apt-log-split.php

<?php
/**
 *
 * This script extracts the most recent packages updates from a debian server
 * by parsing the /var/log/apt/history.log file.
 * It creates a new log file whose location can be provided as a shell parameter 
 *
 */

####      ####
## UTILITIES #
####      ####

/**
 * Simple version number extractor
 * @param $version_string string 
 * @return array
 **/
function versionStruct( $version_string ){
    preg_match("/(\d+)\.(\d+)\.(.*)/",$version_string,$matches);
    $return = array();
    $return["major"] = $matches[1];
    $return["minor"] = $matches[2];
    $return["details"] = $matches[3];
    return $return;
}

/**
 * Simple panic function
 */
function panic( $message ){
    echo $message;
    exit(1);
}

####         #####
# BUSINESS LOGIC #
####         #####

// It should attempt to read the history file
$logFile= file("/var/log/apt/history.log");
if( ! $logFile ) {
    panic( "No result" );
}

// It should attempt to find a valid upgrade log line
$line_count = count( $logFile ) ;
for( $i = $line_count - 1; $i > $line_count - 5 ; $i-- ){

    $res = strpos( $logFile[$i], "Upgrade:" );
    if( strpos( $logFile[$i], "Upgrade:" ) !== FALSE ){
        $line= $logFile[$i];
        break;
    }
}
if( ! isset($line) ){
    panic ("Broken file, could not find an upgrade line");
}

$result = array();

// It should read package name, old, new version occurences
preg_match_all("/ (\S+) \((\S+), (\S+)\),/",$line,$matches);

// It should store packages infos 
foreach( $matches[1] as $index => $package ){
    $before = $matches[2][$index];
    $after = $matches[3][$index];
    // It should detect important version changes
    $beforeStruct = versionStruct( $before );
    $afterStruct = versionStruct( $after );
    $packageInfo = array( "before" => $before, "after" => $after );
    if( $beforeStruct["major"] != $afterStruct["major"] 
        || $beforeStruct["minor"] != $afterStruct["minor"]
    ){
        $packageInfo["notify"] = true;
    }
    $result[ $package ] = $packageInfo;       
}

$output_file = count( $argv ) > 1 ? $argv[1] : "/infra/data/packages/".gethostname()."/".date("Ymd-His").".json"; 
$output_dir = dirname( $output_file);
if( ! is_dir( $output_dir ) ) {
    if( ! mkdir( $output_dir, true ) ) {
        panic( "failed to create $output_dir");
    }
}

if( ! touch ( $output_file ) ){
    panic ( "failed to create $output_file");
}


if( ! file_put_contents( $output_file, json_encode($result)) ){
    panic ( "failed to copy content to $output_file");
}