Merge pull request #28697 from 1awesomeJ/new_bsod

systemd-bsod: Add "--continuous" option

2 files changed, 35 insertions, 16 deletions

diff --git a/src/journal/bsod.c b/src/journal/bsod.c
index 2ae06dee52..76907d2e5c 100644
--- a/src/journal/bsod.c
+++ b/src/journal/bsod.c
@@ -22,6 +22,8 @@
 #include "sysctl-util.h"
 #include "terminal-util.h"
 
+static bool arg_continuous = false;
+
 static int help(void) {
         _cleanup_free_ char *link = NULL;
         int r;
@@ -36,6 +38,8 @@ static int help(void) {
                "as a string and a QR code.\n\n%s"
                "   -h --help            Show this help\n"
                "      --version         Show package version\n"
+               "   -c --continuous      Make systemd-bsod wait continuously\n"
+               "for changes in the journal\n"
                "\nSee the %s for details.\n",
                program_invocation_short_name,
                ansi_highlight(),
@@ -75,13 +79,24 @@ static int acquire_first_emergency_log_message(char **ret) {
         if (r < 0)
                 return log_error_errno(r, "Failed to seek to start of jornal: %m");
 
-        r = sd_journal_next(j);
-        if (r < 0)
-                return log_error_errno(r, "Failed to read next journal entry: %m");
-        if (r == 0) {
-                log_debug("No emergency level entries in the journal");
-                *ret = NULL;
-                return 0;
+        for(;;) {
+                r = sd_journal_next(j);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to read next journal entry: %m");
+                if (r > 0)
+                        break;
+
+                if (!arg_continuous) {
+                        log_debug("No emergency level entries in the journal");
+                        *ret = NULL;
+                        return 0;
+                }
+
+                r = sd_journal_wait(j, (uint64_t) -1);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to wait for changes: %m");
+
+                continue;
         }
 
         r = sd_journal_get_data(j, "MESSAGE", &d, &l);
@@ -210,6 +225,7 @@ static int parse_argv(int argc, char * argv[]) {
         static const struct option options[] = {
                 { "help",    no_argument, NULL, 'h'         },
                 { "version", no_argument, NULL, ARG_VERSION },
+                { "continuous",    no_argument, NULL, 'c'   },
                 {}
         };
 
@@ -218,7 +234,7 @@ static int parse_argv(int argc, char * argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+        while ((c = getopt_long(argc, argv, "hc", options, NULL)) >= 0)
 
                 switch (c) {
 
@@ -228,6 +244,10 @@ static int parse_argv(int argc, char * argv[]) {
                 case ARG_VERSION:
                         return version();
 
+                case 'c':
+                        arg_continuous = true;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
diff --git a/src/journal/meson.build b/src/journal/meson.build
index e89f9d1bc5..32d73cca82 100644
--- a/src/journal/meson.build
+++ b/src/journal/meson.build
@@ -72,6 +72,13 @@ executables += [
                         threads,
                 ],
         },
+        libexec_template + {
+                'name' : 'systemd-bsod',
+                'conditions' : ['HAVE_QRENCODE'],
+                'sources' : files('bsod.c'),
+                'link_with' : libshared,
+                'dependencies' : libqrencode,
+        },
         executable_template + {
                 'name' : 'systemd-cat',
                 'public' : true,
@@ -95,14 +102,6 @@ executables += [
                         threads,
                 ],
         },
-        executable_template + {
-                'name' : 'systemd-bsod',
-                'conditions' : ['HAVE_QRENCODE'],
-                'public' : true,
-                'sources' : files('bsod.c'),
-                'link_with' : libshared,
-                'dependencies' : libqrencode,
-        },
         journal_test_template + {
                 'sources' : files('test-journal-append.c'),
                 'type' : 'manual',