journalctl: add --exclude-identifier option

man/journalctl.xml

@@ -362,6 +362,18 @@
         <xi:include href="version-info.xml" xpointer="v217"/></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>-T</option></term>
+        <term><option>--exclude-identifier=<replaceable>SYSLOG_IDENTIFIER</replaceable></option></term>
+
+        <listitem><para>Exclude messages for the specified syslog identifier
+        <replaceable>SYSLOG_IDENTIFIER</replaceable>.</para>
+
+        <para>This parameter can be specified multiple times.</para>
+
+        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>-p</option></term>
         <term><option>--priority=</option></term>

shell-completion/bash/journalctl

@@ -46,9 +46,9 @@ _journalctl() {
                       --show-cursor --dmesg -k --pager-end -e -r --reverse
                       --utc -x --catalog --no-full --force --dump-catalog
                       --flush --rotate --sync --no-hostname -N --fields'
-        [ARG]='-b --boot -D --directory --file -F --field -t --identifier --facility
+        [ARG]='-b --boot -D --directory --file -F --field -t --identifier
-                      -M --machine -o --output -u --unit --user-unit -p --priority
+                      -T --exclude-identifier --facility -M --machine -o --output
-                      --root --case-sensitive'
+                      -u --unit --user-unit -p --priority --root --case-sensitive'
         [ARGUNKNOWN]='-c --cursor --interval -n --lines -S --since -U --until
                       --after-cursor --cursor-file --verify-key -g --grep
                       --vacuum-size --vacuum-time --vacuum-files --output-fields'
@@ -107,7 +107,7 @@ _journalctl() {
             --user-unit)
                 comps=$(journalctl -F '_SYSTEMD_USER_UNIT' 2>/dev/null)
                 ;;
-            --identifier|-t)
+            --identifier|-t|--exclude-identifier|-T)
                 comps=$(journalctl -F 'SYSLOG_IDENTIFIER' 2>/dev/null)
                 ;;
             --case-sensitive)

src/journal/journalctl.c

@@ -122,6 +122,7 @@ static bool arg_force = false;
 static usec_t arg_since = 0, arg_until = 0;
 static bool arg_since_set = false, arg_until_set = false;
 static char **arg_syslog_identifier = NULL;
+static char **arg_exclude_identifier = NULL;
 static char **arg_system_units = NULL;
 static char **arg_user_units = NULL;
 static const char *arg_field = NULL;
@@ -146,6 +147,7 @@ STATIC_DESTRUCTOR_REGISTER(arg_file, strv_freep);
 STATIC_DESTRUCTOR_REGISTER(arg_facilities, set_freep);
 STATIC_DESTRUCTOR_REGISTER(arg_verify_key, freep);
 STATIC_DESTRUCTOR_REGISTER(arg_syslog_identifier, strv_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_exclude_identifier, strv_freep);
 STATIC_DESTRUCTOR_REGISTER(arg_system_units, strv_freep);
 STATIC_DESTRUCTOR_REGISTER(arg_user_units, strv_freep);
 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
@@ -380,6 +382,8 @@ static int help(void) {
                "  -u --unit=UNIT             Show logs from the specified unit\n"
                "     --user-unit=UNIT        Show logs from the specified user unit\n"
                "  -t --identifier=STRING     Show entries with the specified syslog identifier\n"
+               "  -T --exclude-identifier=STRING\n"
+               "                             Hide entries with the specified syslog identifier\n"
                "  -p --priority=RANGE        Show entries with the specified priority\n"
                "     --facility=FACILITY...  Show entries with the specified facilities\n"
                "  -g --grep=PATTERN          Show entries with MESSAGE matching PATTERN\n"
@@ -519,6 +523,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "image-policy",         required_argument, NULL, ARG_IMAGE_POLICY         },
                 { "header",               no_argument,       NULL, ARG_HEADER               },
                 { "identifier",           required_argument, NULL, 't'                      },
+                { "exclude-identifier",   required_argument, NULL, 'T'                      },
                 { "priority",             required_argument, NULL, 'p'                      },
                 { "facility",             required_argument, NULL, ARG_FACILITY             },
                 { "grep",                 required_argument, NULL, 'g'                      },
@@ -564,7 +569,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "hefo:aln::qmb::kD:p:g:c:S:U:t:u:NF:xrM:i:", options, NULL)) >= 0)
+        while ((c = getopt_long(argc, argv, "hefo:aln::qmb::kD:p:g:c:S:U:t:T:u:NF:xrM:i:", options, NULL)) >= 0)
 
                 switch (c) {
 
@@ -958,6 +963,12 @@ static int parse_argv(int argc, char *argv[]) {
                                 return log_oom();
                         break;
 
+                case 'T':
+                        r = strv_extend(&arg_exclude_identifier, optarg);
+                        if (r < 0)
+                                return log_oom();
+                        break;
+
                 case 'u':
                         r = strv_extend(&arg_system_units, optarg);
                         if (r < 0)
@@ -1572,6 +1583,19 @@ static int add_syslog_identifier(sd_journal *j) {
         return 0;
 }
 
+static int add_exclude_identifier(sd_journal *j) {
+        _cleanup_set_free_ Set *excludes = NULL;
+        int r;
+
+        assert(j);
+
+        r = set_put_strdupv(&excludes, arg_exclude_identifier);
+        if (r < 0)
+                return r;
+
+        return set_free_and_replace(j->exclude_syslog_identifiers, excludes);
+}
+
 #if HAVE_GCRYPT
 static int format_journal_url(
                 const void *seed,
@@ -2408,6 +2432,10 @@ static int run(int argc, char *argv[]) {
         if (r < 0)
                 return log_error_errno(r, "Failed to add filter for syslog identifiers: %m");
 
+        r = add_exclude_identifier(j);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add exclude filter for syslog identifiers: %m");
+
         r = add_priorities(j);
         if (r < 0)
                 return r;

src/libsystemd/sd-journal/journal-internal.h

@@ -87,6 +87,7 @@ struct sd_journal {
         uint64_t current_field;
 
         Match *level0, *level1, *level2;
+        Set *exclude_syslog_identifiers;
 
         uint64_t origin_id;
 

src/libsystemd/sd-journal/sd-journal.c

@@ -2327,6 +2327,8 @@ _public_ void sd_journal_close(sd_journal *j) {
 
         hashmap_free_free(j->errors);
 
+        set_free(j->exclude_syslog_identifiers);
+
         free(j->path);
         free(j->prefix);
         free(j->namespace);

src/shared/logs-show.c

@@ -523,6 +523,9 @@ static int output_short(
                 return 0;
         }
 
+        if (identifier && set_contains(j->exclude_syslog_identifiers, identifier))
+                return 0;
+
         if (!(flags & OUTPUT_SHOW_ALL))
                 strip_tab_ansi(&message, &message_len, highlight_shifted);
 

test/testsuite-04.units/verbose-success.service

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Unit]
+Description=Verbose successful service
+
+[Service]
+ExecStart=/bin/echo success

test/units/testsuite-04.journal.sh

@@ -107,6 +107,15 @@ systemctl start silent-success
 journalctl --sync
 [[ -z "$(journalctl -b -q -u silent-success.service)" ]]
 
+# Test syslog identifiers exclusion
+systemctl start verbose-success
+journalctl --sync
+[[ -n "$(journalctl -b -q -u verbose-success.service -t systemd)" ]]
+[[ -n "$(journalctl -b -q -u verbose-success.service -t echo)" ]]
+[[ -n "$(journalctl -b -q -u verbose-success.service -T systemd)" ]]
+[[ -n "$(journalctl -b -q -u verbose-success.service -T echo)" ]]
+[[ -z "$(journalctl -b -q -u verbose-success.service -T echo -T '(echo)' -T systemd -T '(systemd)' -T systemd-executor)" ]]
+
 # Exercise the matching machinery
 SYSTEMD_LOG_LEVEL=debug journalctl -b -n 1 /dev/null /dev/zero /dev/null /dev/null /dev/null
 journalctl -b -n 1 /bin/true /bin/false