package/ejabberd/check-erlang-lib

   1 #!/bin/sh -e
   2 # Helper to bypass AC_ERLANG_CHECK_LIB
   3 #
   4 # Ejabberd releases do not download specific versions of its erlang
   5 # dependencies.  Instead, it clones the master branch of a git
   6 # repository and asks erl to provide the library version.  However,
   7 # the target erl program cannot be called from the host. So, this
   8 # script aims at finding the library version installed on the target,
   9 # without calling erlang.
  10
  11 usage() {
  12     cat <<EOF
  13 Usage:
  14         $0 library
  15 Look for Erlang's library in TARGET_DIR/usr/lib/erlang/lib.
  16
  17 If the library is found, it returns the path to the latest version,
  18 relative to TARGET_DIR. Otherwise, it returns "not found".
  19
  20 If there are several versions, it returns an error because it does not
  21 know which one Erlang uses.
  22
  23 EOF
  24 }
  25
  26 die () {
  27     echo "$@" >&2
  28     exit 1
  29 }
  30
  31 if [ $# -ne 1 ]; then
  32     usage
  33     exit 0
  34 else
  35     library="$1"
  36 fi
  37
  38 target_dir="${TARGET_DIR:-output/target}"
  39
  40 [ -d "$target_dir" ] || die "TARGET_DIR is not a directory. Please \
  41 specify the TARGET_DIR environment variable."
  42
  43 case "$(ls -1d -- "$target_dir/usr/lib/erlang/lib/$library-"* | wc -l)" in
  44     0)
  45         echo "not found"
  46         ;;
  47     1)
  48         echo "$target_dir/usr/lib/erlang/lib/$library-"* \
  49             | sed -e "s,^$target_dir,,"
  50         ;;
  51     *)
  52         die "Several versions of $library have been found. Please \
  53         remove the unused ones."
  54         ;;
  55 esac