | int retval = -1; |
| 71 | const char *const root = "/"; |
| 72 | struct stat st; |
| 73 | struct dirent *de; |
| 74 | struct strbuf alias; |
| 75 | struct strbuf points_to = STRBUF_INIT; |
| 76 | |
| 77 | dir = opendir(root); |
| 78 | if (!dir) |
| 79 | return error_errno(_("opendir('%s') failed"), root); |
| 80 | |
| 81 | strbuf_init(&alias, 256); |
| 82 | |
| 83 | while ((de = readdir(dir)) != NULL) { |
| 84 | strbuf_reset(&alias); |
| 85 | strbuf_addf(&alias, "%s%s", root, de->d_name); |
| 86 | |
| 87 | if (lstat(alias.buf, &st) < 0) { |
| 88 | error_errno(_("lstat('%s') failed"), alias.buf); |
| 89 | goto done; |
| 90 | } |
| 91 | |
| 92 | if (!S_ISLNK(st.st_mode)) |
| 93 | continue; |
| 94 | |
| 95 | if (strbuf_readlink(&points_to, alias.buf, st.st_size) < 0) { |
| 96 | error_errno(_("strbuf_readlink('%s') failed"), alias.buf); |
| 97 | goto done; |
| 98 | } |
| 99 | |
| 100 | if (!strncmp(points_to.buf, path, points_to.len) && |
| 101 | (path[points_to.len] == '/')) { |
| 102 | strbuf_addbuf(&info->alias, &alias); |
| 103 | strbuf_addbuf(&info->points_to, &points_to); |
| 104 | trace_printf_key(&trace_fsmonitor, |
| 105 | "Found alias for '%s' : '%s' -> '%s'", |
| 106 | path, info->alias.buf, info->points_to.buf); |
| 107 | retval = 0; |
| 108 | goto done; |
| 109 | } |
| 110 | } |
| 111 | retval = 0; /* no alias */ |
| 112 | |
| 113 | done: |
| 114 | strbuf_release(&alias); |
| 115 | strbuf_release(&points_to); |
| 116 | if (closedir(dir) < 0) |
| 117 | return error_errno(_("closedir('%s') failed"), root); |
| 118 | return retval; |
| 119 | } |
| 120 | |
| 121 | char *fsmonitor__resolve_alias(const char *path, |
| 122 | const struct alias_info *info) |
| 123 | { |
| 124 | if (!info->alias.len) |
| 125 | return NULL; |
| 126 | |
| 127 | if ((!strncmp(info->alias.buf, path, info->alias.len)) |
| 128 | && path[info->alias.len] == '/') { |
| 129 | struct strbuf tmp = STRBUF_INIT; |
| 130 | const char *remainder = path + info->alias.len; |
| 131 | |
| 132 | strbuf_addbuf(&tmp, &info->points_to); |
| 133 | strbuf_add(&tmp, remainder, strlen(remainder)); |
| 134 | return strbuf_detach(&tmp, NULL); |
| 135 | } |
| 136 | |
| 137 | return NULL; |
| 138 | } |