#!/usr/bin/env sh
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set -eu
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if [ "$#" -ne 4 ]; then
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printf '%s\n' 'Usage: replace-plugin-directory.sh ARCHIVE TARGET INSTALL_DIR BACKUP_DIR' >&2
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exit 2
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fi
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ARCHIVE=$1
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TARGET_DIR=$2
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INSTALL_DIR=$3
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BACKUP_DIR=$4
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for directory in "$TARGET_DIR" "$INSTALL_DIR" "$BACKUP_DIR"; do
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case "$directory" in
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/*) ;;
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*)
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printf '%s\n' 'Plugin replacement directories must be absolute paths' >&2
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exit 2
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;;
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esac
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if [ "$directory" = / ]; then
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printf '%s\n' 'Plugin replacement directories cannot be the filesystem root' >&2
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exit 2
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fi
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done
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TARGET_PARENT=$(dirname -- "$TARGET_DIR")
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if [ "$(dirname -- "$INSTALL_DIR")" != "$TARGET_PARENT" ] || [ "$(dirname -- "$BACKUP_DIR")" != "$TARGET_PARENT" ]; then
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printf '%s\n' 'Plugin staging and backup directories must share the target parent' >&2
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exit 2
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fi
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if [ "$TARGET_DIR" = "$INSTALL_DIR" ] || [ "$TARGET_DIR" = "$BACKUP_DIR" ] || [ "$INSTALL_DIR" = "$BACKUP_DIR" ]; then
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printf '%s\n' 'Plugin replacement directories must be distinct' >&2
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exit 2
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fi
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if [ ! -f "$ARCHIVE" ]; then
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printf '%s\n' "Plugin archive does not exist: $ARCHIVE" >&2
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exit 2
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fi
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had_target=0
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cleanup() {
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status=$?
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trap - EXIT HUP INT TERM
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if [ "$status" -ne 0 ] && [ "$had_target" -eq 1 ] && [ ! -e "$TARGET_DIR" ] && [ -e "$BACKUP_DIR" ]; then
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mv "$BACKUP_DIR" "$TARGET_DIR" || true
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fi
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rm -rf "$INSTALL_DIR"
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if [ "$status" -eq 0 ]; then
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rm -rf "$BACKUP_DIR"
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fi
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exit "$status"
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}
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trap cleanup EXIT
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trap 'exit 1' HUP INT TERM
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rm -rf "$INSTALL_DIR"
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if [ -e "$BACKUP_DIR" ]; then
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printf '%s\n' "Plugin backup directory already exists: $BACKUP_DIR" >&2
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exit 1
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fi
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mkdir -p "$INSTALL_DIR"
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unzip -q "$ARCHIVE" -d "$INSTALL_DIR"
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if [ -e "$TARGET_DIR" ]; then
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mv "$TARGET_DIR" "$BACKUP_DIR"
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had_target=1
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fi
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mv "$INSTALL_DIR" "$TARGET_DIR"
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rm -rf "$BACKUP_DIR"
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had_target=0
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