From cc65b80eb0bebe0e2d61c4e4b413b3bac729cf39 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Nov=C3=BD?= <onovy@debian.org>
Date: Fri, 5 Jun 2020 09:47:08 +0200
Subject: [PATCH] Check if port 80 is free before starting during install

---
 debian/control               | 3 +++
 debian/nginx-core.postinst   | 7 ++++++-
 debian/nginx-extras.postinst | 7 ++++++-
 debian/nginx-light.postinst  | 7 ++++++-
 4 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/debian/control b/debian/control
index d1fc34b..4f00178 100644
--- a/debian/control
+++ b/debian/control
@@ -75,6 +75,7 @@ Depends: libnginx-mod-http-geoip (= ${binary:Version}),
          libnginx-mod-stream (= ${binary:Version}),
          libnginx-mod-stream-geoip (= ${binary:Version}),
          nginx-common (= ${source:Version}),
+         iproute2,
          ${misc:Depends},
          ${shlibs:Depends}
 Breaks: nginx (<< 1.4.5-1),
@@ -150,6 +151,7 @@ Package: nginx-light
 Architecture: any
 Depends: libnginx-mod-http-echo (= ${binary:Version}),
          nginx-common (= ${source:Version}),
+         iproute2,
          ${misc:Depends},
          ${shlibs:Depends}
 Breaks: nginx (<< 1.4.5-1)
@@ -196,6 +198,7 @@ Depends: libnginx-mod-http-auth-pam (= ${binary:Version}),
          libnginx-mod-stream-geoip (= ${binary:Version}),
          libnginx-mod-stream-geoip2 (= ${binary:Version}),
          nginx-common (= ${source:Version}),
+         iproute2,
          ${misc:Depends},
          ${shlibs:Depends}
 Breaks: nginx (<< 1.4.5-1)
diff --git a/debian/nginx-core.postinst b/debian/nginx-core.postinst
index 2a1730f..b43571a 100644
--- a/debian/nginx-core.postinst
+++ b/debian/nginx-core.postinst
@@ -24,7 +24,12 @@ if [ -x /etc/init.d/nginx ]; then
     invoke-rc.d nginx upgrade || invoke-rc.d nginx restart
     exit $?
   else
-    invoke-rc.d nginx start || exit $?
+    if [ -z "$(ss -nlt 'sport = 80' | grep -v ^State)" ]; then
+      invoke-rc.d nginx start || exit $?
+    else
+      echo "Not attempting to start NGINX, port 80 is already in use."
+      exit 0
+    fi
   fi
 fi
 
diff --git a/debian/nginx-extras.postinst b/debian/nginx-extras.postinst
index 2a1730f..b43571a 100644
--- a/debian/nginx-extras.postinst
+++ b/debian/nginx-extras.postinst
@@ -24,7 +24,12 @@ if [ -x /etc/init.d/nginx ]; then
     invoke-rc.d nginx upgrade || invoke-rc.d nginx restart
     exit $?
   else
-    invoke-rc.d nginx start || exit $?
+    if [ -z "$(ss -nlt 'sport = 80' | grep -v ^State)" ]; then
+      invoke-rc.d nginx start || exit $?
+    else
+      echo "Not attempting to start NGINX, port 80 is already in use."
+      exit 0
+    fi
   fi
 fi
 
diff --git a/debian/nginx-light.postinst b/debian/nginx-light.postinst
index 2a1730f..b43571a 100644
--- a/debian/nginx-light.postinst
+++ b/debian/nginx-light.postinst
@@ -24,7 +24,12 @@ if [ -x /etc/init.d/nginx ]; then
     invoke-rc.d nginx upgrade || invoke-rc.d nginx restart
     exit $?
   else
-    invoke-rc.d nginx start || exit $?
+    if [ -z "$(ss -nlt 'sport = 80' | grep -v ^State)" ]; then
+      invoke-rc.d nginx start || exit $?
+    else
+      echo "Not attempting to start NGINX, port 80 is already in use."
+      exit 0
+    fi
   fi
 fi