X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Ftmpfiles%2Ftmpfiles.c;h=68cfa55ce9cee09e96985c76ac2390cfbe5140f7;hb=2f3b873a49734f8ecc8d929612d33153acbda891;hp=4c0f23e2ed53bb99991d01a8d635f7e089966e39;hpb=9339db7187c61eb7ae7e6ffcddb2b2f2686954eb;p=elogind.git

diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index 4c0f23e2e..68cfa55ce 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -99,20 +99,22 @@ typedef struct Item {
         bool gid_set:1;
         bool mode_set:1;
         bool age_set:1;
+        bool mask_perms:1;
 
         bool keep_first_level:1;
-} Item;
 
-static Hashmap *items = NULL, *globs = NULL;
-static Set *unix_sockets = NULL;
+        bool force:1;
+
+        bool done:1;
+} Item;
 
 static bool arg_create = false;
 static bool arg_clean = false;
 static bool arg_remove = false;
 static bool arg_boot = false;
 
-static char **include_prefixes = NULL;
-static char **exclude_prefixes = NULL;
+static char **arg_include_prefixes = NULL;
+static char **arg_exclude_prefixes = NULL;
 static char *arg_root = NULL;
 
 static const char conf_file_dirs[] =
@@ -127,6 +129,9 @@ static const char conf_file_dirs[] =
 
 #define MAX_DEPTH 256
 
+static Hashmap *items = NULL, *globs = NULL;
+static Set *unix_sockets = NULL;
+
 static bool needs_glob(ItemType t) {
         return IN_SET(t,
                       WRITE_FILE,
@@ -447,52 +452,61 @@ finish:
         return r;
 }
 
-static int item_set_perms_full(Item *i, const char *path, bool ignore_enoent) {
+static int item_set_perms(Item *i, const char *path) {
         assert(i);
         assert(path);
 
         /* not using i->path directly because it may be a glob */
-        if (i->mode_set)
-                if (chmod(path, i->mode) < 0) {
-                        if (errno != ENOENT || !ignore_enoent) {
-                                log_error("chmod(%s) failed: %m", path);
-                                return -errno;
+        if (i->mode_set) {
+                mode_t m = i->mode;
+
+                if (i->mask_perms) {
+                        struct stat st;
+
+                        if (stat(path, &st) >= 0) {
+                                if (!(st.st_mode & 0111))
+                                        m &= ~0111;
+                                if (!(st.st_mode & 0222))
+                                        m &= ~0222;
+                                if (!(st.st_mode & 0444))
+                                        m &= ~0444;
+                                if (!S_ISDIR(st.st_mode))
+                                        m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
                         }
                 }
 
+                if (chmod(path, m) < 0) {
+                        log_error("chmod(%s) failed: %m", path);
+                        return -errno;
+                }
+        }
+
         if (i->uid_set || i->gid_set)
                 if (chown(path,
                           i->uid_set ? i->uid : (uid_t) -1,
                           i->gid_set ? i->gid : (gid_t) -1) < 0) {
 
-                        if (errno != ENOENT || !ignore_enoent) {
-                                log_error("chown(%s) failed: %m", path);
-                                return -errno;
-                        }
+                        log_error("chown(%s) failed: %m", path);
+                        return -errno;
                 }
 
-        return label_fix(path, ignore_enoent, false);
-}
-
-static int item_set_perms(Item *i, const char *path) {
-        return item_set_perms_full(i, path, false);
+        return label_fix(path, false, false);
 }
 
 static int write_one_file(Item *i, const char *path) {
-        int flags;
-        int fd = -1;
+        _cleanup_close_ int fd = -1;
+        int flags, r = 0;
         struct stat st;
-        int r = 0;
 
         assert(i);
         assert(path);
 
-        flags = i->type == CREATE_FILE ? O_CREAT|O_APPEND :
-                i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC : 0;
+        flags = i->type == CREATE_FILE ? O_CREAT|O_APPEND|O_NOFOLLOW :
+                i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC|O_NOFOLLOW : 0;
 
-        RUN_WITH_UMASK(0) {
+        RUN_WITH_UMASK(0000) {
                 label_context_set(path, S_IFREG);
-                fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, i->mode);
+                fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
                 label_context_clear();
         }
 
@@ -510,22 +524,19 @@ static int write_one_file(Item *i, const char *path) {
                 size_t l;
 
                 unescaped = cunescape(i->argument);
-                if (unescaped == NULL) {
-                        safe_close(fd);
+                if (!unescaped)
                         return log_oom();
-                }
 
                 l = strlen(unescaped);
                 n = write(fd, unescaped, l);
 
                 if (n < 0 || (size_t) n < l) {
                         log_error("Failed to write file %s: %s", path, n < 0 ? strerror(-n) : "Short write");
-                        safe_close(fd);
                         return n < 0 ? n : -EIO;
                 }
         }
 
-        safe_close(fd);
+        fd = safe_close(fd);
 
         if (stat(path, &st) < 0) {
                 log_error("stat(%s) failed: %m", path);
@@ -656,10 +667,29 @@ static int create_item(Item *i) {
                 break;
 
         case COPY_FILES:
-                r = copy_tree(i->argument, i->path);
+                r = copy_tree(i->argument, i->path, false);
                 if (r < 0) {
-                        log_error("Failed to copy files: %s", strerror(-r));
-                        return r;
+                        struct stat a, b;
+
+                        if (r != -EEXIST) {
+                                log_error("Failed to copy files to %s: %s", i->path, strerror(-r));
+                                return -r;
+                        }
+
+                        if (stat(i->argument, &a) < 0) {
+                                log_error("stat(%s) failed: %m", i->argument);
+                                return -errno;
+                        }
+
+                        if (stat(i->path, &b) < 0) {
+                                log_error("stat(%s) failed: %m", i->path);
+                                return -errno;
+                        }
+
+                        if ((a.st_mode ^ b.st_mode) & S_IFMT) {
+                                log_debug("Can't copy to %s, file exists already and is of different type", i->path);
+                                return 0;
+                        }
                 }
 
                 r = item_set_perms(i, i->path);
@@ -680,22 +710,24 @@ static int create_item(Item *i) {
 
                 RUN_WITH_UMASK(0000) {
                         mkdir_parents_label(i->path, 0755);
-                        r = mkdir(i->path, i->mode);
+                        r = mkdir_label(i->path, i->mode);
                 }
 
-                if (r < 0 && errno != EEXIST) {
-                        log_error("Failed to create directory %s: %m", i->path);
-                        return -errno;
-                }
+                if (r < 0) {
+                        if (r != -EEXIST) {
+                                log_error("Failed to create directory %s: %s", i->path, strerror(-r));
+                                return r;
+                        }
 
-                if (stat(i->path, &st) < 0) {
-                        log_error("stat(%s) failed: %m", i->path);
-                        return -errno;
-                }
+                        if (stat(i->path, &st) < 0) {
+                                log_error("stat(%s) failed: %m", i->path);
+                                return -errno;
+                        }
 
-                if (!S_ISDIR(st.st_mode)) {
-                        log_error("%s is not a directory.", i->path);
-                        return -EEXIST;
+                        if (!S_ISDIR(st.st_mode)) {
+                                log_debug("%s already exists and is not a directory.", i->path);
+                                return 0;
+                        }
                 }
 
                 r = item_set_perms(i, i->path);
@@ -707,22 +739,41 @@ static int create_item(Item *i) {
         case CREATE_FIFO:
 
                 RUN_WITH_UMASK(0000) {
+                        label_context_set(i->path, S_IFIFO);
                         r = mkfifo(i->path, i->mode);
+                        label_context_clear();
                 }
 
-                if (r < 0 && errno != EEXIST) {
-                        log_error("Failed to create fifo %s: %m", i->path);
-                        return -errno;
-                }
+                if (r < 0) {
+                        if (errno != EEXIST) {
+                                log_error("Failed to create fifo %s: %m", i->path);
+                                return -errno;
+                        }
 
-                if (stat(i->path, &st) < 0) {
-                        log_error("stat(%s) failed: %m", i->path);
-                        return -errno;
-                }
+                        if (stat(i->path, &st) < 0) {
+                                log_error("stat(%s) failed: %m", i->path);
+                                return -errno;
+                        }
+
+                        if (!S_ISFIFO(st.st_mode)) {
+
+                                if (i->force) {
 
-                if (!S_ISFIFO(st.st_mode)) {
-                        log_error("%s is not a fifo.", i->path);
-                        return -EEXIST;
+                                        RUN_WITH_UMASK(0000) {
+                                                label_context_set(i->path, S_IFIFO);
+                                                r = mkfifo_atomic(i->path, i->mode);
+                                                label_context_clear();
+                                        }
+
+                                        if (r < 0) {
+                                                log_error("Failed to create fifo %s: %s", i->path, strerror(-r));
+                                                return r;
+                                        }
+                                } else {
+                                        log_debug("%s is not a fifo.", i->path);
+                                        return 0;
+                                }
+                        }
                 }
 
                 r = item_set_perms(i, i->path);
@@ -731,31 +782,40 @@ static int create_item(Item *i) {
 
                 break;
 
-        case CREATE_SYMLINK: {
-                _cleanup_free_ char *x = NULL;
+        case CREATE_SYMLINK:
 
                 label_context_set(i->path, S_IFLNK);
                 r = symlink(i->argument, i->path);
                 label_context_clear();
 
-                if (r < 0 && errno != EEXIST) {
-                        log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
-                        return -errno;
-                }
-
-                r = readlink_malloc(i->path, &x);
                 if (r < 0) {
-                        log_error("readlink(%s) failed: %s", i->path, strerror(-r));
-                        return -errno;
-                }
+                        _cleanup_free_ char *x = NULL;
+
+                        if (errno != EEXIST) {
+                                log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
+                                return -errno;
+                        }
+
+                        r = readlink_malloc(i->path, &x);
+                        if (r < 0 || !streq(i->argument, x)) {
 
-                if (!streq(i->argument, x)) {
-                        log_error("%s is not the right symlink.", i->path);
-                        return -EEXIST;
+                                if (i->force) {
+                                        label_context_set(i->path, S_IFLNK);
+                                        r = symlink_atomic(i->argument, i->path);
+                                        label_context_clear();
+
+                                        if (r < 0) {
+                                                log_error("symlink(%s, %s) failed: %s", i->argument, i->path, strerror(-r));
+                                                return r;
+                                        }
+                                } else {
+                                        log_debug("%s is not a symlink or does not point to the correct path.", i->path);
+                                        return 0;
+                                }
+                        }
                 }
 
                 break;
-        }
 
         case CREATE_BLOCK_DEVICE:
         case CREATE_CHAR_DEVICE: {
@@ -771,7 +831,7 @@ static int create_item(Item *i) {
                         return 0;
                 }
 
-                file_type = (i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
+                file_type = i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR;
 
                 RUN_WITH_UMASK(0000) {
                         label_context_set(i->path, file_type);
@@ -779,19 +839,42 @@ static int create_item(Item *i) {
                         label_context_clear();
                 }
 
-                if (r < 0 && errno != EEXIST) {
-                        log_error("Failed to create device node %s: %m", i->path);
-                        return -errno;
-                }
+                if (r < 0) {
+                        if (errno == EPERM) {
+                                log_debug("We lack permissions, possibly because of cgroup configuration; "
+                                          "skipping creation of device node %s.", i->path);
+                                return 0;
+                        }
 
-                if (stat(i->path, &st) < 0) {
-                        log_error("stat(%s) failed: %m", i->path);
-                        return -errno;
-                }
+                        if (errno != EEXIST) {
+                                log_error("Failed to create device node %s: %m", i->path);
+                                return -errno;
+                        }
 
-                if ((st.st_mode & S_IFMT) != file_type) {
-                        log_error("%s is not a device node.", i->path);
-                        return -EEXIST;
+                        if (stat(i->path, &st) < 0) {
+                                log_error("stat(%s) failed: %m", i->path);
+                                return -errno;
+                        }
+
+                        if ((st.st_mode & S_IFMT) != file_type) {
+
+                                if (i->force) {
+
+                                        RUN_WITH_UMASK(0000) {
+                                                label_context_set(i->path, file_type);
+                                                r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
+                                                label_context_clear();
+                                        }
+
+                                        if (r < 0) {
+                                                log_error("Failed to create device node %s: %s", i->path, strerror(-r));
+                                                return r;
+                                        }
+                                } else {
+                                        log_debug("%s is not a device node.", i->path);
+                                        return 0;
+                                }
+                        }
                 }
 
                 r = item_set_perms(i, i->path);
@@ -977,9 +1060,23 @@ static int clean_item(Item *i) {
 
 static int process_item(Item *i) {
         int r, q, p;
+        char prefix[PATH_MAX];
 
         assert(i);
 
+        if (i->done)
+                return 0;
+
+        i->done = true;
+
+        PATH_FOREACH_PREFIX(prefix, i->path) {
+                Item *j;
+
+                j = hashmap_get(items, prefix);
+                if (j)
+                        process_item(j);
+        }
+
         r = arg_create ? create_item(i) : 0;
         q = arg_remove ? remove_item(i) : 0;
         p = arg_clean ? clean_item(i) : 0;
@@ -994,7 +1091,9 @@ static int process_item(Item *i) {
 }
 
 static void item_free(Item *i) {
-        assert(i);
+
+        if (!i)
+                return;
 
         free(i->path);
         free(i->argument);
@@ -1048,19 +1147,17 @@ static bool item_equal(Item *a, Item *b) {
 static bool should_include_path(const char *path) {
         char **prefix;
 
-        STRV_FOREACH(prefix, exclude_prefixes) {
+        STRV_FOREACH(prefix, arg_exclude_prefixes)
                 if (path_startswith(path, *prefix))
                         return false;
-        }
 
-        STRV_FOREACH(prefix, include_prefixes) {
+        STRV_FOREACH(prefix, arg_include_prefixes)
                 if (path_startswith(path, *prefix))
                         return true;
-        }
 
         /* no matches, so we should include this path only if we
          * have no whitelist at all */
-        return strv_length(include_prefixes) == 0;
+        return strv_length(arg_include_prefixes) == 0;
 }
 
 static int parse_line(const char *fname, unsigned line, const char *buffer) {
@@ -1098,10 +1195,17 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
                 return -EIO;
         }
 
-        if (strlen(action) > 2 || (strlen(action) > 1 && action[1] != '!')) {
-                log_error("[%s:%u] Unknown modifier '%s'", fname, line, action);
+        if (isempty(action)) {
+                log_error("[%s:%u] Command too short '%s'.", fname, line, action);
+                return -EINVAL;
+        }
+
+        if (strlen(action) > 1 && !in_charset(action+1, "!+")) {
+                log_error("[%s:%u] Unknown modifiers in command '%s'", fname, line, action);
                 return -EINVAL;
-        } else if (strlen(action) > 1 && !arg_boot)
+        }
+
+        if (strchr(action+1, '!') && !arg_boot)
                 return 0;
 
         type = action[0];
@@ -1110,6 +1214,8 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
         if (!i)
                 return log_oom();
 
+        i->force = !!strchr(action+1, '+');
+
         r = specifier_printf(path, specifier_table, NULL, &i->path);
         if (r < 0) {
                 log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, path);
@@ -1125,7 +1231,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
                 }
         }
 
-        switch(type) {
+        switch (type) {
 
         case CREATE_FILE:
         case TRUNCATE_FILE:
@@ -1143,10 +1249,10 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
 
         case CREATE_SYMLINK:
                 if (!i->argument) {
-                        log_error("[%s:%u] Symlink file requires argument.", fname, line);
-                        return -EBADMSG;
+                        i->argument = strappend("/usr/share/factory", i->path);
+                        if (!i->argument)
+                                return log_oom();
                 }
-
                 break;
 
         case WRITE_FILE:
@@ -1158,8 +1264,9 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
 
         case COPY_FILES:
                 if (!i->argument) {
-                        log_error("[%s:%u] Copy files requires argument.", fname, line);
-                        return -EBADMSG;
+                        i->argument = strappend("/usr/share/factory", i->path);
+                        if (!i->argument)
+                                return log_oom();
                 }
 
                 if (!path_is_absolute(i->argument)) {
@@ -1189,7 +1296,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
         }
 
         default:
-                log_error("[%s:%u] Unknown file type '%c'.", fname, line, type);
+                log_error("[%s:%u] Unknown command type '%c'.", fname, line, type);
                 return -EBADMSG;
         }
 
@@ -1241,9 +1348,15 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
         }
 
         if (mode && !streq(mode, "-")) {
+                const char *mm = mode;
                 unsigned m;
 
-                if (sscanf(mode, "%o", &m) != 1) {
+                if (*mm == '~') {
+                        i->mask_perms = true;
+                        mm++;
+                }
+
+                if (sscanf(mm, "%o", &m) != 1) {
                         log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
                         return -ENOENT;
                 }
@@ -1372,19 +1485,21 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
 
                 case ARG_PREFIX:
-                        if (strv_push(&include_prefixes, optarg) < 0)
+                        if (strv_push(&arg_include_prefixes, optarg) < 0)
                                 return log_oom();
                         break;
 
                 case ARG_EXCLUDE_PREFIX:
-                        if (strv_push(&exclude_prefixes, optarg) < 0)
+                        if (strv_push(&arg_exclude_prefixes, optarg) < 0)
                                 return log_oom();
                         break;
 
                 case ARG_ROOT:
+                        free(arg_root);
                         arg_root = path_make_absolute_cwd(optarg);
                         if (!arg_root)
                                 return log_oom();
+
                         path_kill_slashes(arg_root);
                         break;
 
@@ -1482,7 +1597,7 @@ int main(int argc, char *argv[]) {
 
         r = parse_argv(argc, argv);
         if (r <= 0)
-                return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+                goto finish;
 
         log_set_target(LOG_TARGET_AUTO);
         log_parse_environment();
@@ -1544,8 +1659,8 @@ finish:
         hashmap_free(items);
         hashmap_free(globs);
 
-        free(include_prefixes);
-        free(exclude_prefixes);
+        free(arg_include_prefixes);
+        free(arg_exclude_prefixes);
         free(arg_root);
 
         set_free_free(unix_sockets);