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From a932c70a76846aa7dbb4b783291b44bfc8cbd76c Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Mon, 1 Feb 2016 09:25:22 +0100
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Subject: [PATCH] journalctl: show friendly info when using -b on runtime
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 journal only
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Make it clear that specifing boot when there is actually only one has no
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effect. This cosmetic patch improves user experience a bit.
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Cherry-picked from: 0f1a9a830c87d8accdc3a44d0a93ad343e52a7bd
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Resolves: #1082179
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---
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 src/journal/journalctl.c | 7 +++++++
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 1 file changed, 7 insertions(+)
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diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
c62b8e
index 964f849ee0..836d7d2141 100644
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--- a/src/journal/journalctl.c
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+++ b/src/journal/journalctl.c
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@@ -1905,6 +1905,13 @@ int main(int argc, char *argv[]) {
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                 goto finish;
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         }
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+        if (arg_boot_offset != 0 &&
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+            sd_journal_has_runtime_files(j) > 0 &&
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+            sd_journal_has_persistent_files(j) == 0) {
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+                log_info("Specifying boot ID has no effect, no persistent journal was found");
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+                r = 0;
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+                goto finish;
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+        }
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         /* add_boot() must be called first!
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          * It may need to seek the journal to find parent boot IDs. */
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         r = add_boot(j);