hack(sysvinit): On *BSD, create /run as symlink (canonical#4677)

On *BSD, `/run` is not ephemeral, but the way cloud-init behaves, it
expects it to be.
This is hack is partial fix for canonicalGH-4180 / canonicalGH-4231.
But to be good Unix citizens, we should still make /run relocatable in
the code and in the installer.

Sponsored by: The FreeBSD Foundation
Fixes canonicalGH-4180
Fixes canonicalGH-4231

sysvinit/freebsd/cloudinitlocal.tmpl

@@ -15,10 +15,19 @@ PATH="{{ prefix }}/sbin:{{ prefix }}/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 
 name="cloudinitlocal"
 command="{{prefix}}/bin/cloud-init"
+start_precmd="cloudlocal_precmd"
 start_cmd="cloudlocal_start"
 stop_cmd=":"
 rcvar="cloudinit_enable"
 
+cloudlocal_precmd()
+{
+    if ! test -L /run ; then
+       rm -rf /run
+       ln -s /var/run /run
+    fi
+}
+
 cloudlocal_start()
 {
     echo -n "${command} starting"

sysvinit/freebsd/dsidentify.tmpl

@@ -17,10 +17,19 @@ PATH="{{ prefix }}/sbin:{{ prefix }}/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 
 name="dsidentify"
 command="{{ prefix }}/lib/cloud-init/ds-identify"
+start_precmd="dsidentify_precmd"
 start_cmd="dsidentify_start"
 stop_cmd=":"
 rcvar="cloudinit_enable"
 
+dsidentify_precmd()
+{
+    if ! test -L /run ; then
+       rm -rf /run
+       ln -s /var/run /run
+    fi
+}
+
 dsidentify_start()
 {
     if checkyesno cloudinit_dsidentify_enable; then

sysvinit/netbsd/cloudinitlocal.tmpl

@@ -13,7 +13,17 @@ That makes it easy for image builders to create images without ``dsidentify``.
 $_rc_subr_loaded . /etc/rc.subr
 
 name="cloudinitlocal"
+start_precmd="cloud_init_local_precmd"
 start_cmd="start_cloud_init_local"
+
+cloud_init_local_precmd()
+{
+    if ! test -L /run ; then
+       rm -rf /run
+       ln -s /var/run /run
+    fi
+}
+
 start_cloud_init_local()
 {
     test -e {{prefix}}/etc/cloud/cloud-init.disabled \

sysvinit/netbsd/dsidentify.tmpl

@@ -8,7 +8,17 @@
 $_rc_subr_loaded . /etc/rc.subr
 
 name="dsidentify"
+start_precmd="dsidentify_precmd"
 start_cmd="start_dsidentify"
+
+dsidentify_precmd()
+{
+    if ! test -L /run ; then
+       rm -rf /run
+       ln -s /var/run /run
+    fi
+}
+
 start_dsidentify()
 {
     test -e {{prefix}}/etc/cloud/cloud-init.disabled \

sysvinit/openbsd/cloudinitlocal.tmpl

@@ -17,6 +17,13 @@ daemon_user=root
 rc_bg="YES" # (undefined or "YES")
 rc_usercheck="YES"
 
+rc_pre() {
+    if ! test -L /run ; then
+       rm -rf /run
+       ln -s /var/run /run
+    fi
+}
+
 rc_start() {
     if test -e /etc/cloud/cloud-init.disabled; then
         echo -n "cloud-init is disabled via cloud-init.disabled file." | logger -t ${daemon}

tools/build-on-openbsd

@@ -44,6 +44,11 @@ else
     RC_LOCAL="/etc/rc.local"
     RC_LOCAL_CONTENT="
 
+if ! test -L /run ; then
+    rm -rf /run
+    ln -s /var/run /run
+fi
+
 /usr/lib/cloud-init/ds-identify
 
 cloud-init init --local