Useful if Composer is provided on a read-only filesystems, to allow self-update to work with a different destination
@@ -351,6 +351,10 @@ TAGSPUBKEY
@copy($localFilename, $backupTarget);
}
+ if ($targetFilename = getenv('COMPOSER_SELF_UPDATE_TARGET')) {
+ $localFilename = realpath($targetFilename) ?: $targetFilename;
+ }
+
rename($newFilename, $localFilename);
return null;