`isdir` should not query group gid

[simeonschaub]

I'm getting the following error when trying to precompile GeoIO on a cluster with many users:

ERROR: LoadError: SystemError: getgrgid: Numerical result out of range
Stacktrace:
  [1] systemerror(p::Symbol, errno::Int32; extrainfo::Nothing)
    @ Base ./error.jl:176
  [2] systemerror
    @ ./error.jl:175 [inlined]
  [3] FilePathsBase.Group(gid::UInt64)
    @ FilePathsBase ~/.julia/packages/FilePathsBase/Laclt/src/libc.jl:125
  [4] Status
    @ ~/.julia/packages/FilePathsBase/Laclt/src/status.jl:21 [inlined]
  [5] stat(fp::FilePathsBase.PosixPath)
    @ FilePathsBase ~/.julia/packages/FilePathsBase/Laclt/src/system.jl:54
  [6] mode
    @ ~/.julia/packages/FilePathsBase/Laclt/src/system.jl:68 [inlined]
  [7] isdir
    @ ~/.julia/packages/FilePathsBase/Laclt/src/system.jl:96 [inlined]
  [8] Parquet2.FileManager(p::FilePathsBase.PosixPath, opts::Parquet2.ReadOptions)
    @ Parquet2 ~/.julia/packages/Parquet2/R3pbE/src/files.jl:127
  [9] Parquet2.Dataset(p::FilePathsBase.PosixPath; kw::@Kwargs{})
    @ Parquet2 ~/.julia/packages/Parquet2/R3pbE/src/dataset.jl:112
 [10] Parquet2.Dataset(p::FilePathsBase.PosixPath)
    @ Parquet2 ~/.julia/packages/Parquet2/R3pbE/src/dataset.jl:110
 [11] Parquet2.Dataset(p::String; kw::@Kwargs{})
    @ Parquet2 ~/.julia/packages/Parquet2/R3pbE/src/dataset.jl:116
 [12] Dataset
    @ ~/.julia/packages/Parquet2/R3pbE/src/dataset.jl:116 [inlined]
 [13] read(::GeoParquet.Parquet2Driver, fn::String; kwargs::@Kwargs{})
    @ GeoParquet ~/.julia/packages/GeoParquet/lUyaD/src/io.jl:50
 [14] read
    @ ~/.julia/packages/GeoParquet/lUyaD/src/io.jl:49 [inlined]
 [15] read(fn::String; driver::Nothing, kwargs::@Kwargs{})
    @ GeoParquet ~/.julia/packages/GeoParquet/lUyaD/src/io.jl:69
 [16] read
    @ ~/.julia/packages/GeoParquet/lUyaD/src/io.jl:66 [inlined]
 [17] load(fname::String; repair::Bool, layer::Int64, lenunit::Nothing, numbertype::Type, kwargs::@Kwargs{})
    @ GeoIO ~/.julia/packages/GeoIO/29FWh/src/load.jl:156
 [18] load(fname::String)
    @ GeoIO ~/.julia/packages/GeoIO/29FWh/src/load.jl:81
 [19] macro expansion
    @ ~/.julia/packages/GeoIO/29FWh/src/precompile.jl:12 [inlined]
 [20] macro expansion
    @ ~/.julia/packages/PrecompileTools/L8A3n/src/workloads.jl:78 [inlined]
 [21] macro expansion
    @ ~/.julia/packages/GeoIO/29FWh/src/precompile.jl:5 [inlined]
 [22] macro expansion
    @ ~/.julia/packages/PrecompileTools/L8A3n/src/workloads.jl:140 [inlined]
 [23] top-level scope
    @ ~/.julia/packages/GeoIO/29FWh/src/precompile.jl:139
 [24] include(mod::Module, _path::String)
    @ Base ./Base.jl:557
 [25] include(x::String)
    @ GeoIO ~/.julia/packages/GeoIO/29FWh/src/GeoIO.jl:5
 [26] top-level scope
    @ ~/.julia/packages/GeoIO/29FWh/src/GeoIO.jl:139
 [27] include
    @ ./Base.jl:557 [inlined]
 [28] include_package_for_output(pkg::Base.PkgId, input::String, depot_path::Vector{String}, dl_load_path::Vector{String}, load_path::Vector{String}, concrete_deps::Vector{Pair{Base.PkgId, UInt128}}, source::Nothing)
    @ Base ./loading.jl:2881
 [29] top-level scope
    @ stdin:6
in expression starting at /home/kit/stud/uwgir/.julia/packages/GeoIO/29FWh/src/precompile.jl:3
in expression starting at /home/kit/stud/uwgir/.julia/packages/GeoIO/29FWh/src/GeoIO.jl:5
in expression starting at stdin:

This seems to be a general issue with getgrgid (see also dun/munge#16), but getgrgid should probably not be called at all for a simple isdir query.

The culprit here is that constructing a Status struct tries to create a Group which in turn calls getgrgid. Any reason for

FilePathsBase.jl/src/system.jl

Line 97 in 8b18030

Base.isdir(fp::SystemPath) = isdir(mode(fp))

not to just call isdir(string(fp)) which would avoid the issue?