git-annex/standalone/osx/git-annex.app/Contents/MacOS/runshell

#!/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# Put our binaries first, to avoid issues with out of date or incompatable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

# This makes the linker first look in the library directories bundled
# in this app. Only if it fails to find a library there will a system
# library be used.
# 
# This seems to work better than DYLD_LIBRARY_PATH, which can force
# the wrong version of a library to be used, if the app bundles two
# different versions of a single library. And it seems to work better
# than DYLD_FALLBACK_LIBRARY_PATH, which fails to override old system
# versions of libraries when a program in the app needs a newer version.
DYLD_ROOT_PATH=$base
export DYLD_ROOT_PATH

GIT_EXEC_PATH=$base/git-core
export GIT_EXEC_PATH

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