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克隆链上已验证的合约

要将链上已验证的合约克隆为 Forge 项目，请使用 forge clone，例如以以太坊主网的 WETH9 为例：

$ forge clone 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 WETH9

这将创建一个新的目录 WETH9，将其配置为一个 Foundry 项目，并将合约的所有源代码克隆到其中。这还会初始化一个新的 git 仓库。

Downloading the source code of 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 from Etherscan...
Initializing /home/zhan4987/WETH9...
Installing forge-std in /home/zhan4987/WETH9/lib/forge-std (url: Some("https://github.com/foundry-rs/forge-std"), tag: None)
Cloning into '/home/zhan4987/WETH9/lib/forge-std'...
remote: Enumerating objects: 2243, done.
remote: Counting objects: 100% (2238/2238), done.
remote: Compressing objects: 100% (778/778), done.
remote: Total 2243 (delta 1489), reused 2097 (delta 1391), pack-reused 5
Receiving objects: 100% (2243/2243), 649.07 KiB | 8.89 MiB/s, done.
Resolving deltas: 100% (1489/1489), done.
    Installed forge-std v1.8.1
    Initialized forge project
Collecting the creation information of 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 from Etherscan...
Waiting for 5 seconds to avoid rate limit...
[⠊] Compiling...
[⠒] Compiling 1 files with 0.4.19
[⠢] Solc 0.4.19 finished in 9.50ms
Compiler run successful!

克隆的 Forge 项目除了普通 Forge 项目所需的文件外，还带有一个额外的 .clone.meta 元数据文件。

让我们看看 .clone.meta 文件的样子：

{
  "path": "src/Contract.sol",
  "targetContract": "WETH9",
  "address": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
  "chainId": 1,
  "creationTransaction": "0xb95343413e459a0f97461812111254163ae53467855c0d73e0f1e7c5b8442fa3",
  "deployer": "0x4f26ffbe5f04ed43630fdc30a87638d53d0b0876",
  "constructorArguments": "0x",
  "storageLayout": {
    "storage": [],
    "types": {}
  }
}

clone.meta 是一个紧凑的 JSON 数据文件，包含链上合约实例的信息，例如合约地址、构造函数参数等。有关元数据的更多详细信息，请参见 reference。