chsh -s /snap/bin/powershell: powershell is an invalid shell

[RokeJulianLockhart]

RokeJulianLockhart@s1e8h4:~> chsh -s /snap/bin/powershell
Password: 
chsh: /snap/bin/powershell is an invalid shell

[237dmitry]

/snap/bin/powershell

powershell?

Is there pwsh in /etc/shells?

chsh --list-shells

[RokeJulianLockhart]

https://github.com/orgs/PowerShell/discussions/20962#discussioncomment-7934767

@237dmitry,

chsh --list-shells 

produces

/usr/bin/chsh: unrecognized option '--list-shells'
Usage: chsh [options] [LOGIN]

Options:
  -h, --help                    display this help message and exit
  -R, --root CHROOT_DIR         directory to chroot into
  -s, --shell SHELL             new login shell for the user account

(I'm using https://download.opensuse.org/repositories/openSUSE:/Factory/standard/x86_64/shadow-4.14.2-1.1.x86_64.rpm per rpm-software-management/mock#395 (comment)) but

Get-Content -LiteralPath '/etc/shells' 

produces

/bin/ash
/bin/bash
/bin/csh
/bin/dash
/bin/false
/bin/ksh
/bin/ksh93
/bin/mksh
/bin/pdksh
/bin/sh
/bin/tcsh
/bin/true
/bin/zsh
/usr/bin/csh
/usr/bin/dash
/usr/bin/ksh
/usr/bin/ksh93
/usr/bin/mksh
/usr/bin/passwd
/usr/bin/pdksh
/usr/bin/bash
/usr/bin/tcsh
/usr/bin/zsh
/usr/bin/fish
/usr/bin/scsh
/usr/bin/rash

[237dmitry]

From pwsh --help

-Login | -l:
  On Linux and macOS, starts PowerShell as a login shell, using /bin/sh to
  execute login profiles such as /etc/profile and ~/.profile.

  This parameter must come first to start PowerShell as a login shell. This
  parameter is ignored if it is passed in another position.

  To set up pwsh as the login shell:

  - Verify that the full absolute path to pwsh is listed under /etc/shells
    - This path is usually something like /opt/microsoft/powershell/7/pwsh on
      Linux or /usr/local/bin/pwsh on macOS
    - If pwsh isn't present in /etc/shells, use an editor to append the path
      to pwsh on the last line. This requires elevated privileges to edit.
  - Use the chsh utility to set your current user's shell to pwsh.

This is my personal opinion: Do not install PowerShell with snap unless there is no other option.

[rhubarb-geek-nz]

Linux defines what shells are available by looking in /etc/shells, eg

$ tail -5 /etc/shells
/usr/bin/ksh93
/bin/rksh93
/usr/bin/rksh93
/opt/microsoft/powershell/7/pwsh
/usr/bin/pwsh

The PowerShell rpm and deb packages manage this entry on installation and removal.

I believe that Snap packages are self-contained, so in theory should not be able to interfere with global configuration files.

[RokeJulianLockhart]

https://github.com/orgs/PowerShell/discussions/20962#discussioncomment-7937685

@237dmitry, I have consequently filed PowerShell/PowerShell-Snap#101 (comment).