Unsatisfiable constraints when installing postgresql-dev on ruby:2.4-alpine

[ChrisPatten]

Attempting to add postgresql-dev via APK in order to use this image as a base for a Rails application yields an unsatisfiable constraints error around the versions of libcrypto, libssl, and openssl (1.0.2j vs. 2.4.4). It appears that this was introduced after ruby:2.3.1-alpine as that image doesn't give the same issue.

Steps to Reproduce

Create Dockerfile with:

FROM ruby:2.4-alpine

RUN apk add --update --no-cache postgresql-dev

CMD /bin/sh

When built:

Sending build context to Docker daemon 2.048 kB
Step 1 : FROM ruby:2.4-alpine
 ---> 4962d9cd701f
Step 2 : RUN apk add --update --no-cache postgresql-dev
 ---> Running in 73cb484470a3
fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/community/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  openssl-dev-1.0.2j-r2:
    conflicts:
               libressl-dev-2.4.4-r0[pc:libcrypto=1.0.2j]
               libressl-dev-2.4.4-r0[pc:libssl=1.0.2j]
               libressl-dev-2.4.4-r0[pc:openssl=1.0.2j]
    satisfies: .ruby-rundeps-0[openssl-dev]
  libressl-dev-2.4.4-r0:
    conflicts:
               openssl-dev-1.0.2j-r2[pc:libcrypto=2.4.4]
               openssl-dev-1.0.2j-r2[pc:libssl=2.4.4]
               openssl-dev-1.0.2j-r2[pc:openssl=2.4.4]
    satisfies:
               postgresql-dev-9.6.1-r0[libressl-dev]
The command '/bin/sh -c apk add --update --no-cache postgresql-dev' returned a non-zero code: 4

[tianon]

This is a duplicate of #104, and should've been fixed by #108 (and thus docker-library/official-images#2513). Can you try docker pull ruby:2.4-alpine (or --pull on docker build) and report back?

[ChrisPatten]

Yep, that did it. I had pulled 2.4 a day before the docker-library merge happened!