Display the current Git 'version' in PHP

Question

I want to display the Git version on my site.

How can I display a semantic version number from Git, that non-technical users of a site can easily reference when raising

Answer 1

Firstly, some git commands to fetch version information:

• commit hash long
  • git log --pretty="%H" -n1 HEAD
• commit hash short
  • git log --pretty="%h" -n1 HEAD
• commit date
  • git log --pretty="%ci" -n1 HEAD
• tag
  • git describe --tags --abbrev=0
• tag long with hash
  • git describe --tags

Secondly, use exec() combined with the git commands of your choice from above to build the version identifier:

class ApplicationVersion
{
    const MAJOR = 1;
    const MINOR = 2;
    const PATCH = 3;

    public static function get()
    {
        $commitHash = trim(exec('git log --pretty="%h" -n1 HEAD'));

        $commitDate = new \DateTime(trim(exec('git log -n1 --pretty=%ci HEAD')));
        $commitDate->setTimezone(new \DateTimeZone('UTC'));

        return sprintf('v%s.%s.%s-dev.%s (%s)', self::MAJOR, self::MINOR, self::PATCH, $commitHash, $commitDate->format('Y-m-d H:i:s'));
    }
}

// Usage: echo 'MyApplication ' . ApplicationVersion::get();

// MyApplication v1.2.3-dev.b576fd7 (2016-11-02 14:11:22)

Answer 2

Run git tag in terminal to preview your tags and say you got i.e:

v1.0.0
v1.1.0
v1.2.4

here's how to get the latest version v1.2.4

function getVersion() {
  $hash = exec("git rev-list --tags --max-count=1");
  return exec("git describe --tags $hash"); 
}
echo getVersion(); // "v1.2.4"

Coincidentally (if your tags are ordered), since exec returns only the last row we could just do:

function getVersion() {
  return exec("git tag");
}
echo getVersion(); // "v1.2.4"

To get all the rows string use shell_exec:

function getVersions() {
  return shell_exec("git tag");
}
echo getVersions(); // "v1.0.0
                    // v1.1.0
                    // v1.2.4"

To get an Array:

$tagsArray = explode(PHP_EOL, shell_exec("git tag"));

To sort tags by date:

git tag --sort=committerdate

Docs: git-for-each-ref#_field_names

For sorting purposes, fields with numeric values sort in numeric order (objectsize, authordate, committerdate, creatordate, taggerdate). All other fields are used to sort in their byte-value order.

Answer 3

Simple way:

• Short hash: $rev = exec('git rev-parse --short HEAD');
• Full hash: $rev = exec('git rev-parse HEAD');

Answer 4

I did it just as:

substr(file_get_contents(GIT_DIR.'/refs/heads/master'),0,7)

resource friendly and the same as i have under eclipse shown

Answer 5

Gist: https://gist.github.com/lukeoliff/5501074

<?php

class QuickGit {

  public static function version() {
    exec('git describe --always',$version_mini_hash);
    exec('git rev-list HEAD | wc -l',$version_number);
    exec('git log -1',$line);
    $version['short'] = "v1.".trim($version_number[0]).".".$version_mini_hash[0];
    $version['full'] = "v1.".trim($version_number[0]).".$version_mini_hash[0] (".str_replace('commit ','',$line[0]).")";
    return $version;
  }

}

Answer 6

If you'd like to do it without exec() and you're using git lightweight (see comments below) tagging:

You can get the current HEAD commit hash from .git/HEAD or .git/refs/heads/master. We then loop to find matching. Reversing the array first for speed because you're more likely to at a higher recent tag.

So if the current php file sits in a public_html or www folder one level down from the .git folder...

<?php

$HEAD_hash = file_get_contents('../.git/refs/heads/master'); // or branch x

$files = glob('../.git/refs/tags/*');
foreach(array_reverse($files) as $file) {
    $contents = file_get_contents($file);

    if($HEAD_hash === $contents)
    {
        print 'Current tag is ' . basename($file);
        exit;
    }
}

print 'No matching tag';