From df2d690341ba3e5e1c1ed87f12c206f3cfa0ab45 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Mon, 29 Feb 2016 23:12:19 -0500
Subject: systemd/cloud-init-generator: add a generator to support disabling

This gets installed in /lib/systemd/system/cloud-init.target
and then is called to generate the symlink (or not generate the
symlink) for the cloud-init target.

The end result is cloud-init can be completely disabled
by:
 touch /etc/cloud/cloud-init.disabled
or a kernel command line with 'cloud-init=disabled'
---
 systemd/cloud-init-generator | 123 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100755 systemd/cloud-init-generator

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
new file mode 100755
index 00000000..0c698d6b
--- /dev/null
+++ b/systemd/cloud-init-generator
@@ -0,0 +1,123 @@
+#!/bin/sh
+set -f
+
+LOG=""
+DEBUG_LEVEL=2
+LOG_D="/run"
+ENABLE="enabled"
+DISABLE="disabled"
+CLOUD_SYSTEM_TARGET="/lib/systemd/system/cloud-init.target"
+CLOUD_TARGET_NAME="cloud-init.target"
+
+debug() {
+    local lvl="$1"
+    shift
+    [ "$lvl" -gt "$DEBUG_LEVEL" ] && return
+    if [ -z "$LOG" ]; then
+        local log="$LOG_D/${0##*/}-generator.log"
+        { : > "$log"; } >/dev/null 2>&1 && LOG="$log" ||
+            LOG="/dev/kmsg"
+    fi
+    echo "$@" >> "$LOG"
+}
+
+etc_file() {
+    local pprefix="${1:-/etc/cloud/cloud-init.}"
+    _RET="unset"
+    [ -f "${pprefix}.$ENABLE" ] && _RET="$ENABLE" && return 0
+    [ -f "${pprefix}.$DISABLE" ] && _RET="$DISABLE" && return 0
+    return 0
+}
+
+read_proc_cmdline() {
+    local out=""
+    if [ "$container" = "lxc" ]; then
+        _RET=""
+        return 0
+    fi
+
+    if systemd-detect-virt --container --quiet; then
+        _RET=""
+        return 0
+    fi
+
+    read _RET < /proc/cmdline
+}
+
+kernel_cmdline() {
+    local cmdline="" tok=""
+    if [ -n "${KERNEL_CMDLINE+$KERNEL_CMDLINE}" ]; then
+        cmdline=${KERNEL_CMDLINE}
+        debug 1 "kernel command line from env KERNEL_CMDLINE: $cmdline"
+    elif read_proc_cmdline; then
+        read_proc_cmdline && cmdline="$_RET"
+        debug 1 "kernel command line from /proc/cmdline: $cmdline"
+    fi
+    _RET="unset"
+    cmdline=" $cmdline "
+    tok=${cmdline##* cloud-init=}
+    [ "$tok" = "$cmdline" ] && _RET="unset"
+    tok=${tok%% *}
+    [ "$tok" = "$ENABLE" -o "$tok" = "$DISABLE" ] && _RET="$tok"
+    return 0
+}
+
+default() {
+    _RET="$ENABLE"
+}
+
+main() {
+    local normal_d="$1" early_d="$2" late_d="$3"
+    local target_name="multi-user.target" gen_d="$early_d"
+    local link_path="$gen_d/${target_name}.wants/${CLOUD_TARGET_NAME}"
+
+    #LOG_D="${gen_d:-${LOG_D}}"
+    debug 1 "$0 normal=$normal_d early=$early_d late=$late_d"
+    debug 2 "$0 $*"
+
+    local search result="error" ret=""
+    for search in kernel_cmdline etc_file default; do
+        if $search; then
+            debug 1 "$search found $_RET"
+            [ "$_RET" = "$ENABLE" -o "$_RET" = "$DISABLE" ] && result=$_RET
+        else
+            ret=$?
+            debug 0 "search $search returned $ret"
+        fi
+    done
+    
+    if [ "$result" = "$ENABLE" ]; then
+        if [ -e "$link_path" ]; then
+                debug 1 "already enabled: no change needed"
+        else
+            [ -d "${link_path%/*}" ] || mkdir -p "${link_path%/*}" ||
+                debug 0 "failed to make dir $link_path"
+            if ln -snf "$CLOUD_SYSTEM_TARGET" "$link_path"; then
+                debug 1 "enabled via $link_path -> $CLOUD_SYSTEM_TARGET"
+            else
+                ret=$?
+                debug 0 "[$ret] enable failed:" \
+                    "ln $CLOUD_SYSTEM_TARGET $link_path"
+            fi
+        fi
+    elif [ "$result" = "$DISABLE" ]; then
+        if [ -f "$link_path" ]; then
+            if rm -f "$link_path"; then
+                debug 1 "disabled. removed existing $link_path"
+            else
+                ret=$?
+                debug 0 "[$ret] disable failed, remove $link_path"
+            fi
+        else
+            debug 1 "already disabled: no change needed"
+        fi
+    else
+        debug 0 "unexpected result '$result'"
+        ret=3
+    fi
+    return $ret
+}
+
+main "$@"
+
+# vi: ts=4 expandtab
-- 
cgit v1.2.3


From 4b22f00f02c6cccd88a81f05db8cc33a4e9a7419 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Mon, 29 Feb 2016 23:20:01 -0500
Subject: be less verbose by default

---
 systemd/cloud-init-generator | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index 0c698d6b..c9900394 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -2,7 +2,7 @@
 set -f
 
 LOG=""
-DEBUG_LEVEL=2
+DEBUG_LEVEL=1
 LOG_D="/run"
 ENABLE="enabled"
 DISABLE="disabled"
@@ -71,7 +71,6 @@ main() {
     local target_name="multi-user.target" gen_d="$early_d"
     local link_path="$gen_d/${target_name}.wants/${CLOUD_TARGET_NAME}"
 
-    #LOG_D="${gen_d:-${LOG_D}}"
     debug 1 "$0 normal=$normal_d early=$early_d late=$late_d"
     debug 2 "$0 $*"
 
-- 
cgit v1.2.3


From af5d2a102c029da4b853a3bc42a6e23ce3a40fe6 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Mon, 29 Feb 2016 23:38:40 -0500
Subject: remove unused var

---
 systemd/cloud-init-generator | 1 -
 1 file changed, 1 deletion(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index c9900394..d97b58d9 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -30,7 +30,6 @@ etc_file() {
 }
 
 read_proc_cmdline() {
-    local out=""
     if [ "$container" = "lxc" ]; then
         _RET=""
         return 0
-- 
cgit v1.2.3


From af3653032704f79f418e976d02994c273e25f87f Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Tue, 1 Mar 2016 00:28:52 -0500
Subject: 2 fixups

---
 systemd/cloud-init-generator | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index d97b58d9..d976ae0b 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -24,8 +24,8 @@ debug() {
 etc_file() {
     local pprefix="${1:-/etc/cloud/cloud-init.}"
     _RET="unset"
-    [ -f "${pprefix}.$ENABLE" ] && _RET="$ENABLE" && return 0
-    [ -f "${pprefix}.$DISABLE" ] && _RET="$DISABLE" && return 0
+    [ -f "${pprefix}$ENABLE" ] && _RET="$ENABLE" && return 0
+    [ -f "${pprefix}$DISABLE" ] && _RET="$DISABLE" && return 0
     return 0
 }
 
@@ -77,7 +77,8 @@ main() {
     for search in kernel_cmdline etc_file default; do
         if $search; then
             debug 1 "$search found $_RET"
-            [ "$_RET" = "$ENABLE" -o "$_RET" = "$DISABLE" ] && result=$_RET
+            [ "$_RET" = "$ENABLE" -o "$_RET" = "$DISABLE" ] &&
+                result=$_RET && break
         else
             ret=$?
             debug 0 "search $search returned $ret"
-- 
cgit v1.2.3


From f4c25ab96c572e0a503bb211a11cd2641ac321a3 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Thu, 3 Mar 2016 16:53:49 -0500
Subject: consume KERNEL_CMDLINE even if set to "". explain 'container'

---
 systemd/cloud-init-generator | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index d976ae0b..b09924ac 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -8,6 +8,8 @@ ENABLE="enabled"
 DISABLE="disabled"
 CLOUD_SYSTEM_TARGET="/lib/systemd/system/cloud-init.target"
 CLOUD_TARGET_NAME="cloud-init.target"
+# lxc sets 'container', but lets make that explicitly a global
+CONTAINER="${container}"
 
 debug() {
     local lvl="$1"
@@ -30,7 +32,7 @@ etc_file() {
 }
 
 read_proc_cmdline() {
-    if [ "$container" = "lxc" ]; then
+    if [ "$CONTAINER" = "lxc" ]; then
         _RET=""
         return 0
     fi
@@ -45,7 +47,8 @@ read_proc_cmdline() {
 
 kernel_cmdline() {
     local cmdline="" tok=""
-    if [ -n "${KERNEL_CMDLINE+$KERNEL_CMDLINE}" ]; then
+    if [ -n "${KERNEL_CMDLINE+x}" ]; then
+        # use KERNEL_CMDLINE if present in environment even if empty
         cmdline=${KERNEL_CMDLINE}
         debug 1 "kernel command line from env KERNEL_CMDLINE: $cmdline"
     elif read_proc_cmdline; then
-- 
cgit v1.2.3


From 72c71196d701a1398963b52a30e9ab34a2579a49 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Thu, 3 Mar 2016 17:23:13 -0500
Subject: do not duplicate '-generator' in log ame

---
 systemd/cloud-init-generator | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index b09924ac..3bd2d6b3 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -16,7 +16,7 @@ debug() {
     shift
     [ "$lvl" -gt "$DEBUG_LEVEL" ] && return
     if [ -z "$LOG" ]; then
-        local log="$LOG_D/${0##*/}-generator.log"
+        local log="$LOG_D/${0##*/}.log"
         { : > "$log"; } >/dev/null 2>&1 && LOG="$log" ||
             LOG="/dev/kmsg"
     fi
-- 
cgit v1.2.3


From fa5c11836cec515dd23efcfabe9b736edd47c22a Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Thu, 3 Mar 2016 17:49:01 -0500
Subject: generator: be more clear on where kernel cmdline came from

---
 systemd/cloud-init-generator | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index 3bd2d6b3..eb0e1a77 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -33,15 +33,18 @@ etc_file() {
 
 read_proc_cmdline() {
     if [ "$CONTAINER" = "lxc" ]; then
+        _RET_MSG="ignored: \$container=$CONTAINER"
         _RET=""
         return 0
     fi
 
     if systemd-detect-virt --container --quiet; then
+        _RET_MSG="ignored: detect-virt is container"
         _RET=""
         return 0
     fi
 
+    _RET_MSG="/proc/cmdline"
     read _RET < /proc/cmdline
 }
 
@@ -53,7 +56,7 @@ kernel_cmdline() {
         debug 1 "kernel command line from env KERNEL_CMDLINE: $cmdline"
     elif read_proc_cmdline; then
         read_proc_cmdline && cmdline="$_RET"
-        debug 1 "kernel command line from /proc/cmdline: $cmdline"
+        debug 1 "kernel command line ($_RET_MSG): $cmdline"
     fi
     _RET="unset"
     cmdline=" $cmdline "
-- 
cgit v1.2.3


From d02a257063db96f487510b9841a9a396ef2675af Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Thu, 3 Mar 2016 22:46:37 -0500
Subject: mention link path in generator

---
 systemd/cloud-init-generator | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'systemd/cloud-init-generator')

diff --git a/systemd/cloud-init-generator b/systemd/cloud-init-generator
index eb0e1a77..9d1e22f0 100755
--- a/systemd/cloud-init-generator
+++ b/systemd/cloud-init-generator
@@ -114,7 +114,7 @@ main() {
                 debug 0 "[$ret] disable failed, remove $link_path"
             fi
         else
-            debug 1 "already disabled: no change needed"
+            debug 1 "already disabled: no change needed [no $link_path]"
         fi
     else
         debug 0 "unexpected result '$result'"
-- 
cgit v1.2.3