在PHP中可移植地检索Subversion 1.7版本？

Question

In Subversion 1.6, there was an .svn directory in every working copy directory. I could use the following code to quickly retrive the current revision number without the need for shell access/execution.

public function getSubversionRevision() {
    if(file_exists("../.svn/entries")) {
        $svn = File("../.svn/entries");
        return (int)$svn[3];
    }
    return false;
}

Subversion 1.7 breaks this code. There is now only one .svn directory per local repository. There is an entries file in this directory but it no longer has anything useful for me. It looks like everything I need is now in a SQLite database. Specifically wc.db. I suppose I could use PHP's SQLite functions to get the info I need, but this sounds a little too expensive to run on every (or close to every) page load.

Any ideas? Breaking out the exec function and hoping that Subversion binaries are installed (and in the $PATH!) is a last resort. To summarize, I need to find a way to locate the .svn directory at the root of the repository (which could be different depending on your checkout location) and then somehow parse a file in there (probably wc.db) in a cost-effective way.

Answer 1

You can write a script to svn update for you every time, and scrap the revision number from the update's output into a file. The following bash script should more or less do it:

#!/bin/bash

svn --non-interactive update .. 
svn --non-interactive update .. | perl -p -e "s/.* revision ([\d]*)\./\$1/" > ../version.phtml;