collect logs using a sudo script

docker logs can only be read by root

crashnotifier.js

@@ -7,53 +7,23 @@
 //         !! No console.log() allowed
 //         !! Do not set DEBUG
 
-var supervisor = require('supervisord-eventlistener'),
+var assert = require('assert'),
+    mailer = require('./src/mailer.js'),
     safe = require('safetydance'),
-    assert = require('assert'),
-    exec = require('child_process').exec,
-    util = require('util'),
-    mailer = require('./src/mailer.js');
+    supervisor = require('supervisord-eventlistener'),
+    path = require('path'),
+    util = require('util');
 
 var gLastNotifyTime = {};
 var gCooldownTime = 1000 * 60  * 5; // 5 min
+var COLLECT_LOGS_CMD = path.join(__dirname, 'src/scripts/collectlogs.sh');
 
 function collectLogs(program, callback) {
     assert.strictEqual(typeof program, 'string');
     assert.strictEqual(typeof callback, 'function');
 
-    var logFilePath = util.format('/var/log/supervisor/%s.log', program);
-
-    var boxLogData = safe.fs.readFileSync(logFilePath, 'utf-8');
-    if (boxLogData === null) return callback(safe.error);
-    var boxLogLines = boxLogData.split('\n').slice(-100);
-
-    var dockerLogPath = '/var/log/upstart/docker.log';
-
-    var dockerLogData = safe.fs.readFileSync(dockerLogPath, 'utf-8');
-    if (dockerLogData === null) return callback(safe.error);
-    var dockerLogLines = dockerLogData.split('\n').slice(-100);
-
-    exec('dmesg', function (error, stdout /*, stderr */) {
-        if (error) console.error(error);
-
-        var lines = stdout.split('\n');
-        var dmesgLogLines = lines.slice(-100);
-
-        var result = '';
-        result += program + '.log\n';
-        result += '-------------------------------------\n';
-        result += boxLogLines.join('\n');
-        result += '\n\n';
-        result += 'dmesg\n';
-        result += '-------------------------------------\n';
-        result += dmesgLogLines.join('\n');
-        result += '\n\n';
-        result += 'docker\n';
-        result += '-------------------------------------\n';
-        result += dockerLogLines.join('\n');
-
-        callback(null, result);
-    });
+    var logs = safe.child_process.execSync('sudo ' + COLLECT_LOGS_CMD + ' ' + program, { encoding: 'utf8' });
+    callback(null, logs);
 }
 
 supervisor.on('PROCESS_STATE_EXITED', function (headers, data) {

setup/container/sudoers

@@ -24,3 +24,6 @@ yellowtent ALL=(root) NOPASSWD: /home/yellowtent/box/src/scripts/reloadcollectd.
 
 Defaults!/home/yellowtent/box/src/scripts/backupswap.sh env_keep="HOME BOX_ENV"
 yellowtent ALL=(root) NOPASSWD: /home/yellowtent/box/src/scripts/backupswap.sh
+
+Defaults!/home/yellowtent/box/src/scripts/collectlogs.sh env_keep="HOME BOX_ENV"
+yellowtent ALL=(root) NOPASSWD: /home/yellowtent/box/src/scripts/collectlogs.sh

src/scripts/collectlogs.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+if [[ $EUID -ne 0 ]]; then
+    echo "This script should be run as root." >&2
+    exit 1
+fi
+
+if [[ $# == 1 && "$1" == "--check" ]]; then
+    echo "OK"
+    exit 0
+fi
+
+if [ $# -lt 1 ]; then
+    echo "Usage: collectlogs.sh <program>"
+    exit 1
+fi
+
+readonly program_name=$1
+
+echo "${program_name}.log"
+echo "-------------------"
+tail --lines=100 /var/log/supervisor/${program_name}.log
+echo
+echo
+echo "dmesg"
+echo "-----"
+dmesg | tail --lines=100
+echo
+echo
+echo "docker"
+echo "------"
+tail --lines=100 /var/log/upstart/docker.log
+echo
+echo
+
+
+

src/test/checkInstall

@@ -16,6 +16,7 @@ scripts=("${SOURCE_DIR}/scripts/rmappdir.sh" \
          "${SOURCE_DIR}/scripts/restoreapp.sh" \
          "${SOURCE_DIR}/scripts/reboot.sh" \
          "${SOURCE_DIR}/scripts/backupswap.sh" \
+         "${SOURCE_DIR}/scripts/collectlogs.sh" \
          "${SOURCE_DIR}/scripts/reloadcollectd.sh")
 
 for script in "${scripts[@]}"; do