How does .dockerignore handle exceptions?
For example, I would like to ignore everything from the src/ directory except for src/web/public.
I've tried...
.git
src
!src/web/public
Seems to not work.
docker build . shows Sending build context to Docker daemon 20.63 MB either way.
It does not appear that .dockerignore handles exceptions. If there is a well-known syntax for this, you could propose the change and make a pull request.
In tag 1.3 of commands.go we see this:
ignore, err := ioutil.ReadFile(path.Join(root, ".dockerignore"))
// ...
options := &archive.TarOptions{
Compression: archive.Uncompressed,
Excludes: excludes,
}
context, err = archive.TarWithOptions(root, options)
and in archive.go:
for _, include := range options.Includes {
// ...
skip, err := fileutils.Matches(relFilePath, options.Excludes)
if err != nil {
log.Debugf("Error matching %s", relFilePath, err)
return err
}
if skip {
if f.IsDir() {
return filepath.SkipDir
}
return nil
}
// ...
}
Just wanted to add in case others run into this question, that
from docker 1.7.0 exclusions are supported in the .dockerignore file. So the example !src/web/public in the question actually works
https://docs.docker.com/engine/reference/builder/#dockerignore-file
Using my response to another question https://stackoverflow.com/a/51429852/2419069 you can use the following .dockerignore file:
# Ignore everything
**
# Allow /src/web/public directory
!/src/web/public/**
# You can also ignore unnecessary files inside the /src/web/public to make your image even smaller.
**/*~
**/*.log
**/.DS_Store
**/Thumbs.db
