From 8f14c8327b1c2b578bbf1235723a77931c3d0223 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 27 Sep 2012 23:25:23 +0200
Subject: [PATCH] journalctl: add --cursor switch

---
 man/journalctl.xml       |  9 +++++++++
 src/journal/journalctl.c | 21 +++++++++++++++++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/man/journalctl.xml b/man/journalctl.xml
index 50c915d59..651a8a56a 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -254,6 +254,15 @@
                                 current boot.</para></listitem>
                         </varlistentry>
 
+                        <varlistentry>
+                                <term><option>--cursor=</option></term>
+                                <term><option>-c</option></term>
+
+                                <listitem><para>Jump to the location
+                                in the journal specified by the passed
+                                cursor.</para></listitem>
+                        </varlistentry>
+
                         <varlistentry>
                                 <term><option>--directory=</option></term>
                                 <term><option>-D</option></term>
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 62bdcb7c6..bac872949 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -63,6 +63,7 @@ static bool arg_no_tail = false;
 static bool arg_quiet = false;
 static bool arg_merge = false;
 static bool arg_this_boot = false;
+static const char *arg_cursor = NULL;
 static const char *arg_directory = NULL;
 static int arg_priorities = 0xFF;
 static const char *arg_verify_key = NULL;
@@ -87,6 +88,7 @@ static int help(void) {
                "     --version           Show package version\n"
                "     --no-pager          Do not pipe output into a pager\n"
                "  -a --all               Show all fields, including long and unprintable\n"
+               "  -c --cursor=CURSOR     Jump to the specified cursor\n"
                "  -f --follow            Follow journal\n"
                "  -n --lines[=INTEGER]   Number of journal entries to show\n"
                "     --no-tail           Show all lines, even in follow mode\n"
@@ -148,6 +150,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "verify",       no_argument,       NULL, ARG_VERIFY       },
                 { "verify-key",   required_argument, NULL, ARG_VERIFY_KEY   },
                 { "disk-usage",   no_argument,       NULL, ARG_DISK_USAGE   },
+                { "cursor",       no_argument,       NULL, 'c'              },
                 { NULL,           0,                 NULL, 0                }
         };
 
@@ -156,7 +159,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:c:", options, NULL)) >= 0) {
 
                 switch (c) {
 
@@ -228,6 +231,10 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_directory = optarg;
                         break;
 
+                case 'c':
+                        arg_cursor = optarg;
+                        break;
+
                 case ARG_HEADER:
                         arg_action = ACTION_PRINT_HEADER;
                         break;
@@ -829,7 +836,16 @@ int main(int argc, char *argv[]) {
                 }
         }
 
-        if (arg_lines >= 0) {
+        if (arg_cursor) {
+                r = sd_journal_seek_cursor(j, arg_cursor);
+                if (r < 0) {
+                        log_error("Failed to seek to cursor: %s", strerror(-r));
+                        goto finish;
+                }
+
+                r = sd_journal_next(j);
+
+        } else if (arg_lines >= 0) {
                 r = sd_journal_seek_tail(j);
                 if (r < 0) {
                         log_error("Failed to seek to tail: %s", strerror(-r));
@@ -837,6 +853,7 @@ int main(int argc, char *argv[]) {
                 }
 
                 r = sd_journal_previous_skip(j, arg_lines);
+
         } else {
                 r = sd_journal_seek_head(j);
                 if (r < 0) {
-- 
2.30.2