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187 lines
4.5 KiB
187 lines
4.5 KiB
#!/bin/sh
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# Copyright 1999-2015 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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# Executes the correct automake version.
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#
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# If WANT_AUTOMAKE is set (can be a whitespace delimited list of versions):
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# - attempt to find an installed version using those
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# - if magic keyword 'latest' is found, pick the latest version that exists
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# - if nothing found, warn, and proceed as if WANT_AUTOMAKE was not set (below)
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# If WANT_AUTOMAKE is not set:
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# - Try to detect the version of automake used to generate things (look at
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# Makefile.in and aclocal.m4 and any other useful file)
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# - If detected version is not found, warn and proceed as if blank slate
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# - Try to locate the latest version of automake that exists and run it
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(set -o posix) 2>/dev/null && set -o posix
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_stderr() { printf 'am-wrapper: %s: %b\n' "${argv0}" "$*" 1>&2; }
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warn() { _stderr "warning: $*"; }
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err() { _stderr "error: $*"; exit 1; }
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unset IFS
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which() {
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local p
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IFS=: # we don't use IFS anywhere, so don't bother saving/restoring
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for p in ${PATH} ; do
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p="${p}/$1"
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[ -e "${p}" ] && echo "${p}" && return 0
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done
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unset IFS
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return 1
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}
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#
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# Sanitize argv[0] since it isn't always a full path #385201
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#
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argv0=${0##*/}
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case $0 in
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${argv0})
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# find it in PATH
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if ! full_argv0=$(which "${argv0}") ; then
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err "could not locate ${argv0}; file a bug"
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fi
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;;
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*)
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# re-use full/relative paths
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full_argv0=$0
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;;
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esac
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if ! seq 0 0 2>/dev/null 1>&2 ; then #338518
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seq() {
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local f l i
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case $# in
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1) f=1 i=1 l=$1;;
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2) f=$1 i=1 l=$2;;
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3) f=$1 i=$2 l=$3;;
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esac
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while :; do
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[ $l -lt $f -a $i -gt 0 ] && break
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[ $f -lt $l -a $i -lt 0 ] && break
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echo $f
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: $(( f += i ))
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done
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return 0
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}
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fi
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#
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# Set up bindings between actual version and WANT_AUTOMAKE;
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# Start with last known versions to speed up lookup process.
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#
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LAST_KNOWN_AUTOMAKE_VER="15"
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vers=$(printf '1.%s ' `seq ${LAST_KNOWN_AUTOMAKE_VER} -1 4`)
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#
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# Helper to scan for a usable program based on version.
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#
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binary=
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all_vers=
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find_binary() {
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local v
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all_vers="${all_vers} $*" # For error messages.
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for v ; do
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if [ -x "${full_argv0}-${v}" ] ; then
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binary="${full_argv0}-${v}"
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binary_ver=${v}
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return 0
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fi
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done
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return 1
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}
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#
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# Try and find a usable automake version. First check the WANT_AUTOMAKE
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# setting (whitespace delimited list), then fallback to the latest.
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#
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find_latest() {
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if ! find_binary ${vers} ; then
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# Brute force it.
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find_binary $(printf '1.%s ' `seq 99 -1 ${LAST_KNOWN_AUTOMAKE_VER}`)
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fi
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}
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for wx in ${WANT_AUTOMAKE:-latest} ; do
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if [ "${wx}" = "latest" ] ; then
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find_latest && break
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else
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find_binary ${wx} && break
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fi
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done
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if [ -z "${binary}" ] && [ -n "${WANT_AUTOMAKE}" ] ; then
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warn "could not locate installed version for WANT_AUTOMAKE='${WANT_AUTOMAKE}'; ignoring"
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unset WANT_AUTOMAKE
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find_latest
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fi
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if [ -z "${binary}" ] ; then
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err "Unable to locate any usuable version of automake.\n" \
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"\tI tried these versions:${all_vers}\n" \
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"\tWith a base name of '${full_argv0}'."
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fi
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#
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# autodetect helpers
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#
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do_awk() {
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local file=$1 ; shift
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local v=$(awk -v regex="$*" '{
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if (ret = match($0, regex)) {
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s = substr($0, ret, RLENGTH)
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ret = match(s, "[0-9]\\.[0-9]+")
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print substr(s, ret, RLENGTH)
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exit
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}
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}' "${file}")
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case " ${auto_vers} " in
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*" ${v} "*) ;;
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*) auto_vers="${auto_vers:+${auto_vers} }${v}" ;;
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esac
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}
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#
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# autodetect routine
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#
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if [ -z "${WANT_AUTOMAKE}" ] ; then
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auto_vers=
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if [ -r "Makefile.in" ] ; then
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do_awk Makefile.in '^# Makefile.in generated (automatically )?by automake [0-9]\\.[0-9]+'
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fi
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if [ -r "aclocal.m4" ] ; then
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do_awk aclocal.m4 'generated automatically by aclocal [0-9]\\.[0-9]+'
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do_awk aclocal.m4 '[[:space:]]*\\[?AM_AUTOMAKE_VERSION\\(\\[?[0-9]\\.[0-9]+[^)]*\\]?\\)'
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fi
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# We don't need to set $binary here as it has already been setup for us
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# earlier to the latest available version.
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if [ -n "${auto_vers}" ] ; then
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if ! find_binary ${auto_vers} ; then
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warn "auto-detected versions not found (${auto_vers}); falling back to latest available"
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fi
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fi
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fi
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if [ -n "${WANT_AMWRAPPER_DEBUG}" ] ; then
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if [ -n "${WANT_AUTOMAKE}" ] ; then
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warn "DEBUG: WANT_AUTOMAKE is set to ${WANT_AUTOMAKE}"
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fi
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warn "DEBUG: will execute <${binary}>"
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fi
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#
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# for further consistency
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#
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export WANT_AUTOMAKE="${binary_ver}"
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#
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# Now try to run the binary
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#
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if [ ! -x "${binary}" ] ; then
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# this shouldn't happen
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err "${binary} is missing or not executable.\n" \
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"\tPlease try installing the correct version of automake."
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fi
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exec "${binary}" "$@"
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# The shell will error out if `exec` failed.
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