build-hc-pkg

   1 #!/usr/bin/env bash
   2 set -e
   3
   4 function detect_platform_type () {
   5     local -r canon_name="canon-name/src/canon-name"
   6
   7     if ! gmake --question --file="mk/canon-name.mk" >/dev/null 2>&1; then
   8         gmake --file="mk/canon-name.mk" >&2
   9     fi
  10
  11     "$canon_name"
  12 }
  13
  14 function detect_number_of_cpus () {
  15     if sysctl -n "hw.ncpu" 2>/dev/null; then
  16         # This works for most BSDs.
  17         :
  18     elif grep -qF processor /proc/cpuinfo; then
  19         # Linux sucks...
  20         grep -cF processor /proc/cpuinfo
  21     else
  22         echo "WARNING: I don't know how to detect the number of processors on this platform." >&2
  23         echo "WARNING: GHC will be built using only 1 processor. Expect some slowdown." >&2
  24         echo 1
  25     fi
  26 }
  27
  28 function detect_gnu_tar () {
  29     if which gnutar >/dev/null 2>&1; then
  30         echo "gnutar"
  31     elif which gtar >/dev/null 2>&1; then
  32         echo "gtar"
  33     else
  34         echo "We need GNU tar to be installed." >&2
  35         exit 1
  36     fi
  37 }
  38
  39 function say_hello () {
  40     local -r self=$(basename "$0")
  41     local -r platform=$(detect_platform_type)
  42     local -r n_cpus=$(detect_number_of_cpus)
  43
  44     echo -n "This is $self, running on $platform with $n_cpus "
  45     if (( $n_cpus == 1 )); then
  46         echo "processor."
  47     else
  48         echo "processors."
  49     fi
  50 }
  51
  52 function srcpath () {
  53     local -r archive="work/archive"
  54     local srcpath=""
  55
  56     if [[ -e "$archive" ]]; then
  57         srcpath=$(cat "$archive")
  58     fi
  59
  60     if [[ -z "$srcpath" || ! -e "$srcpath" ]]; then
  61         mkdir -p work
  62         read -e -p "Enter the file path to ghc-x.y.z-src.tar.bz2: " srcpath
  63         if [[ -e "$srcpath" ]]; then
  64             mkdir -p work
  65             echo "$srcpath" > "$archive"
  66         else
  67             echo "$srcpath not found." >&2
  68             exit 1
  69         fi
  70     fi
  71
  72     echo "$srcpath"
  73 }
  74
  75 function build_hc_pkg () {
  76     local -r srcpath="$(srcpath)"
  77
  78     gmake \
  79         -j $(($(detect_number_of_cpus) + 1)) \
  80         -f mk/main.mk \
  81         SRCPATH="$srcpath" \
  82         PLATFORM="$(detect_platform_type)" \
  83         GNUTAR="$(detect_gnu_tar)" \
  84         SHELL="$SHELL"
  85
  86     echo "If you are done, run \"$0 clean\" to cleanup the working directory."
  87 }
  88
  89 function main () {
  90     case "$1" in
  91         "")
  92             say_hello
  93             build_hc_pkg
  94             exit
  95             ;;
  96         "clean")
  97             echo "Cleaning..."
  98             rm -rf work
  99             exit
 100             ;;
 101         *)
 102             echo "Usage: $0 [clean]" >&2
 103             exit 1
 104             ;;
 105     esac
 106 }
 107
 108 main $@