add update.sh; sync live system state from /etc/portage into repo

1 files changed, 167 insertions, 0 deletions

diff --git a/update.sh b/update.sh
new file mode 100755
index 0000000..8a7d108
--- /dev/null
+++ b/update.sh
@@ -0,0 +1,167 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+QUICK=no
+DO_COMMIT=no
+INSTALL_HOOK=no
+DRY_RUN=no
+
+usage() {
+  cat <<EOF
+Sync live system state back into the dotfiles repo.
+
+Usage: $0 [options]
+
+  -q, --quick        non-interactive, minimal output (used by postsync hook)
+  -c, --commit       git add -A && git commit after syncing
+  -h, --hook-install write /etc/portage/postsync.d hook (auto after each emerge)
+  -n, --dry-run      show what would change without copying
+  --help             show this help
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -q|--quick) QUICK=yes ;;
+    -c|--commit) DO_COMMIT=yes ;;
+    -h|--hook-install) INSTALL_HOOK=yes ;;
+    -n|--dry-run) DRY_RUN=yes ;;
+    --help) usage; exit 0 ;;
+    *) echo "unknown option: $1" >&2; usage >&2; exit 2 ;;
+  esac
+  shift
+done
+
+log()  { printf '\033[1;32m[sync]\033[0m %s\n' "$*"; }
+warn() { printf '\033[1;33m[warn]\033[0m %s\n' "$*"; }
+
+root_cp() {
+  if [[ "$DRY_RUN" == "yes" ]]; then
+    log "  would copy $1 -> $2"
+    return 0
+  fi
+  if [[ $EUID -eq 0 ]]; then
+    cp "$1" "$2"
+  elif cp "$1" "$2" 2>/dev/null; then
+    :   # readable as current user — done
+  elif command -v sudo >/dev/null 2>&1; then
+    sudo cp "$1" "$2"
+  else
+    warn "need root to copy $1"
+    return 1
+  fi
+}
+
+rsync_portage() {
+  # -L: dereference symlinks so /etc/portage symlinks back into the repo
+  #     are copied as content, never re-created as self-referencing symlinks.
+  # Broken symlinks are excluded (rsync -L aborts on dangling referents).
+  local exfile
+  exfile="$(mktemp)"
+  printf '.gitkeep\nmake.profile\n' > "$exfile"
+  find /etc/portage -type l ! -exec test -e {} \; -printf '%P\n' >> "$exfile"
+
+  local -a opts=(-aL --delete "--exclude-from=$exfile")
+  [[ "$DRY_RUN" == "yes" ]] && opts+=(-n)
+  log "portage /etc/portage -> repo/portage/etc/portage"
+  rsync "${opts[@]}" /etc/portage/ "$REPO_DIR/portage/etc/portage/"
+  rm -f "$exfile"
+}
+
+sync_portage() {
+  rsync_portage
+
+  if [[ -e /etc/portage/make.profile ]]; then
+    log "profile: $(readlink /etc/portage/make.profile)"
+    if [[ "$DRY_RUN" != "yes" ]]; then
+      printf '%s\n' "$(readlink /etc/portage/make.profile)" > "$REPO_DIR/portage/PROFILE"
+    else
+      log "  would write: portage/PROFILE"
+    fi
+  fi
+
+  log "world /var/lib/portage/world -> repo"
+  if [[ -L /var/lib/portage/world ]] \
+     && [[ "$(readlink -f /var/lib/portage/world)" == "$REPO_DIR/portage/var/lib/portage/world" ]]; then
+    log "  already a symlink into the repo — no copy needed"
+  else
+    root_cp /var/lib/portage/world "$REPO_DIR/portage/var/lib/portage/world"
+  fi
+
+  if [[ -s /var/lib/portage/world_sets ]]; then
+    log "world_sets /var/lib/portage/world_sets -> repo"
+    root_cp /var/lib/portage/world_sets "$REPO_DIR/portage/var/lib/portage/world_sets"
+  fi
+}
+
+sync_system() {
+  log "fstab /etc/fstab -> repo/fstab/etc/fstab"
+  root_cp /etc/fstab "$REPO_DIR/fstab/etc/fstab"
+
+  if [[ -f /etc/greetd/config.toml ]]; then
+    log "greetd /etc/greetd/config.toml -> repo/config.toml"
+    root_cp /etc/greetd/config.toml "$REPO_DIR/config.toml"
+  fi
+}
+
+install_hook() {
+  local hook=/etc/portage/postsync.d/update-dotfiles
+  if [[ "$DRY_RUN" == "yes" ]]; then
+    log "  would write: $hook"
+    return 0
+  fi
+  log "writing $hook"
+  if [[ $EUID -eq 0 ]]; then
+    mkdir -p /etc/portage/postsync.d
+    cat > "$hook" <<EOF
+#!/usr/bin/env bash
+# generated by update.sh --hook-install — keeps dotfiles fresh after each emerge
+exec "$REPO_DIR/update.sh" --quick
+EOF
+    chmod +x "$hook"
+  elif command -v sudo >/dev/null 2>&1; then
+    sudo tee "$hook" >/dev/null <<EOF
+#!/usr/bin/env bash
+# generated by update.sh --hook-install — keeps dotfiles fresh after each emerge
+exec "$REPO_DIR/update.sh" --quick
+EOF
+    sudo chmod +x "$hook"
+  else
+    warn "need root to write $hook"
+  fi
+}
+
+commit() {
+  cd "$REPO_DIR"
+  if [[ -n "$(git status --porcelain)" ]]; then
+    git add -A
+    git commit -q -m "sync system state: $(date '+%Y-%m-%d %H:%M')"
+    log "committed."
+  else
+    log "nothing to commit."
+  fi
+}
+
+main() {
+  if [[ "$DRY_RUN" == "yes" ]]; then
+    log "dry-run mode — showing changes, nothing written"
+  fi
+  sync_portage
+  sync_system
+  [[ "$INSTALL_HOOK" == "yes" ]] && install_hook
+
+  if [[ "$DO_COMMIT" == "yes" ]]; then
+    commit
+  elif [[ "$DRY_RUN" != "yes" && "$QUICK" != "yes" ]]; then
+    cd "$REPO_DIR"
+    if [[ -n "$(git status --porcelain)" ]]; then
+      warn "dotfiles changed — review and commit (or rerun with --commit)."
+      git status --short
+    else
+      log "repo is up to date."
+    fi
+  fi
+}
+
+main "$@"
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