Add scripts

2026-06-14 13:04:03 +02:00
commit bb83b30aa9
6 changed files with 548 additions and 0 deletions
--- a/common.sh
+++ b/common.sh
@@ -0,0 +1,117 @@
+#!/usr/bin/env bash
+# common.sh - shared helpers. Sourced by bootstrap.sh, not run directly.
+
+# Exported once so we never rely on the `$SUDO VAR=val cmd` pattern, which
+# breaks when $SUDO is empty (running as root): the var assignment gets parsed
+# before $SUDO expands, so `DEBIAN_FRONTEND=...` ends up treated as a command.
+export DEBIAN_FRONTEND=noninteractive
+
+# ---- colors / logging -------------------------------------------------------
+if [[ -t 1 ]]; then
+  C_RESET=$'\e[0m'; C_DIM=$'\e[2m'; C_RED=$'\e[31m'; C_GRN=$'\e[32m'
+  C_YLW=$'\e[33m'; C_BLU=$'\e[34m'; C_BOLD=$'\e[1m'
+else
+  C_RESET=""; C_DIM=""; C_RED=""; C_GRN=""; C_YLW=""; C_BLU=""; C_BOLD=""
+fi
+
+log()   { printf '%s[*]%s %s\n'  "$C_BLU" "$C_RESET" "$*"; }
+ok()    { printf '%s[+]%s %s\n'  "$C_GRN" "$C_RESET" "$*"; }
+warn()  { printf '%s[!]%s %s\n'  "$C_YLW" "$C_RESET" "$*" >&2; }
+err()   { printf '%s[x]%s %s\n'  "$C_RED" "$C_RESET" "$*" >&2; }
+die()   { err "$*"; exit 1; }
+step()  { printf '\n%s== %s ==%s\n' "$C_BOLD" "$*" "$C_RESET"; }
+
+# ---- privilege --------------------------------------------------------------
+# Sets $SUDO to "sudo" if not root, "" if root. Fails if neither works.
+detect_sudo() {
+  if [[ $EUID -eq 0 ]]; then
+    SUDO=""
+  elif command -v sudo >/dev/null 2>&1; then
+    SUDO="sudo"
+    # prime the credential cache early so prompts don't appear mid-run
+    $SUDO -v || die "sudo authentication failed"
+  else
+    die "not root and sudo not available"
+  fi
+}
+
+# ---- distro detection -------------------------------------------------------
+# Sets DISTRO_ID (debian/ubuntu/...), DISTRO_LIKE, DISTRO_CODENAME, PKG_MGR.
+detect_distro() {
+  [[ -r /etc/os-release ]] || die "/etc/os-release missing - unsupported system"
+  # shellcheck disable=SC1091
+  . /etc/os-release
+  DISTRO_ID="${ID:-unknown}"
+  # shellcheck disable=SC2034  # used in bootstrap.sh main()
+  DISTRO_LIKE="${ID_LIKE:-}"
+  DISTRO_CODENAME="${VERSION_CODENAME:-}"
+
+  if command -v apt-get >/dev/null 2>&1; then
+    PKG_MGR="apt"
+  elif command -v dnf >/dev/null 2>&1; then
+    PKG_MGR="dnf"
+  elif command -v pacman >/dev/null 2>&1; then
+    PKG_MGR="pacman"
+  else
+    die "no supported package manager found (apt/dnf/pacman)"
+  fi
+  ok "detected ${DISTRO_ID} ${DISTRO_CODENAME:-} (pkg: ${PKG_MGR})"
+}
+
+# ---- package helpers (apt-focused, dnf/pacman best-effort) ------------------
+APT_UPDATED=0
+pkg_refresh() {
+  case "$PKG_MGR" in
+    apt)
+      if [[ $APT_UPDATED -eq 0 ]]; then
+        log "apt-get update"
+        # a single broken third-party repo shouldn't abort the whole bootstrap;
+        # downstream installs will fail loudly if a needed pkg is truly missing.
+        $SUDO apt-get update -qq || warn "apt-get update reported errors (broken repo?) - continuing"
+        APT_UPDATED=1
+      fi
+      ;;
+    dnf)    $SUDO dnf -q makecache ;;
+    pacman) $SUDO pacman -Sy --noconfirm >/dev/null ;;
+  esac
+}
+
+# is a binary already on PATH?
+have() { command -v "$1" >/dev/null 2>&1; }
+
+# install one or more packages, skipping any already-present *packages*
+pkg_install() {
+  pkg_refresh
+  case "$PKG_MGR" in
+    apt)
+      $SUDO apt-get install -y -qq \
+        --no-install-recommends "$@" ;;
+    dnf)    $SUDO dnf install -y "$@" ;;
+    pacman) $SUDO pacman -S --needed --noconfirm "$@" ;;
+  esac
+}
+
+# install a package only if a given command is missing. usage: ensure_cmd <cmd> <pkg...>
+ensure_cmd() {
+  local cmd="$1"; shift
+  if have "$cmd"; then
+    printf '%s    - %s already present%s\n' "$C_DIM" "$cmd" "$C_RESET"
+    return 0
+  fi
+  log "installing ${cmd} (pkg: $*)"
+  pkg_install "$@"
+}
+
+# write file from stdin only if content differs (idempotent). usage: write_if_changed <path>
+write_if_changed() {
+  local target="$1" tmp
+  tmp="$(mktemp)"
+  cat > "$tmp"
+  if [[ -f "$target" ]] && cmp -s "$tmp" "$target"; then
+    rm -f "$tmp"
+    return 1   # unchanged
+  fi
+  $SUDO install -D -m "${2:-0644}" "$tmp" "$target"
+  rm -f "$tmp"
+  return 0     # changed
+}