Installation fails with "squizlabs/php_codesniffer/CodeSniffer.php" file not found error

[86me]

I'm trying to set up the php-console server portion to use on a Drupal 8 web site. composer require php-console/php-console call (in the root of my Drupal installation with a composer.json file) fails with the following output:

Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/CLI.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Exception.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/File.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Fixer.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Report.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Reporting.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Sniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Tokens.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Reports/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Tokenizers/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/DocGenerators/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractPatternSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractScopeSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractVariableSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/IncorrectPatternException.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Generic/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/MySource/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PEAR/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PSR1/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PSR2/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Squiz/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Zend/Sniffs/" which does not appear to be a file nor a folder
Using version ^3.1 for php-console/php-console
./composer.json has been updated
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/CLI.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Exception.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/File.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Fixer.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Report.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Reporting.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Sniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Tokens.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Reports/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Tokenizers/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/DocGenerators/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractPatternSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractScopeSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractVariableSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/IncorrectPatternException.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Generic/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/MySource/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PEAR/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PSR1/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PSR2/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Squiz/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Zend/Sniffs/" which does not appear to be a file nor a folder
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating autoload files
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/CLI.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Exception.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/File.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Fixer.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Report.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Reporting.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Sniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Tokens.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Reports/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Tokenizers/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/DocGenerators/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractPatternSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractScopeSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/AbstractVariableSniff.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/IncorrectPatternException.php" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Generic/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/MySource/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PEAR/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PSR1/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/PSR2/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Squiz/Sniffs/" which does not appear to be a file nor a folder
Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Zend/Sniffs/" which does not appear to be a file nor a folder
> Drupal\Core\Composer\Composer::preAutoloadDump

Installation failed, reverting ./composer.json to its original content.

  [RuntimeException]
  Could not scan for classes inside "/srv/http/mysite.com/vendor/squizlabs/php_codesniffer/CodeSni
  ffer.php" which does not appear to be a file nor a folder

require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...

Haven't had the time to muck around with any other attempts to get things working. Hoping someone else has had this issue and been able to resolve it fairly simply.

[86me]

I think this is a drupal specific issue, so I've opened an issue over at https://www.drupal.org/project/issues/pc/2922810