Pleskで PHP Composer でエラー Could not update the integration plugin

カテゴリー：Plesk

記事作成日：2020-04-17

Plesk Obsidian 18.0.25 の PHP Composer を実行するとエラー。<br>
PHP Composer のアンインストール/インストールを実施してもダメ。

エラー表示内容
```
Could not update the integration plugin

・Changed current directory to /var/www/vhosts/domain.tld/.composer
・./composer.json has been created
・Loading composer repositories with package information
・Updating dependencies
・Your requirements could not be resolved to an installable set of packages.
・
・Problem 1
・- Root composer.json requires plesk/composer-command-info ~1.0.2 -> satisfiable by plesk/composer-command-info[1.0.2].
・- plesk/composer-command-info 1.0.2 requires composer-plugin-api ^1.1 -> found composer-plugin-api[2.0.0] but it does not match your constraint.
・
・You are using a snapshot build of Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report an issue to them to ask them to support Composer 2. To work around this you can run Composer with --ignore-platform-reqs, but this will also ignore your PHP version and may result in bigger problems down the line.
・Running update with --no-dev does not mean require-dev is ignored, it just means the packages will not be installed. If dev requirements are blocking the update you have to resolve those problems.
・
・Installation failed, deleting ./composer.json.

```

今回は、CakePHP4のアップデートチェックだったので、同時に以下のメッセージも表示された。
```
パッケージを読み込めません。Invalid version string "* 4.0.4"
```

情報を集めると、composer.phar が次期バージョン(アルファ版?ベータ版?)に置き換わってしまったことが原因らしい。<br>
公式から現行の composer.phar を取得して置き換えれば正常に戻るとのこと。

## 実施したこと

何もしなかった。3日間ほど様子を見た。

自然と直っていました。Plesk側が問題に気づいて自動修復させたのだろう。

問題発覚日： 2020-04-13<br>
問題解消日： 2020-04-15

## 現象を直したい場合

We work with a Stable composer (latest version 1.10), and we are not working with version 2.0
As a temporary workaround, the composer version can be downgraded to version 1.10.1:
```
Run the command below:
# composer self-update 1.10.1

Download the necessary version of the file:
# wget https://getcomposer.org/composer-stable.phar

Make a backup of the previous file:
# mv /usr/lib64/plesk-9.0/composer.phar{,.bak}

Move the downloaded file to the necessary directory:
# mv composer-stable.phar /usr/lib64/plesk-9.0/composer.phar

Add permission for execution:
# chmod +x /usr/lib64/plesk-9.0/composer.phar
```

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