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builder: Make builtin arg pruning work with > 1 arg

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The previous implementation would error out with "Unexpected EOF" which
was caused by an underlying "array index out-of-bounds" error.
The root cause was deleting items from the same array that was being
iterated over. The iteration was unaware that the array size had
changed, resulting in an error.

The new implementation builds a new array instead of mutating a copy of
the old one.

Fixes: #32744

Signed-off-by: Dave Tucker <dt@docker.com>
This commit is contained in:
Dave Tucker 2017-04-21 13:14:21 +01:00
parent e8abe0a69d
commit 1076ab58ec
2 changed files with 9 additions and 6 deletions
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9
builder/dockerfile/dispatchers.go
View file

@ -438,12 +438,11 @@ func run(req dispatchRequest) error {
// these args are transparent so resulting image should be the same regardless of the value
if len(cmdBuildEnv) > 0 {
saveCmd = config.Cmd
tmpBuildEnv := make([]string, len(cmdBuildEnv))
copy(tmpBuildEnv, cmdBuildEnv)
for i, env := range tmpBuildEnv {
var tmpBuildEnv []string
for _, env := range cmdBuildEnv {
key := strings.SplitN(env, "=", 2)[0]
if req.builder.buildArgs.IsUnreferencedBuiltin(key) {
tmpBuildEnv = append(tmpBuildEnv[:i], tmpBuildEnv[i+1:]...)
if !req.builder.buildArgs.IsUnreferencedBuiltin(key) {
tmpBuildEnv = append(tmpBuildEnv, env)
}
}
sort.Strings(tmpBuildEnv)

6
integration-cli/docker_cli_build_test.go
View file

@ -4355,7 +4355,8 @@ func (s *DockerSuite) TestBuildTimeArgHistoryExclusions(c *check.C) {
ARG %s
RUN echo "Testing Build Args!"`, envKey, explicitProxyKey)
buildImage(imgName,
cli.WithFlags("--build-arg", fmt.Sprintf("%s=%s", envKey, envVal),
cli.WithFlags("--build-arg", "https_proxy=https://proxy.example.com",
"--build-arg", fmt.Sprintf("%s=%s", envKey, envVal),
"--build-arg", fmt.Sprintf("%s=%s", explicitProxyKey, explicitProxyVal),
"--build-arg", proxy),
build.WithDockerfile(dockerfile),
@ -4365,6 +4366,9 @@ func (s *DockerSuite) TestBuildTimeArgHistoryExclusions(c *check.C) {
if strings.Contains(out, proxy) {
c.Fatalf("failed to exclude proxy settings from history!")
}
if strings.Contains(out, "https_proxy") {
c.Fatalf("failed to exclude proxy settings from history!")
}
if !strings.Contains(out, fmt.Sprintf("%s=%s", envKey, envVal)) {
c.Fatalf("explicitly defined ARG %s is not in output", explicitProxyKey)
}