Update setup script.

setup.sh

@@ -3,26 +3,28 @@ set -Eeuo pipefail
 
 # $1: Error message
 # $2: Error code
+# $3: Error line
 function fatal() {
   local msg=${1:-"Unspecified error"}
-  echo "[Error:$LINENO] Could not install dotfiles: $msg"
+  local line=${3:-9}
+  echo "[Error:$line] Could not install dotfiles: $msg"
   exit ${2:-1}
 }
-trap 'fatal "Trapped an unknown error" $?' ERR
+trap 'fatal "Trapped an unknown error" $? $LINENO' ERR
 
 if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
-  fatal "Run setup.sh from the root directory of the dotfiles repository." 2
+  fatal "Run setup.sh from the root directory of the dotfiles repository." 2 $LINENO
 fi
 git submodule update --init --recursive
 
 # Use alias for installing packages so we don't maintain several dependency lists.
 if ! [[ -f .bash.d/.bash_exports ]]; then
-  fatal "Failed to locate .bash.d/.bash_exports in path: $(pwd)" 3
+  fatal "Failed to locate .bash.d/.bash_exports in path: $(pwd)" 3 $LINENO
 fi
 . .bash.d/.bash_exports
 
 if [[ -z ${DOT_PACKAGES:-} ]]; then
-	fatal "DOT_PACKAGES variable not found after sourcing $(pwd)/.bash_aliases" 4
+	fatal "DOT_PACKAGES variable not found after sourcing $(pwd)/.bash.d/.bash_aliases" 4 $LINENO
 fi
 sudo apt update -y && sudo apt install -y $DOT_PACKAGES
 go install github.com/arl/gitmux@latest