sbox: run commands using script for large commands
Linux has limit of 32 pages for a single argument. Sbox's method of
handling commands as a single large string can run into this limitation.
Write the large command to a script file and then execute that file.
This better accommodates the large commands, and leaves a script in the
temporary directory useful for manual inspection if necessary.
Bug: 177070955
Bug: 174232579
Fixes: 202297224
Test: m
Test: make particular target with very long command exceeding limit.
Change-Id: Ia298fdfd7a759821c37f540deaf800026041e511
diff --git a/cmd/sbox/sbox.go b/cmd/sbox/sbox.go
index c7f3f6a..4fa7486 100644
--- a/cmd/sbox/sbox.go
+++ b/cmd/sbox/sbox.go
@@ -164,7 +164,7 @@
if useSubDir {
localTempDir = filepath.Join(localTempDir, strconv.Itoa(i))
}
- depFile, err := runCommand(command, localTempDir)
+ depFile, err := runCommand(command, localTempDir, i)
if err != nil {
// Running the command failed, keep the temporary output directory around in
// case a user wants to inspect it for debugging purposes. Soong will delete
@@ -194,6 +194,28 @@
return nil
}
+// createCommandScript will create and return an exec.Cmd that runs rawCommand.
+//
+// rawCommand is executed via a script in the sandbox.
+// tempDir is the temporary where the script is created.
+// toDirInSandBox is the path containing the script in the sbox environment.
+// toDirInSandBox is the path containing the script in the sbox environment.
+// seed is a unique integer used to distinguish different scripts that might be at location.
+//
+// returns an exec.Cmd that can be ran from within sbox context if no error, or nil if error.
+// caller must ensure script is cleaned up if function succeeds.
+//
+func createCommandScript(rawCommand string, tempDir, toDirInSandbox string, seed int) (*exec.Cmd, error) {
+ scriptName := fmt.Sprintf("sbox_command.%d.bash", seed)
+ scriptPathAndName := joinPath(tempDir, scriptName)
+ err := os.WriteFile(scriptPathAndName, []byte(rawCommand), 0644)
+ if err != nil {
+ return nil, fmt.Errorf("failed to write command %s... to %s",
+ rawCommand[0:40], scriptPathAndName)
+ }
+ return exec.Command("bash", joinPath(toDirInSandbox, filepath.Base(scriptName))), nil
+}
+
// readManifest reads an sbox manifest from a textproto file.
func readManifest(file string) (*sbox_proto.Manifest, error) {
manifestData, err := ioutil.ReadFile(file)
@@ -213,7 +235,7 @@
// runCommand runs a single command from a manifest. If the command references the
// __SBOX_DEPFILE__ placeholder it returns the name of the depfile that was used.
-func runCommand(command *sbox_proto.Command, tempDir string) (depFile string, err error) {
+func runCommand(command *sbox_proto.Command, tempDir string, commandIndex int) (depFile string, err error) {
rawCommand := command.GetCommand()
if rawCommand == "" {
return "", fmt.Errorf("command is required")
@@ -255,7 +277,11 @@
return "", err
}
- cmd := exec.Command("bash", "-c", rawCommand)
+ cmd, err := createCommandScript(rawCommand, tempDir, pathToTempDirInSbox, commandIndex)
+ if err != nil {
+ return "", err
+ }
+
buf := &bytes.Buffer{}
cmd.Stdin = os.Stdin
cmd.Stdout = buf