analyse the rebuild tree for Yggdrasil

contrib/dependency_tree.jl

@@ -0,0 +1,94 @@
+using BinaryBuilder
+
+const PATH = dirname(@__DIR__)
+build_recipes = readlines(`find $(PATH) -name build_tarballs.jl`)
+
+function process_meta(file)
+    # Read in input `.json` file
+    json = String(read(file))
+    buff = IOBuffer(strip(json))
+    objs = []
+    while !eof(buff)
+        push!(objs, BinaryBuilder.JSON.parse(buff))
+    end
+
+    # Merge the multiple outputs into one
+    merged = BinaryBuilder.merge_json_objects(objs)
+    BinaryBuilder.cleanup_merged_object!(merged)
+    merged
+end
+
+metadata = Any[]
+failed = String[]
+
+for recipe in build_recipes
+    @info "Processing recipe..." recipe
+    try 
+        run(`$(Base.julia_cmd()) $recipe --meta-json=tmp.json`)
+        meta = process_meta("tmp.json")
+        rm("tmp.json")
+        push!(metadata, meta)
+    catch err
+        bt = catch_backtrace()
+        push!(failed, recipe)
+        @error "Processing failed..." recipe _ex=(err, bt)
+    end
+end
+
+Base.nameof(d::BinaryBuilder.AbstractDependency) = d.pkg.name
+function stages(metadata)
+
+    seen = Set{String}()
+    stages = Any[]
+    current = Any[]
+    next = Any[]
+    worklist = metadata
+
+    while true
+        changed = false
+        for pkg in worklist
+            dependencies = pkg["dependencies"]
+            name = "$(pkg["name"])_jll"
+
+            if all(d->in(nameof(d), seen), dependencies)
+                changed = true
+                push!(seen, name)
+                push!(current, pkg)
+            else
+                push!(next, pkg)
+            end
+        end
+        if !changed
+            if !isempty(next)
+                @error "Unsatisfiable dependencies or loop"
+            end
+            break
+        end
+        push!(stages, current)
+        worklist = next
+        current = Any[]
+        next = Any[]
+    end
+    return stages, next
+end
+
+function report(stages)
+    open("report.md", "w") do io
+        for (i, stage) in enumerate(stages)
+            println(io, "- Stage ", i, ":")
+            for pkg in stage
+                println(io, "  - `", pkg["name"], "`")
+            end
+        end
+    end
+end
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