Add better name and description for environment variable

Signed-off-by: serhii.n <serhii.n@thescimus.com>

contrib/dockerd-rootless.sh

@@ -15,7 +15,7 @@
 # * DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=(builtin|slirp4netns|implicit): the rootlesskit port driver. Defaults to "builtin".
 # * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX=(auto|true|false): whether to protect slirp4netns with a dedicated mount namespace. Defaults to "auto".
 # * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP=(auto|true|false): whether to protect slirp4netns with seccomp. Defaults to "auto".
-# * DOCKERD_ROOTLESS_ROOTLESSKIT_ENABLE_HOST_LOOPBACK=(true|false): allow to enable host loopback and use 10.0.2.2 to connect to the host. Defaults to "false".
+# * DOCKERD_ROOTLESS_ROOTLESSKIT_DISABLE_HOST_LOOPBACK=(true|false): disallow to enable host loopback and use 10.0.2.2 (in the case of slirp4netns) to connect to the host loopback. Defaults to "true".
 
 # To apply an environment variable via systemd, create ~/.config/systemd/user/docker.service.d/override.conf as follows,
 # and run `systemctl --user daemon-reload && systemctl --user restart docker`:
@@ -72,7 +72,7 @@ fi
 : "${DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER:=builtin}"
 : "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX:=auto}"
 : "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP:=auto}"
-: "${DOCKERD_ROOTLESS_ROOTLESSKIT_ENABLE_HOST_LOOPBACK:=}"
+: "${DOCKERD_ROOTLESS_ROOTLESSKIT_DISABLE_HOST_LOOPBACK:=}"
 net=$DOCKERD_ROOTLESS_ROOTLESSKIT_NET
 mtu=$DOCKERD_ROOTLESS_ROOTLESSKIT_MTU
 if [ -z "$net" ]; then
@@ -101,7 +101,7 @@ if [ -z "$mtu" ]; then
 fi
 
 host_loopback="--disable-host-loopback"
-if [ "$DOCKERD_ROOTLESS_ROOTLESSKIT_ENABLE_HOST_LOOPBACK" = "true" ]; then
+if [ "$DOCKERD_ROOTLESS_ROOTLESSKIT_DISABLE_HOST_LOOPBACK" = "false" ]; then
 	host_loopback=""
 fi