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