Avoid duplication via common rootfs/ dir

.dockerignore

@@ -2,6 +2,7 @@
 
 !docker/coturn/alpine/
 !docker/coturn/debian/
+!docker/coturn/rootfs/
 
 !cmake/
 !CMakeLists.txt

docker/coturn/alpine/Dockerfile

@@ -78,6 +78,7 @@ RUN mkdir -p /out/ \
  && rm -f /out/etc/coturn/turnserver.conf.default
 
 # Install helper tools of Docker image.
+COPY docker/coturn/rootfs/ /out/
 COPY docker/coturn/alpine/rootfs/ /out/
 RUN chmod +x /out/usr/local/bin/docker-entrypoint.sh \
              /out/usr/local/bin/detect-external-ip.sh

docker/coturn/debian/Dockerfile

@@ -129,6 +129,7 @@ RUN mkdir -p /out/ \
  && rm -f /out/etc/coturn/turnserver.conf.default
 
 # Install helper tools of Docker image.
+COPY docker/coturn/rootfs/ /out/
 COPY docker/coturn/debian/rootfs/ /out/
 RUN chmod +x /out/usr/local/bin/docker-entrypoint.sh \
              /out/usr/local/bin/detect-external-ip.sh

docker/coturn/debian/rootfs/usr/local/bin/detect-external-ip.sh

@@ -1,115 +0,0 @@
-#!/usr/bin/env sh
-# shellcheck shell=dash
-
-#/ Use DNS to find out about the external IP of the running system.
-#/
-#/ This script is useful when running from a machine that sits behind a NAT.
-#/ Due to how NAT works, machines behind it belong to an internal or private
-#/ subnet, with a different address space than the external or public side.
-#/
-#/ Typically it is possible to make an HTTP request to a number of providers
-#/ that offer the external IP in their response body (eg: ifconfig.me). However,
-#/ why do a slow and heavy HTTP request, when DNS exists and is much faster?
-#/ Well established providers such as OpenDNS or Google offer special hostnames
-#/ that, when resolved, will actually return the IP address of the caller.
-#/
-#/ https://unix.stackexchange.com/questions/22615/how-can-i-get-my-external-ip-address-in-a-shell-script/81699#81699
-#/
-#/
-#/ Arguments
-#/ ---------
-#/
-#/ --ipv4
-#/
-#/   Find the external IPv4 address.
-#/   Optional. Default: Enabled.
-#/
-#/ --ipv6
-#/
-#/   Find the external IPv6 address.
-#/   Optional. Default: Disabled.
-
-
-
-# Shell setup
-# ===========
-
-# Shell options for strict error checking.
-for OPTION in errexit errtrace pipefail nounset; do
-    set -o | grep -wq "$OPTION" && set -o "$OPTION"
-done
-
-# Trace all commands (to stderr).
-#set -o xtrace
-
-
-
-# Shortcut: REAL_EXTERNAL_IP
-# ==========================
-
-if [ -n "${REAL_EXTERNAL_IP:-}" ]; then
-    echo "$REAL_EXTERNAL_IP"
-    exit 0
-fi
-
-
-
-# Parse call arguments
-# ====================
-
-CFG_IPV4="true"
-
-while [ $# -gt 0 ]; do
-    case "${1-}" in
-        --ipv4) CFG_IPV4="true" ;;
-        --ipv6) CFG_IPV4="false" ;;
-        *)
-            echo "Invalid argument: '${1-}'" >&2
-            exit 1
-            ;;
-    esac
-    shift
-done
-
-
-
-# Discover the external IP address
-# ================================
-
-if [ "$CFG_IPV4" = "true" ]; then
-    COMMANDS='dig @resolver1.opendns.com myip.opendns.com A -4 +short
-        dig @ns1.google.com o-o.myaddr.l.google.com TXT -4 +short | tr -d \"
-        dig @1.1.1.1 whoami.cloudflare TXT CH -4 +short | tr -d \"
-        dig @ns1-1.akamaitech.net whoami.akamai.net A -4 +short'
-
-    is_valid_ip() {
-        # Check if the input looks like an IPv4 address.
-        # Doesn't check if the actual values are valid; assumes they are.
-        echo "$1" | grep -Eq '^([0-9]{1,3}\.){3}[0-9]{1,3}$'
-    }
-else
-    COMMANDS='dig @resolver1.opendns.com myip.opendns.com AAAA -6 +short
-        dig @ns1.google.com o-o.myaddr.l.google.com TXT -6 +short | tr -d \"
-        dig @2606:4700:4700::1111 whoami.cloudflare TXT CH -6 +short | tr -d \"'
-
-    is_valid_ip() {
-        # Check if the input looks like an IPv6 address.
-        # It's almost impossible to check the IPv6 representation because it
-        # varies wildly, so just check that there are at least 2 colons.
-        [ "$(echo "$1" | awk -F':' '{print NF-1}')" -ge 2 ]
-    }
-fi
-
-echo "$COMMANDS" | while read -r COMMAND; do
-    if IP="$(eval "$COMMAND")" && is_valid_ip "$IP"; then
-        echo "$IP"
-        exit 100 # Exits the pipe subshell.
-    fi
-done
-
-if [ $? -eq 100 ]; then
-    exit 0
-else
-    echo "[$0] All providers failed" >&2
-    exit 1
-fi

docker/coturn/alpine/rootfs/usr/local/bin/detect-external-ip.sh → docker/coturn/rootfs/usr/local/bin/detect-external-ip.sh

@@ -103,7 +103,7 @@ fi
 echo "$COMMANDS" | while read -r COMMAND; do
     if IP="$(eval "$COMMAND")" && is_valid_ip "$IP"; then
         echo "$IP"
-        exit 100 # Exits the pipe subshell.
+        exit 100  # Exits the pipe subshell.
     fi
 done