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My personal environment sync

description:

keywords: programming

author: Yann Esposito

email: yann@esposito.host

gpg

date: [2021-10-30 Sat]

I have a quite specific system that I improved along the years to manage my

local environment.

Think about, binaries I expect to have in my shell, as well as

configuration files for various utilities, and a few personal scripts.

The notion of what is exactly my local environment is not perfectly defined.

I expect every of my computers to behave slightly differently.

Some are for work-only, some personal use only.

For the things I want everywhere, I have a peculiar personal system.

I use a personal script that depends on

yadm

and

home-manager

My script try to check if some files where updated and react accordingly:

1. I download the dot-files changes via =yadm=.

2. If my home-manager files changes, it will run ~home-manager switch~

; if it fails, try to update nix channels then try again.

3. If my doom emacs packages changed, it will run ~doom sync~

4. If the script itself changed, it re-run the script after updating itself.

If the script detect that I changed my emacs configuration, it runs ~doom

sync~ or ~doom sync -u~.

Here it is:

#!/bin/bash

### logs fn helpers

## colors for tput
# black=0
red=1
green=2
yellow=3
blue=4
# magenta=5
# cyan=6
# white=7
highpr() {
    printf "$(tput setaf $green)→$(tput sgr0) $(tput bold)%-60s$(tput sgr0)" "$*"
}
ok() {
    local txt="OK"
    echo -e " [$(tput bold)$(tput setaf $green)${txt}$(tput sgr0)]" >&2
}
info() {
    echo -e " [$(tput bold)$(tput setaf $blue)$*$(tput sgr0)]" >&2
}
warn() {
    echo -e "$(tput bold)$(tput setaf $yellow)$*$(tput sgr0)" >&2
}
err() {
    echo -e "$(tput bold)$(tput setaf $red)$*$(tput sgr0)" >&2
}
fail() {
    err -e "\n[ERR] $*"
    exit 1
}

highpr "check nix"
if ! [ -x "$(command -v nix)" ]; then
    echo
    err "nix does not seem to be installed."
    err "Install it from: https://nixos.org/nix/"
    exit 1
fi
ok

highpr "yadm fetch"
yadm fetch --quiet  || fail "yadm fetch failed"
ok

# check the hash of a few files before doing yadm pull
OLD_SYNC_ENV_ID=$(yadm rev-parse HEAD:bin/sync-env.sh)
OLD_HOME_MANAGER_ID=$(yadm rev-parse HEAD:.config/nixpkgs/home.nix)
OLD_DOOM_PACKAGES=$(yadm rev-parse HEAD:.doom.d/packages.el)
OLD_DOOM_INIT=$(yadm rev-parse HEAD:.doom.d/init.el)

highpr "yadm pull"
yadm pull --quiet || fail "yadm pull failed"
ok

# check the hash of a few files after doing yadm pull
NEW_SYNC_ENV_ID=$(yadm rev-parse HEAD:bin/sync-env.sh)
NEW_HOME_MANAGER_ID=$(yadm rev-parse HEAD:.config/nixpkgs/home.nix)
NEW_DOOM_PACKAGES=$(yadm rev-parse HEAD:.doom.d/packages.el)
NEW_DOOM_INIT=$(yadm rev-parse HEAD:.doom.d/init.el)

highpr "check sync-env diff"
if ! [ "$OLD_SYNC_ENV_ID" = "$NEW_SYNC_ENV_ID" ]; then
    warn " changed"
    warn " Starting ~/bin/sync-env.sh again"
    echo
    ~/bin/sync-env.sh
    exit $?
fi
ok

if [ -f "$HOME/.yadm/files.gpg" ]; then
  highpr "yadm decrypt"
  yadm decrypt || fail "yadm decrypt failed"
  ok
fi

highpr "home-manager"
USERNAME_NIX_FILE="$HOME/.config/nixpkgs/username.nix"
if [ ! -f  "$USERNAME_NIX_FILE" ]; then
  echo "\"$USER\"" >> "$USERNAME_NIX_FILE"
fi
if ! [ "$OLD_HOME_MANAGER_ID" = "$NEW_HOME_MANAGER_ID" ]; then
    echo
    highpr "home-manager switch"
    home-manager switch || \
      ( nix-channel --update && home-manager switch ) || \
      fail "home-manager switch failed"
    ok
else
    info "skipped"
fi

highpr "doom-emacs"
doompath="$HOME/.emacs.d/bin/doom"
if ! [ "$OLD_DOOM_PACKAGES" = "$NEW_DOOM_PACKAGES" ] || \
   ! [ "$OLD_DOOM_INIT"     = "$NEW_DOOM_INIT"  ]; then
  if =>  -x $doompath ; then
      echo
      highpr "doom sync"
      $doompath sync || fail "doom failed to sync"
      ok
  else
     fail "Cannot find doom executable at $doompath";
  fi
else
   info "skipped"
fi