arch-nspawn: use getconf to find HOST_NAME_MAX at runtime.libretools-20140515

This is at the suggestion of Roman Neuhauser, who emailed Dave Reisner and
me.

1 files changed, 1 insertions, 2 deletions

diff --git a/arch-nspawn.in b/arch-nspawn.in
index e8b68cf..6c9a102 100644
--- a/arch-nspawn.in
+++ b/arch-nspawn.in
@@ -96,8 +96,7 @@ eval $(grep '^CARCH=' "$working_dir/etc/makepkg.conf")
 
 machine_name="${working_dir//[![:alnum:]_-]/-}"
 machine_name="${machine_name#-}"
-#HOST_NAME_MAX="$(cpp -include limits.h <<<HOST_NAME_MAX | sed -n '$p')"
-HOST_NAME_MAX=64
+HOST_NAME_MAX="$(getconf HOST_NAME_MAX)"
 if [[ ${#machine_name} -gt "$HOST_NAME_MAX" ]]; then
 	machine_name="${machine_name:(-${HOST_NAME_MAX})}"
 	machine_name="${machine_name#-}"