From dbea8258711bcdcc3ddf620c7e2e9783ea19f00a Mon Sep 17 00:00:00 2001
From: William Sandin <w@wsand.in>
Date: Sun, 31 Dec 2017 19:35:09 +0700
Subject: [PATCH 1/3] Raise a warning if current user and owner of deploy dir
 doesn't match

---
 src/Composer/Command/SelfUpdateCommand.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Composer/Command/SelfUpdateCommand.php b/src/Composer/Command/SelfUpdateCommand.php
index 055f8af7f..1f86e7ed9 100644
--- a/src/Composer/Command/SelfUpdateCommand.php
+++ b/src/Composer/Command/SelfUpdateCommand.php
@@ -93,7 +93,9 @@ EOT
         $cacheDir = $config->get('cache-dir');
         $rollbackDir = $config->get('data-dir');
         $home = $config->get('home');
+        $homeOwner = posix_getpwuid(fileowner($home));
         $localFilename = realpath($_SERVER['argv'][0]) ?: $_SERVER['argv'][0];
+        $composeUser = posix_getpwuid(posix_geteuid());
 
         if ($input->getOption('update-keys')) {
             return $this->fetchKeys($io, $config);
@@ -107,6 +109,11 @@ EOT
             throw new FilesystemException('Composer update failed: the "'.$tmpDir.'" directory used to download the temp file could not be written');
         }
 
+        // check if composer is running as the same user that owns the directory root
+        if ($composeUser !== $homeOwner) {
+          $io->writeError('<warning>You are running composer as "'.$composeUser.'", while "'.$home.'" is owned by "'.$homeOwner.'"</warning>');
+        }
+
         if ($input->getOption('rollback')) {
             return $this->rollback($output, $rollbackDir, $localFilename);
         }

From 4296fe657f3e0568f3e820473831536f254813e0 Mon Sep 17 00:00:00 2001
From: William Sandin <w@wsand.in>
Date: Sat, 6 Jan 2018 19:02:14 +0700
Subject: [PATCH 2/3] Adding check to confirm POSIX is defined and callable

---
 src/Composer/Command/SelfUpdateCommand.php | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/Composer/Command/SelfUpdateCommand.php b/src/Composer/Command/SelfUpdateCommand.php
index 1f86e7ed9..147d65c02 100644
--- a/src/Composer/Command/SelfUpdateCommand.php
+++ b/src/Composer/Command/SelfUpdateCommand.php
@@ -93,9 +93,7 @@ EOT
         $cacheDir = $config->get('cache-dir');
         $rollbackDir = $config->get('data-dir');
         $home = $config->get('home');
-        $homeOwner = posix_getpwuid(fileowner($home));
         $localFilename = realpath($_SERVER['argv'][0]) ?: $_SERVER['argv'][0];
-        $composeUser = posix_getpwuid(posix_geteuid());
 
         if ($input->getOption('update-keys')) {
             return $this->fetchKeys($io, $config);
@@ -109,9 +107,13 @@ EOT
             throw new FilesystemException('Composer update failed: the "'.$tmpDir.'" directory used to download the temp file could not be written');
         }
 
-        // check if composer is running as the same user that owns the directory root
-        if ($composeUser !== $homeOwner) {
-          $io->writeError('<warning>You are running composer as "'.$composeUser.'", while "'.$home.'" is owned by "'.$homeOwner.'"</warning>');
+        // check if composer is running as the same user that owns the directory root, only if POSIX is defined and callable
+        if (function_exists('posix_getpwuid') && function_exists('posix_geteuid')) {
+            $composeUser = posix_getpwuid(posix_geteuid());
+            $homeOwner = posix_getpwuid(fileowner($home));
+            if ($composeUser !== $homeOwner) {
+              $io->writeError('<warning>You are running composer as "'.$composeUser.'", while "'.$home.'" is owned by "'.$homeOwner.'"</warning>');
+            }
         }
 
         if ($input->getOption('rollback')) {

From 49068c579ea5ace2e1b105da19ec81f5fa88c26b Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Wed, 24 Jan 2018 11:14:40 +0100
Subject: [PATCH 3/3] Fix indenting

---
 src/Composer/Command/SelfUpdateCommand.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Composer/Command/SelfUpdateCommand.php b/src/Composer/Command/SelfUpdateCommand.php
index 147d65c02..3ed72bdbc 100644
--- a/src/Composer/Command/SelfUpdateCommand.php
+++ b/src/Composer/Command/SelfUpdateCommand.php
@@ -112,7 +112,7 @@ EOT
             $composeUser = posix_getpwuid(posix_geteuid());
             $homeOwner = posix_getpwuid(fileowner($home));
             if ($composeUser !== $homeOwner) {
-              $io->writeError('<warning>You are running composer as "'.$composeUser.'", while "'.$home.'" is owned by "'.$homeOwner.'"</warning>');
+                $io->writeError('<warning>You are running composer as "'.$composeUser.'", while "'.$home.'" is owned by "'.$homeOwner.'"</warning>');
             }
         }