Change refs/* to refs/heads/* to speed up repo cloning w/ many branches

[quinnj]

Fixes #2329. Fix suggested by @staticfloat and discussed with @KristofferC. I've tested this only on the command in the #2329 issue and it makes the Pkg.add much much faster (like 5-10 seconds vs. several minutes).

[quinnj]

Hmmmm, unfortunately I dont' know anything about this code, so not sure what this test failure means:

update: package state changes: Test Failed at /home/runner/work/Pkg.jl/Pkg.jl/test/new.jl:1461
  Expression: pkg.version == v"0.3.0"
   Evaluated: v"0.2.0" == v"0.3.0"
Stacktrace:
  [1] (::Main.PkgTests.NewTests.var"#430#451")(pkg::Pkg.API.PackageInfo)
    @ Main.PkgTests.NewTests ~/work/Pkg.jl/Pkg.jl/test/new.jl:1461
  [2] dependencies
    @ ~/work/Pkg.jl/Pkg.jl/src/API.jl:90 [inlined]
  [3] (::Main.PkgTests.NewTests.var"#427#448")(tempdir::String)
    @ Main.PkgTests.NewTests ~/work/Pkg.jl/Pkg.jl/test/new.jl:1459
  [4] mktempdir(fn::Main.PkgTests.NewTests.var"#427#448", parent::String; prefix::String)
    @ Base.Filesystem ./file.jl:732
  [5] mktempdir
    @ ./file.jl:730 [inlined]
  [6] #426
    @ ~/work/Pkg.jl/Pkg.jl/test/new.jl:1425 [inlined]
  [7] (::Main.PkgTests.Utils.var"#4#7"{Bool, Main.PkgTests.NewTests.var"#426#447"})()
    @ Main.PkgTests.Utils ~/work/Pkg.jl/Pkg.jl/test/utils.jl:53
  [8] withenv(::Main.PkgTests.Utils.var"#4#7"{Bool, Main.PkgTests.NewTests.var"#426#447"}, ::Pair{String, Nothing}, ::Vararg{Pair{String, Nothing}})
    @ Base ./env.jl:161
  [9] isolate(fn::Main.PkgTests.NewTests.var"#426#447"; loaded_depot::Bool)
    @ Main.PkgTests.Utils ~/work/Pkg.jl/Pkg.jl/test/utils.jl:44
 [10] macro expansion
    @ ~/work/Pkg.jl/Pkg.jl/test/new.jl:1425 [inlined]
 [11] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1152 [inlined]
 [12] top-level scope
    @ ~/work/Pkg.jl/Pkg.jl/test/new.jl:1384

[staticfloat]

In that test, we first create a git repo with a package in it:

https://github.com/JuliaLang/Pkg.jl/blob/master/test/new.jl#L1426

We ensure it is of the expected version, then we bump it and commit that new version:

https://github.com/JuliaLang/Pkg.jl/blob/master/test/new.jl#L1438-L1443

Then we Pkg.update() and see if the changes have taken effect:

https://github.com/JuliaLang/Pkg.jl/blob/master/test/new.jl#L1459-L1465

This makes me think that the refs/* somehow catches an update that refs/heads/* doesn't. Perhaps the way that tracking is setup within a git repository on file remotes is different than on HTTPS remotes?

[DilumAluthge]

I think that in addition to refs/heads/*, you'll also need refs/remotes/* or something like that?

[quinnj]

I'm not sure I'll have the time/skills to do much more on this soon, so if anyone would be willing to pick it up in the meantime, I'd appreciate it.