Document Compose's syntax for variable defaults #84
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Thanks! We should document both forms of the inline default syntax:
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code is bind mounted into the development container. Otherwise in Task 3 changes made to the source code outside the container will not be visible inside the container. This is basically the change made by @mbtamuli in #84 but that change seems to have been abandoned. Signed-off-by: Dan Liew <daniel.liew@imperial.ac.uk>
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Question: Is this for upcoming Docker Compose functionality or is this functionality already released? |
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@aanand: thanks, I missed that part. |
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In that case, please rebase this on the branch |
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This feature was not supported previously, but was added in docker/compose#3108
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Okay, I rebased over the |
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Thanks, this is looking good. I added a couple of style suggestions which I think may make this easier to understand. Please let me know what you think about these.
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| Both `$VARIABLE` and `${VARIABLE}` syntax are supported. Extended shell-style | ||
| features, such as `${VARIABLE-default}` and `${VARIABLE/foo/bar}`, are not | ||
| In the case of environment variables that are not set, it is also possible to |
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Consider "you can" instead of "it is possible to".
compose/compose-file.md
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| Both `$VARIABLE` and `${VARIABLE}` syntax are supported. Extended shell-style | ||
| features, such as `${VARIABLE-default}` and `${VARIABLE/foo/bar}`, are not | ||
| In the case of environment variables that are not set, it is also possible to | ||
| define default values like so: `${VARIABLE:-default}`. In this case, Compose |
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Consider rewriting this a bit:
...define default values using one of the following syntax variants.
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To provide a default value which will be used if
VARIABLEis unset or empty:${VARIABLE:-default} -
To provide a default value if
VARIABLEis empty:${VARIABLE-default}
Both...
Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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@mstanleyjones can you look at the updates I made here per your comments, and if this looks good, review and approve? Then either you or I can merge this...? |
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LGTM, thought I would still reconsider "it is possible to"... |
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This feature was not supported previously, but
was added in docker/compose#3108