bug #41780 [PhpUnitBridge] fix handling the COMPOSER_BINARY env var w…

…hen using simple-phpunit (Taluu)

This PR was merged into the 4.4 branch.

Discussion
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[PhpUnitBridge] fix handling the COMPOSER_BINARY env var when using simple-phpunit

| Q             | A
| ------------- | ---
| Branch?       | 4.4 and next
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #41774
| License       | MIT

Since the renaming of the simple phpunit file (from the shebang to the php file) in #31364, it looks like the change made from #36566 was lost as it seems to have been merged after.

So this PR is an attempt to "restore" that functionnality, as it was considered a bug fix on 3.4 at the time.

poke `@nicolas`-grekas

Commits
-------

9589b52 Reapply the change to allow to set the composer binary path

src/Symfony/Bridge/PhpUnit/bin/simple-phpunit.php

@@ -150,12 +150,14 @@
     putenv('SYMFONY_DEPRECATIONS_HELPER=disabled');
 }
 
-$COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar')
-    || ($COMPOSER = rtrim((string) ('\\' === \DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar 2> NUL`) : `which composer.phar 2> /dev/null`)))
-    || ($COMPOSER = rtrim((string) ('\\' === \DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer 2> NUL`) : `which composer 2> /dev/null`)))
-    || file_exists($COMPOSER = rtrim((string) ('\\' === \DIRECTORY_SEPARATOR ? `git rev-parse --show-toplevel 2> NUL` : `git rev-parse --show-toplevel 2> /dev/null`)).\DIRECTORY_SEPARATOR.'composer.phar')
-    ? ('#!/usr/bin/env php' === file_get_contents($COMPOSER, false, null, 0, 18) ? $PHP : '').' '.escapeshellarg($COMPOSER) // detect shell wrappers by looking at the shebang
-    : 'composer';
+if (false === $COMPOSER = getenv('COMPOSER_BINARY')) {
+    $COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar')
+        || ($COMPOSER = rtrim((string) ('\\' === \DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar 2> NUL`) : `which composer.phar 2> /dev/null`)))
+        || ($COMPOSER = rtrim((string) ('\\' === \DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer 2> NUL`) : `which composer 2> /dev/null`)))
+        || file_exists($COMPOSER = rtrim((string) ('\\' === \DIRECTORY_SEPARATOR ? `git rev-parse --show-toplevel 2> NUL` : `git rev-parse --show-toplevel 2> /dev/null`)).\DIRECTORY_SEPARATOR.'composer.phar')
+        ? ('#!/usr/bin/env php' === file_get_contents($COMPOSER, false, null, 0, 18) ? $PHP : '').' '.escapeshellarg($COMPOSER) // detect shell wrappers by looking at the shebang
+        : 'composer';
+}
 
 $prevCacheDir = getenv('COMPOSER_CACHE_DIR');
 if ($prevCacheDir) {