Path can't be null or whitespace even though it's declared with Linux Installer

[ErikDombi]

Installer CLI complains that the path is null despite it being declared.

Exiled.Installer@3.0.1.0
System.ArgumentException: Path cannot be the empty string or all whitespace. (Parameter 'path')
   at System.IO.Directory.CreateDirectory(String path)
   at Exiled.Installer.Program.MainSafe(CommandSettings args)
Read the exception message, read the readme, and if you still don't understand what to do, then contact #support in our discord server with the attached screenshot of the full exception```

Server is running Ubuntu 18.04, and SCP:SL is already installed. 

[nash-an]

Same issue happened with me. Ended up having to install EXILED manually. For reference it was on Debian 10 Buster.

[ErikDombi]

./Exiled.Installer-Linux --path /home/scp/SCP_Server --appdata /home/scp/SCP_Data initial command for reference

[joker-119]

Unless you have some special $PATH variables set, --appdata should remain the default of ~/.config since that's what the SCP server and Exiled will use to load configs/plugins/etc. --appdata command is only supposed to be used if you're using another user to install exiled than is used to run the server, but it should always end in .config

As for the error itself, that really shouldn't happen. I'm also not sure if the 3.0.1 installer supported the --appdata argument, i believe that was added in 3.1, if that's the case, that may be the cause of your issue.

[ErikDombi]

Command doesn't work without --appdata parameter either

[ErikDombi]

More detailed stacktrace with the latest release

Unhandled exception. System.ArgumentException: The path is empty. (Parameter 'path')
   at System.IO.Path.GetFullPath(String path)
   at System.IO.DirectoryInfo..ctor(String path)
   at Exiled.Installer.CommandSettings.<>c.<.cctor>b__31_1()
   at System.CommandLine.Argument`1.<>c__DisplayClass3_0.<.ctor>b__0()
   at System.CommandLine.Argument.<>c__DisplayClass29_0.<SetDefaultValueFactory>b__0(ArgumentResult _)
   at System.CommandLine.Argument.GetDefaultValue(ArgumentResult argumentResult)
   at System.CommandLine.Parsing.ArgumentResult.Convert(IArgument argument)
   at System.CommandLine.Parsing.ArgumentResult.GetArgumentConversionResult()
   at System.CommandLine.Parsing.ParseResultVisitor.ValidateArgumentResult(ArgumentResult argumentResult)
   at System.CommandLine.Parsing.ParseResultVisitor.ValidateOptionResult(OptionResult optionResult)
   at System.CommandLine.Parsing.ParseResultVisitor.Stop(SyntaxNode node)
   at System.CommandLine.Parsing.SyntaxVisitor.Visit(SyntaxNode node)
   at System.CommandLine.Parsing.Parser.Parse(IReadOnlyList`1 arguments, String rawInput)
   at System.CommandLine.CommandExtensions.GetInvocationPipeline(Command command, String[] args)
   at System.CommandLine.CommandExtensions.InvokeAsync(Command command, String[] args, IConsole console)
   at Exiled.Installer.CommandSettings.Parse(String[] args)
   at Exiled.Installer.Program.Main(String[] args)
   at Exiled.Installer.Program.<Main>(String[] args)
Aborted (core dumped)```

[iRebbok]

@wickedlizerd Could you write the full path of your directory and test Exiled.Installer-Linux --help, it should show the current folder as the default in the path argument.

This issue seems strange to me, because I shouldn't pass an null path. And if this were indeed the case, then I'd get an ArgumentNullReference exception on the path validation for Assembly-CSharp.dll, but as I see from the exception, this didn't happen, and the path validation was successful. It falls at this point if I got correctly.

[ErikDombi]

--help output

Usage:
  Exiled.Installer-Linux [options] [[--] <additional arguments>...]]

Unhandled exception. System.ArgumentException: The path is empty. (Parameter 'path')
   at System.IO.Path.GetFullPath(String path)
   at System.IO.DirectoryInfo..ctor(String path)
   at Exiled.Installer.CommandSettings.<>c.<.cctor>b__31_1()
   at System.CommandLine.Argument`1.<>c__DisplayClass3_0.<.ctor>b__0()
   at System.CommandLine.Argument.<>c__DisplayClass29_0.<SetDefaultValueFactory>b__0(ArgumentResult _)
   at System.CommandLine.Argument.GetDefaultValue(ArgumentResult argumentResult)
   at System.CommandLine.Argument.GetDefaultValue()
   at System.CommandLine.Help.HelpBuilder.DefaultValueHint(IArgument argument, Boolean isSingleArgument)
   at System.CommandLine.Help.HelpBuilder.<>c__DisplayClass40_0.<GetOptionHelpItems>b__7(IArgument argument)
   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.String.Join(String separator, IEnumerable`1 values)
   at System.CommandLine.Help.HelpBuilder.<GetOptionHelpItems>g__BuildDefaultValueHint|40_6(IEnumerable`1 arguments)
   at System.CommandLine.Help.HelpBuilder.GetOptionHelpItems(ISymbol symbol)+MoveNext()
   at System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext()
   at System.Linq.Set`1.UnionWith(IEnumerable`1 other)
   at System.Linq.Enumerable.DistinctIterator`1.FillSet()
   at System.Linq.Enumerable.DistinctIterator`1.ToArray()
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at System.CommandLine.Help.HelpBuilder.AddOptions(ICommand command)
   at System.CommandLine.Help.HelpBuilder.Write(ICommand command)
   at System.CommandLine.Invocation.HelpResult.Apply(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.GetResultCode(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.InvokeAsync(IConsole console)
   at System.CommandLine.CommandExtensions.InvokeAsync(Command command, String[] args, IConsole console)
   at Exiled.Installer.CommandSettings.Parse(String[] args)
   at Exiled.Installer.Program.Main(String[] args)
   at Exiled.Installer.Program.<Main>(String[] args)
Aborted (core dumped)```

[iRebbok]

And then send your current path from where you run Exiled.Installer.

[ErikDombi]

Current path is /home/scp/server Full tree of the directory https://pastebin.com/raw/TyzNmesQ

[ErikDombi]

Issue seems to be caused by Environment.SpecialFolder.ApplicationData being null.

[iRebbok]

^^^

Because it wasn't created, I'll do a PR that will check it.

[joker-119]

Fix staged for next update.