(1.10) Extensions that trigger on the current project are ignored by ] precompile

[topolarity]

... exposed a new bug on 1.10:

$ ./julia --project=test/project/Extensions/Parent.jl -q
(Parent) pkg> precompile
Precompiling project...
  ✓ DepWithParentExt
  ✓ Parent
  2 dependencies successfully precompiled in 2 seconds

julia> using Parent
[ Info: Precompiling ParentExt [3290166e-fa45-5082-a21d-a36e4f051b06]

] precompile doesn't realize it needs to compile the extension because it doesn't have Parent in the old manifest format.

Originally posted by @topolarity in #56666 (comment)

[topolarity]

I got the Manifest-related details mixed up a bit here. I think the 1.10 behavior is affected by whether or not you use the new manifest with it (it doesn't complain if you do), but the new manifest is on nightly not 1.11 so that's not why this is working on 1.11

Anyway this is definitely an issue on 1.10 and seems to be OK on 1.11

[KristofferC]

We (probably me) could bisect this on 1.11 to see what fixed it there (considering that the fact that the main package inclusion in the manifest came in 1.12 with the introduction of workspaces).

[topolarity]

It looks like it came in somewhere around where we moved pre-compilation to Base:

On 1.10, deps is just from the Manifest: https://github.com/JuliaLang/Pkg.jl/blob/845909f49043c8c78ca2aebdcd9aee434ea70279/src/API.jl#L1169

But on 1.11, it includes entries from the Project:

julia/base/precompilation.jl

Lines 177 to 183 in 040a6ce

	if proj_name !== nothing && proj_uuid !== nothing
	deps_expanded[proj_uuid] = filter!(!=(proj_uuid), collect(values(project_deps)))
	extensions_expanded[proj_uuid] = project_extensions
	path = get(project_d, "path", nothing)::Union{String, Nothing}
	entry_point = path !== nothing ? path : dirname(envpath)
	lookup_strategy[proj_uuid] = entry_point
	end

[KristofferC]

We could copy paste the current precompilation code back into Pkg :P.

[topolarity]

Another problem I found...

If you change DepWithParentExt to have a strong dep on Parent (intentionally creating a cycle between the two), then you get this stack trace:

(Parent) pkg> precompile
ERROR: KeyError: key "Parent" not found
Stacktrace:
  [1] getindex
    @ ./dict.jl:498 [inlined]
  [2] precompile(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; internal_call::Bool, strict::Bool, warn_loaded::Bool, already_instantiated::Bool, timing::Bool, _from_loading::Bool, kwargs::@Kwargs{io::Base.TTY})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:1168
  [3] precompile(pkgs::Vector{Pkg.Types.PackageSpec}; io::Base.TTY, kwargs::@Kwargs{})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:159
  [4] precompile(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:148
  [5] precompile(pkgs::Vector{String})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:147
...

This again works OK on 1.11

[topolarity]

Oof. You also hit that error if you only add a symmetric extension Parent → DepWithParentExtExt:

diff --git a/test/project/Extensions/Parent.jl/Project.toml b/test/project/Extensions/Parent.jl/Project.toml
index a79ec8859b..9119864a47 100644
--- a/test/project/Extensions/Parent.jl/Project.toml
+++ b/test/project/Extensions/Parent.jl/Project.toml
@@ -4,3 +4,6 @@ version = "0.1.0"

 [deps]
 DepWithParentExt = "8a35c396-5ffc-40d2-b7ec-e8ed2248da32"
+
+[extensions]
+DepWithParentExtExt = "DepWithParentExt"
diff --git a/test/project/Extensions/Parent.jl/ext/DepWithParentExtExt.jl b/test/project/Extensions/Parent.jl/ext/DepWithParentExtExt.jl
new file mode 100644
index 0000000000..c9232efcbd
--- /dev/null
+++ b/test/project/Extensions/Parent.jl/ext/DepWithParentExtExt.jl
@@ -0,0 +1,6 @@
+module DepWithParentExtExt
+
+using DepWithParentExt
+using Parent
+
+end

That diff introduces an extension "cycle" of the kind that doesn't exist on 1.11, but is a cycle on 1.10.

We don't even get to print our warning though:

./julia --project=test/project/Extensions/tempenv -q
(tempenv) pkg> dev ./test/project/Extensions/DepWithParentExt.jl/ ./test/project/Extensions/Parent.jl/
   Resolving package versions...
    Updating `~/repos/julia/test/project/Extensions/tempenv/Project.toml`
  [8a35c396] + DepWithParentExt v0.1.0 `../DepWithParentExt.jl`
  [58cecb9c] + Parent v0.1.0 `../Parent.jl`
    Updating `~/repos/julia/test/project/Extensions/tempenv/Manifest.toml`
  [8a35c396] + DepWithParentExt v0.1.0 `../DepWithParentExt.jl`
  [58cecb9c] + Parent v0.1.0 `../Parent.jl`

(tempenv) pkg> precompile
ERROR: KeyError: key "DepWithParentExt" not found
Stacktrace:
  [1] getindex
    @ ./dict.jl:498 [inlined]
  [2] precompile(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; internal_call::Bool, strict::Bool, warn_loaded::Bool, already_instantiated::Bool, timing::Bool, _from_loading::Bool, kwargs::@Kwargs{io::Base.TTY})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:1168
  [3] precompile(pkgs::Vector{Pkg.Types.PackageSpec}; io::Base.TTY, kwargs::@Kwargs{})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:159
  [4] precompile(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:148
  [5] precompile(pkgs::Vector{String})
    @ Pkg.API ~/repos/julia/usr/share/julia/stdlib/v1.10/Pkg/src/API.jl:147

[topolarity]

That second issue look like it's because we're only looking in weakdeps on 1.10: https://github.com/JuliaLang/Pkg.jl/blob/845909f49043c8c78ca2aebdcd9aee434ea70279/src/API.jl#L1168

instead of both weakdeps and deps: https://github.com/JuliaLang/julia/blame/94f542dcd2f67aa066fc17b08904125facc12c11/base/precompilation.jl#L187-L211

Another bug that was cleaned up with the new precompile code