add assume UTXO support

Dockerfile

@@ -88,6 +88,7 @@ COPY ./manager/target/${ARCH}-unknown-linux-musl/release/bitcoind-manager \
      ./actions/sendcoin.sh \
      ./actions/sendall.sh \
      ./actions/signmessage.sh \
+     /actions/assumeutxo.sh \
      ./actions/reindex_chainstate.sh \
      ./actions/prioritise-transaction.sh \
      ./check-rpc.sh \

actions/assumeutxo.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+set -e
+
+cat > input.json
+
+URL=$(jq -r '.["location"]' input.json)
+
+rm input.json
+
+mkdir -p /tmp/snap
+
+if [ -e "/tmp/snap/snapshot" ]; then
+    bitcoin-cli loadtxoutset /tmp/snap/snapshot &
+else
+    wget -q $URL -O /tmp/snap/snapshot
+    bitcoin-cli loadtxoutset /tmp/snap/snapshot &
+fi
+
+result="    {
+    \"version\": \"0\",
+    \"message\": \"Consult the logs to see the progression of the snapshot loading. / DO NOT RESTART UNTIL THE SNAPSHOT IS LOADED.\",
+    \"value\": null,
+    \"copyable\": false,
+    \"qr\": false
+}"
+
+echo $result

manifest.yaml

@@ -351,7 +351,28 @@ actions:
         description: "The message to sign."
         placeholder: ""
         nullable: false
-
+  assumeutxo:
+    name: "Assume UTXO"
+    description: "Use an UTXO snapshot for instant use of your node."
+    allowed-statuses:
+      - running
+    implementation:
+      type: docker
+      image: main
+      system: false
+      entrypoint: assumeutxo.sh
+      args: []
+      io-format: json
+      mounts:
+        main: /root/.bitcoin
+      inject: true
+    input-spec:
+      location:
+        type: string
+        name: "Snapshot URL"
+        description: "The URL where we download the snapshot"
+        placeholder: ""
+        nullable: false
 migrations:
   from:
     "*":