审查了关于 SO 的相关文章，但没有成功。

我在 macOS 上：

安装 Rust OK：

rustup update nightly
rustup update stable
rustup target add wasm32-unknown-unknown --toolchain nightly

然后安装了这个：

XX-MacBook-Air-2 substrate-node-template % git clone -b v2.0.0 --depth 1 https://github.com/substrate-developer-hub/substrate-node-template
Cloning into 'substrate-node-template'...
remote: Enumerating objects: 46, done.
remote: Counting objects: 100% (46/46), done.
remote: Compressing objects: 100% (42/42), done.
remote: Total 46 (delta 0), reused 29 (delta 0), pack-reused 0
Receiving objects: 100% (46/46), 69.55 KiB | 962.00 KiB/s, done.
Note: switching to '655bfdc6fc922d117849cbcf808ee5bf2dfa1d53'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

然后这个：

cd substrate-node-template/ 

和这个：

XX-MacBook-Air-2 substrate-node-template % git checkout -b my-first-substrate-chain 

fatal: cannot lock ref 'refs/heads/my-first-substrate-chain': Unable to create '/Users/patrickburns/substrate-node-template/.git/refs/heads/my-first-substrate-chain.lock': Permission denied

非常感谢有关如何解决此错误的任何想法。

回答

$ git clone -b v2.0.0 --depth 1 https://github.com/substrate-developer-hub/substrate-node-template
$ cd substrate-node-template/
$ git checkout -b br
Switched to a new branch 'br'