Fix remote one-line install failing under process substitution

Skip local path resolution when install.sh runs via bash <(curl ...),
so resolve_src falls through to cloning instead of aborting on /dev/fd.

Co-authored-by: Frank Vitrano <WHC2006@users.noreply.github.com>

install.sh

@@ -75,12 +75,23 @@ install_deps() {
 
 # Resolve source tree: current repo, or clone to temp
 resolve_src() {
-	local here
-	here=$(cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")" && pwd)
-	if [[ -f $here/miaur && -d $here/lib ]]; then
-		SRC=$here
-		return 0
-	fi
+	local src=${BASH_SOURCE[0]}
+	local here=
+
+	# `bash <(curl ...)` sets BASH_SOURCE to /dev/fd/N (a pipe). readlink -f then
+	# yields /proc/PID/fd/pipe:..., and cd fails under set -e before we can clone.
+	# Only look for a local tree when the installer is a normal on-disk file.
+	case "$src" in
+	/dev/fd/* | /proc/*/fd/*) ;;
+	*)
+		if here=$(cd "$(dirname "$(readlink -f "$src")")" && pwd); then
+			if [[ -f $here/miaur && -d $here/lib ]]; then
+				SRC=$here
+				return 0
+			fi
+		fi
+		;;
+	esac
 
 	echo "==> Cloning ${REPO_URL} (${BRANCH})"
 	TMP=$(mktemp -d)