Parallelise removal script

deployment/proxmox/remove.sh

@@ -11,6 +11,9 @@ readonly apiurl=https://192.168.51.81:8006/api2/json
 ## now, let us just use `node051` everywhere.
 readonly node=node051
 
+readonly tmpdir=/tmp/proxmox-provision-$RANDOM$RANDOM
+mkdir $tmpdir
+
 ################################################################################
 ## Parse arguments
 
@@ -35,7 +38,8 @@ Others:
 EOF
 }
 
-die () { printf "$@"; printf '\n'; help; exit 2; }
+die () { printf '\033[31m'; printf "$@"; printf '\033[0m\n'; exit 2; }
+die_with_help () { printf '\033[31m'; printf "$@"; printf '\033[0m\n'; help; exit 2; }
 
 while [ $# -gt 0 ]; do
   argument=$1
@@ -46,7 +50,7 @@ while [ $# -gt 0 ]; do
 
     -h|-\?|--help) help; exit 0 ;;
 
-    -*) die 'Unknown argument: `%s`.' "$argument" ;;
+    -*) die_with_help 'Unknown argument: `%s`.' "$argument" ;;
 
     *) vmids="$vmids $argument" ;;
   esac
@@ -56,15 +60,13 @@ if [ -z "$username" ] || [ -z "$password" ]; then
   if [ -f .proxmox ]; then
     { read username; read password; } < .proxmox
   else
-    die 'Required: `--username` and `--password`.\n'
+    die_with_help 'Required: `--username` and `--password`.\n'
   fi
 fi
 
 ################################################################################
 ## Getting started
 
-from_response () { echo "$response" | jq -r "$1"; }
-
 printf 'Authenticating...'
 response=$(
     http \
@@ -73,65 +75,89 @@ response=$(
         "username=$username" \
         "password=$password"
     )
-readonly csrfToken=$(from_response .data.CSRFPreventionToken)
-readonly ticket=$(from_response .data.ticket)
+readonly ticket=$(echo "$response" | jq -r .data.ticket)
+readonly csrfToken=$(echo "$response" | jq -r .data.CSRFPreventionToken)
 printf ' done.\n'
 
+acquire_lock () {
+  until mkdir $tmpdir/lock-$1 2>/dev/null; do sleep 1; done
+}
+release_lock () {
+  rmdir $tmpdir/lock-$1
+}
+
 proxmox () {
-  response=$(
+  acquire_lock proxmox
   http \
     --verify no \
     --form \
     "$@" \
     "Cookie:PVEAuthCookie=$ticket" \
     "CSRFPreventionToken:$csrfToken"
-  )
+  release_lock proxmox
 }
 
-wait_ () {
-  upid=$1
+## Synchronous variant for when the `proxmox` function would just respond an
+## UPID in the `data` JSON field.
+proxmox_sync () (
+  response=$(proxmox "$@")
+  upid=$(echo "$response" | jq -r .data)
+
   while :; do
-    proxmox GET $apiurl/nodes/$node/tasks/$upid/status
-    status=$(from_response .data.status)
+    response=$(proxmox GET $apiurl/nodes/$node/tasks/$upid/status)
+    status=$(echo "$response" | jq -r .data.status)
+
     case $status in
-      running) printf '.'; sleep 1 ;;
+      running) sleep 1 ;;
       stopped) break ;;
-      *) printf ' unexpected status: `%s`\n' "$status"; exit 2 ;;
+      *) die 'unexpected status: `%s`' "$status" ;;
     esac
   done
-}
+)
 
 ################################################################################
 ## Stop VM
 
 stop_vm () {
-  printf 'Stopping VM %d...' $1
+  printf 'Stopping VM %d...\n' $1
 
-  proxmox POST $apiurl/nodes/$node/qemu/$1/status/stop \
+  proxmox_sync POST $apiurl/nodes/$node/qemu/$1/status/stop \
     'overrule-shutdown'==1
 
-  wait_ $(from_response .data)
-  printf ' done.\n'
+  printf 'done stopping VM %d.\n' $1
 }
 
 ################################################################################
 ## Delete VM
 
 delete_vm () {
-  printf 'Deleting VM %d...' $1
+  printf 'Deleting VM %d...\n' $1
 
-  proxmox DELETE $apiurl/nodes/$node/qemu/$1 \
+  proxmox_sync DELETE $apiurl/nodes/$node/qemu/$1 \
     'destroy-unreferenced-disks'==1 \
     'purge'==1
 
-  wait_ $(from_response .data)
-  printf ' done.\n'
+  printf 'done deleting VM %d.\n' $1
 }
 
 ################################################################################
 ## Main loop
 
+printf 'Removing VMs%s...\n' "$vmids"
+
+remove_vm () {
+  stop_vm $1
+  delete_vm $1
+}
+
 for vmid in $vmids; do
-  stop_vm $vmid
-  delete_vm $vmid
+  remove_vm $vmid &
 done
+wait
+
+printf 'done removing VMs%s.\n' "$vmids"
+
+################################################################################
+## Cleanup
+
+rm -Rf $tmpdir