gen_compile.sh: populate_binpkg(): Throw away binpkg when glibc has changed

It was reported that dropbear in genkernel initramfs crashed when
client tried to connect.

The problem is, that while we are compiling statically, we still depend
on used glibc version. I.e. dropbear binpkg was created against glibc
version A, but when genkernel initramfs will be created, we will copy
system libraries from whatever glibc version host is currently using which
doesn't necessarily need to match used glibc version when binpkg was
created which could result in reported problem.

This commit will make genkernel treat binpkg as stale when glibc was
changed since binpkg was created to force a rebuild.

Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/gen_compile.sh b/gen_compile.sh
index d755150..e2b86cc 100755
--- a/gen_compile.sh
+++ b/gen_compile.sh
@@ -510,6 +510,23 @@ populate_binpkg() {
 		unset patch patchdir
 	fi
 
+	if [[ -f "${BINPKG}" ]]
+	then
+		if isTrue "$(is_glibc)"
+		then
+			local libdir=$(get_chost_libdir)
+			local glibc_test_file="${libdir}/libnss_files.so"
+
+			if [[ "${BINPKG}" -ot "${glibc_test_file}" ]]
+			then
+				print_info 3 "${CHECK_LEVEL_PREFIX}Glibc (${glibc_test_file}) is newer than us; Removing stale ${P} binpkg ..."
+				rm "${BINPKG}" || gen_die "Failed to remove stale binpkg '${BINPKG}'!"
+			fi
+
+			print_info 3 "${CHECK_LEVEL_PREFIX}Existing ${P} binpkg is newer than glibc (${glibc_test_file}); Skipping ..."
+		fi
+	fi
+
 	if [[ ! -f "${BINPKG}" ]]
 	then
 		print_info 3 "${CHECK_LEVEL_PREFIX}Binpkg '${BINPKG}' does NOT exist; Need to build ${P} ..."