expect 脚本无法将密码发送到 cryptsetup

Question

我想要自动化的与 cryptsetup 的简单交互是这样的：

cryptsetup luksFormat /dev/loop20
WARNING: Device /dev/loop20 already contains a 'crypto_LUKS' superblock signature.

WARNING!
========
This will overwrite data on /dev/loop20 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter passphrase for /dev/loop20: 
Verify passphrase: 

以下期望脚本尝试执行此操作：

spawn cryptsetup luksFormat /dev/loop20
expect "yes): " { send "YES\n" }
expect ": " 
send "passphrase\n"
expect ": "  
send "passphrase\n"
expect eof

虽然 YES 被正确发送，但它会在密码提示处挂起。我也尝试使用 此外 在发送命令中。

相同的脚本结构适用于 ssh 密码或 sudo 密码提示，所以我有点迷失这里的不同之处。我知道有一些“无预期”的方法，例如 echo passphrase | cryptsetup ...，但我真的很想了解根本问题以及是否有解决方案。

Answer 1

meuh 的评论是解决方案：密码提示后我需要稍等一下。

所以这有效：

spawn cryptsetup luksFormat /dev/loop20
expect "yes): " { send "YES\n" }
expect ": " 
sleep 1
send "passphrase\n"
expect ": "  
sleep 1
send "passphrase\n"
expect eof

谢谢！

Answer 2

将超时值设置为-1或一个大数字

    spawn cryptsetup luksFormat /dev/loop20
    set timeout -1
    expect "Are you sure? (Type uppercase yes): " { send "YES\n" }
    expect "Enter passphrase for /dev/loop20: " 
    send "passphrase\n"
    expect "Verify passphrase: "  
    send "passphrase\n"
    expect eof