test: add test case that journal file is created with the requested compression algorithm

test/units/testsuite-04.sh

@@ -290,4 +290,36 @@ rm -rf "$JTMP"
 
 rm /tmp/lb1
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=2183546
+mkdir /run/systemd/system/systemd-journald.service.d
+MID=$(cat /etc/machine-id)
+for c in "NONE" "XZ" "LZ4" "ZSTD"; do
+    cat >/run/systemd/system/systemd-journald.service.d/compress.conf <<EOF
+[Service]
+Environment=SYSTEMD_JOURNAL_COMPRESS=${c}
+EOF
+    systemctl daemon-reload
+    systemctl restart systemd-journald.service
+    journalctl --rotate
+
+    ID=$(systemd-id128 new)
+    systemd-cat -t "$ID" /bin/bash -c "for ((i=0;i<100;i++)); do echo -n hoge with ${c}; done; echo"
+    journalctl --sync
+    timeout 10 bash -c "while ! SYSTEMD_LOG_LEVEL=debug journalctl --verify --quiet --file /var/log/journal/$MID/system.journal 2>&1 | grep -q -F 'compress=${c}'; do sleep .5; done"
+
+    # $SYSTEMD_JOURNAL_COMPRESS= also works for journal-remote
+    if [[ -x /usr/lib/systemd/systemd-journal-remote ]]; then
+        for cc in "NONE" "XZ" "LZ4" "ZSTD"; do
+            rm -f /tmp/foo.journal
+            SYSTEMD_JOURNAL_COMPRESS="${cc}" /usr/lib/systemd/systemd-journal-remote --split-mode=none -o /tmp/foo.journal --getter="journalctl -b -o export -t $ID"
+            SYSTEMD_LOG_LEVEL=debug journalctl --verify --quiet --file /tmp/foo.journal 2>&1 | grep -q -F "compress=${cc}"
+            journalctl -t "$ID" -o cat --file /tmp/foo.journal | grep -q -F "hoge with ${c}"
+        done
+    fi
+done
+rm /run/systemd/system/systemd-journald.service.d/compress.conf
+systemctl daemon-reload
+systemctl restart systemd-journald.service
+journalctl --rotate
+
 touch /testok