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From c5af9aa2ccab078cf6f5bf68b88a3defa2f768f8 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sat, 13 May 2017 16:40:09 -0400
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Subject: [PATCH] shared/logs-show: avoid printing "(null)" when timestamp is
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 not specified
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$ perl -e 'print("MESSAGE\n", pack("q<", 1), "A\n\nMESSAGE=test2\n")' > message.bin
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$ systemd-journal-remote -o /tmp/out.journal message.bin
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$ journalctl -o export --file /tmp/out.journal
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__CURSOR=s=b16c464c2db44384b29e75a564d8388e;i=1;b=6b0be47627bd4932913dc126012c21c0;m=0;t=0;x=b04263a253e357a
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__REALTIME_TIMESTAMP=0
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__MONOTONIC_TIMESTAMP=0
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_BOOT_ID=6b0be47627bd4932913dc126012c21c0
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MESSAGE=A
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$ journalctl -o verbose --file /tmp/out.journal
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(null) [s=b16c464c2db44384b29e75a564d8388e;i=1;b=6b0be47627bd4932913dc126012c21c0;m=0;t=0;x=b04263a253e357a]
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    MESSAGE=A
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This is changed to
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$ build/journalctl -o verbose --file /tmp/out.journal
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(no timestamp) [s=b16c464c2db44384b29e75a564d8388e;i=1;b=6b0be47627bd4932913dc126012c21c0;m=0;t=0;x=b04263a253e357a]
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    MESSAGE=A
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We should deal gracefully with unexpected input.
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(cherry picked from commit 8924973ae2e1f0a0c131dcec0578669dc26e5e26)
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---
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 src/shared/logs-show.c | 7 ++++---
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 1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/src/shared/logs-show.c b/src/shared/logs-show.c
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index 72c43e80cb..b4c72215c4 100644
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--- a/src/shared/logs-show.c
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+++ b/src/shared/logs-show.c
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@@ -473,6 +473,7 @@ static int output_verbose(
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         _cleanup_free_ char *cursor = NULL;
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         uint64_t realtime = 0;
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         char ts[FORMAT_TIMESTAMP_MAX + 7];
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+        const char *timestamp;
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         int r;
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         assert(f);
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@@ -508,10 +509,10 @@ static int output_verbose(
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         if (r < 0)
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                 return log_error_errno(r, "Failed to get cursor: %m");
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+        timestamp = flags & OUTPUT_UTC ? format_timestamp_us_utc(ts, sizeof ts, realtime)
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+                                       : format_timestamp_us(ts, sizeof ts, realtime);
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         fprintf(f, "%s [%s]\n",
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-                flags & OUTPUT_UTC ?
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-                format_timestamp_us_utc(ts, sizeof(ts), realtime) :
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-                format_timestamp_us(ts, sizeof(ts), realtime),
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+                timestamp ?: "(no timestamp)",
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                 cursor);
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         JOURNAL_FOREACH_DATA_RETVAL(j, data, length, r) {