Moving the OTP top level dir, was: Stuff that breaks when you move it

[Scott Lystig Fritchie]

Mazen Harake <mazen.harake@REDACTED> wrote:

mh> Should I be able to move the erlang directory?  [...]

For those who are interested in doing exactly that, it isn't too hard.
We've got a build system which builds various apps from scratch,
including Erlang/OTP, using something like:

    (cd /path/to/otp/src &&
     ./configure --prefix=/funky/path/with/time-of-day/embedded/in/it)

... which means that "make install" will put the build artifacts into a
different directory each time.

This script might work, but I've edited it slightly to remove some
cruft, so it might not.

-Scott

--- snip --- snip --- snip --- snip --- snip --- snip --- snip ---

#!/bin/sh

##
## For copying when configured via:
## ./configure --prefix=/some/place/that/is/not/the/final/installation/dir
##

TAR_DEL_ARG=""
if [ "X$1" = "X-d" ]; then
	shift
	TAR_DEL_ARG="--remove-files"
fi

if [ $# -ne 3 ]; then
	echo usage: $0 [-d] src-dir dst-dir path-dir
	echo example: $0 /usr/local/third-party/erlang /tmp/R13B01 /tmp/R13B01
	echo "NOTE: In most cases, dst-dir and path-dir will be the same."
	echo "      However, in some weird NFS cases, the dst-dir (where"
	echo "      this script will copy files) may be different from"
	echo "      path-dir (where final users will use/execute files)."
	echo NOTE: Both directories should be absolute paths.
	exit 1
fi

SRCDIR=$1
DSTDIR=$2
NEW_ROOTDIR=$3/lib/erlang

if [ ! -d $SRCDIR ]; then
	echo "Source directory $SRCDIR does not exist, aborting!"
	exit 1
fi
if [ ! -d $DSTDIR ]; then
	echo "Destination directory $DSTDIR does not exist, creating"
	mkdir $DSTDIR
	if [ $? -ne 0 ]; then
		echo "mkdir $DSTDIR failed, aborting!"
		exit 1
	fi
fi

echo -n "Copying files from $SRCDIR to $DSTDIR ... "
(cd $SRCDIR ; tar cf - $TAR_DEL_ARG .) | (cd $DSTDIR ; tar xfp -)
echo "done."

echo -n "Performing relocation steps ... "

cd $DSTDIR/bin
for f in dialyzer epmd erl erlc escript run_erl start to_erl typer
do
	if [ -h $f ]; then
		rm -f $f
		# Use wildcard to be Erlang-version-flexible (hopefully)
		ln -s ../lib/erlang/erts-*/bin/$f ./$f
	fi
done

cd ../lib/erlang/erts-*/bin
for f in erl start start_erl
do
	perl -np -e "s|%FINAL_ROOTDIR%|$NEW_ROOTDIR|" < $f.src > $f
	if [ -f $DSTDIR/lib/erlang/bin/$f ] ; then
		cp $f $DSTDIR/lib/erlang/bin/$f
	fi
done
echo "done."

cd $DSTDIR/lib/erlang/bin
rm epmd
ln -s ../erts-*/bin/epmd ./epmd

echo ""
echo "To use the new runtime environment, add the following directory"
echo "to your shell's PATH variable:"
echo ""
echo "	$DSTDIR/bin"
echo ""

exit 0