Question

我需要读取一个env变量，该变量必须在导出时引用

export ENV_QUOTES="cat\nhat" # This is actually a rsa private key
export ENV_NO_QUOTES=cat\nhat

当我在引用的env var中读到它时，它没有注册转义的换行符：

import os
env_var_no_quotes = os.environ['ENV_NO_QUOTES']
env_var = os.environ['ENV_QUOTES']
for idx, v in enumerate(env_var_no_quotes):
    print(idx, v, env_var[idx])

输出：

0 c c
1 a a
2 t t
3 n \
4 h n
5 a h
6 t a

如何让python识别引用的env变种的换行符？私钥的实际输出print如下所示：

# Non quoted
-----BEGIN PRIVATE KEY-----
ffaffdsafsdeeekqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCltThZlt88aAn8
f2MlQsV4Nv9TEhBj8WUypfGc148FedpTRraNyE3f9bZ4u4MJC34vI9zuqf5hNrX+
+w+eYrPJwbS4CvA3Ww2znjCfKK4u3n3P522LTGNxAoGBAK5AA0twCSifwIPIlIsZ
psGtFIEJpc6sJ4+LgVzTW/5EwreMHMnx3tQTaVi6pVIJTqjaMJp5SAAUlPrl5zZM
gsVgtwyXMMqlKNt9wMdBH+ir7oJsppC+DjIRbpCa8U6nEG4Wij5qVeRJ8DVV8NAM
C5Tc+6qgzVZRaXXkCStZA/PK
    -----END PRIVATE KEY-----

    # Quoted
-----BEGIN PRIVATE KEY-----\nMIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCltThZlt88aAn8\nf2MlQsV4Nv9TEhBj8WUypfGc148FedpTRraNyE3f9bZ4u4MJC34vI9zuqf5hNrX+\nW+UfXJkPLfemupraI5sTWyFCwX7ZYOd5I7vyRoqSii4MHCXlg8zWySrjwirwou87\nn18zSyA30fu3kuHBDlHFnRVw+Ag+M/XjesRcz5Q+KQ9o/MnpcZcYQ7sZU5GntqCw\n3ZNgb68Cla87jbhvlkjfdN77IcLJypuwCMZeyHeQYNtgxLyE0o2Te5ddAjvD59uS\nML69iuQqpvPjpuBgZnReKX3oZusU/o6qgzVZRaXXkCStZA/PK\n-----END PRIVATE KEY-----\n

Answer 1

如果您无法更改shell脚本，请将输入正确地包含换行文字（这是更好的方法！），您只需在Python中使用string.sub()来替换r'\n' （这是变量实际包含的内容）'\n'（这是你想要的）：

env_var = os.environ['ENV_QUOTES'].replace(r'\n', '\n')

那就是说，在shell方面，考虑一下：

# in bash or ksh, not POSIX sh
ENV_QUOTES=$'cat\nhat'    # literal newline, not '\' followed by 'n'

...或...

# in any POSIX shell
orig_shell_var='cat\nhat'                 # two characters, '\' then 'n'
printf -v ENV_QUOTES %b "$orig_shell_var" # evaluated as format string, now has newline
export ENV_QUOTES

读取引用的环境变量新行

1 个答案: