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<?php
/**
* A class to help return information about a git repo MediaWiki may be inside
* This is used by Special:Version and is also useful for the LocalSettings.php
* of anyone working on large branches in git to setup config that show up only
* when specific branches are currently checked out.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
class GitInfo {
/**
* Singleton for the repo at $IP
*/
protected static $repo = null;
/**
* Location of the .git directory
*/
protected $basedir;
/**
* Map of repo URLs to viewer URLs. Access via static method getViewers().
*/
private static $viewers = false;
/**
* @param string $dir The root directory of the repo where the .git dir can be found
*/
public function __construct( $dir ) {
$this->basedir = "{$dir}/.git";
if ( is_readable( $this->basedir ) && !is_dir( $this->basedir ) ) {
$GITfile = file_get_contents( $this->basedir );
if ( strlen( $GITfile ) > 8 && substr( $GITfile, 0, 8 ) === 'gitdir: ' ) {
$path = rtrim( substr( $GITfile, 8 ), "\r\n" );
$isAbsolute = $path[0] === '/' || substr( $path, 1, 1 ) === ':';
$this->basedir = $isAbsolute ? $path : "{$dir}/{$path}";
}
}
}
/**
* Return a singleton for the repo at $IP
* @return GitInfo
*/
public static function repo() {
global $IP;
if ( is_null( self::$repo ) ) {
self::$repo = new self( $IP );
}
return self::$repo;
}
/**
* Check if a string looks like a hex encoded SHA1 hash
*
* @param string $str The string to check
* @return bool Whether or not the string looks like a SHA1
*/
public static function isSHA1( $str ) {
return !!preg_match( '/^[0-9A-F]{40}$/i', $str );
}
/**
* Return the HEAD of the repo (without any opening "ref: ")
* @return string The HEAD
*/
public function getHead() {
$HEADfile = "{$this->basedir}/HEAD";
if ( !is_readable( $HEADfile ) ) {
return false;
}
$HEAD = file_get_contents( $HEADfile );
if ( preg_match( "/ref: (.*)/", $HEAD, $m ) ) {
return rtrim( $m[1] );
} else {
return rtrim( $HEAD );
}
}
/**
* Return the SHA1 for the current HEAD of the repo
* @return string A SHA1 or false
*/
public function getHeadSHA1() {
$HEAD = $this->getHead();
// If detached HEAD may be a SHA1
if ( self::isSHA1( $HEAD ) ) {
return $HEAD;
}
// If not a SHA1 it may be a ref:
$REFfile = "{$this->basedir}/{$HEAD}";
if ( !is_readable( $REFfile ) ) {
return false;
}
$sha1 = rtrim( file_get_contents( $REFfile ) );
return $sha1;
}
/**
* Return the name of the current branch, or HEAD if not found
* @return string The branch name, HEAD, or false
*/
public function getCurrentBranch() {
$HEAD = $this->getHead();
if ( $HEAD && preg_match( "#^refs/heads/(.*)$#", $HEAD, $m ) ) {
return $m[1];
} else {
return $HEAD;
}
}
/**
* Get an URL to a web viewer link to the HEAD revision.
*
* @return string|bool string if an URL is available or false otherwise.
*/
public function getHeadViewUrl() {
$config = "{$this->basedir}/config";
if ( !is_readable( $config ) ) {
return false;
}
$configArray = parse_ini_file( $config, true );
$remote = false;
// Use the "origin" remote repo if available or any other repo if not.
if ( isset( $configArray['remote origin'] ) ) {
$remote = $configArray['remote origin'];
} else {
foreach( $configArray as $sectionName => $sectionConf ) {
if ( substr( $sectionName, 0, 6 ) == 'remote' ) {
$remote = $sectionConf;
}
}
}
if ( $remote === false || !isset( $remote['url'] ) ) {
return false;
}
$url = $remote['url'];
if ( substr( $url, -4 ) !== '.git' ) {
$url .= '.git';
}
foreach( self::getViewers() as $repo => $viewer ) {
$pattern = '#^' . $repo . '$#';
if ( preg_match( $pattern, $url ) ) {
$viewerUrl = preg_replace( $pattern, $viewer, $url );
$headSHA1 = $this->getHeadSHA1();
$replacements = array(
'%h' => substr( $headSHA1, 0, 7 ),
'%H' => $headSHA1
);
return strtr( $viewerUrl, $replacements );
}
}
return false;
}
/**
* @see self::getHeadSHA1
* @return string
*/
public static function headSHA1() {
return self::repo()->getHeadSHA1();
}
/**
* @see self::getCurrentBranch
* @return string
*/
public static function currentBranch() {
return self::repo()->getCurrentBranch();
}
/**
* @see self::getHeadViewUrl()
* @return bool|string
*/
public static function headViewUrl() {
return self::repo()->getHeadViewUrl();
}
/**
* Gets the list of repository viewers
* @return array
*/
protected static function getViewers() {
global $wgGitRepositoryViewers;
if( self::$viewers === false ) {
self::$viewers = $wgGitRepositoryViewers;
wfRunHooks( 'GitViewers', array( &self::$viewers ) );
}
return self::$viewers;
}
}
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