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+From: Austin Clements <amdragon@MIT.EDU>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v3 2/4] new: Centralize file type stat-ing logic\r
+Date: Thu, 24 May 2012 15:32:00 -0400\r
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+\r
+This moves our logic to get a file's type into one function. This has\r
+several benefits: we can support OSes and file systems that do not\r
+provide dirent.d_type or always return DT_UNKNOWN, complex\r
+symlink-handling logic has been replaced by a simple stat fall-through\r
+in one place, and the error message for un-stat-able file is more\r
+accurate (previously, the error always mentioned directories, even\r
+though a broken symlink is not a directory).\r
+---\r
+ notmuch-new.c | 103 +++++++++++++++++++++++++++++++++++----------------------\r
+ test/new | 2 +-\r
+ 2 files changed, 64 insertions(+), 41 deletions(-)\r
+\r
+diff --git a/notmuch-new.c b/notmuch-new.c\r
+index 72dd558..c64f1a7 100644\r
+--- a/notmuch-new.c\r
++++ b/notmuch-new.c\r
+@@ -154,6 +154,48 @@ dirent_sort_strcmp_name (const struct dirent **a, const struct dirent **b)\r
+ return strcmp ((*a)->d_name, (*b)->d_name);\r
+ }\r
+ \r
++/* Return the type of a directory entry relative to path as a stat(2)\r
++ * mode. Like stat, this follows symlinks. Returns -1 and sets errno\r
++ * if the file's type cannot be determined (which includes dangling\r
++ * symlinks).\r
++ */\r
++static int\r
++dirent_type (const char *path, const struct dirent *entry)\r
++{\r
++ struct stat statbuf;\r
++ char *abspath;\r
++ int err, saved_errno;\r
++\r
++#ifdef _DIRENT_HAVE_D_TYPE\r
++ /* Mapping from d_type to stat mode_t. We omit DT_LNK so that\r
++ * we'll fall through to stat and get the real file type. */\r
++ static const mode_t modes[] = {\r
++ [DT_BLK] = S_IFBLK,\r
++ [DT_CHR] = S_IFCHR,\r
++ [DT_DIR] = S_IFDIR,\r
++ [DT_FIFO] = S_IFIFO,\r
++ [DT_REG] = S_IFREG,\r
++ [DT_SOCK] = S_IFSOCK\r
++ };\r
++ if (entry->d_type < ARRAY_SIZE(modes) && modes[entry->d_type])\r
++ return modes[entry->d_type];\r
++#endif\r
++\r
++ abspath = talloc_asprintf (NULL, "%s/%s", path, entry->d_name);\r
++ if (!abspath) {\r
++ errno = ENOMEM;\r
++ return -1;\r
++ }\r
++ err = stat(abspath, &statbuf);\r
++ saved_errno = errno;\r
++ talloc_free (abspath);\r
++ if (err < 0) {\r
++ errno = saved_errno;\r
++ return -1;\r
++ }\r
++ return statbuf.st_mode & S_IFMT;\r
++}\r
++\r
+ /* Test if the directory looks like a Maildir directory.\r
+ *\r
+ * Search through the array of directory entries to see if we can find all\r
+@@ -162,12 +204,12 @@ dirent_sort_strcmp_name (const struct dirent **a, const struct dirent **b)\r
+ * Return 1 if the directory looks like a Maildir and 0 otherwise.\r
+ */\r
+ static int\r
+-_entries_resemble_maildir (struct dirent **entries, int count)\r
++_entries_resemble_maildir (const char *path, struct dirent **entries, int count)\r
+ {\r
+ int i, found = 0;\r
+ \r
+ for (i = 0; i < count; i++) {\r
+- if (entries[i]->d_type != DT_DIR && entries[i]->d_type != DT_UNKNOWN)\r
++ if (dirent_type (path, entries[i]) != S_IFDIR)\r
+ continue;\r
+ \r
+ if (strcmp(entries[i]->d_name, "new") == 0 ||\r
+@@ -250,7 +292,7 @@ add_files_recursive (notmuch_database_t *notmuch,\r
+ notmuch_status_t status, ret = NOTMUCH_STATUS_SUCCESS;\r
+ notmuch_message_t *message = NULL;\r
+ struct dirent **fs_entries = NULL;\r
+- int i, num_fs_entries = 0;\r
++ int i, num_fs_entries = 0, entry_type;\r
+ notmuch_directory_t *directory;\r
+ notmuch_filenames_t *db_files = NULL;\r
+ notmuch_filenames_t *db_subdirs = NULL;\r
+@@ -300,7 +342,7 @@ add_files_recursive (notmuch_database_t *notmuch,\r
+ }\r
+ \r
+ /* Pass 1: Recurse into all sub-directories. */\r
+- is_maildir = _entries_resemble_maildir (fs_entries, num_fs_entries);\r
++ is_maildir = _entries_resemble_maildir (path, fs_entries, num_fs_entries);\r
+ \r
+ for (i = 0; i < num_fs_entries; i++) {\r
+ if (interrupted)\r
+@@ -308,17 +350,16 @@ add_files_recursive (notmuch_database_t *notmuch,\r
+ \r
+ entry = fs_entries[i];\r
+ \r
+- /* We only want to descend into directories.\r
+- * But symlinks can be to directories too, of course.\r
+- *\r
+- * And if the filesystem doesn't tell us the file type in the\r
+- * scandir results, then it might be a directory (and if not,\r
+- * then we'll stat and return immediately in the next level of\r
+- * recursion). */\r
+- if (entry->d_type != DT_DIR &&\r
+- entry->d_type != DT_LNK &&\r
+- entry->d_type != DT_UNKNOWN)\r
+- {\r
++ /* We only want to descend into directories (and symlinks to\r
++ * directories). */\r
++ entry_type = dirent_type (path, entry);\r
++ if (entry_type == -1) {\r
++ /* Be pessimistic, e.g. so we don't lose lots of mail just\r
++ * because a user broke a symlink. */\r
++ fprintf (stderr, "Error reading file %s/%s: %s\n",\r
++ path, entry->d_name, strerror (errno));\r
++ return NOTMUCH_STATUS_FILE_ERROR;\r
++ } else if (entry_type != S_IFDIR) {\r
+ continue;\r
+ }\r
+ \r
+@@ -407,31 +448,13 @@ add_files_recursive (notmuch_database_t *notmuch,\r
+ notmuch_filenames_move_to_next (db_subdirs);\r
+ }\r
+ \r
+- /* If we're looking at a symlink, we only want to add it if it\r
+- * links to a regular file, (and not to a directory, say).\r
+- *\r
+- * Similarly, if the file is of unknown type (due to filesystem\r
+- * limitations), then we also need to look closer.\r
+- *\r
+- * In either case, a stat does the trick.\r
+- */\r
+- if (entry->d_type == DT_LNK || entry->d_type == DT_UNKNOWN) {\r
+- int err;\r
+-\r
+- next = talloc_asprintf (notmuch, "%s/%s", path, entry->d_name);\r
+- err = stat (next, &st);\r
+- talloc_free (next);\r
+- next = NULL;\r
+-\r
+- /* Don't emit an error for a link pointing nowhere, since\r
+- * the directory-traversal pass will have already done\r
+- * that. */\r
+- if (err)\r
+- continue;\r
+-\r
+- if (! S_ISREG (st.st_mode))\r
+- continue;\r
+- } else if (entry->d_type != DT_REG) {\r
++ /* Only add regular files (and symlinks to regular files). */\r
++ entry_type = dirent_type (path, entry);\r
++ if (entry_type == -1) {\r
++ fprintf (stderr, "Error reading file %s/%s: %s\n",\r
++ path, entry->d_name, strerror (errno));\r
++ return NOTMUCH_STATUS_FILE_ERROR;\r
++ } else if (entry_type != S_IFREG) {\r
+ continue;\r
+ }\r
+ \r
+diff --git a/test/new b/test/new\r
+index a7bc146..cab7c01 100755\r
+--- a/test/new\r
++++ b/test/new\r
+@@ -140,7 +140,7 @@ test_begin_subtest "Broken symlink aborts"\r
+ ln -s does-not-exist "${MAIL_DIR}/broken"\r
+ output=$(NOTMUCH_NEW 2>&1)\r
+ test_expect_equal "$output" \\r
+-"Error reading directory ${MAIL_DIR}/broken: No such file or directory\r
++"Error reading file ${MAIL_DIR}/broken: No such file or directory\r
+ Note: A fatal error was encountered: Something went wrong trying to read or write a file\r
+ No new mail."\r
+ rm "${MAIL_DIR}/broken"\r
+-- \r
+1.7.10\r
+\r
projects / notmuch-archives.git / commitdiff