[jhbuild] autogen.sh: drop bashism, use POSIX sh

[Ryan Lortie <desrt src gnome org>]

commit 8a216fa535475cd17785dc43537348a0d19ff46f
Author: Ryan Lortie <desrt desrt ca>
Date:   Sat Dec 21 21:06:33 2013 -0500

    autogen.sh: drop bashism, use POSIX sh
    
    We had a complicated loop in autogen.sh for parsing commandline options.
    It allowed setting arbitrary variables in the script, despite the fact
    that only two variable were ever documented as being supported (or
    probably ever used).  The ability to set random shell variables was
    pretty questionable to begin with.
    
    Remove the bash-specific substring operations and replace the loop with
    a more common switch-based approach which should work with any POSIX
    shell (tested with dash).  Change to #!/bin/sh.
    
    This patch has the side effect that the user can no longer use a
    commandline argument to modify the IFS of the shell running autogen.sh,
    but that seems like a good thing to me.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=720068

 autogen.sh |   22 +++++++++-------------
 1 files changed, 9 insertions(+), 13 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index ed22427..53ee157 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/bin/sh
 #
 # JHBuild configuration script.
 #
@@ -82,19 +82,15 @@ parse_commandline()
   enable_autotools=$TRUE
 
   while [ -n "$1" ]; do
-    # substring operations available in all sh?
-    if [ ${1:0:2} = "--" ]; then
-      keyvalue=${1:2}
-      key=${keyvalue%%=*}
-      value=${keyvalue##*=}
-      if [ "$key" = "simple-install" ]; then
+    case "$1" in
+      --simple-install)
         enable_autotools=$FALSE
-      fi
-      echo $key | grep -E '^[A-Za-z_][A-Za-z_0-9]*$' > /dev/null 2>&1
-      if [ $? -eq 0 ]; then
-        eval $key=$value
-      fi
-    fi
+        ;;
+
+      --prefix=*)
+        prefix="$(echo "$1" | cut -d= -f2)"
+        ;;
+    esac
     shift
   done
 }