show package name for which tests run

[jschaul]

This change leads to the following new behaviour:

• show package name for the unit tests that run
• stop executing other packages' unit tests if there's a failure

doesn't warrant a changelog I think.

[stephen-smith]

Maybe the workaround[1] isn't worth it, but this will cause problems if there's ever an IFS character (e.g. SPC) in a package name.

[1] Have xargs invoke a /bin/sh subshell and use $1 there instead of $p.

[akshaymankar]

I think using xargs makes it not possible to stop the execution on first test failure.

[stephen-smith]

You can definately stop a GNU xargs run:

If any invocation of the command exits with a status of 255, xargs will stop immediately without reading any further input.

and that's standard behavior, too:

This sequence shall be repeated until one of the following occurs: [...] An invocation of a constructed command line returns an exit status of 255.

[jschaul]

I don't get the discussion; haskell package names never contain spaces, so this is a silly objection. But if that's what it takes to get a positive review on this PR that has been hanging for two weeks; then; sure, see 5e3333e.

[stephen-smith]

Sorry, it was not my intent to hold things up or require any changes.