Test fetch-content.sh when no download utilities are available. Ref: https://github.com/OpenRA/ra2/pull/385

output.txt

$ ./test-fetch-content.sh 
INFO: Preparing $PATH
INFO: Linked /bin/bash
INFO: Linked /bin/ls
INFO: Linked /usr/bin/7z
INFO: Linked /bin/mkdir
INFO: Linked /bin/rm
INFO: Linked /usr/bin/[
INFO: Execute fetch-content.sh with PATH=/tmp/tmp.fWWXp8A7sN
+ set -e
++ uname
+ '[' 'Linux' == Darwin ']'
+ DIR=/home/sam/.openra/Content/ra2
+ '[' '!' -d /home/sam/.openra/Content/ra2 ']'
+ mkdir -p /home/sam/.openra/Content/ra2
+ echo 'Downloading RA2 mod content'
Downloading RA2 mod content
+ cd /home/sam/.openra/Content/ra2
+ download_url http://xwis.net/downloads/Red-Alert-2-Multiplayer.exe
+ URL=http://xwis.net/downloads/Red-Alert-2-Multiplayer.exe
+ LOCAL_FILE=Red-Alert-2-Multiplayer.exe
++ type -p wget
+ '[' -x '' ']'
++ type -p curl
+ '[' -x '' ']'
+ echo 'No supported download method found.'
No supported download method found.
+ return 1
INFO: fetch-content.sh exited with exit code: 1
INFO: Deleting: /tmp/tmp.fWWXp8A7sN

test-fetch-content.sh

#!/bin/bash

function cleanup_on() {
  echo "INFO: Deleting: ${TMPDIR}"
  rm -rf "${TMPDIR}"
}
trap cleanup_on EXIT

echo 'INFO: Preparing $PATH'
TMPDIR="$(mktemp -d)"
#create a $PATH without wget or curl
for x in bash ls 7z mkdir rm '[' uname; do
  if [ -x "$(type -P "$x")" ]; then
    ln -s "$(type -P "$x")" "${TMPDIR%/}/"
    echo "INFO: Linked $(type -P "$x")"
  fi
done

#execute fetch-content.sh with our custom $PATH
echo "INFO: Execute fetch-content.sh with PATH=${TMPDIR}"
PATH="${TMPDIR}" bash -x fetch-content.sh
echo "INFO: fetch-content.sh exited with exit code: $?"