MarcoFalke 92dcbe9cc3 Merge bitcoin/bitcoin#23395: util: Add -shutdownnotify option ...

d96d97ad30  doc: Add release note for shutdownnotify. (klementtan)
0bd73e2c45 util: Add -shutdownnotify option. (klementtan)

Pull request description:

  **Description**: Similar to `-startupnotify`, this PR adds a new option to allow users to specify a command to be executed when Bitcoin Core shuts down.

  **Note**: The `shutdownnotify` commands will not be executed if bitcoind shut down due to *unexpected* reasons (ie `killall -9 bitcoind`).

  ### Testing:
  **Normal shutdown commands**
  ```
  # start bitcoind with shutdownnotify optioin
  ./src/bitcoind -signet -shutdownnotify="touch foo.txt"

  # shutdown bitcoind
  ./src/bitcoin-cli -signet stop

  # check that foo.txt has been created
  ```

  **Final RPC call**
  Commands:
  ```
  $  ./src/bitcoind -signet -nolisten -noconnect -shutdownnotify="./src/bitcoin-cli -signet getblockchaininfo > tmp.txt"
  $ ./src/bitcoin-cli stop
  $ cat tmp.txt
  ```
  <details>
  <summary>Screen Shot</summary>

  ![image](https://user-images.githubusercontent.com/49265907/141186183-cbc6f82c-400d-4a8b-baba-27c0346c2c8a.png)
  </details>

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Tree-SHA512: 16f7406fd232e8b97aea5e58854c84755b0c35c88cb3ef9ee123b29a1475a376122b1e100da860cc336d4d657e6046a70e915fdb9b70c9fd097c6eef1b028161

2023-01-19 10:34:54 +01:00

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