fs-dequarantine, setup-util-brew: fix peculiarities

- fs-dequarantine: no longer uses complex fallback method, and checks for approprite method first
- setup-util-brew: add debugging for unexpected environment configuration

```
xattr: /Users/runner/.local/bin/bash: No such xattr: com.apple.quarantine
The [bash] required utility was not upgraded via [download]
/Users/runner/.local/share/dorothy/commands/setup-util-brew: line 55: HOMEBREW_ARCH: unbound variable
```

> https://github.com/bevry/dorothy/actions/runs/7499530414/job/20416492860#step:3:32

commands/fs-dequarantine

@@ -50,20 +50,22 @@ function fs_dequaratine() (
 	fi
 
 	function disable_quarantine_on_path {
-		local path="$1" output status cmd=('xattr')
 		# https://apple.stackexchange.com/a/436677/15131
 		# note that the -r option doesn't exist, will return [option -r not recognized] on Ventura and Sonoma
-		cmd+=('-d' 'com.apple.quarantine' "$path")
-		eval_capture --outputvar=output --statusvar=status -- "${cmd[@]}"
-		if test "$status" -eq 0 -o "$output" = 'No such xattr: com.apple.quarantine'; then
-			return 0
+		# cannot just -d directly, as will get a [No such xattr: com.apple.quarantine] error, so check for it first, this induces no errors
+		local path="$1"
+		if test -r "$path"; then
+			if xattr -l "$path" | grep --quiet --fixed-strings --regexp='com.apple.quarantine'; then
+				xattr -d com.apple.quarantine "$path" >/dev/stderr
+				return
+			fi
+		elif sudo-helper -- test -r "$path"; then
+			if sudo-helper -- xattr -l "$path" | grep --quiet --fixed-strings --regexp='com.apple.quarantine'; then
+				sudo-helper -- xattr -d com.apple.quarantine "$path" >/dev/stderr
+				return
+			fi
 		fi
-		eval_capture --outputvar=output --statusvar=status -- sudo-helper -- "${cmd[@]}"
-		if test "$status" -eq 0 -o "$output" = 'No such xattr: com.apple.quarantine'; then
-			return 0
-		fi
-		print_line "$output" >/dev/stderr
-		return "$status"
+		return 0
 	}
 
 	local path

commands/setup-util-brew

@@ -8,17 +8,21 @@ function setup_util_brew() (
 		return 0
 	fi
 
+	# environment provides:
+	# HOMEBREW_ARCH, HOMEBREW_PREFIX
+	if test -z "${HOMEBREW_ARCH-}" -o -z "${HOMEBREW_PREFIX-}"; then
+		echo-error 'HOMEBREW_ARCH and HOMEBREW_PREFIX are missing, cannot setup brew, for some reason this was executed before the Dorothy environment was configured'
+		uname -a
+		uname -s
+		env >&2
+		return 6 # ENXIO 6 Device not configured
+	fi
+
 	# enable EVAL_INSTALL, etc
 	source "$(type -P setup-util)"
 
 	# uninstall brew, and adapt the system accordingly
 	function brew_uninstall {
-		# environment provides:
-		# HOMEBREW_ARCH, HOMEBREW_PREFIX
-		if test -z "${HOMEBREW_PREFIX-}"; then
-			echo-error 'HOMEBREW_PREFIX is not defined, cannot uninstall brew.'
-			return 6 # ENXIO 6 Device not configured
-		fi
 		local remove removals=(
 			"${HOMEBREW_PREFIX}/"*
 			/usr/local/*
@@ -37,7 +41,7 @@ function setup_util_brew() (
 
 		# uninstall brew
 		if is-brew; then
-			arch -"${HOMEBREW_ARCH}" /bin/bash -c "$(fetch https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)" -- --force
+			arch "-${HOMEBREW_ARCH}" /bin/bash -c "$(fetch https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)" -- --force
 		fi
 
 		# remove any leftover directories
@@ -53,7 +57,7 @@ function setup_util_brew() (
 	# https://github.com/balupton/dotfiles/commit/69dbbe81bf30f9e0d9a1dd1d00eca3f3c88b943b
 	function brew_install {
 		env HOMEBREW_NO_AUTO_UPDATE=1 \
-			arch -"${HOMEBREW_ARCH}" /bin/bash -c "$(fetch https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+			arch "-${HOMEBREW_ARCH}" /bin/bash -c "$(fetch https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
 		source "$DOROTHY/sources/environment.sh" # child processes will also inherit these changes
 	}