This can be more clearly explained with an example.
Module 1 - has hook_requirement()
Module 2 - dependent on Module 1
When installing both modules the following occurs.
Module 1 hook_requirements() has a failure
Module 2 is installed
Module 2 malfunctions due to missing dependency and a WSOD results.
Not sure if this is by design (as in don't want to deal with it) or what.
Comments
Comment #1
grendzy commentedMore details are in this issue:
#389126: system_modules_submit() disable only the module whose hook_requirements() returns an error, not the modules depending from it