Deion I'm not sure how to categorise this but it seems like

Docker build is not recognising the `-e` flag for the echo command about cli HOT 2 OPEN

kalpaitch commented on June 20, 2024

Docker build is not recognising the `-e` flag for the echo command

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Comments (2)

athulnair02 commented on June 20, 2024

Hi, I would like to work on this, is there a good place to start?

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thaJeztah commented on June 20, 2024

I'm not able to reproduce this issue using alpine as base-image;

docker build -t foo -<<'EOF'
FROM alpine
RUN echo -e "BEGINNING OF FILE\n\n" > .tmpfile
EOF

Build runs successfully;

[+] Building 1.5s (7/7) FINISHED                                                                                                                                                                           docker:desktop-linux
 => [internal] load build definition from Dockerfile                                                                                                                                                                       0.0s
 => => transferring dockerfile: 96B                                                                                                                                                                                        0.0s
 => [internal] load metadata for docker.io/library/alpine:latest                                                                                                                                                           0.0s
 => [internal] load .dockerignore                                                                                                                                                                                          0.0s
 => => transferring context: 2B                                                                                                                                                                                            0.0s
 => [1/2] FROM docker.io/library/alpine:latest@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b                                                                                                     1.2s
 => => resolve docker.io/library/alpine:latest@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b                                                                                                     1.2s
 => [auth] library/alpine:pull token for registry-1.docker.io                                                                                                                                                              0.0s
 => [2/2] RUN echo -e "BEGINNING OF FILE\n\n" > .tmpfile                                                                                                                                                                   0.1s
 => exporting to image                                                                                                                                                                                                     0.1s
 => => exporting layers                                                                                                                                                                                                    0.0s
 => => exporting manifest sha256:07e9b08ca1e01a821c0779ed887a2ad47622da64c8bd558c757ada84bfdb97ab                                                                                                                          0.0s
 => => exporting config sha256:e8769b3ba4c8f5e05d3c2b38644985cc74fb123b221a79fd99635b7663815811                                                                                                                            0.0s
 => => exporting attestation manifest sha256:c93bcc769d1be9eca9549c10fe9828a49f922e8abc2c7423cbf6a5ff719b8c99                                                                                                              0.0s
 => => exporting manifest list sha256:97cab80709c4b973b084d9066f472d9dd242a395646bc6f9dfcfc0099b4f0fd3                                                                                                                     0.0s
 => => naming to docker.io/library/foo:latest                                                                                                                                                                              0.0s
 => => unpacking to docker.io/library/foo:latest                                                                                                                                                                           0.0s

And checking the file shows the expected content;

docker run --rm foo cat /.tmpfile
BEGINNING OF FILE

However, the RUN command itself is executed in a container, so it depends on what base-image you're using; my example used alpine, but perhaps it doesn't work with other images; what image are you using as base-image?

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