first commit

lib/common.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+#
+# Purpose : Paths, settings and helpers shared by coredesktop-dev's scripts
+
+# The deployed copy: the machine's running CoreDesktop, which update pulls
+COREDESKTOP="$HOME/.local/share/coredesktop"
+
+CONFIG_DIR="$HOME/.config/coredesktop-dev"
+CONFIG="$CONFIG_DIR/config"
+
+# First line after the shebang of the pre-push hook this project installs, so it
+# never overwrites or removes a hook someone else wrote
+HOOK_MARKER="# Installed by coredesktop-dev; remove with: coredesktop-dev hooks remove"
+
+die() {
+  echo "$*" >&2
+  exit 1
+}
+
+confirm() {
+  local answer
+  read -rp "$1 [y/N] " answer
+  [[ "$answer" == [yY]* ]]
+}
+
+# Sets WORKING_COPY from the settings file (empty if there is none)
+load_config() {
+  WORKING_COPY=""
+  # shellcheck source=/dev/null
+  [ -f "$CONFIG" ] && source "$CONFIG"
+  return 0
+}
+
+save_config() {
+  mkdir -p "$CONFIG_DIR"
+  printf 'WORKING_COPY=%q\n' "$1" > "$CONFIG"
+}
+
+# True if DIR is the deployed copy, however it's spelled
+is_deployed_copy() {
+  [ -e "$1" ] && [ "$(realpath "$1")" = "$(realpath "$COREDESKTOP" 2> /dev/null)" ]
+}
+
+# True if DIR is the top of a git clone of CoreDesktop
+is_coredesktop_clone() {
+  [ -d "$1" ] \
+    && [ "$(git -C "$1" rev-parse --show-toplevel 2> /dev/null)" = "$(realpath "$1")" ] \
+    && [ -f "$1/update" ] && [ -d "$1/updates.d" ]
+}
+
+# Load the settings and stop unless they point at a CoreDesktop clone
+require_working_copy() {
+  load_config
+  [ -n "$WORKING_COPY" ] \
+    || die "No working copy is set. Run $(sibling_dir)/install.sh, or: sibling add <coredesktop-dev url>"
+  is_coredesktop_clone "$WORKING_COPY" \
+    || die "The working copy, $WORKING_COPY, isn't a clone of CoreDesktop (set in $CONFIG)."
+}
+
+in_flatpak() {
+  [ -f /.flatpak-info ] || [ -n "${FLATPAK_ID:-}" ]
+}
+
+# This project's folder
+sibling_dir() {
+  cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd
+}