From 1a8cc5a63d495da8d9fbddec28aded237942e5ef Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 3 Sep 2016 14:26:40 +0200
Subject: Only use default sudo for default installation directory in build.sh

---
 build.sh | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/build.sh b/build.sh
index 7b267c9..080f9cd 100755
--- a/build.sh
+++ b/build.sh
@@ -38,8 +38,9 @@ run ()
 owd="$(pwd)"
 
 cxx=
-idir="/usr/local"
-sudo="sudo"
+idir=
+sudo=
+sudo_set=
 
 while test $# -ne 0; do
   case $1 in
@@ -47,11 +48,11 @@ while test $# -ne 0; do
       diag
       diag "$usage"
       diag
-      diag "By default the script will install into /usr/local using sudo. To"
-      diag "instruct the script not to use a sudo program, pass empty value to"
-      diag "the --sudo option, for example:"
+      diag "By default the script will install into /usr/local using sudo (1)."
+      diag "To use sudo for a custom installation directory you need to specify"
+      diag "the sudo program explicitly, for example:"
       diag
-      diag "$0 --install-dir /tmp/build2 --sudo '' g++"
+      diag "$0 --install-dir /opt/build2 --sudo sudo g++"
       diag
       diag "See the INSTALL file for details."
       diag
@@ -75,6 +76,7 @@ while test $# -ne 0; do
 	exit 1
       fi
       sudo="$1"
+      sudo_set="y"
       shift
       ;;
     *)
@@ -90,6 +92,17 @@ if test -z "$cxx"; then
   exit 1
 fi
 
+# Only use default sudo for the default installation directory and only if
+# it wasn't specified by the user.
+#
+if test -z "$idir"; then
+  idir="/usr/local"
+
+  if test -z "$sudo_set"; then
+    sudo="sudo"
+  fi
+fi
+
 if test -f build/config.build; then
   diag "current directory already configured, start with clean source"
   exit 1
-- 
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