#!/bin/sh
# Runs a shell command (or interactive shell) using the binaries and
# libraries bundled with this app.

set -e

base="$(dirname $0)"

if [ ! -d "$base" ]; then
	echo "** cannot find base directory (I seem to be $0)" >&2
	exit 1
fi

if [ ! -e "$base/bin/git-annex" ]; then
	echo "** base directory $base does not contain bin/git-annex" >&2
	exit 1
fi
if [ ! -e "$base/bin/git" ]; then
	echo "** base directory $base does not contain bin/git" >&2
	exit 1
fi

# Get absolute path to base, to avoid breakage when things change directories.
orig="$(pwd)"
cd "$base"
base="$(pwd)"
cd "$orig"

# Put our binaries first, to avoid issues with out of date or incompatable
# system binaries.
PATH=$base/bin:$PATH
export PATH

# Using DYLD_FALLBACK_LIBRARY_PATH rather than DYLD_LIBRARY_PATH, so as
# not to force binaries to link against possibly the wrong versions of
# libraries found in the path. With DYLD_FALLBACK_LIBRARY_PATH, the
# system's versions of libraries will be used when possible, and otherwise
# it will fall back to using the libraries bundled with this app.
for lib in $(cat $base/libdirs); do
	DYLD_FALLBACK_LIBRARY_PATH="$base/$lib:$DYLD_FALLBACK_LIBRARY_PATH"
done
export DYLD_FALLBACK_LIBRARY_PATH

GIT_EXEC_PATH=$base/git-core
export GIT_EXEC_PATH

if [ "$1" ]; then
	cmd="$1"
	shift 1
	exec "$cmd" "$@"
else
	$SHELL
fi