Is it possible to use a template in a run_once* file name?

[0xjams]

I don't know if I'm overcomplicating this, but I want to bootstrap my environment in either Windows or Linux.
I have this file run_once_install_ansible.sh.tmpl. However, that file will not run as Powershell, so I was wondering if something like this is possible: run_once_install_ansible{{ if eq .chezmoi.os "windows" }}.ps1{{ else }}.sh{{ end }}.tmpl

Another option I was considering is to use .chezmoiignore to have a .sh and a PowerShell template for each OS so that only the run_once* file that corresponds to the OS gets copied. But I'm not sure if .chezmoiignore works for run* files.

What's the commonly used approach?

[Lockszmith-GH]

Did a quick search for chezmoiignore and chezmoiscripts and found #2510

I then tested it like this in PowerShell:

> Set-Location "$(chezmoi source-path)"
### Create the two flavors of run_once_script that will alternate based on os
> mkdir .chezmoiscripts
> '"Hello World! PS1"' > .chezmoiscripts/run_once_script.ps1
> '#!/bin/bash'+"`n"+'echo "Hello World! sh"' > .chezmoiscripts/run_once_script.sh
### test it out - what's managed, what's ignored
> chezmoi ignored

> chezmoi managed
.chezmoiscripts/script.ps1
.chezmoiscripts/script.sh

### add template pattern to .chezmoiignore
> '.chezmoiscripts/script{{ if eq .chezmoi.os "windows" }}.sh{{ else }}.ps1{{ end }}' >> .chezmoiignore
### Test the tempalte syntax (on windows - the .sh should be ignored)
> Get-Content .chezmoiignore | chezmoi.exe execute-template
.chezmoiscripts/script.sh

### test again, this time with the .chezmoiignore entry in place
> chezmoi ignored
.chezmoiscripts/script.sh

> chezmoi managed
.chezmoiscripts/script.ps1

I'm guessing this is what you were asking for. Good Luck

[twpayne]

I was wondering if something like this is possible: run_once_install_ansible{{ if eq .chezmoi.os "windows" }}.ps1{{ else }}.sh{{ end }}.tmpl

No, it's not currently possible to templatize filenames. Use .chezmoiignore as @Lockszmith-GH says.