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|
#!/bin/bash
######################################################################
# Generate helper code for making builtin DSO plugins available.
#
# Sometimes it is necessary to split a plugin to several source
# files. Usually this is the case when the functionality provided
# by the plugin is complex enough to require subdividing the plugin
# into internal modules for the best maintainability.
#
# In these cases we cannot avoid making several functions and
# variables globally available within the plugin so we cannot just
# limit the scope of visibility by making them static. Still, we do
# want to avoid conflicts between these symbols of different plugins.
# To accomplish this we compile and link such plugins into shared
# libraries (with our normal symbol visibility conventions) and then
# link the murphy daemon against them.
#
# Since none of the code linked into murphy proper references
# any of the symbols in any of these plugins without any further
# special arrangements these plugins wouldn't be demand-loaded
# and consequently would be unavailable when the daemon starts up.
#
# To overcome this every such plugin gets automatically augmented
# by a plugin-specifig globally visible symbol and the murphy daemon
# gets augmented by a symbol that references these plugin-specific
# symbols. This forces the dynamic loader to load the plugins and
# the normal builtin-plugin autoregistration mechanism takes care of
# the rest.
#
# A bit too spaceship-ish, I admit... but nevertheless necessary
# unless we want to give up the idea of builtin/linkedin plugins...
#
error () {
echo "error: $*" 1>&2
}
info () {
echo "$*" 1>&2
}
warning () {
echo "warning: $*" 1>&2
}
usage () {
info "usage: $0 -p <plugin> -o <output-file>, or"
info "usage: $0 -o <output-file> -d <plugin-list>"
exit ${1:-1}
}
emit () {
echo "$*" >> $OUTPUT
}
emit_plugin_loader () {
case $OUTPUT in
*.c) emit "int mrp_linkedin_plugin_${1//-/_}_symbol = 0;"
;;
*.h) emit "extern int mrp_linkedin_plugin_${1//-/_}_symbol;"
;;
esac
}
emit_murphy_loader () {
local _p
for _p in $*; do
emit "#include \"linkedin-$_p-loader.h\""
done
emit ""
emit "int mrp_load_linkedin_plugins(void)"
emit "{"
emit " return \\"
for _p in $*; do
emit " mrp_linkedin_plugin_${_p//-/_}_symbol + \\"
done
emit " 0;"
emit "}"
}
OUTPUT=""
PLUGIN=""
PLUGIN_LIST=""
daemon=no
#echo "*** $0 $* ***"
# parse command line
while [ -n "${1#-}" ]; do
case $1 in
-o)
if [ -z "$OUTPUT" ]; then
shift
OUTPUT="$1"
else
error "Multiple output files requested."
usage
fi
;;
-p)
if [ -z "$PLUGIN" -a "$daemon" = "no" ]; then
shift
PLUGIN="$1"
else
if [ -n "$PLUGIN" ]; then
error "Multiple builtin plugins specified."
else
error "Both builtin plugin and plugin list specified."
fi
usage
fi
;;
-h)
usage 0
;;
-q)
QUIET="yes"
;;
-d)
daemon=yes
;;
-*)
error "Unknown option '$1'."
usage
;;
*)
if [ "$daemon" = "yes" ]; then
PLUGIN_LIST="$PLUGIN_LIST $1"
else
error "Unexpected argument '$1'."
usage
fi
;;
esac
shift
done
# check that we've got everything mandatory
if [ -z "$OUTPUT" ]; then
error "No output file specified (use the -o option)."
usage
fi
if [ -z "$PLUGIN" -a "$daemon" = "no" ]; then
error "Neither builtin plugin nor plugin list is specified."
usage
fi
# generate the output
rm -f $OUTPUT
touch $OUTPUT
if [ "$daemon" = "no" ]; then
emit_plugin_loader $PLUGIN
else
emit_murphy_loader $PLUGIN_LIST
fi
|
