#! /bin/sh
set -e

# This script adds "udeb lines" to shlibs files which allows other udebs
# to get correct dependencies when built against glibc libraries.
# The script was written by Frans Pop <fjp@debian.org>.

package="$1"
shlibs_file="debian/$package/DEBIAN/shlibs"

# Skip packages that don't have an shlibs file.
# The "cross-subarch" library packages have an shlibs file, but should
# not have udeb lines, so skip those as well.
if [ ! -r "$shlibs_file" ] || \
   echo "$package" | grep -Eq "^libc[0-9.]+-"; then
	exit 0
fi

# $1: regexp to select libraries for which lines should be duplicated
# $2: name of the udeb the new line should point to
add_udeb_line() {
	local regexp udeb line lib soname package rest
	regexp="$1"
	udeb="$2"

	if line="$(grep "^$regexp[[:space:]]" $shlibs_file)"; then
		echo "$line" | while read lib soname package rest; do
			echo "udeb: $lib $soname $udeb $rest" >>$shlibs_file
		done
	fi
}


W="[^[:space:]]*"

# The following lists should match the ones in the *-udeb.install files
# in debian/debhelper.in; $W replaces any "*" wildcards there.
expr_libc1="ld$W libm-$W libm libdl$W libresolv$W libc-$W libc"
expr_libc2="libutil$W libcrypt$W librt$W libpthread$W"
expr_nss_dns="libnss_dns$W"
expr_nss_files="libnss_files$W"

for expr in $expr_libc1 $expr_libc2; do
	add_udeb_line "$expr" $package-udeb
done
for expr in $expr_nss_dns; do
	add_udeb_line "$expr" libnss-dns-udeb
done
for expr in $expr_nss_files; do
	add_udeb_line "$expr" libnss-files-udeb
done