Some variables from .chezmoi.config are still inaccessible in templates

[juliuswz]

Describe the bug

After digging into #2940, #2942, and #2943, I am still encountering issues with the .chezmoi.config template variables being inaccessible.

It seems that not all variables are accessible, such as identity from age.

To reproduce

.chezmoi.toml.tmpl:

{{- $identity := promptStringOnce . ".chezmoi.config.age.identity" "Encryption key path (age)" -}}

encryption = "age"

[age]
identity = {{ $identity | quote }}
symmetric = true

chezmoi init output:

chezmoi: template: chezmoi.toml:11:17: executing "chezmoi.toml" at <promptStringOnce . ".chezmoi.config.age.identity" "Encryption key path (age)">: error calling promptStringOnce: empty path element at index 0

The error occurs even if I pre-populate ~/.config/chezmoi/chezmoi.toml:

encryption = "age"

[age]
identity = "~/some/path"
symmetric = true

Expected behavior

$ chezmoi execute-template '{{ .chezmoi.config.age.identity }}'
~/some/path

Additional context

Even the chezmoi data command does not return the values:

"age": {
        "args": null,
        "command": "age",
        "identities": null,
        "identity": {},
        "passphrase": false,
        "recipient": "",
        "recipients": null,
        "recipientsFile": {},
        "recipientsFiles": null,
        "suffix": ".age",
        "symmetric": true,
        "useBuiltin": false
      }

$ chezmoi --version 
chezmoi version v2.46.1, built at 2024-02-12T09:19:56Z

[twpayne]

Re:

{{- $identity := promptStringOnce . ".chezmoi.config.age.identity" "Encryption key path (age)" -}}

I think this should be

{{- $identity := promptStringOnce . "chezmoi.config.age.identity" "Encryption key path (age)" -}}

i.e. remove the leading .. The second argument to promptStringOnce is a path to a field in an object, not a template expression.

[twpayne]

Sorry, there is also a bug in chezmoi. It is the same bug as #3593.