Add HOMEBREW_PREFIX and _CELLAR env vars to brew caller

modules/04-install-brew.sh

@@ -106,8 +106,8 @@ function createBrewCallerScript() {
 	local homebrewRepositoryPath="$(getHomebrewRepositoryPath)"
 	local brewCallerPath="${homebrewRepositoryPath}/bin/brew-caller"
 	local brewCallerSymlink="/usr/local/bin/brew"
-	[ -f "${brewCallerPath}" ] && rm "${brewCallerPath}"
-	[ -f "${brewCallerSymlink}" ] && rm "${brewCallerSymlink}"
+	[[ -f "${brewCallerPath}" ]] && rm "${brewCallerPath}"
+	[[ -f "${brewCallerSymlink}" || -h "${brewCallerSymlink}" ]] && rm "${brewCallerSymlink}"
 	cat <<- BREWCALLER | clang -x c -O2 -Wall -o "${brewCallerPath}" -
 	#include <unistd.h>
 	#include <sys/types.h>
@@ -158,6 +158,8 @@ function createBrewCallerScript() {
 					"HOMEBREW_LOGS=${homebrew_log}",
 					format_env("HOME", "%s"),
 					format_env("HOMEBREW_CASK_OPTS", "--no-quarantine %s"),
+					"HOMEBREW_PREFIX=${homebrewRepositoryPath}",
+					"HOMEBREW_CELLAR=${homebrewRepositoryPath}/Cellar",
 					"HOMEBREW_NO_AUTO_UPDATE=1",
 					"HOMEBREW_NO_ANALYTICS=1",
 					"HOMEBREW_NO_ANALYTICS_THIS_RUN=1",