How can I map an SSH key into Docker?

[kgilpin]

My SUMMONENVFILE can't be interpreted by Docker.

✗ summon docker run --env-file "@SUMMONENVFILE" myapp
docker: poorly formatted environment: variable '-----END RSA PRIVATE KEY-----' has white spaces.

Here's what it looks like:

✗ summon cat @SUMMONENVFILE                                        
SSH_PRIVATE_KEY_PATH=-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEAqLVITDJKy1KHfHG/SKvM07CjP/D7XrAr3Mz2UKzslnxgJKgeA8hENPGuj83Q
...
iY5dzCLuKMiIiPUHfDtrqaNLH+anyJtjmW9Fb1cWFOJLhWVkJAvYeVawwFBooUK1h9cPR728ngsa
5F7/sDUzQZBmRYnpwWFrWrEE1NwvsIWsQ31WIRhs/Xxp9A36ZPnxXWyOtw0XTbd8PmBaYA==
-----END RSA PRIVATE KEY-----

[dustinmm80]

This is a bug in how Docker parses the env file.

moby/moby#12997

Lots of activity on this thread - let's see if they resolve it before implementing a workaround.

[ryanprior]

As of September 2017 there appears to be no action taken by Docker to remedy this nor any discussion of a workaround. For now the answer to the question is: you can't use @SUMMONENVFILE with Docker if your secrets contain newlines.