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Fix journal-gatewayd returning duplicated lines when following logs (#4124)

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When following logs in Home Assitant frontend, the last line may be duplicated
over time when no new lines are added. This is because systemd-journal-gatewayd
incorrectly processed the num_skip part of the Range header, always returning
the last entry even when it should have been skipped.

Backport the patch for Systemd that processes the header correctly.

Fixes #4101
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Jan Čermák 2025-06-26 12:10:44 +02:00 committed by GitHub
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commit 4a4da64f31
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buildroot-external/patches/systemd/0006-journal-gatewayd-fix-handling-of-num_skip-pointing-b.patch Normal file
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From 56e744bc45713ef7575032cfdb20073013ec0a8d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <sairon@sairon.cz>
Date: Tue, 24 Jun 2025 18:54:44 +0200
Subject: [PATCH] journal-gatewayd: fix handling of num_skip pointing beyond
the last entry
When `num_skip` is supplied to the `Range` header, journal-gatewayd
always returns the very last record even though it should have been
skipped. This is because the `sd_journal_next_skip` always returns
non-zero value on the first call, leading to one iteration of the
`request_reader_entries` returning the last record.
To avoid this unexpected behavior, check that the number of lines we
have skipped by is not lower than the requested skip value. If it is,
then it means there are lines which should not be returned now -
decrement the n_skip counter then and return from the function, closing
the stream if follow flag is not set.
Fixes #37954
---
(Backported for v256.x)
Signed-off-by: Jan Čermák <sairon@sairon.cz>
Upstream: https://github.com/systemd/systemd/pull/37955
---
src/journal-remote/journal-gatewayd.c | 16 ++++++++++++++--
test/units/TEST-04-JOURNAL.journal-gatewayd.sh | 6 ++++++
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/src/journal-remote/journal-gatewayd.c b/src/journal-remote/journal-gatewayd.c
index 0661ecb1cf..5bce48d485 100644
--- a/src/journal-remote/journal-gatewayd.c
+++ b/src/journal-remote/journal-gatewayd.c
@@ -181,9 +181,21 @@ static ssize_t request_reader_entries(
if (m->n_skip < 0)
r = sd_journal_previous_skip(m->journal, (uint64_t) -m->n_skip + 1);
- else if (m->n_skip > 0)
+ else if (m->n_skip > 0) {
r = sd_journal_next_skip(m->journal, (uint64_t) m->n_skip + 1);
- else
+ if (r < 0) {
+ log_error_errno(r, "Failed to skip journal entries: %m");
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ }
+ /* We skipped beyond the end, make sure entries between the cursor and n_skip offset
+ * from it are not returned. */
+ if (r < m->n_skip + 1) {
+ m->n_skip -= r;
+ if (m->follow)
+ return 0;
+ return MHD_CONTENT_READER_END_OF_STREAM;
+ }
+ } else
r = sd_journal_next(m->journal);
if (r < 0) {
diff --git a/test/units/TEST-04-JOURNAL.journal-gatewayd.sh b/test/units/TEST-04-JOURNAL.journal-gatewayd.sh
index ef85dc17c6..b6dc860b63 100755
--- a/test/units/TEST-04-JOURNAL.journal-gatewayd.sh
+++ b/test/units/TEST-04-JOURNAL.journal-gatewayd.sh
@@ -82,6 +82,12 @@ timeout 5 curl -LSfs \
--header "Range: entries=:-20:10" \
http://localhost:19531/entries?follow >"$LOG_FILE"
jq -se "length == 10" "$LOG_FILE"
+# Test positive skip beyond the last entry
+curl -LSfs \
+ --header "Accept: application/json" \
+ --header "Range: entries=$TEST_CURSOR:1:1" \
+ http://localhost:19531/entries?SYSLOG_IDENTIFIER="$TEST_TAG" >"$LOG_FILE"
+jq -se "length == 0" "$LOG_FILE"
# Check if the specified cursor refers to an existing entry and return just that entry
curl -LSfs \
--header "Accept: application/json" \