We use 'go list -json -export' to locate required modules. This works
fine to locate direct module dependencies; since we're building in the
current module, we run 'go list' in the correct directory.
However, if we're building one of those module dependencies, and it has
other module dependencies of its own, we would fail with cryptic errors
like:
typecheck error: [...] go list error: updates to go.sum needed, disabled by -mod=readonly
This is because we would try to run 'go list' outside of the main
module, probably inside the module cache. Instead, use a $GARBLE_DIR env
var from the top-level 'garble build' call to always run 'go list' in
the original directory.
We add a few small modules to properly test this.
Updates #9.
In the added test case, we'd see a failure, since we garbled the name of
the "Embedded" type but not its use as an anonymous field. Garble both.
This might possibly break some reflect code, but it doesn't seem like we
have an option. When we garble a type, it's impossible to tell if it's
going to be used as an anonymous field later.
Updates #9.
It fails on all three GitHub platforms, for some reason. Something
related to permission denied errors in the module cache.
It's unclear to me why we're trying to modify the build cache. For now,
un-break master.
This is important, because "-std -foo" and "-buildid -foo" are entirely
different cases. The first is equivalent to "-std=true -foo" since the
flag is boolean, but the second is equivalent to "-buildid=-foo" since
the flag isn't boolean.
We can keep track of which of the flags we're interested in are boolean,
which isn't much extra work. Also add unit tests; the build ID is a
hash, so it's very hard to write an end-to-end test that reliably has an
ID starting with a dash.
'go tool compile' receives the package path via the -p flag. This is
better than making up one.
We have to be careful with "-p main" though, as that's not part of the
standard library.
The problem with the "grep" built-in command is that it prints the
entire data if there is an error. We don't want megabytes of binary
output for a test.
Daniel Martí