istanbuljs / nyc / 1754 / 1

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Pull #957

travis-ci

feat: avoid hardcoded HOME for spawn-wrap working dir

By default, spawn-wrap writes temporary files to HOME.
It used to be /tmp, but it changed that to HOME to support
environments that have 'noexec' flags set on their tmpfs mount.
Ref https://github.com/tapjs/spawn-wrap/issues/3.

The problem with this is that nyc now no longer works in environments
without a (writable) home directory (e.g. the 'nobody' user on
Linux).

While it is fine to fallback to HOME, it should write elsewhere
if that is unavailable, and ideally in a way that doesn't require
every sysadmin or end-user to hardcode some environment variable
in their package.json specifically for nyc or spawn-wrap.

A common way to communicate this intent is with the XDG_CACHE_HOME
environment variable.

Fixes #951.

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