[BUG] SysImg install incompatible with submodules

[Miles Cranmer]

AirspeedVelocity.jl is split into submodules, with each submodule defining a different executable (with @main). This is my deps/build.jl:

using AirspeedVelocity

AirspeedVelocity.BenchPkg.comonicon_install()
AirspeedVelocity.BenchPkgPlot.comonicon_install()
AirspeedVelocity.BenchPkgTable.comonicon_install()

This works fine, and gives me three commands: benchpkg, benchpkgplot, and benchpkgtable, which is what I want.

However, when I ask for system image versions, like this:

using AirspeedVelocity
using Comonicon: Configs

sysimg_settings = Configs.SysImg(; incremental=true, filter_stdlibs=false)

AirspeedVelocity.BenchPkg.comonicon_install(; sysimg=sysimg_settings)
AirspeedVelocity.BenchPkgPlot.comonicon_install(; sysimg=sysimg_settings)
AirspeedVelocity.BenchPkgTable.comonicon_install(; sysimg=sysimg_settings)

I get the following error:

ERROR: LoadError: package(s) BenchPkg not in project
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] check_packages_in_project(ctx::Pkg.Types.Context, packages::Vector{String})
    @ PackageCompiler ~/.julia/packages/PackageCompiler/i90pX/src/PackageCompiler.jl:112
  [3] create_sysimage(packages::Vector{Symbol}; sysimage_path::String, project::String, precompile_execution_file::Vector{String}, precompile_statements_file::Vector{String}, incremental::Bool, filter_stdlibs::Bool, cpu_target::String, script::Nothing, sysimage_build_args::Cmd, include_transitive_dependencies::Bool, base_sysimage::Nothing, julia_init_c_file::Nothing, version::Nothing, soname::Nothing, compat_level::String, extra_precompiles::String)
    @ PackageCompiler ~/.julia/packages/PackageCompiler/i90pX/src/PackageCompiler.jl:516
  [4] create_sysimage
    @ ~/.julia/packages/PackageCompiler/i90pX/src/PackageCompiler.jl:476 [inlined]
  [5] build_sysimg(m::Module, options::Comonicon.Configs.Comonicon; incremental::Bool, cpu_target::String, filter_stdlibs::Bool)
    @ Comonicon.Builder ~/.julia/packages/Comonicon/rMXvw/src/builder/sysimg.jl:13
  [6] build_sysimg
    @ ~/.julia/packages/Comonicon/rMXvw/src/builder/sysimg.jl:1 [inlined]
  [7] install_sysimg(m::Module, options::Comonicon.Configs.Comonicon)
    @ Comonicon.Builder ~/.julia/packages/Comonicon/rMXvw/src/builder/install.jl:60
  [8] install(m::Module, options::Comonicon.Configs.Comonicon)
    @ Comonicon.Builder ~/.julia/packages/Comonicon/rMXvw/src/builder/install.jl:13
  [9] (::Comonicon.Builder.var"#2#3"{Module, Comonicon.Configs.Comonicon})()
    @ Comonicon.Builder ~/.julia/packages/Comonicon/rMXvw/src/builder/cli.jl:64
 [10] with_logstate(f::Function, logstate::Any)
    @ Base.CoreLogging ./logging.jl:514
 [11] with_logger
    @ ./logging.jl:626 [inlined]
 [12] command_main(m::Module, options::Comonicon.Configs.Comonicon)
    @ Comonicon.Builder ~/.julia/packages/Comonicon/rMXvw/src/builder/cli.jl:63
 [13] #command_main#1
    @ ~/.julia/packages/Comonicon/rMXvw/src/builder/cli.jl:49 [inlined]
 [14] command_main
    @ ~/.julia/packages/Comonicon/rMXvw/src/builder/cli.jl:47 [inlined]
 [15] #comonicon_install#3
    @ ~/.julia/packages/Comonicon/rMXvw/src/frontend/cast.jl:495 [inlined]
 [16] top-level scope
    @ ~/AirspeedVelocity.jl/deps/build.jl:6
 [17] include(fname::String)
    @ Base.MainInclude ./client.jl:478
 [18] top-level scope
    @ none:5
in expression starting at /Users/mcranmer/AirspeedVelocity.jl/deps/build.jl:6

[Xiu-zhe (Roger) Luo]

This needs more changes since I wasn't expecting the cases with multiple entries - they make no difference with single-entry multiple sub-commands for Julia and perhaps worse latency then you would expect... because Julia will still load the whole package instead of one single sub-module.