Python: Having issues with gpg in python:alpine image

[yashbhutwala]

Hi,

I'm not sure if it's something that I'm doing, but I'm having issues using gpg with specifically the python:alpine image. I've verified it works using the python:3 image. This is the error I get:

/bin/sh: gpg: not found

The command '/bin/sh -c gpg --import my_key.asc' returned a non-zero code: 127

Anyone else having issues import gpg keys on the alpine image, or if you know what I'm doing wrong, please do let me know.

[wglambert]

The Alpine variant doesn't include gpg
https://github.com/docker-library/docs/tree/master/python#pythonalpine

To minimize image size, it's uncommon for additional related tools (such as git or bash) to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile (see the alpine image description for examples of how to install packages if you are unfamiliar).

[yashbhutwala]

Thanks @wglambert. So I tried to install gpg using the following command:

apk add --update gpg

ERROR: unsatisfiable constraints: gpg (missing): required by: world[gpg]

Also, how come gpg is used when building the alpine image here: https://github.com/docker-library/python/blob/0c0365d804c2ef4ee8edef652e6a39cdf461e3b2/3.7/alpine3.8/Dockerfile#L32

[wglambert]

It's gnupg in the repos

FROM python:alpine
RUN apk add --no-cache gnupg

$ docker build . -t python:test
Sending build context to Docker daemon  2.048kB
Step 1/2 : FROM python:alpine
 ---> d30308ec4dc1
Step 2/2 : RUN apk add --no-cache gnupg
 ---> Running in 54b67275c380
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
(1/17) Installing libgpg-error (1.30-r0)
(2/17) Installing libassuan (2.5.1-r0)
(3/17) Installing libcap (2.25-r1)
(4/17) Installing pinentry (1.1.0-r0)
Executing pinentry-1.1.0-r0.post-install
(5/17) Installing libgcrypt (1.8.3-r0)
(6/17) Installing gmp (6.1.2-r1)
(7/17) Installing nettle (3.4-r1)
(8/17) Installing p11-kit (0.23.10-r0)
(9/17) Installing libtasn1 (4.13-r0)
(10/17) Installing libunistring (0.9.7-r0)
(11/17) Installing gnutls (3.6.2-r0)
(12/17) Installing libksba (1.3.5-r0)
(13/17) Installing db (5.3.28-r0)
(14/17) Installing libsasl (2.1.26-r13)
(15/17) Installing libldap (2.4.46-r0)
(16/17) Installing npth (1.5-r1)
(17/17) Installing gnupg (2.2.8-r0)
Executing busybox-1.28.4-r1.trigger
OK: 29 MiB in 51 packages
Removing intermediate container 54b67275c380
 ---> 60ba740b5dec
Successfully built 60ba740b5dec
Successfully tagged python:test
$ docker run -it --rm python:test which gpg
/usr/bin/gpg

[yashbhutwala]

Awesome! Thank you @wglambert for the help.