#!/bin/sh
# vim: set ts=4:
set -eu

RUSTC="$1"
TMPDIR="$(pwd)/.tmp-${0##*/}-$RANDOM"
failed=0


_rustc() {
	printf '\n$ rustc %s\n' "$*"
	"$RUSTC" "$@"
}

die() {
	printf '\033[1;31mERROR:\033[0m %s\n' "$1" >&2  # bold red
	exit 1
}

fail() {
	printf '\033[1;31mFAIL:\033[0m %s\n' "$1" >&2  # bold red
	failed=$(( failed + 1 ))
}

assert_dynamic() {
	readelf -l "$1" | grep -Fqw INTERP \
		&& readelf -d "$1" | grep -Fqw NEEDED || {
			fail "$1 is not a dynamic executable!"
			readelf -ld "$1"
		}
}

assert_ok() {
	"$1" || fail "$1 exited with status $?"
}

assert_panic() {
	local status=0
	"$1" || status=$? && [ "$status" = 101 ] \
		|| fail "$1 exited with status $status, but expected 101"
}

assert_pie() {
	readelf -d "$1" | grep -Fw FLAGS_1 | grep -Fqw PIE || {
		fail "$1 is not a PIE executable!"
		readelf -d "$1"
	}
}

assert_static() {
	test -f "$1" \
		&& ! readelf -l "$1" | grep -Fqw INTERP \
		&& ! readelf -d "$1" | grep -Fqw NEEDED || {
			fail "$1 is not a static executable!"
			readelf -ld "$1"
		}
}


#--------------------  M a i n  --------------------

test -d "$TMPDIR" && die "$TMPDIR already exists!"
mkdir -p "$TMPDIR"
trap "rm -R '$TMPDIR'" EXIT

cd "$TMPDIR"

cat >> hello_world.rs <<-EOF
	fn main() {
	    println!("Hello, world!");
	}
EOF

_rustc hello_world.rs
assert_ok ./hello_world
assert_dynamic hello_world
assert_pie hello_world
rm -f hello_world

_rustc -C target-feature=-crt-static hello_world.rs
assert_ok ./hello_world
assert_dynamic hello_world
assert_pie hello_world
rm -f hello_world

_rustc -C target-feature=+crt-static hello_world.rs
assert_ok ./hello_world
assert_static hello_world
assert_pie hello_world
rm -f hello_world


cat >> panic.rs <<-EOF
	fn main() {
	    panic!("This should panic");
	}
EOF

_rustc -C target-feature=-crt-static panic.rs
assert_panic ./panic

_rustc -C target-feature=+crt-static panic.rs
assert_panic ./panic


[ "$failed" -eq 0 ] || die "$failed assertion(s) has failed"