Minor Improvements & Typo Fixen

* save `user-data` during main `tiny-cloud` init script instead of `tiny-cloud-final`
* allow manual setting of bootstrap state with...
  * `service tiny-cloud complete`
  * `service tiny-cloud incomplete`
* use `${VAR:=default}` idiom instead of `VAR=${VAR:-default}`
* fix inconsequential typo in `imds-net-sync`

README.md

@@ -105,21 +105,20 @@ any necessary `mdev` rules for device hotplug are set up.
 ### Main Phase
 
 The main `tiny-cloud` init script *does* depend on the cloud provider's IMDS
-data, and sets up instance's hostname and the cloud user's SSH keys before
-`sshd` starts.
-
-### Final Phase
-
-`tiny-cloud-final` should be the very last init script to run in the
-**default** runlevel.  By default, it saves the instance's user data to
-`/var/lib/cloud/user-data`; the directory overrideable via the `TINY_CLOUD_VAR`
-config setting.
+data; it saves the instance's user data to `/var/lib/cloud/user-data`, sets up
+instance's hostname, and installs the cloud user's SSH keys before `sshd`
+starts.
 
 If the user data is compressed, Tiny Cloud will decompress it.  Currently
 supported compression algorithms are `gzip`, `bzip2`, `unxz`, `lzma`, `lzop`,
 `lz4`, and `zstd`.  _(Note that `lz4` and `zstd` are not installed in Alpine
 by default, and would need to be added to the image.)_
 
+### Final Phase
+
+`tiny-cloud-final` should be the very last init script to run in the
+**default** runlevel.
+
 If the user data is a script starting with `#!/`, it will be executed; its
 output (combined STDOUT and STDERR) and exit code are saved to
 `/var/log/user-data.log` and `/var/log/user-data.exit`, respectively; the
@@ -144,10 +143,14 @@ To force the init scripts to re-run on the next boot...
 ```
 rm -f /var/lib/cloud/.bootstrap-complete
 ```
+or
+```
+service tiny-cloud incomplete
+```
 If you're instantiating an instance in order to create a new cloud image
 (using [Packer](https://packer.io), or some other means), you will need to
-remove this file before creating the image to ensure that instances using the
-new image will also run Tiny Cloud init scripts during their first boot.
+do this before creating the image to ensure that instances using the new
+image will also run Tiny Cloud init scripts during their first boot.
 
 ## Cloud Hotplug Modules
 

etc/init.d/tiny-cloud

@@ -2,6 +2,9 @@
 # vim:set ts=8 noet ft=sh:
 
 description="Tiny Cloud Bootstrap - main phase"
+extra_commands="complete incomplete"
+
+source /lib/tiny-cloud/init-main
 
 depend() {
 	need net
@@ -9,10 +12,13 @@ depend() {
 }
 
 start() {
-	source /lib/tiny-cloud/init-main
 
 	is_bootstrapped && return 0
 
+	ebegin "Saving Instance UserData"
+	save_userdata
+	eend $?
+
 	ebegin "Setting Instance Hostname"
 	set_hostname
 	eend $?
@@ -20,4 +26,8 @@ start() {
 	ebegin "Installing SSH Keys for $CLOUD_USER User"
 	set_ssh_keys "$CLOUD_USER"
 	eend $?
-}
+}
+
+# allow setting / unsetting of bootstrap state
+complete() { bootstrap_complete ; }
+incomplete() { bootstrap_incomplete ; }

etc/init.d/tiny-cloud-final

@@ -13,10 +13,6 @@ start() {
 
 	is_bootstrapped && return 0
 
-	ebegin "Saving Instance UserData"
-	save_userdata
-	eend $?
-
 	if is_userdata_script; then
 		ebegin "Executing UserData Script"
 		run_userdata

lib/tiny-cloud/aws/imds

@@ -3,7 +3,7 @@
 
 IMDS_HEADER="X-aws-ec2-metadata-token"
 IMDS_TOKEN_TTL_HEADER="X-aws-ec2-metadata-token-ttl-seconds"
-IMDS_TOKEN_TTL=${IMDS_TOKEN_TTL:-5}
+: "${IMDS_TOKEN_TTL:=5}"
 IMDS_URI="latest"
 
 _imds_token() {

lib/tiny-cloud/common

@@ -3,17 +3,17 @@
 
 # set defaults
 [ -f /etc/conf.d/tiny-cloud ] && source /etc/conf.d/tiny-cloud
-CLOUD="${CLOUD:-unknown}"
-CLOUD_USER=${CLOUD_USER:-alpine}
-TINY_CLOUD_LOGS=${TINY_CLOUD_LOGS:-/var/log}
-TINY_CLOUD_VAR=${TINY_CLOUD_VAR:-/var/lib/cloud}
+: "${CLOUD:=unknown}"
+: "${CLOUD_USER:=alpine}"
+: "${TINY_CLOUD_LOGS:=/var/log}"
+: "${TINY_CLOUD_VAR:=/var/lib/cloud}"
 
 log() {
     local facility="kern"
     local stderr
     local tag=$(basename "$0")
     while [ "${1:0:1}" = '-' ]; do
-        case "$1" in 
+        case "$1" in
             -f) facility="$2"; shift ;;
             -s) stderr=-s ;;
             -t) tag="$tag/$2"; shift ;;

lib/tiny-cloud/init-common

@@ -3,14 +3,17 @@
 
 # set defaults
 source /lib/tiny-cloud/common
-SKIP_INIT_ACTIONS=${SKIP_INIT_ACTIONS:-}
+: "${SKIP_INIT_ACTIONS:=}"
 
 # is initial bootstrap already done?
-is_bootstrapped() { [ -f "$TINY_CLOUD_VAR"/.bootstrap-complete ]; }
+is_bootstrapped() { [ -f "$TINY_CLOUD_VAR"/.bootstrap-complete ] ; }
 
 # indicate bootstrap is done
 bootstrap_complete() { touch "$TINY_CLOUD_VAR"/.bootstrap-complete ; }
 
+# indicate bootstrap isn't done
+bootstrap_incomplete() { rm -f "$TINY_CLOUD_VAR"/.bootstrap-complete ; }
+
 # should we skip this action?
 skip_action() {
     local action="$1"

lib/tiny-cloud/init-early

@@ -41,5 +41,4 @@ install_hotplugs() {
     done
 }
 
-HOTPLUG_TYPE=${HOTPLUG_TYPE:-mdev}
-[ -f /lib/tiny-cloud/"$HOTPLUG_TYPE" ] && source /lib/tiny-cloud/"$HOTPLUG_TYPE"
+[ -f /lib/tiny-cloud/"${HOTPLUG_TYPE:=mdev}" ] && source /lib/tiny-cloud/"$HOTPLUG_TYPE"

lib/tiny-cloud/init-final

@@ -8,36 +8,6 @@ match_header() {
     [ "$bytes" = "$(dd bs=1 count=${#bytes} if="$2" 2>/dev/null)" ]
 }
 
-save_userdata() {
-    skip_action save_userdata && return
-
-    local userdata="$TINY_CLOUD_VAR/user-data"
-    local tmpfile=$(mktemp "$userdata.XXXXXX")
-    local cmd
-
-    imds -e @userdata > "$tmpfile"
-    cmd="cat"
-    if ! skip_action decompress_userdata; then
-        if match_header '\037\213\010' "$tmpfile"; then
-            cmd="gzip -dc"
-        elif match_header 'BZh' "$tmpfile"; then
-            cmd="bzip2 -dc"
-        elif match_header '\3757zXZ\000' "$tmpfile"; then
-            cmd="unxz -c"
-        elif match_header '\135\0\0\0' "$tmpfile"; then
-            cmd="lzma -dc"
-        elif match_header '\211\114\132' "$tmpfile"; then
-            cmd="lzop -dc"
-        elif match_header '\002!L\030' "$tmpfile"; then
-            cmd="lz4 -dc"
-        elif match_header '(\265/\375' "$tmpfile"; then
-            cmd="zstd -dc"
-        fi
-    fi
-    $cmd "$tmpfile" > "$userdata"
-    rm "$tmpfile"
-}
-
 is_userdata_script() {
     head -n1 "$TINY_CLOUD_VAR/user-data" | grep -q "#!/"
 }

lib/tiny-cloud/init-main

@@ -36,4 +36,34 @@ set_ssh_keys() {
     chmod 600 "$keys_file"
     chown -R "$user:$group" "$ssh_dir"
     imds @ssh-keys > "$keys_file"
-}
+}
+
+save_userdata() {
+    skip_action save_userdata && return
+
+    local userdata="$TINY_CLOUD_VAR/user-data"
+    local tmpfile=$(mktemp "$userdata.XXXXXX")
+    local cmd
+
+    imds -e @userdata > "$tmpfile"
+    cmd="cat"
+    if ! skip_action decompress_userdata; then
+        if match_header '\037\213\010' "$tmpfile"; then
+            cmd="gzip -dc"
+        elif match_header 'BZh' "$tmpfile"; then
+            cmd="bzip2 -dc"
+        elif match_header '\3757zXZ\000' "$tmpfile"; then
+            cmd="unxz -c"
+        elif match_header '\135\0\0\0' "$tmpfile"; then
+            cmd="lzma -dc"
+        elif match_header '\211\114\132' "$tmpfile"; then
+            cmd="lzop -dc"
+        elif match_header '\002!L\030' "$tmpfile"; then
+            cmd="lz4 -dc"
+        elif match_header '(\265/\375' "$tmpfile"; then
+            cmd="zstd -dc"
+        fi
+    fi
+    $cmd "$tmpfile" > "$userdata"
+    rm "$tmpfile"
+}

sbin/imds-net-sync

@@ -7,13 +7,12 @@
 
 source /lib/tiny-cloud/common
 
-IFACE=${IFACE:-unknown}
-[ "$IFACE" = unknown ] && log -s crit "IFACE not set, aborting"
+[ "${IFACE:=unknown}" = unknown ] && log -s crit "IFACE not set, aborting"
 
 # kill interface's imds-net-sync daemon
-[ "$1" = '-k' ] && PHASE=pre=down && shift
+[ "$1" = '-k' ] && PHASE=pre-down && shift
 
-PHASE=${PHASE:-post-up}
+: "${PHASE:=post-up}"
 
 # route table number
 RTABLE=${IFACE#eth}