From: Lennart Poettering <lennart@poettering.net>
Date: Sun, 1 Jul 2012 16:47:40 +0000 (+0200)
Subject: journalctl: add new switch -b to show data from current boot only
X-Git-Tag: v186~25
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=59cea26a349cfa8db906b520dac72563dd773ff2

journalctl: add new switch -b to show data from current boot only
---

diff --git a/TODO b/TODO
index 1a7b60e23..b3aac5af3 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,3 @@
-Fedora 18:
-* chrony/ntp target?
-
 Bugfixes:
 * remove MS_SHARED from src/core/execute.c and src/test/test-ns.c. They are always combined
   with MS_REMOUNT, which currently does nothing in the kernel, but might which fail in the
@@ -52,9 +49,7 @@ Features:
 
 * new dependency type to "group" services in a target
 
-* add switch to journalctl to only show data from current boot
-
-* change REquires=basic.target to RequisiteOverride=basic.target
+* change Requires=basic.target to RequisiteOverride=basic.target
 
 * turn $NOTIFY_SOCKET back into an abstract namespace socket for
   compatibility with services which chroot()
diff --git a/man/journalctl.xml b/man/journalctl.xml
index d46a1648c..6254c5c68 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -209,6 +209,14 @@
                                 generated messages.</para></listitem>
                         </varlistentry>
 
+                        <varlistentry>
+                                <term><option>--this-boot</option></term>
+                                <term><option>-b</option></term>
+
+                                <listitem><para>Show data only from
+                                local boot.</para></listitem>
+                        </varlistentry>
+
                         <varlistentry>
                                 <term><option>--new-id128</option></term>
 
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index e9d918a73..6929b7601 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -49,6 +49,7 @@ static bool arg_no_tail = false;
 static bool arg_new_id128 = false;
 static bool arg_quiet = false;
 static bool arg_local = false;
+static bool arg_this_boot = false;
 
 static int help(void) {
 
@@ -64,8 +65,9 @@ static int help(void) {
                "  -o --output=STRING  Change journal output mode (short, short-monotonic,\n"
                "                      verbose, export, json, cat)\n"
                "  -q --quiet          Don't show privilege warning\n"
-               "     --new-id128      Generate a new 128 Bit id\n"
-               "  -l --local          Only local entries\n",
+               "  -l --local          Only local entries\n"
+               "  -b --this-boot      Show data only from current boot\n"
+               "     --new-id128      Generate a new 128 Bit id\n",
                program_invocation_short_name);
 
         return 0;
@@ -92,6 +94,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "new-id128", no_argument,       NULL, ARG_NEW_ID128 },
                 { "quiet",     no_argument,       NULL, 'q'           },
                 { "local",     no_argument,       NULL, 'l'           },
+                { "this-boot", no_argument,       NULL, 'b'           },
                 { NULL,        0,                 NULL, 0             }
         };
 
@@ -100,7 +103,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "hfo:an:ql", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "hfo:an:qlb", options, NULL)) >= 0) {
 
                 switch (c) {
 
@@ -159,6 +162,10 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_local = true;
                         break;
 
+                case 'b':
+                        arg_this_boot = true;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -232,6 +239,25 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
+        if (arg_this_boot) {
+                char match[9+32+1] = "_BOOT_ID=";
+                sd_id128_t boot_id;
+
+                r = sd_id128_get_boot(&boot_id);
+                if (r < 0) {
+                        log_error("Failed to get boot id: %s", strerror(-r));
+                        goto finish;
+                }
+
+                sd_id128_to_string(boot_id, match + 9);
+
+                r = sd_journal_add_match(j, match, strlen(match));
+                if (r < 0) {
+                        log_error("Failed to add match: %s", strerror(-r));
+                        goto finish;
+                }
+        }
+
         for (i = optind; i < argc; i++) {
                 if (path_is_absolute(argv[i])) {
                         char *p = NULL;