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#!/bin/sh
# rustc out of the dist tarball buck fetched, with the sysroot stitched on.
#
# The same job scripts/rustc does, said in a way buck can ship: the wrapper and
# the tarball are both inputs to every action that runs it, so the compiler's
# identity is part of the action's cache digest and a remote worker can be
# handed the whole thing.
#
# $1 is the directory the tarball unpacked into, $2 the target triple; buck
# passes both because neither is knowable from inside the script.
set -e
dist=$1
triple=$2
shift 2

# The dist tarball keeps its components in sibling directories, so the
# compiler's own default sysroot (rustc/) holds no libstd — it lives under
# rust-std-<triple>/. The codegen libraries are found by rpath relative to the
# binary, so only the sysroot has to be named.
#
# Callers that set their own win: buck's rustc_cfg action passes an empty
# --sysroot, and rustc refuses the option twice.
for arg do
    case $arg in
        --sysroot|--sysroot=*) exec "$dist/rustc/bin/rustc" "$@" ;;
    esac
done

exec "$dist/rustc/bin/rustc" --sysroot "$dist/rust-std-$triple" "$@"