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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;
/**
* Path to JSON cache file for pre-computed git information.
*/
protected $cacheFile;
/**
* Cached git information.
*/
protected $cache = [];
/**
* Map of repo URLs to viewer URLs. Access via static method getViewers().
*/
private static $viewers = false;
/**
* @param string $repoDir The root directory of the repo where .git can be found
* @param bool $usePrecomputed Use precomputed information if available
* @see precomputeValues
*/
public function __construct( $repoDir, $usePrecomputed = true ) {
$this->cacheFile = self::getCacheFilePath( $repoDir );
wfDebugLog( 'gitinfo',
"Computed cacheFile={$this->cacheFile} for {$repoDir}"
);
if ( $usePrecomputed &&
$this->cacheFile !== null &&
is_readable( $this->cacheFile )
) {
$this->cache = FormatJson::decode(
file_get_contents( $this->cacheFile ),
true
);
wfDebugLog( 'gitinfo', "Loaded git data from cache for {$repoDir}" );
}
if ( !$this->cacheIsComplete() ) {
wfDebugLog( 'gitinfo', "Cache incomplete for {$repoDir}" );
$this->basedir = $repoDir . DIRECTORY_SEPARATOR . '.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" );
if ( $path[0] === '/' || substr( $path, 1, 1 ) === ':' ) {
// Path from GITfile is absolute
$this->basedir = $path;
} else {
$this->basedir = $repoDir . DIRECTORY_SEPARATOR . $path;
}
}
}
}
}
/**
* Compute the path to the cache file for a given directory.
*
* @param string $repoDir The root directory of the repo where .git can be found
* @return string Path to GitInfo cache file in $wgGitInfoCacheDirectory or
* fallback in the extension directory itself
* @since 1.24
*/
protected static function getCacheFilePath( $repoDir ) {
global $IP, $wgGitInfoCacheDirectory;
if ( $wgGitInfoCacheDirectory ) {
// Convert both $IP and $repoDir to canonical paths to protect against
// $IP having changed between the settings files and runtime.
$realIP = realpath( $IP );
$repoName = realpath( $repoDir );
if ( $repoName === false ) {
// Unit tests use fake path names
$repoName = $repoDir;
}
if ( strpos( $repoName, $realIP ) === 0 ) {
// Strip $IP from path
$repoName = substr( $repoName, strlen( $realIP ) );
}
// Transform path to git repo to something we can safely embed in
// a filename
$repoName = strtr( $repoName, DIRECTORY_SEPARATOR, '-' );
$fileName = 'info' . $repoName . '.json';
$cachePath = "{$wgGitInfoCacheDirectory}/{$fileName}";
if ( is_readable( $cachePath ) ) {
return $cachePath;
}
}
return "$repoDir/gitinfo.json";
}
/**
* Get the singleton for the repo at $IP
*
* @return GitInfo
*/
public static function repo() {
if ( is_null( self::$repo ) ) {
global $IP;
self::$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 );
}
/**
* Get the HEAD of the repo (without any opening "ref: ")
*
* @return string|bool The HEAD (git reference or SHA1) or false
*/
public function getHead() {
if ( !isset( $this->cache['head'] ) ) {
$headFile = "{$this->basedir}/HEAD";
$head = false;
if ( is_readable( $headFile ) ) {
$head = file_get_contents( $headFile );
if ( preg_match( "/ref: (.*)/", $head, $m ) ) {
$head = rtrim( $m[1] );
} else {
$head = rtrim( $head );
}
}
$this->cache['head'] = $head;
}
return $this->cache['head'];
}
/**
* Get the SHA1 for the current HEAD of the repo
*
* @return string|bool A SHA1 or false
*/
public function getHeadSHA1() {
if ( !isset( $this->cache['headSHA1'] ) ) {
$head = $this->getHead();
$sha1 = false;
// If detached HEAD may be a SHA1
if ( self::isSHA1( $head ) ) {
$sha1 = $head;
} else {
// If not a SHA1 it may be a ref:
$refFile = "{$this->basedir}/{$head}";
if ( is_readable( $refFile ) ) {
$sha1 = rtrim( file_get_contents( $refFile ) );
}
}
$this->cache['headSHA1'] = $sha1;
}
return $this->cache['headSHA1'];
}
/**
* Get the commit date of HEAD entry of the git code repository
*
* @since 1.22
* @return int|bool Commit date (UNIX timestamp) or false
*/
public function getHeadCommitDate() {
global $wgGitBin;
if ( !isset( $this->cache['headCommitDate'] ) ) {
$date = false;
if ( is_file( $wgGitBin ) &&
is_executable( $wgGitBin ) &&
$this->getHead() !== false
) {
$environment = [ "GIT_DIR" => $this->basedir ];
$cmd = wfEscapeShellArg( $wgGitBin ) .
" show -s --format=format:%ct HEAD";
$retc = false;
$commitDate = wfShellExec( $cmd, $retc, $environment );
if ( $retc === 0 ) {
$date = (int)$commitDate;
}
}
$this->cache['headCommitDate'] = $date;
}
return $this->cache['headCommitDate'];
}
/**
* Get the name of the current branch, or HEAD if not found
*
* @return string|bool The branch name, HEAD, or false
*/
public function getCurrentBranch() {
if ( !isset( $this->cache['branch'] ) ) {
$branch = $this->getHead();
if ( $branch &&
preg_match( "#^refs/heads/(.*)$#", $branch, $m )
) {
$branch = $m[1];
}
$this->cache['branch'] = $branch;
}
return $this->cache['branch'];
}
/**
* Get an URL to a web viewer link to the HEAD revision.
*
* @return string|bool String if a URL is available or false otherwise
*/
public function getHeadViewUrl() {
$url = $this->getRemoteUrl();
if ( $url === false ) {
return false;
}
foreach ( self::getViewers() as $repo => $viewer ) {
$pattern = '#^' . $repo . '$#';
if ( preg_match( $pattern, $url, $matches ) ) {
$viewerUrl = preg_replace( $pattern, $viewer, $url );
$headSHA1 = $this->getHeadSHA1();
$replacements = [
'%h' => substr( $headSHA1, 0, 7 ),
'%H' => $headSHA1,
'%r' => urlencode( $matches[1] ),
'%R' => $matches[1],
];
return strtr( $viewerUrl, $replacements );
}
}
return false;
}
/**
* Get the URL of the remote origin.
* @return string|bool String if a URL is available or false otherwise.
*/
protected function getRemoteUrl() {
if ( !isset( $this->cache['remoteURL'] ) ) {
$config = "{$this->basedir}/config";
$url = false;
if ( is_readable( $config ) ) {
MediaWiki\suppressWarnings();
$configArray = parse_ini_file( $config, true );
MediaWiki\restoreWarnings();
$remote = false;
// Use the "origin" remote repo if available or any other repo if not.
if ( isset( $configArray['remote origin'] ) ) {
$remote = $configArray['remote origin'];
} elseif ( is_array( $configArray ) ) {
foreach ( $configArray as $sectionName => $sectionConf ) {
if ( substr( $sectionName, 0, 6 ) == 'remote' ) {
$remote = $sectionConf;
}
}
}
if ( $remote !== false && isset( $remote['url'] ) ) {
$url = $remote['url'];
}
}
$this->cache['remoteURL'] = $url;
}
return $this->cache['remoteURL'];
}
/**
* Check to see if the current cache is fully populated.
*
* Note: This method is public only to make unit testing easier. There's
* really no strong reason that anything other than a test should want to
* call this method.
*
* @return bool True if all expected cache keys exist, false otherwise
*/
public function cacheIsComplete() {
return isset( $this->cache['head'] ) &&
isset( $this->cache['headSHA1'] ) &&
isset( $this->cache['headCommitDate'] ) &&
isset( $this->cache['branch'] ) &&
isset( $this->cache['remoteURL'] );
}
/**
* Precompute and cache git information.
*
* Creates a JSON file in the cache directory associated with this
* GitInfo instance. This cache file will be used by subsequent GitInfo objects referencing
* the same directory to avoid needing to examine the .git directory again.
*
* @since 1.24
*/
public function precomputeValues() {
if ( $this->cacheFile !== null ) {
// Try to completely populate the cache
$this->getHead();
$this->getHeadSHA1();
$this->getHeadCommitDate();
$this->getCurrentBranch();
$this->getRemoteUrl();
if ( !$this->cacheIsComplete() ) {
wfDebugLog( 'gitinfo',
"Failed to compute GitInfo for \"{$this->basedir}\""
);
return;
}
$cacheDir = dirname( $this->cacheFile );
if ( !file_exists( $cacheDir ) &&
!wfMkdirParents( $cacheDir, null, __METHOD__ )
) {
throw new MWException( "Unable to create GitInfo cache \"{$cacheDir}\"" );
}
file_put_contents( $this->cacheFile, FormatJson::encode( $this->cache ) );
}
}
/**
* @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 = $wgGitRepositoryViewers;
Hooks::run( 'GitViewers', [ &self::$viewers ] );
}
return self::$viewers;
}
}