Can neither add nor remove a corrupted registry

[fonsp]

My registry is corrupted, likely because I interrupted during an update:

% cd .julia/registries 
% ls
General
% cd General 
% ls
A	B	C	D	E	F

Note that the folder exists, with some contents, but the Registry.toml file does not.

The point of this issue is: I tried to fix it using the registry REPL commands, but none of them work:

(@v1.5) pkg> registry rm General
registry `General` not found.

(@v1.5) pkg> registry up General
registry `General` not found.

(@v1.5) pkg> registry add General
######################################################################## 100,0%
ERROR: SystemError: opening file "/Users/fons/.julia/registries/General/Registry.toml": No such file or directory
Stacktrace:
 [1] systemerror(::String, ::Int32; extrainfo::Nothing) at ./error.jl:168
 [2] #systemerror#48 at ./error.jl:167 [inlined]
 [3] systemerror at ./error.jl:167 [inlined]
 [4] open(::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Nothing, append::Nothing) at ./iostream.jl:284
 [5] open at ./iostream.jl:273 [inlined]
 [6] open(::Base.var"#294#295"{Tuple{}}, ::String; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at ./io.jl:323
 [7] open at ./io.jl:323 [inlined]
 [8] read at ./io.jl:408 [inlined]
 [9] parsefile at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/ext/TOML/src/TOML.jl:50 [inlined]
 [10] read_registry(::String; cache::Bool) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:1044
 [11] read_registry at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:1039 [inlined]
 [12] (::Pkg.Types.var"#94#97"{Pkg.Types.Context,String,Pkg.Types.RegistrySpec})(::String) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:1016
 [13] mktempdir(::Pkg.Types.var"#94#97"{Pkg.Types.Context,String,Pkg.Types.RegistrySpec}, ::String; prefix::String) at ./file.jl:709
 [14] mktempdir at ./file.jl:707 [inlined] (repeats 2 times)
 [15] clone_or_cp_registries(::Pkg.Types.Context, ::Array{Pkg.Types.RegistrySpec,1}, ::String) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:980
 [16] clone_or_cp_registries at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:973 [inlined]
 [17] #add#6 at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Registry.jl:32 [inlined]
 [18] add at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Registry.jl:28 [inlined]
 [19] #add#5 at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Registry.jl:26 [inlined]
 [20] add(::Array{Pkg.Types.RegistrySpec,1}) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Registry.jl:26
 [21] do_cmd!(::Pkg.REPLMode.Command, ::REPL.LineEditREPL) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/REPLMode/REPLMode.jl:404
 [22] do_cmd(::REPL.LineEditREPL, ::String; do_rethrow::Bool) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/REPLMode/REPLMode.jl:382
 [23] do_cmd at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/REPLMode/REPLMode.jl:377 [inlined]
 [24] (::Pkg.REPLMode.var"#24#27"{REPL.LineEditREPL,REPL.LineEdit.Prompt})(::REPL.LineEdit.MIState, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Bool) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/REPLMode/REPLMode.jl:546
 [25] #invokelatest#1 at ./essentials.jl:710 [inlined]
 [26] invokelatest at ./essentials.jl:709 [inlined]
 [27] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/REPL/src/LineEdit.jl:2355
 [28] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/REPL/src/REPL.jl:1144
 [29] (::REPL.var"#38#42"{REPL.LineEditREPL,REPL.REPLBackendRef})() at ./task.jl:356

EDIT: It looks like Pkg tried to install the General registry when installing a package, that's great! But it fails for the same reason:

(@v1.5) pkg> add JSON
  Resolving package versions...
 Installing known registries into `~/.julia`
######################################################################## 100,0%
ERROR: SystemError: opening file "/Users/fons/.julia/registries/General/Registry.toml": No such file or directory
Stacktrace:

[same as above]

[KristofferC]

Will be fixed in 1.6 (the cause of the corruption has been fixed). You can remove the folder for now.

[fonsp]

Great to hear that the corruption has been fixed! That removes my stake in this issue, same with #2017

Still, it seems like a bug that Pkg.add("JSON") will:

1. Detect that there are no registries
2. Add the General registry
3. Attempt reading the file .julia/registries/General/Registry.toml

But feel free to close this issue anyhow

[KristofferC]

I think that issue, in particular, should be fixed by #2356.