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|
#!/bin/sh
# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
NAME="automake"
# Executes the correct automake version.
#
# If WANT_AUTOMAKE is set (can be a whitespace delimited list of versions):
# - attempt to find an installed version using those
# - if magic keyword 'latest' is found, pick the latest version that exists
# - if nothing found, warn, and proceed as if WANT_AUTOMAKE was not set (below)
# If WANT_AUTOMAKE is not set:
# - Try to detect the version of automake used to generate things (look at
# Makefile.in and aclocal.m4 and any other useful file)
# - If detected version is not found, warn and proceed as if blank slate
# - Try to locate the latest version of automake that exists and run it
(set -o posix) 2>/dev/null && set -o posix
_stderr() { printf 'am-wrapper: %s: %b\n' "${argv0}" "$*" 1>&2; }
warn() { _stderr "warning: $*"; }
err() { _stderr "error: $*"; exit 1; }
unset IFS
which() {
local p
IFS=: # we don't use IFS anywhere, so don't bother saving/restoring
for p in ${PATH} ; do
p="${p}/$1"
[ -e "${p}" ] && echo "${p}" && return 0
done
unset IFS
return 1
}
#
# Sanitize argv[0] since it isn't always a full path #385201
#
argv0=${0##*/}
case $0 in
${argv0})
# find it in PATH
if ! full_argv0=$(which "${argv0}") ; then
err "could not locate ${argv0}; file a bug"
fi
;;
*)
# re-use full/relative paths
full_argv0=$0
;;
esac
if ! seq 0 0 2>/dev/null 1>&2 ; then #338518
seq() {
local f l i
case $# in
1) f=1 i=1 l=$1;;
2) f=$1 i=1 l=$2;;
3) f=$1 i=$2 l=$3;;
esac
while :; do
[ $l -lt $f -a $i -gt 0 ] && break
[ $f -lt $l -a $i -lt 0 ] && break
echo $f
: $(( f += i ))
done
return 0
}
fi
#
# Set up bindings between actual version and WANT_AUTOMAKE;
# Start with last known versions to speed up lookup process.
#
LAST_KNOWN_AUTOMAKE_VER="16"
vers=$(printf '1.%s ' `seq ${LAST_KNOWN_AUTOMAKE_VER} -1 4`)
#
# Helper to scan for a usable program based on version.
#
binary=
all_vers=
find_binary() {
local v
all_vers="${all_vers} $*" # For error messages.
for v ; do
if [ -x "${full_argv0}-${v}" ] ; then
binary="${full_argv0}-${v}"
binary_ver=${v}
return 0
fi
done
return 1
}
#
# Try and find a usable automake version. First check the WANT_AUTOMAKE
# setting (whitespace delimited list), then fallback to the latest.
#
find_latest() {
if ! find_binary ${vers} ; then
# Brute force it.
find_binary $(printf '1.%s ' `seq 99 -1 ${LAST_KNOWN_AUTOMAKE_VER}`)
fi
}
for wx in ${WANT_AUTOMAKE:-latest} ; do
if [ "${wx}" = "latest" ] ; then
find_latest && break
else
find_binary ${wx} && break
fi
done
if [ -z "${binary}" ] && [ -n "${WANT_AUTOMAKE}" ] ; then
warn "could not locate installed version for WANT_AUTOMAKE='${WANT_AUTOMAKE}'; ignoring"
unset WANT_AUTOMAKE
find_latest
fi
if [ -z "${binary}" ] ; then
err "Unable to locate any usuable version of ${NAME}.\n" \
"\tI tried these versions:${all_vers}\n" \
"\tWith a base name of '${full_argv0}'."
fi
#
# autodetect helpers
#
do_awk() {
local file=$1 ; shift
local v=$(awk -v regex="$*" '{
if (ret = match($0, regex)) {
s = substr($0, ret, RLENGTH)
ret = match(s, "[0-9]\\.[0-9]+")
print substr(s, ret, RLENGTH)
exit
}
}' "${file}")
case " ${auto_vers} " in
*" ${v} "*) ;;
*) auto_vers="${auto_vers:+${auto_vers} }${v}" ;;
esac
}
#
# autodetect routine
#
if [ -z "${WANT_AUTOMAKE}" ] ; then
auto_vers=
if [ -r "Makefile.in" ] ; then
do_awk Makefile.in '^# Makefile.in generated (automatically )?by automake [0-9]\\.[0-9]+'
fi
if [ -r "aclocal.m4" ] ; then
do_awk aclocal.m4 'generated automatically by aclocal [0-9]\\.[0-9]+'
do_awk aclocal.m4 '[[:space:]]*\\[?AM_AUTOMAKE_VERSION\\(\\[?[0-9]\\.[0-9]+[^)]*\\]?\\)'
fi
# We don't need to set $binary here as it has already been setup for us
# earlier to the latest available version.
if [ -n "${auto_vers}" ] ; then
if ! find_binary ${auto_vers} ; then
warn "auto-detected versions not found (${auto_vers}); falling back to latest available"
fi
fi
fi
if [ -n "${WANT_AMWRAPPER_DEBUG}" ] ; then
if [ -n "${WANT_AUTOMAKE}" ] ; then
warn "DEBUG: WANT_AUTOMAKE is set to ${WANT_AUTOMAKE}"
fi
warn "DEBUG: will execute <${binary}>"
fi
#
# for further consistency
#
export WANT_AUTOMAKE="${binary_ver}"
#
# Now try to run the binary
#
if [ ! -x "${binary}" ] ; then
# this shouldn't happen
err "${binary} is missing or not executable.\n" \
"\tPlease try installing the correct version of ${NAME}."
fi
exec "${binary}" "$@"
# The shell will error out if `exec` failed.
|
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