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We had some testers who found a hard to diagnose bug in Dockerfile

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They used single-quotes (') in the exec-form of onbuild run command
and things blew up.  They asked to fix the man page to explain why.

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
This commit is contained in:
Dan Walsh 2015-03-06 08:41:41 -05:00
parent 2a8a2d2428
commit b3769f0ca6
1 changed files with 6 additions and 0 deletions
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6
docs/man/Dockerfile.5.md
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@ -97,6 +97,9 @@ A Dockerfile is similar to a Makefile.
exec form makes it possible to avoid shell string munging. The exec form makes
it possible to **RUN** commands using a base image that does not contain `/bin/sh`.
Note that the exec form is parsed as a JSON array, which means that you must
use double-quotes (") around words not single-quotes (').
**CMD**
-- **CMD** has three forms:
@ -120,6 +123,9 @@ A Dockerfile is similar to a Makefile.
be executed when running the image.
If you use the shell form of the **CMD**, the `<command>` executes in `/bin/sh -c`:
Note that the exec form is parsed as a JSON array, which means that you must
use double-quotes (") around words not single-quotes (').
```
FROM ubuntu
CMD echo "This is a test." | wc -