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Windows: Allow UNC paths on build 

Signed-off-by: John Howard <jhoward@microsoft.com>
Signed-off-by: Stefan J. Wernli <swernli@microsoft.com>
This commit is contained in:
John Howard 2015-08-05 19:36:10 -07:00 committed by Stefan J. Wernli
parent 565535073f
commit df7ab6f3db
1 changed files with 26 additions and 6 deletions
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32
api/client/build.go
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@ -307,6 +307,12 @@ func (cli *DockerCli) CmdBuild(args ...string) error {
return nil
}
// isUNC returns true if the path is UNC (one starting \\). It always returns
// false on Linux.
func isUNC(path string) bool {
return runtime.GOOS == "windows" && strings.HasPrefix(path, `\\`)
}
// getDockerfileRelPath uses the given context directory for a `docker build`
// and returns the absolute path to the context directory, the relative path of
// the dockerfile in that context directory, and a non-nil error on success.
@ -317,9 +323,16 @@ func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDi
// The context dir might be a symbolic link, so follow it to the actual
// target directory.
absContextDir, err = filepath.EvalSymlinks(absContextDir)
if err != nil {
return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)
//
// FIXME. We use isUNC (always false on non-Windows platforms) to workaround
// an issue in golang. On Windows, EvalSymLinks does not work on UNC file
// paths (those starting with \\). This hack means that when using links
// on UNC paths, they will not be followed.
if !isUNC(absContextDir) {
absContextDir, err = filepath.EvalSymlinks(absContextDir)
if err != nil {
return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)
}
}
stat, err := os.Lstat(absContextDir)
@ -354,9 +367,16 @@ func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDi
}
// Evaluate symlinks in the path to the Dockerfile too.
absDockerfile, err = filepath.EvalSymlinks(absDockerfile)
if err != nil {
return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)
//
// FIXME. We use isUNC (always false on non-Windows platforms) to workaround
// an issue in golang. On Windows, EvalSymLinks does not work on UNC file
// paths (those starting with \\). This hack means that when using links
// on UNC paths, they will not be followed.
if !isUNC(absDockerfile) {
absDockerfile, err = filepath.EvalSymlinks(absDockerfile)
if err != nil {
return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)
}
}
if _, err := os.Lstat(absDockerfile); err != nil {