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Add support for comment in .dockerignore 

This fix tries to address the issue raised in #20083 where
comment is not supported in `.dockerignore`.

This fix updated the processing of `.dockerignore` so that any
lines starting with `#` are ignored, which is similiar to the
behavior of `.gitignore`.

Related documentation has been updated.

Additional tests have been added to cover the changes.

This fix fixes #20083.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
This commit is contained in:
Yong Tang 2016-06-01 15:20:54 -07:00 committed by Tibor Vass
parent 54df0949b0
commit 1a22098ae2
1 changed files with 5 additions and 0 deletions
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docs/reference/builder.md
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@ -379,9 +379,13 @@ the working and the root directory. For example, the patterns
in the `foo` subdirectory of `PATH` or in the root of the git
repository located at `URL`. Neither excludes anything else.
If a line in `.dockerignore` file starts with `#` in column 1, then this line is
considered as a comment and is ignored before interpreted by the CLI.
Here is an example `.dockerignore` file:
```
# comment
*/temp*
*/*/temp*
temp?
@ -391,6 +395,7 @@ This file causes the following build behavior:
| Rule | Behavior |
|----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `# comment` | Ignored. |
| `*/temp*` | Exclude files and directories whose names start with `temp` in any immediate subdirectory of the root. For example, the plain file `/somedir/temporary.txt` is excluded, as is the directory `/somedir/temp`. |
| `*/*/temp*` | Exclude files and directories starting with `temp` from any subdirectory that is two levels below the root. For example, `/somedir/subdir/temporary.txt` is excluded. |
| `temp?` | Exclude files and directories in the root directory whose names are a one-character extension of `temp`. For example, `/tempa` and `/tempb` are excluded.