rust/entrypoint.sh

#!/usr/bin/env bash

set -e
set | grep INPUT_ARGS
echo "INPUT_ARGS: ${INPUT_ARGS}"

# split input into an array
read -ra ARGS <<<"${INPUT_ARGS}"

# default toolchain
TOOLCHAIN="stable"
echo "Default toolchain: ${TOOLCHAIN}"

# if first parameter is 'nightly'...
if test "${ARGS[0]}" == "nightly"; then
  TOOLCHAIN="nightly"
  ARGS=("${ARGS[@]:1}")
fi
if test "${ARGS[0]}" == "stable"; then
  TOOLCHAIN="stable" # redundant as this is the default
  ARGS=("${ARGS[@]:1}")
fi
if [[ "${ARGS[0]}" == v1* ]]; then
  TOOLCHAIN="${ARGS[0]:1}"
  ARGS=("${ARGS[@]:1}")
fi
echo "Selected toolchain: ${TOOLCHAIN}"

rustup update "${TOOLCHAIN}"

if test "${ARGS[0]}" == "cargo";then
  PRE_COMMAND="cargo +${TOOLCHAIN} "
else
  PRE_COMMAND="${ARGS[0]}"
fi
ARGS=("${ARGS[@]:1}")

# ensure toolchain is up-to-date
# recombine remaining arguments
COMMAND=$(
  IFS=" "
  echo "${ARGS[*]}"
)

# execute command
echo "${PRE_COMMAND} ${COMMAND}"
${PRE_COMMAND} ${COMMAND}