Is there a way to get the Docker Hub username of the current user?

Question

I see that ~/.dockercfg has your login credentials, but it is your email and not your username. I see that running docker login displays your username and prompts you to change it. But, you can you just get your username to put into a build script?

I don't see anything useful in the API docs. https://docs.docker.com/reference/api/docker-io_api/#user-login — Bruno Bronosky, Mar 29 '15 at 07:43

score 16 · Answer 1 · edited Aug 15 '16 at 16:33

16

Display the username with:

docker info | sed '/Username:/!d;s/.* //'

Store it in a variable with:

username=$(docker info | sed '/Username:/!d;s/.* //'); 
echo $username

Note that if you have bash history expansion (set +H) you will be unable to put double quotes around the command substitution (e.g. "$(cmd...)" because ! gets replaced with your last command. Escaping is very tricky with these nested expansions and using it unquoted as shown above is more readable and works.

edited Aug 15 '16 at 16:33

Bruno Bronosky

66,273
12
162
149

answered Aug 12 '16 at 22:20

Kevin Cantwell

1,092
14
19

I'll give you selected answer for the preferable use of `docker info` but I removed your useless use of grep. (Never combine a grep process with another that is capable of regex filtering.) http://porkmail.org/era/unix/award.html#grep – Bruno Bronosky Aug 15 '16 at 16:35
12

Does not work on macOS - there is no username after logging in – Andrei Mar 27 '18 at 13:04
14

`docker info` no longer display the username :( – Calvin Duy Canh Tran Jul 18 '19 at 10:36

score 12 · Accepted Answer · answered Nov 11 '19 at 03:30

12

Update for modern Docker.

Seems that docker info no longer contains username. I have instead learned to extract it from the credential store via jq. I haven't tried this on every credStore, but for the ones I have checked on macOS and Linux, this works.

# line breaks added for readability; this also works as a oneliner
docker-credential-$(
  jq -r .credsStore ~/.docker/config.json
) list | jq -r '
  . |
    to_entries[] |
    select(
      .key | 
      contains("docker.io")
    ) |
    last(.value)
'

[bonus] Show the entire contents of your credential helper

In this case I've settled on docker-credential-desktop, but it should work with any. You can extract your credential helper from your Docker config as I did in the previous code block.

docker-credential-desktop list | \
    jq -r 'to_entries[].key'   | \
    while read; do
        docker-credential-desktop get <<<"$REPLY";
    done

answered Nov 11 '19 at 03:30

Bruno Bronosky

66,273
12
162
149

3

Wow, I've just seen my Docker.io password in plain text – EternalLight May 23 '20 at 08:30
Hello! What do you mean by `modern Docker`? could you please specify a docker version number ? I am using docker 20.10.7 and the username is still printed with `docker info`. I would like to know if I need to prepare my scripts for future versions of docker or if we are using totally different software. Thanks! – djoproject Jun 12 '21 at 09:43
For PowerShell (Core Edition): `$credsStore = Get-Content "$env:USERPROFILE\.docker\config.json" | ConvertFrom-Json | Select-Object -ExpandProperty credsStore && $dockerUser = &"docker-credential-$credsStore.exe" list | ConvertFrom-Json -AsHashtable | Select-Object -ExpandProperty Values`. – Mavaddat Javid Jan 25 '22 at 18:54

Bruno Bronosky · Answer 3 · 2015-03-29T07:51:30.407

0

This works to extract it, but technically it's a race condition.

username="$(sed 's/.*(//;s/).*//' <(docker login & sleep 1; kill %1))"

Surely there is something better.

edited Mar 29 '15 at 07:51

answered Mar 29 '15 at 07:32

Bruno Bronosky

66,273
12
162
149

Is there a way to get the Docker Hub username of the current user?

3 Answers3

Update for modern Docker.

[bonus] Show the entire contents of your credential helper