Merge pull request systemd#4133 from keszybz/strerror-removal

Strerror removal and other janitorial cleanups

Author: martinpitt

TODO

@@ -23,12 +23,11 @@ External:
 
 Janitorial Clean-ups:
 
-* code cleanup: retire FOREACH_WORD_QUOTED, port to extract_first_word() loops instead
+* code cleanup: retire FOREACH_WORD_QUOTED, port to extract_first_word() loops instead.
+  For example, most conf parsing callbacks should use it.
 
 * replace manual readdir() loops with FOREACH_DIRENT or FOREACH_DIRENT_ALL
 
-* Get rid of the last strerror() invocations in favour of %m and strerror_r()
-
 * Rearrange tests so that the various test-xyz.c match a specific src/basic/xyz.c again
 
 Features:
@@ -114,8 +113,6 @@ Features:
 * journald: sigbus API via a signal-handler safe function that people may call
   from the SIGBUS handler
 
-* when using UTF8, ellipsize with "…" rather than "...", so that we can show more contents before truncating
-
 * move specifier expansion from service_spawn() into load-fragment.c
 
 * optionally, also require WATCHDOG=1 notifications during service start-up and shutdown
@@ -200,7 +197,7 @@ Features:
 * synchronize console access with BSD locks:
   http://lists.freedesktop.org/archives/systemd-devel/2014-October/024582.html
 
-* as soon as we have kdbus, and sender timestamps, revisit coalescing multiple parallel daemon reloads:
+* as soon as we have sender timestamps, revisit coalescing multiple parallel daemon reloads:
   http://lists.freedesktop.org/archives/systemd-devel/2014-December/025862.html
 
 * in systemctl list-unit-files: show the install value the presets would suggest for a service in a third column
@@ -240,10 +237,6 @@ Features:
 
 * timesyncd: add ugly bus calls to set NTP servers per-interface, for usage by NM
 
-* extract_many_words() should probably be used by a lot of code that
-  currently uses FOREACH_WORD and friends. For example, most conf
-  parsing callbacks should use it.
-
 * merge ~/.local/share and ~/.local/lib into one similar /usr/lib and /usr/share....
 
 * systemd.show_status= should probably have a mode where only failed

man/dnssec-trust-anchors.d.xml

@@ -160,14 +160,12 @@
   <refsect1>
     <title>Negative Trust Anchors</title>
 
-    <para>Negative trust anchors define domains where DNSSEC
-    validation shall be turned off. Negative trust anchor files are
-    found at the same location as positive trust anchor files, and
-    follow the same overriding rules. They are text files with the
-    <filename>.negative</filename> suffix. Empty lines and lines whose
-    first character is <literal>;</literal> are ignored. Each line
-    specifies one domain name where DNSSEC validation shall be
-    disabled on.</para>
+    <para>Negative trust anchors define domains where DNSSEC validation shall be turned
+    off. Negative trust anchor files are found at the same location as positive trust anchor files,
+    and follow the same overriding rules. They are text files with the
+    <filename>.negative</filename> suffix. Empty lines and lines whose first character is
+    <literal>;</literal> are ignored. Each line specifies one domain name which is the root of a DNS
+    subtree where validation shall be disabled.</para>
 
     <para>Negative trust anchors are useful to support private DNS
     subtrees that are not referenced from the Internet DNS hierarchy,

src/basic/string-util.c

@@ -443,7 +443,7 @@ static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_le
         if (old_length <= 3 || old_length <= new_length)
                 return strndup(s, old_length);
 
-        r = new0(char, new_length+1);
+        r = new0(char, new_length+3);
         if (!r)
                 return NULL;
 
@@ -453,12 +453,12 @@ static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_le
                 x = new_length - 3;
 
         memcpy(r, s, x);
-        r[x] = '.';
-        r[x+1] = '.';
-        r[x+2] = '.';
+        r[x] = 0xe2; /* tri-dot ellipsis: … */
+        r[x+1] = 0x80;
+        r[x+2] = 0xa6;
         memcpy(r + x + 3,
-               s + old_length - (new_length - x - 3),
-               new_length - x - 3);
+               s + old_length - (new_length - x - 1),
+               new_length - x - 1);
 
         return r;
 }

src/hostname/hostnamed.c

@@ -451,7 +451,7 @@ static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *
         r = context_update_kernel_hostname(c);
         if (r < 0) {
                 log_error_errno(r, "Failed to set host name: %m");
-                return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
+                return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
         }
 
         log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));
@@ -512,13 +512,13 @@ static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_
         r = context_update_kernel_hostname(c);
         if (r < 0) {
                 log_error_errno(r, "Failed to set host name: %m");
-                return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
+                return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
         }
 
         r = context_write_data_static_hostname(c);
         if (r < 0) {
                 log_error_errno(r, "Failed to write static host name: %m");
-                return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
+                return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
         }
 
         log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));
@@ -593,7 +593,7 @@ static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_mess
         r = context_write_data_machine_info(c);
         if (r < 0) {
                 log_error_errno(r, "Failed to write machine info: %m");
-                return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
+                return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
         }
 
         log_info("Changed %s to '%s'",

src/journal-remote/journal-gatewayd.c

@@ -475,20 +475,20 @@ static int request_handler_entries(
 
         r = open_journal(m);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %m");
 
         if (request_parse_accept(m, connection) < 0)
-                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.");
 
         if (request_parse_range(m, connection) < 0)
-                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Range header.\n");
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Range header.");
 
         if (request_parse_arguments(m, connection) < 0)
-                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse URL arguments.\n");
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse URL arguments.");
 
         if (m->discrete) {
                 if (!m->cursor)
-                        return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Discrete seeks require a cursor specification.\n");
+                        return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Discrete seeks require a cursor specification.");
 
                 m->n_entries = 1;
                 m->n_entries_set = true;
@@ -501,7 +501,7 @@ static int request_handler_entries(
         else if (m->n_skip < 0)
                 r = sd_journal_seek_tail(m->journal);
         if (r < 0)
-                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to seek in journal.\n");
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to seek in journal.");
 
         response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_entries, m, NULL);
         if (!response)
@@ -633,14 +633,14 @@ static int request_handler_fields(
 
         r = open_journal(m);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %m");
 
         if (request_parse_accept(m, connection) < 0)
-                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.");
 
         r = sd_journal_query_unique(m->journal, field);
         if (r < 0)
-                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to query unique fields.\n");
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to query unique fields.");
 
         response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_fields, m, NULL);
         if (!response)
@@ -699,10 +699,10 @@ static int request_handler_file(
 
         fd = open(path, O_RDONLY|O_CLOEXEC);
         if (fd < 0)
-                return mhd_respondf(connection, MHD_HTTP_NOT_FOUND, "Failed to open file %s: %m\n", path);
+                return mhd_respondf(connection, errno, MHD_HTTP_NOT_FOUND, "Failed to open file %s: %m", path);
 
         if (fstat(fd, &st) < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to stat file: %m\n");
+                return mhd_respondf(connection, errno, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to stat file: %m");
 
         response = MHD_create_response_from_fd_at_offset64(st.st_size, fd, 0);
         if (!response)
@@ -766,27 +766,27 @@ static int request_handler_machine(
 
         r = open_journal(m);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %m");
 
         r = sd_id128_get_machine(&mid);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine machine ID: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine machine ID: %m");
 
         r = sd_id128_get_boot(&bid);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine boot ID: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine boot ID: %m");
 
         hostname = gethostname_malloc();
         if (!hostname)
                 return respond_oom(connection);
 
         r = sd_journal_get_usage(m->journal, &usage);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s");
 
         r = sd_journal_get_cutoff_realtime_usec(m->journal, &cutoff_from, &cutoff_to);
         if (r < 0)
-                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s");
 
         if (parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &os_name, NULL) == -ENOENT)
                 (void) parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &os_name, NULL);
@@ -844,8 +844,7 @@ static int request_handler(
         assert(method);
 
         if (!streq(method, "GET"))
-                return mhd_respond(connection, MHD_HTTP_NOT_ACCEPTABLE,
-                                   "Unsupported method.\n");
+                return mhd_respond(connection, MHD_HTTP_NOT_ACCEPTABLE, "Unsupported method.");
 
 
         if (!*connection_cls) {
@@ -875,7 +874,7 @@ static int request_handler(
         if (streq(url, "/machine"))
                 return request_handler_machine(connection, *connection_cls);
 
-        return mhd_respond(connection, MHD_HTTP_NOT_FOUND, "Not found.\n");
+        return mhd_respond(connection, MHD_HTTP_NOT_FOUND, "Not found.");
 }
 
 static void help(void) {

src/journal-remote/journal-remote.c

@@ -524,13 +524,12 @@ static int process_http_upload(
                         log_warning("Failed to process data for connection %p", connection);
                         if (r == -E2BIG)
                                 return mhd_respondf(connection,
-                                                    MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
-                                                    "Entry is too large, maximum is %u bytes.\n",
-                                                    DATA_SIZE_MAX);
+                                                    r, MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
+                                                    "Entry is too large, maximum is " STRINGIFY(DATA_SIZE_MAX) " bytes.");
                         else
                                 return mhd_respondf(connection,
-                                                    MHD_HTTP_UNPROCESSABLE_ENTITY,
-                                                    "Processing failed: %s.", strerror(-r));
+                                                    r, MHD_HTTP_UNPROCESSABLE_ENTITY,
+                                                    "Processing failed: %m.");
                 }
         }
 
@@ -541,13 +540,14 @@ static int process_http_upload(
 
         remaining = source_non_empty(source);
         if (remaining > 0) {
-                log_warning("Premature EOFbyte. %zu bytes lost.", remaining);
-                return mhd_respondf(connection, MHD_HTTP_EXPECTATION_FAILED,
+                log_warning("Premature EOF byte. %zu bytes lost.", remaining);
+                return mhd_respondf(connection,
+                                    0, MHD_HTTP_EXPECTATION_FAILED,
                                     "Premature EOF. %zu bytes of trailing data not processed.",
                                     remaining);
         }
 
-        return mhd_respond(connection, MHD_HTTP_ACCEPTED, "OK.\n");
+        return mhd_respond(connection, MHD_HTTP_ACCEPTED, "OK.");
 };
 
 static int request_handler(
@@ -577,19 +577,16 @@ static int request_handler(
                                            *connection_cls);
 
         if (!streq(method, "POST"))
-                return mhd_respond(connection, MHD_HTTP_NOT_ACCEPTABLE,
-                                   "Unsupported method.\n");
+                return mhd_respond(connection, MHD_HTTP_NOT_ACCEPTABLE, "Unsupported method.");
 
         if (!streq(url, "/upload"))
-                return mhd_respond(connection, MHD_HTTP_NOT_FOUND,
-                                   "Not found.\n");
+                return mhd_respond(connection, MHD_HTTP_NOT_FOUND, "Not found.");
 
         header = MHD_lookup_connection_value(connection,
                                              MHD_HEADER_KIND, "Content-Type");
         if (!header || !streq(header, "application/vnd.fdo.journal"))
                 return mhd_respond(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
-                                   "Content-Type: application/vnd.fdo.journal"
-                                   " is required.\n");
+                                   "Content-Type: application/vnd.fdo.journal is required.");
 
         {
                 const union MHD_ConnectionInfo *ci;
@@ -599,7 +596,7 @@ static int request_handler(
                 if (!ci) {
                         log_error("MHD_get_connection_info failed: cannot get remote fd");
                         return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                           "Cannot check remote address");
+                                           "Cannot check remote address.");
                 }
 
                 fd = ci->connect_fd;
@@ -614,7 +611,7 @@ static int request_handler(
                 r = getpeername_pretty(fd, false, &hostname);
                 if (r < 0)
                         return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                           "Cannot check remote hostname");
+                                           "Cannot check remote hostname.");
         }
 
         assert(hostname);
@@ -623,8 +620,7 @@ static int request_handler(
         if (r == -ENOMEM)
                 return respond_oom(connection);
         else if (r < 0)
-                return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                   strerror(-r));
+                return mhd_respondf(connection, r, MHD_HTTP_INTERNAL_SERVER_ERROR, "%m");
 
         hostname = NULL;
         return MHD_YES;

src/journal-remote/microhttpd-util.c

@@ -48,15 +48,15 @@ void microhttpd_logger(void *arg, const char *fmt, va_list ap) {
 
 static int mhd_respond_internal(struct MHD_Connection *connection,
                                 enum MHD_RequestTerminationCode code,
-                                char *buffer,
+                                const char *buffer,
                                 size_t size,
                                 enum MHD_ResponseMemoryMode mode) {
         struct MHD_Response *response;
         int r;
 
         assert(connection);
 
-        response = MHD_create_response_from_buffer(size, buffer, mode);
+        response = MHD_create_response_from_buffer(size, (char*) buffer, mode);
         if (!response)
                 return MHD_NO;
 
@@ -72,28 +72,38 @@ int mhd_respond(struct MHD_Connection *connection,
                 enum MHD_RequestTerminationCode code,
                 const char *message) {
 
+        const char *fmt;
+
+        fmt = strjoina(message, "\n");
+
         return mhd_respond_internal(connection, code,
-                                    (char*) message, strlen(message),
+                                    fmt, strlen(message) + 1,
                                     MHD_RESPMEM_PERSISTENT);
 }
 
 int mhd_respond_oom(struct MHD_Connection *connection) {
-        return mhd_respond(connection, MHD_HTTP_SERVICE_UNAVAILABLE,  "Out of memory.\n");
+        return mhd_respond(connection, MHD_HTTP_SERVICE_UNAVAILABLE,  "Out of memory.");
 }
 
 int mhd_respondf(struct MHD_Connection *connection,
+                 int error,
                  enum MHD_RequestTerminationCode code,
                  const char *format, ...) {
 
+        const char *fmt;
         char *m;
         int r;
         va_list ap;
 
         assert(connection);
         assert(format);
 
+        if (error < 0)
+                error = -error;
+        errno = -error;
+        fmt = strjoina(format, "\n");
         va_start(ap, format);
-        r = vasprintf(&m, format, ap);
+        r = vasprintf(&m, fmt, ap);
         va_end(ap);
 
         if (r < 0)