get-stack: check deps before sudo

Don't need to invoke sudo if all deps are already installed. Avoiding the sudo prompt where possible is going to be an improvement.
commercialhaskell · Jun 10, 2018 · 4a8d4de · 4a8d4de
1 parent df6520a
commit 4a8d4de
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/etc/scripts/get-stack.sh b/etc/scripts/get-stack.sh
@@ -561,7 +561,9 @@ try_install_pkgs() {
 
 # Install packages using apt-get
 apt_get_install_pkgs() {
-  if ! sudocmd apt-get install -y ${QUIET:+-qq} "$@"; then
+  if dpkg-query -W "$@" > /dev/null; then
+    info "Already installed!"
+  elif ! sudocmd apt-get install -y ${QUIET:+-qq} "$@"; then
     die "Installing apt packages failed.  Please run 'apt-get update' and try again."
   fi
 }