Bug#1030923: [PATCH] debian/postinst: Use '--force-badname' option if 'adduser' package version is below '3.122'.

[Daniel Teichmann]

Otherwise use '--allow-bad-names' option (if adduser version is new enough).
Fixes: https://bugs.debian.org/1030923
---
 debian/postinst | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/debian/postinst b/debian/postinst
index bd92aa1..56c44ce 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -23,10 +23,18 @@ case "${1}" in
                 # setup mDNS Reflector system user account
                 if ! getent 'passwd' '_mdns.reflector' >'/dev/null'; then
                         echo 'Creating _mdns.reflector system user.' >&2
+                        # if adduser >= 3.122; then use --allow-bad-names
+                        # if not; then use --force-badname
+                        badname_option="--allow-bad-names"
+                        version=`dpkg-query --show --showformat='${Version}' adduser`
+                        if dpkg --compare-versions "$version" "lt" "3.122"; then
+                            badname_option="--force-badname"
+                        fi
+
                         adduser --system --no-create-home \
                                 --disabled-password --disabled-login \
                                 --shell /bin/false --group --home /dev/null \
-                                --allow-bad-names _mdns.reflector
+                                "$badname_option" _mdns.reflector
                 fi
 
                 # Enable cap_net_raw+ep for the mdns-reflector binary
-- 
2.30.2