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From b14c82dd9f9fcc42810614cf02efe8651897d36f Mon Sep 17 00:00:00 2001
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From: Daan De Meyer <daan.j.demeyer@gmail.com>
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Date: Wed, 10 Jun 2020 20:19:41 +0200
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Subject: [PATCH] log: Prefer logging to CLI unless JOURNAL_STREAM is set
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(cherry picked from commit bc694c06e60505efeb09e5278a7b22cdfa23975e)
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Resolves: #1865840
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---
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 src/basic/log.c               | 32 +++++++++++++++++++++++++++++---
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 test/TEST-21-SYSUSERS/test.sh |  3 +--
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 2 files changed, 30 insertions(+), 5 deletions(-)
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diff --git a/src/basic/log.c b/src/basic/log.c
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index 48c094b548..9387e56a57 100644
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--- a/src/basic/log.c
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+++ b/src/basic/log.c
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@@ -10,6 +10,7 @@
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 #include <string.h>
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 #include <sys/signalfd.h>
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 #include <sys/socket.h>
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+#include <sys/stat.h>
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 #include <sys/time.h>
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 #include <sys/uio.h>
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 #include <sys/un.h>
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@@ -19,6 +20,7 @@
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 #include "sd-messages.h"
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 #include "alloc-util.h"
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+#include "extract-word.h"
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 #include "fd-util.h"
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 #include "format-util.h"
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 #include "io-util.h"
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@@ -220,6 +222,32 @@ fail:
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         return r;
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 }
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+static bool stderr_is_journal(void) {
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+        _cleanup_free_ char *w = NULL;
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+        const char *e;
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+        uint64_t dev, ino;
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+        struct stat st;
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+
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+        e = getenv("JOURNAL_STREAM");
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+        if (!e)
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+                return false;
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+
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+        if (extract_first_word(&e, &w, ":", EXTRACT_DONT_COALESCE_SEPARATORS) <= 0)
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+                return false;
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+        if (!e)
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+                return false;
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+
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+        if (safe_atou64(w, &dev) < 0)
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+                return false;
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+        if (safe_atou64(e, &ino) < 0)
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+                return false;
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+
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+        if (fstat(STDERR_FILENO, &st) < 0)
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+                return false;
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+
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+        return st.st_dev == dev && st.st_ino == ino;
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+}
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+
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 int log_open(void) {
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         int r;
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@@ -239,9 +267,7 @@ int log_open(void) {
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                 return 0;
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         }
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-        if (log_target != LOG_TARGET_AUTO ||
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-            getpid_cached() == 1 ||
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-            isatty(STDERR_FILENO) <= 0) {
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+        if (log_target != LOG_TARGET_AUTO || getpid_cached() == 1 || stderr_is_journal()) {
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                 if (!prohibit_ipc &&
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                     IN_SET(log_target, LOG_TARGET_AUTO,
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diff --git a/test/TEST-21-SYSUSERS/test.sh b/test/TEST-21-SYSUSERS/test.sh
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index b1049e720d..3460d71f22 100755
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--- a/test/TEST-21-SYSUSERS/test.sh
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+++ b/test/TEST-21-SYSUSERS/test.sh
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@@ -108,8 +108,7 @@ test_run() {
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                 echo "*** Running test $f"
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                 prepare_testdir ${f%.input}
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                 cp $f $TESTDIR/usr/lib/sysusers.d/test.conf
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-                systemd-sysusers --root=$TESTDIR 2> /dev/null
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-                journalctl -t systemd-sysusers -o cat | tail -n1 > $TESTDIR/tmp/err
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+                systemd-sysusers --root=$TESTDIR 2>&1 | tail -n1 > $TESTDIR/tmp/err
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                 if ! diff -u $TESTDIR/tmp/err  ${f%.*}.expected-err; then
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                         echo "**** Unexpected error output for $f"
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                         cat $TESTDIR/tmp/err