install.fairie/home/.chezmoiscripts/universal/run_before_01-decrypt-age-key.tmpl

#!/usr/bin/env bash

{{ includeTemplate "universal/logg-before" }}
{{ includeTemplate "universal/profile-before" }}

### Only run decryption process if HEADLESS_INSTALL variable is not set
if [ -z "$HEADLESS_INSTALL" ]; then
  ### Install Age via Homebrew if not present
  if ! command -v age > /dev/null; then
    if command -v brew > /dev/null; then
      logg info 'Running `brew install age`'
      brew install age
    else
      logg warn '`age` is not installed which is utilized in the decryption process'
    fi
  fi

  ### Decrypt private key if it is not already present
  if command -v age > /dev/null; then
    if [ ! -f "${XDG_CONFIG_HOME}/age/chezmoi.txt" ]; then
      mkdir -p "${XDG_CONFIG_HOME}/age"
      logg star '`PRESS ENTER` if you have not set up your encryption token yet'
      age --decrypt --output "${XDG_CONFIG_HOME}/age/chezmoi.txt" "{{ .chezmoi.sourceDir }}/key.txt.age" || EXIT_CODE=$?
      if [ -n "$EXIT_CODE" ]; then
        logg info 'Proceeding without decrypting age encryption key stored at `~/.local/share/chezmoi/home/key.txt.age`'
        logg info 'To have Chezmoi handle your encryption (so you can store your private files publicly) take a look at https://shorturl.at/jkpzG'
        logg info 'Removing all files that begin with encrypted_ because decryption failed'
        find "$HOME/.local/share/chezmoi" -type f -name "encrypted_*" | while read ENCRYPTED_FILE; do
          logg info "Removing $ENCRYPTED_FILE"
          rm -f "$ENCRYPTED_FILE"
        done
      fi
    fi
  fi
fi

### Ensure proper permissions on private key
if [ -f "${XDG_CONFIG_HOME}/age/chezmoi.txt" ]; then
  logg info 'Ensuring proper permissions on Chezmoi / age decryption key'
  logg info 'Chezmoi / age decryption key is stored in '"${XDG_CONFIG_HOME}/age/chezmoi.txt"
  chmod 600 "${XDG_CONFIG_HOME}/age/chezmoi.txt"
fi