bootstrap

#!/bin/bash


# The tag can be "master" or a full git check-in hash in lower case hex
# like for example:
#tag=dc184319be9a272ffa4528f5bb5d0902f1edbbbb
tag=0.1
url=https://raw.githubusercontent.com/lanceman2/quickbuild/$tag/quickbuild.make

# If we wanted a particular file, so we checks it's sha512 sum.
# Run:
#
#    sha512sum quickbuild.make
#
# to get this long hex number


sha512sum=4bb12b01391d1c62cc7cebd0705ba2cd5409c8d4e275f4952a120\
2e0b1d442c435b2b9403eeffecbcd85e625325f2337ef60ec176840aa7f0c7a\
e5efc57f1b13


function usage()
{
    cat <<EOF

  Usage: $0

  This bootstrap script downloads and compresses a make file
  from the web via url:

     $url

  We call it bootstrap because you need this make file before
  you can configure and make this package.

EOF
    exit 1
}


[ "$1" = "--help" ] && usage
[ "$1" = "-h" ] && usage

set -ex

# Go to the directory there this script is.
cd $(dirname ${BASH_SOURCE[0]})

if [ -z "$*" ] && [ -e quickbuild.make ] ; then
    set +x
    cat <<EOF

  The file quickbuild.make exists.
  If you wish to regenerate it remove it first.
  Or run

      $0 -f

EOF
    exit 1
fi


set -e
cat <<EOF > quickbuild.make.tmp
# This is a generated file
#
#  You can get the uncompressed and better commented original version
#  of this file from:
#
#      $url
#

EOF


# get the quickbuild.make file from the web
wget --no-check-certificate $url -O quickbuild.make.org 

if [ -n "$sha512sum" ] ; then
    set +x
    # We wanted a particular file, so we checks it's sha512 sum.
    echo "$sha512sum  quickbuild.make.org" | sha512sum -c
    set -x
else
    set +x
    echo "The sha512sum of the downloaded file, before compressing it:"
    set -x
    sha512sum quickbuild.make.org
fi

sed quickbuild.make.org -e 's/^\s*\#.*$//g' -e '/^$/d' >> quickbuild.make.tmp

rm quickbuild.make.org
mv quickbuild.make.tmp quickbuild.make
set +x
echo "SUCCESS"