How to test if composer.lock is up to date?

Question

During development (multiple people in the team) sometimes composer install returns:

Warning: The lock file is not up to date with the latest change

Answer 1

For composer < 1.3.0

Extending from @Domster, the solution in pure bash:

COMPOSER_IN_SYNC=$(expr "`cat composer.lock | grep '"hash":' | cut -d'"' -f4`" = "`md5sum composer.json | cut -d ' ' -f 1`")

$COMPOSER_IN_SYNC will be 0 or 1 respectively.