#!/bin/sh -e
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# Helper to bypass AC_ERLANG_CHECK_LIB
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#
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# Ejabberd releases do not download specific versions of its erlang
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# dependencies. Instead, it clones the master branch of a git
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# repository and asks erl to provide the library version. However,
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# the target erl program cannot be called from the host. So, this
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# script aims at finding the library version installed on the target,
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# without calling erlang.
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usage() {
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cat <<EOF
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Usage:
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$0 library
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Look for Erlang's library in TARGET_DIR/usr/lib/erlang/lib.
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If the library is found, it returns the path to the latest version,
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relative to TARGET_DIR. Otherwise, it returns "not found".
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If there are several versions, it returns an error because it does not
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know which one Erlang uses.
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EOF
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}
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die () {
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echo "$@" >&2
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exit 1
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}
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if [ $# -ne 1 ]; then
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usage
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exit 0
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else
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library="$1"
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fi
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target_dir="${TARGET_DIR:-output/target}"
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[ -d "$target_dir" ] || die "TARGET_DIR is not a directory. Please \
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specify the TARGET_DIR environment variable."
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case "$(ls -1d -- "$target_dir/usr/lib/erlang/lib/$library-"* | wc -l)" in
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0)
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echo "not found"
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;;
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1)
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echo "$target_dir/usr/lib/erlang/lib/$library-"* \
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| sed -e "s,^$target_dir,,"
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;;
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*)
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die "Several versions of $library have been found. Please \
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remove the unused ones."
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;;
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esac
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