Finally, finally this is done. This allows import paths to be obfuscated by modifying
object/archive files and garbling import paths contained within. The bulk of the
code that makes parsing and writing Go object/archive files possible lives at
https://github.com/Binject/debug/tree/master/goobj2, which I wrote as well.
I have tested by garbling and checking for import paths via strings and grep
(in order of difficulty) https://github.com/lu4p/binclude, garble itself, and
https://github.com/dominikh/go-tools/tree/master/cmd/staticcheck.
This only supports object/archive files produced from the Go 1.15 compiler.
The object file format changed at 1.15, and 1.14 and earlier is not supported.
Fixes#13.
Most notably, x/mod now includes the GOPRIVATE pattern-matching API we
were copying before, so we can use it directly.
Also bump the Go version requirement to 1.15, in preparation for the
import path obfuscation PR, and don't let the gotip job fail the entire
workflow.
Also remove the -toolexec equivalent, as it's becoming longer now that
we have GARBLE_DIR, and it might become out of date in the future again.
We don't want users to assume it will work forever.
Carefully select a default that will do the right thing when inside a
module, as well as when building ad-hoc packages.
This means we no longer need to look at the compiler's -std flag, which
is nice.
Also replace foo.com/ with test/, as per golang/go#37641.
Fixes#7.
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.
Andrew LeFevre
Daniel Martí
lu4p