While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /usr/lib/ruby/gems/3.1.0 directory

[toyaser]

I am building my own custom docker image and below is my Dockerfile

FROM fluent/fluentd:v1.15-1

# Use root account to use apk
USER root

RUN apk add --no-cache --update --virtual .build-deps \
        sudo build-base ruby-dev \
 && sudo gem install fluent-plugin-elasticsearch \
 && sudo gem sources --clear-all \
 && apk del .build-deps \
 && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem
.
.
.

When running the Dockerfile, I get the following:

(11/26) Installing mpc1 (1.2.1-r0)
(12/26) Installing gcc (11.2.1_git20220219-r2)

(13/26) Installing musl-dev (1.2.3-r0)
(14/26) Installing libc-dev (0.7.2-r3)
(15/26) Installing g++ (11.2.1_git20220219-r2)

(16/26) Installing make (4.3-r0)
(17/26) Installing fortify-headers (1.1-r1)
(18/26) Installing patch (2.7.6-r7)
(19/26) Installing build-base (0.5-r3)
(20/26) Installing ruby-rdoc (3.1.2-r0)
(21/26) Installing libgmpxx (6.2.1-r2)
(22/26) Installing pkgconf (1.8.0-r0)
(23/26) Installing gmp-dev (6.2.1-r2)
(24/26) Installing libucontext-dev (1.2-r0)
(25/26) Installing ruby-dev (3.1.2-r0)
(26/26) Installing .build-deps (20220718.183134)
Executing busybox-1.35.0-r13.trigger
OK: 212 MiB in 52 packages

�[91mERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /usr/lib/ruby/gems/3.1.0 directory.
�[0mThe command '/bin/sh -c apk add --no-cache --update --virtual .build-deps         sudo build-base ruby-dev  && sudo gem install fluent-plugin-elasticsearch  && sudo gem sources --clear-all  && apk del .build-deps  && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem' returned a non-zero code: 1

This only happens with version 1.15-1 of fluentd, same Dockerfile works perfectly fine for v1.14.6-1.1

[ashie]

Hmm, I can't reproduce it:

Dockerfile:

FROM fluent/fluentd:v1.15-1

# Use root account to use apk
USER root

RUN apk add --no-cache --update --virtual .build-deps \
        sudo build-base ruby-dev \
 && sudo gem install fluent-plugin-elasticsearch \
 && sudo gem sources --clear-all \
 && apk del .build-deps \
 && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem

Build:

docker build .
Sending build context to Docker daemon   2.56kB
Step 1/3 : FROM fluent/fluentd:v1.15-1
v1.15-1: Pulling from fluent/fluentd
2408cc74d12b: Already exists 
aa69f3b9770f: Pull complete 
702d0c034626: Pull complete 
0522d98f4673: Pull complete 
ebd920cb2e58: Pull complete 
Digest: sha256:5fdefb7258d63548fe27644994b4326e403a998d2763ab47fc4f45d92d620876
Status: Downloaded newer image for fluent/fluentd:v1.15-1
 ---> f3e86d9680ea
Step 2/3 : USER root
 ---> Running in e52e761a1a28
Removing intermediate container e52e761a1a28
 ---> 8a91994c1715
Step 3/3 : RUN apk add --no-cache --update --virtual .build-deps         sudo build-base ruby-dev  && sudo gem install fluent-plugin-elasticsearch  && sudo gem sources --clear-all  && apk del .build-deps  && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem
 ---> Running in 414cc684f690
fetch https://dl-cdn.alpinelinux.org/alpine/v3.16/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.16/community/x86_64/APKINDEX.tar.gz
(1/26) Installing sudo (1.9.10-r0)
(2/26) Installing libgcc (11.2.1_git20220219-r2)
(3/26) Installing libstdc++ (11.2.1_git20220219-r2)
(4/26) Installing binutils (2.38-r3)
(5/26) Installing libmagic (5.41-r0)
(6/26) Installing file (5.41-r0)
(7/26) Installing libgomp (11.2.1_git20220219-r2)
(8/26) Installing libatomic (11.2.1_git20220219-r2)
(9/26) Installing isl22 (0.22-r0)
(10/26) Installing mpfr4 (4.1.0-r0)
(11/26) Installing mpc1 (1.2.1-r0)
(12/26) Installing gcc (11.2.1_git20220219-r2)
(13/26) Installing musl-dev (1.2.3-r0)
(14/26) Installing libc-dev (0.7.2-r3)
(15/26) Installing g++ (11.2.1_git20220219-r2)
(16/26) Installing make (4.3-r0)
(17/26) Installing fortify-headers (1.1-r1)
(18/26) Installing patch (2.7.6-r7)
(19/26) Installing build-base (0.5-r3)
(20/26) Installing ruby-rdoc (3.1.2-r0)
(21/26) Installing libgmpxx (6.2.1-r2)
(22/26) Installing pkgconf (1.8.0-r0)
(23/26) Installing gmp-dev (6.2.1-r2)
(24/26) Installing libucontext-dev (1.2-r0)
(25/26) Installing ruby-dev (3.1.2-r0)
(26/26) Installing .build-deps (20220720.093020)
Executing busybox-1.35.0-r13.trigger
OK: 212 MiB in 52 packages
Successfully installed excon-0.92.3
Successfully installed multi_json-1.15.0
Successfully installed faraday-retry-1.0.3
Successfully installed faraday-rack-1.0.0
Successfully installed faraday-patron-1.0.0
Successfully installed faraday-net_http_persistent-1.2.0
Successfully installed faraday-net_http-1.0.1
Successfully installed multipart-post-2.2.3
Successfully installed faraday-multipart-1.0.4
Successfully installed faraday-httpclient-1.0.1
Successfully installed faraday-excon-1.1.0
Successfully installed faraday-em_synchrony-1.0.0
Successfully installed faraday-em_http-1.0.0
Successfully installed faraday-1.10.0
Successfully installed elastic-transport-8.0.1
Successfully installed elasticsearch-api-8.3.0
Successfully installed elasticsearch-8.3.0
Successfully installed fluent-plugin-elasticsearch-5.2.3
18 gems installed
*** Removed specs cache ***
(1/26) Purging .build-deps (20220720.093020)
(2/26) Purging sudo (1.9.10-r0)
(3/26) Purging build-base (0.5-r3)
(4/26) Purging file (5.41-r0)
(5/26) Purging g++ (11.2.1_git20220219-r2)
(6/26) Purging gcc (11.2.1_git20220219-r2)
(7/26) Purging binutils (2.38-r3)
(8/26) Purging libatomic (11.2.1_git20220219-r2)
(9/26) Purging libgomp (11.2.1_git20220219-r2)
(10/26) Purging make (4.3-r0)
(11/26) Purging libc-dev (0.7.2-r3)
(12/26) Purging musl-dev (1.2.3-r0)
(13/26) Purging fortify-headers (1.1-r1)
(14/26) Purging patch (2.7.6-r7)
(15/26) Purging ruby-dev (3.1.2-r0)
(16/26) Purging ruby-rdoc (3.1.2-r0)
(17/26) Purging gmp-dev (6.2.1-r2)
(18/26) Purging libgmpxx (6.2.1-r2)
(19/26) Purging libucontext-dev (1.2-r0)
(20/26) Purging libstdc++ (11.2.1_git20220219-r2)
(21/26) Purging libgcc (11.2.1_git20220219-r2)
(22/26) Purging libmagic (5.41-r0)
(23/26) Purging isl22 (0.22-r0)
(24/26) Purging mpc1 (1.2.1-r0)
(25/26) Purging mpfr4 (4.1.0-r0)
(26/26) Purging pkgconf (1.8.0-r0)
Executing busybox-1.35.0-r13.trigger
OK: 23 MiB in 26 packages
Removing intermediate container 414cc684f690
 ---> e63e32002c44
Successfully built e63e32002c44

[toyaser]

@ashie as always thank you for your quick response, and I am sorry I didnt do my full testing. You are correct, after a little bit more research I found this docker-library/ruby#351 I was running docker version 19.03.6, build 369ce74a3c and once i upgraded to 20.10.7, build f0df350 it worked. Just wanted to put it here in case anyone runs into the same issue