Flex: Imcompatible declaration of Symfony\Flex\ParallelDownloader::getRemoteContents(...)

[Aryess]

Hi,

Looks like a breaking change was introduced a couple hours ago in composer (link), which gives the following error:

[ErrorException]                                                                                             
  Declaration of Symfony\Flex\ParallelDownloader::getRemoteContents($originUrl, $fileUrl, $context) should be  
   compatible with Composer\Util\RemoteFilesystem::getRemoteContents($originUrl, $fileUrl, $context, ?array &  
  $responseHeaders = NULL) 

Cheers

[nicolas-grekas]

Correct, you need to upgrade Flex.

[nicolas-grekas]

I don't think there is any other way around. You might need to run composer update --no-plugins to do so. If it doesn't work, you might need to downgrade to a stable version of Composer, do the update and upgrade again.

[Aryess]

Duh. Somehow missed the Flex update. Sorry about that.

[garak]

What about environments where composer is out of your control? For example, I'm getting my CircleCI builds failing because of this

[nicolas-grekas]

The composer.lock is yours: you should ensure it references an updated flex version.

[garak]

So, this is my current situation: build before running "composer update" was fine, build after is broken (with above error). Since I can't update composer inside build image, what can I do? I'd prefer to avoid to keep an old version of vendors

[nicolas-grekas]

The issue is independent from Composer there is no need to update or downgrade it.
You need to update flex instead.
I don't know how you manage your dependencies, so I can't do much more.
composer update symfony/flex --no-plugins is the minimum command you should run.

[garak]

I thought it was related to recently published composer 1.7, as I read in the aforementioned issue.
Anyway, I already updated all vendors and now I also tried your command for a specific update (but it was a "Nothing to install or update").
My current flex version is v1.0.89 with Symfony 4.1.3

[KilMer56]

Hi ! I've got exactly the same problem. I saw that composer had an upgrade the 2018-08-03, does anyone know how to downgrade it ? I think that this can solve the problem

[garak]

I tried a build without cache and it works. So it looks like my issue was with CircleCi

[blazejkrzak]

try composer update symfony/flex
within CircleCI rebuild without cache

[KilMer56]

The problem is that i use composer in docker so i can't update symfony/flex because i've got no composer.json before i build the image.

[blazejkrzak]

docker-compose exec yourappname composer update symfony/flex

or if You build it manually in Dockerfile write line RUN composer update symfony/flex

[sdrean]

Hi, I've got the same error in CircleCI only. I correct all by

• not using the restore_cache in the config.yml
• using flex in 1.0.80.

[ArnaudBarre]

I needed to clear Travis cache too.