I'm working to enable PowerShell as a login shell on *nix in PowerShell/PowerShell#10050.
When -Login or -l is passed, this works fine (we exec /bin/sh and then exec pwsh again).
But the convention in many *nix environments for login shells is to prepend a - onto the process name when it is exec'd (e.g. bash sees its own process name as -bash and then deduces it must run login shell logic).
With PowerShell as a .NET Core 3.0 application, I don't know how to access this information.
I've tried the args in public static int Main(string[] args), Environment.GetCommandLineArgs() and Process.GetCurrentProcess():
public static int Main(string[] args)
{
Console.WriteLine("ARGS");
foreach (string arg in args)
{
Console.WriteLine(arg);
}
Console.WriteLine("ENVIRONMENT ARGS");
foreach (string arg in Environment.GetCommandLineArgs())
{
Console.WriteLine(arg);
}
Console.WriteLine($"PROCESS NAME: {System.Diagnostics.Process.GetCurrentProcess().ProcessName}");
...
}Which from PowerShell prints when started as the default login shell on macOS:
ARGS
ENVIRONMENT ARGS
/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/powershell-unix/bin/Debug/netcoreapp3.0/osx-x64/publish/pwsh.dll
PROCESS NAME: pwsh
Writing a small C program to show the same (compiled with cc ex.c):
#include <stdio.h>
int main(int argc, char **argv)
{
for (int i = 0; i < argc; i++)
{
printf("%d: %s\n", i, argv[i]);
}
}When started as a login shell, prints:
The mechanism for this seems to be the login util, which prepends the - before exec-ing the given executable.
My question is: is there a way to detect the name with which a process has been started? Ideally we could do this performantly, since it's a startup time thing and we just want to detect it as fast as possible so we can exec another process.
I'm working to enable PowerShell as a login shell on *nix in PowerShell/PowerShell#10050.
When
-Loginor-lis passed, this works fine (we exec /bin/sh and then exec pwsh again).But the convention in many *nix environments for login shells is to prepend a
-onto the process name when it is exec'd (e.g.bashsees its own process name as-bashand then deduces it must run login shell logic).With PowerShell as a .NET Core 3.0 application, I don't know how to access this information.
I've tried the
argsinpublic static int Main(string[] args),Environment.GetCommandLineArgs()andProcess.GetCurrentProcess():Which from PowerShell prints when started as the default login shell on macOS:
Writing a small C program to show the same (compiled with
cc ex.c):When started as a login shell, prints:
The mechanism for this seems to be the
loginutil, which prepends the-before exec-ing the given executable.My question is: is there a way to detect the name with which a process has been started? Ideally we could do this performantly, since it's a startup time thing and we just want to detect it as fast as possible so we can exec another process.