New feature: build without 'src' directory

[mever]

It would be nice to build a charm without 'src' directory. If I build my project with gocharm the resulting directory looks like this:

11M     bin
12K     config.yaml
172K    hooks
12K     metadata.yaml
12K     README.md
86M     src

However the source directory takes 86 MB and isn't really necessary for the charm. Without it the charm is in total around 11 MB. If I remove it and upgrade the charm it works perfectly without it. So do we really need this directory?

If you like I can donate some time for a PR to add a build flag. Copying the 'assets' (

gocharm/cmd/gocharm/main.go

Line 213 in ee7a68e

if _, err := os.Stat(filepath.Join(destPkgDir, "assets")); err == nil {

) folder if there is one.

The reason why my source directory is so large is because it also has some files that are not compiled into the binary. But none the less it seems like a nice feature to have.

[rogpeppe]

Thanks for raising this issue.

I'd accept a PR that added a -no-source flag that caused the source package
directory copying to be omitted.

If specified and the assets directory exists in the package source, instead of
symlinking the assets directory, it would just create a direct copy in the top level
of the charm directory.