shared.sh

#!/bin/false
# Copyright 2016 The Rust Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution and at
# http://rust-lang.org/COPYRIGHT.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.

# This file is intended to be sourced with `. shared.sh` or
# `source shared.sh`, hence the invalid shebang and not being
# marked as an executable file in git.

# See http://unix.stackexchange.com/questions/82598
function retry {
  echo "Attempting with retry:" "$@"
  local n=1
  local max=5
  while true; do
    "$@" && break || {
      if [[ $n -lt $max ]]; then
        ((n++))
        echo "Command failed. Attempt $n/$max:"
      else
        echo "The command has failed after $n attempts."
        exit 1
      fi
    }
  done
}