symfony/polyfill-mbstring can no longer be installed (as of today)

[Bilge]

This happens on Ubuntu CI but I can also reproduce it on Windows locally if I clear Composer caches.

  - Installing symfony/polyfill-mbstring (v1.25.0): Extracting archive

...

    Failed to extract symfony/polyfill-mbstring: (9) '/usr/bin/unzip' -qq '/home/vsts/work/1/s/vendor/composer/tmp-eb1a103d57979791875398d4c26acab1' -d '/home/vsts/work/1/s/vendor/composer/dd822d03'

[/home/vsts/work/1/s/vendor/composer/tmp-eb1a103d57979791875398d4c26acab1]
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of /home/vsts/work/1/s/vendor/composer/tmp-eb1a103d57979791875398d4c26acab1 or
        /home/vsts/work/1/s/vendor/composer/tmp-eb1a103d57979791875398d4c26acab1.zip, and cannot find /home/vsts/work/1/s/vendor/composer/tmp-eb1a103d57979791875398d4c26acab1.ZIP, period.

    The archive may contain identical file names with different capitalization (which fails on case insensitive filesystems)
    Unzip with unzip command failed, falling back to ZipArchive class
    Install of symfony/polyfill-mbstring failed

In ZipDownloader.php line 209:
                                                                               
  '/home/vsts/work/1/s/vendor/composer/tmp-eb1a103d57979791875398d4c26acab1'   
  is not a zip archive.                                                        

The lockfile that causes this error is this one. Frustratingly, the error is intermittent, however it occurs often, though not always.

[Nicolas Grekas]

This looks like an issue on GitHub. We can't do anything about it I fear.
We just released v1.26.0 hoping that the new ZIPs won't be corrupted.
Try composer up symfony/polyfill-* 🤞

[Jan Vernieuwe]

Is there a way to fix the corrupted one?
Would save me a lot of work going trough all the services and updating the dependency.

[Christophe Coevoet]

Maybe the github support can. That's a ZIP file provided by github

[Nicolas Grekas]

Contacting GitHub support and hoping they figure out the issue? Nothing we're in control of unfortunately.

[Grégoire Pineau]

Hello, I had the same issue, it's now fixed

[ucan-lab]

I had the same issue. I avoided it as follows.

composer.json

{
    "config": {
        "preferred-install": {
            "symfony/polyfill-*": "source",
            "*": "dist"
        },
    },
}

[Alexander M. Turek]

Let's close the issue then. We can't do anything on our side and apparently it has been fixed by GitHub already.