| #include "fsmonitor.h" |
| #include "fsmonitor-path-utils.h" |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sys/param.h> |
| #include <sys/mount.h> |
| |
| int fsmonitor__get_fs_info(const char *path, struct fs_info *fs_info) |
| { |
| struct statfs fs; |
| if (statfs(path, &fs) == -1) { |
| int saved_errno = errno; |
| trace_printf_key(&trace_fsmonitor, "statfs('%s') failed: %s", |
| path, strerror(saved_errno)); |
| errno = saved_errno; |
| return -1; |
| } |
| |
| trace_printf_key(&trace_fsmonitor, |
| "statfs('%s') [type 0x%08x][flags 0x%08x] '%s'", |
| path, fs.f_type, fs.f_flags, fs.f_fstypename); |
| |
| if (!(fs.f_flags & MNT_LOCAL)) |
| fs_info->is_remote = 1; |
| else |
| fs_info->is_remote = 0; |
| |
| fs_info->typename = xstrdup(fs.f_fstypename); |
| |
| trace_printf_key(&trace_fsmonitor, |
| "'%s' is_remote: %d", |
| path, fs_info->is_remote); |
| return 0; |
| } |
| |
| int fsmonitor__is_fs_remote(const char *path) |
| { |
| struct fs_info fs; |
| if (fsmonitor__get_fs_info(path, &fs)) |
| return -1; |
| |
| free(fs.typename); |
| |
| return fs.is_remote; |
| } |
| |
| /* |
| * Scan the root directory for synthetic firmlinks that when resolved |
| * are a prefix of the path, stopping at the first one found. |
| * |
| * Some information about firmlinks and synthetic firmlinks: |
| * https://eclecticlight.co/2020/01/23/catalina-boot-volumes/ |
| * |
| * macOS no longer allows symlinks in the root directory; any link found |
| * there is therefore a synthetic firmlink. |
| * |
| * If this function gets called often, will want to cache all the firmlink |
| * information, but for now there is only one caller of this function. |
| * |
| * If there is more than one alias for the path, that is another |
| * matter altogether. |
| */ |
| int fsmonitor__get_alias(const char *path, struct alias_info *info) |
| { |
| DIR *dir; |
| int retval = -1; |
| const char *const root = "/"; |
| struct stat st; |
| struct dirent *de; |
| struct strbuf alias; |
| struct strbuf points_to = STRBUF_INIT; |
| |
| dir = opendir(root); |
| if (!dir) |
| return error_errno(_("opendir('%s') failed"), root); |
| |
| strbuf_init(&alias, 256); |
| |
| while ((de = readdir(dir)) != NULL) { |
| strbuf_reset(&alias); |
| strbuf_addf(&alias, "%s%s", root, de->d_name); |
| |
| if (lstat(alias.buf, &st) < 0) { |
| error_errno(_("lstat('%s') failed"), alias.buf); |
| goto done; |
| } |
| |
| if (!S_ISLNK(st.st_mode)) |
| continue; |
| |
| if (strbuf_readlink(&points_to, alias.buf, st.st_size) < 0) { |
| error_errno(_("strbuf_readlink('%s') failed"), alias.buf); |
| goto done; |
| } |
| |
| if (!strncmp(points_to.buf, path, points_to.len) && |
| (path[points_to.len] == '/')) { |
| strbuf_addbuf(&info->alias, &alias); |
| strbuf_addbuf(&info->points_to, &points_to); |
| trace_printf_key(&trace_fsmonitor, |
| "Found alias for '%s' : '%s' -> '%s'", |
| path, info->alias.buf, info->points_to.buf); |
| retval = 0; |
| goto done; |
| } |
| } |
| retval = 0; /* no alias */ |
| |
| done: |
| strbuf_release(&alias); |
| strbuf_release(&points_to); |
| if (closedir(dir) < 0) |
| return error_errno(_("closedir('%s') failed"), root); |
| return retval; |
| } |
| |
| char *fsmonitor__resolve_alias(const char *path, |
| const struct alias_info *info) |
| { |
| if (!info->alias.len) |
| return NULL; |
| |
| if ((!strncmp(info->alias.buf, path, info->alias.len)) |
| && path[info->alias.len] == '/') { |
| struct strbuf tmp = STRBUF_INIT; |
| const char *remainder = path + info->alias.len; |
| |
| strbuf_addbuf(&tmp, &info->points_to); |
| strbuf_add(&tmp, remainder, strlen(remainder)); |
| return strbuf_detach(&tmp, NULL); |
| } |
| |
| return NULL; |
| } |