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#!/bin/bash
#
# build the build_date.c and build_date.h files
#
# (bash required for getopts)
#
THIS_CMD=${0##*/}
usage()
{
echo "Usage: $THIS_CMD [OPTIONS]"
echo "Where OPTIONS are from:"
echo " -c OUT_SOURCE create C source file OUT_SOURCE with the date"
echo " -i OUT_HEADER create C include file OUT_HEADER for the date file"
echo " -S EPOCH_DATE_NUMBER use '--date=@EPOCH_DATE_NUMBER' to set date (repeatable builds)"
echo "Also sets EPOCH date number from SOURCE_DATE_EPOCH if set in the environment"
}
generate_source_file()
{
outfile="$1"
if [ -n "$SOURCE_DATE_EPOCH" ] ; then
echo 'char *build_date = "'`LC_ALL=C.UTF-8 date --date=@$SOURCE_DATE_EPOCH -u`'";' >"$outfile"
else
echo 'char *build_date = "'`date`'";' >"$outfile"
fi
}
generate_include_file()
{
outfile="$1"
echo 'extern char *build_date;' >"$outfile"
}
do_source=
do_include=
while getopts :c:i:S:h opt; do
case "$opt" in
c) do_source="$OPTARG" ;;
i) do_include="$OPTARG" ;;
S) SOURCE_DATE_EPOCH="$OPTARG" ;;
h) usage; exit 0 ;;
?) echo "unknown option" 1>&2; usage; exit 1 ;;
esac
done
if [ -n "$do_source" ]; then
generate_source_file $do_source
fi
if [ -n "$do_include" ]; then
generate_include_file $do_include
fi
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