diff --git a/packages/envd/internal/services/process/handler/handler.go b/packages/envd/internal/services/process/handler/handler.go index 4dcc7b1fa8..68f881fa54 100644 --- a/packages/envd/internal/services/process/handler/handler.go +++ b/packages/envd/internal/services/process/handler/handler.go @@ -227,6 +227,7 @@ func New( Groups: groups, }, } + configureProcessGroup(cmd.SysProcAttr, req.GetPty() != nil) applyCgroupFD(cmd.SysProcAttr, cgroupFD, ok) resolvedPath, err := permissions.ExpandAndResolve(req.GetProcess().GetCwd(), user, defaults.Workdir) @@ -462,25 +463,50 @@ func getProcType(req *rpc.StartRequest) cgroups.ProcessType { return cgroups.ProcessTypeUser } -func (p *Handler) SendSignal(signal syscall.Signal) error { - if signal == syscall.SIGKILL || signal == syscall.SIGTERM { - p.outCancel() +func configureProcessGroup(attr *syscall.SysProcAttr, hasPTY bool) { + // PTY startup creates a new session (and therefore a new process group). + // Non-PTY commands need an explicit process group so callers can opt into + // signalling the command and its descendants without affecting envd. + if !hasPTY { + attr.Setpgid = true } +} - // Re-adopted handler (post live-upgrade): no cmd, signal by stored pid. - if p.cmd == nil { - if p.pid == 0 { - return errors.New("process not started") +func (p *Handler) SendSignal(signal syscall.Signal, descendants bool) error { + pid := int(p.Pid()) + if pid == 0 { + return errors.New("process not started") + } + + var err error + switch { + case descendants: + pgid, groupErr := syscall.Getpgid(pid) + if groupErr != nil { + return fmt.Errorf("get process group for pid %d: %w", pid, groupErr) + } + if pgid != pid { + return fmt.Errorf("process %d does not own a process group", pid) } - return syscall.Kill(int(p.pid), signal) + err = syscall.Kill(-pgid, signal) + case p.cmd == nil: + // Re-adopted handler (post live-upgrade): no cmd, signal by stored pid. + err = syscall.Kill(pid, signal) + default: + err = p.cmd.Process.Signal(signal) + } + if err != nil { + return err } - if p.cmd.Process == nil { - return errors.New("process not started") + // Keep delivering output when signal validation or delivery fails. Once a terminal signal has + // actually been sent, stop the pumps promptly instead of waiting for every inherited pipe to close. + if signal == syscall.SIGKILL || signal == syscall.SIGTERM { + p.outCancel() } - return p.cmd.Process.Signal(signal) + return nil } func (p *Handler) ResizeTty(size *pty.Winsize) error { diff --git a/packages/envd/internal/services/process/handler/handler_test.go b/packages/envd/internal/services/process/handler/handler_test.go index d11fc49bf1..69863f923f 100644 --- a/packages/envd/internal/services/process/handler/handler_test.go +++ b/packages/envd/internal/services/process/handler/handler_test.go @@ -2,9 +2,16 @@ package handler import ( "errors" + "fmt" + "os" + "os/exec" + "path/filepath" + "syscall" "testing" + "time" "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" ) // The process wrapper must degrade cleanly when the priority helpers are absent @@ -50,3 +57,87 @@ func TestWrapperPrefix(t *testing.T) { assert.Equal(t, "/bin/ionice -c 1 -n 6 ", ioniceNicePrefix(1, 6, 0, only("ionice"))) }) } + +func TestSendSignalTargetsOnlyLeaderByDefault(t *testing.T) { + t.Parallel() + + cmd := startCommandGroup(t) + + h := &Handler{cmd: cmd, outCancel: func() {}} + t.Cleanup(func() { + _ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL) + _, _ = cmd.Process.Wait() + }) + + require.NoError(t, h.SendSignal(syscall.SIGTERM, false)) + state, err := cmd.Process.Wait() + require.NoError(t, err) + assert.False(t, state.Success()) + require.NoError(t, syscall.Kill(-cmd.Process.Pid, syscall.Signal(0)), "child should remain in the group") +} + +func TestSendSignalTargetsProcessGroupWhenDescendantsRequested(t *testing.T) { + t.Parallel() + + cmd := startCommandGroup(t) + + h := &Handler{cmd: cmd, outCancel: func() {}} + t.Cleanup(func() { + _ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL) + _, _ = cmd.Process.Wait() + }) + + require.NoError(t, h.SendSignal(syscall.SIGTERM, true)) + state, err := cmd.Process.Wait() + require.NoError(t, err) + assert.False(t, state.Success()) + require.Eventually(t, func() bool { + return syscall.Kill(-cmd.Process.Pid, syscall.Signal(0)) != nil + }, 2*time.Second, 10*time.Millisecond) +} + +func TestSendSignalRejectsDescendantsWithoutOwnedProcessGroup(t *testing.T) { + t.Parallel() + + cmd := exec.CommandContext(t.Context(), "sleep", "60") + require.NoError(t, cmd.Start()) + t.Cleanup(func() { + _ = cmd.Process.Kill() + _, _ = cmd.Process.Wait() + }) + + outputCancelled := false + h := &Handler{cmd: cmd, outCancel: func() { outputCancelled = true }} + err := h.SendSignal(syscall.SIGKILL, true) + require.ErrorContains(t, err, "does not own a process group") + require.NoError(t, cmd.Process.Signal(syscall.Signal(0)), "leader should remain alive") + assert.False(t, outputCancelled, "a rejected signal must keep the live process output connected") +} + +func TestConfigureProcessGroup(t *testing.T) { + t.Parallel() + + nonPTY := &syscall.SysProcAttr{} + configureProcessGroup(nonPTY, false) + assert.True(t, nonPTY.Setpgid) + + pty := &syscall.SysProcAttr{} + configureProcessGroup(pty, true) + assert.False(t, pty.Setpgid, "PTY startup creates its own session") +} + +func startCommandGroup(t *testing.T) *exec.Cmd { + t.Helper() + + childReady := filepath.Join(t.TempDir(), "child.pid") + cmd := exec.CommandContext(t.Context(), "sh", "-c", fmt.Sprintf("sleep 60 & echo $! > %q; exec sleep 60", childReady)) + cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true} + require.NoError(t, cmd.Start()) + require.Eventually(t, func() bool { + _, err := os.Stat(childReady) + + return err == nil + }, 2*time.Second, 10*time.Millisecond) + + return cmd +} diff --git a/packages/envd/internal/services/process/handler/readopt.go b/packages/envd/internal/services/process/handler/readopt.go index 30adb30ce9..8ef8e49b2e 100644 --- a/packages/envd/internal/services/process/handler/readopt.go +++ b/packages/envd/internal/services/process/handler/readopt.go @@ -151,7 +151,7 @@ func (p *Handler) BeginReaping() { select { case <-t.C: - _ = p.SendSignal(syscall.SIGKILL) + _ = p.SendSignal(syscall.SIGKILL, false) case <-p.outCtx.Done(): } }() diff --git a/packages/envd/internal/services/process/signal.go b/packages/envd/internal/services/process/signal.go index cbeb138395..8418448ac3 100644 --- a/packages/envd/internal/services/process/signal.go +++ b/packages/envd/internal/services/process/signal.go @@ -29,7 +29,7 @@ func (s *Service) SendSignal( return nil, connect.NewError(connect.CodeUnimplemented, fmt.Errorf("invalid signal: %s", req.Msg.GetSignal())) } - err = handler.SendSignal(signal) + err = handler.SendSignal(signal, req.Msg.GetDescendants()) if err != nil { return nil, connect.NewError(connect.CodeInternal, fmt.Errorf("error sending signal: %w", err)) } diff --git a/packages/envd/internal/services/spec/process/process.pb.go b/packages/envd/internal/services/spec/process/process.pb.go index bdfc62a0aa..1499f02cc2 100644 --- a/packages/envd/internal/services/spec/process/process.pb.go +++ b/packages/envd/internal/services/spec/process/process.pb.go @@ -507,6 +507,7 @@ type ProcessEvent struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Event: + // // *ProcessEvent_Start // *ProcessEvent_Data // *ProcessEvent_End @@ -802,6 +803,7 @@ type ProcessInput struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Input: + // // *ProcessInput_Stdin // *ProcessInput_Pty Input isProcessInput_Input `protobuf_oneof:"input"` @@ -882,6 +884,7 @@ type StreamInputRequest struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Event: + // // *StreamInputRequest_Start // *StreamInputRequest_Data // *StreamInputRequest_Keepalive @@ -1015,6 +1018,9 @@ type SendSignalRequest struct { Process *ProcessSelector `protobuf:"bytes,1,opt,name=process,proto3" json:"process,omitempty"` Signal Signal `protobuf:"varint,2,opt,name=signal,proto3,enum=process.Signal" json:"signal,omitempty"` + // Signal the command's process group instead of only its leader. + // This includes descendants that remain in the command's process group. + Descendants bool `protobuf:"varint,3,opt,name=descendants,proto3" json:"descendants,omitempty"` } func (x *SendSignalRequest) Reset() { @@ -1063,6 +1069,13 @@ func (x *SendSignalRequest) GetSignal() Signal { return Signal_SIGNAL_UNSPECIFIED } +func (x *SendSignalRequest) GetDescendants() bool { + if x != nil { + return x.Descendants + } + return false +} + type SendSignalResponse struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -1239,6 +1252,7 @@ type ProcessSelector struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Selector: + // // *ProcessSelector_Pid // *ProcessSelector_Tag Selector isProcessSelector_Selector `protobuf_oneof:"selector"` @@ -1421,6 +1435,7 @@ type ProcessEvent_DataEvent struct { unknownFields protoimpl.UnknownFields // Types that are assignable to 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-const Version = "0.8.0" // x-release-please-version +const Version = "0.8.1" // x-release-please-version diff --git a/packages/envd/spec/process/process.proto b/packages/envd/spec/process/process.proto index 99376a0e37..d9029d0d44 100644 --- a/packages/envd/spec/process/process.proto +++ b/packages/envd/spec/process/process.proto @@ -149,6 +149,10 @@ message SendSignalRequest { ProcessSelector process = 1; Signal signal = 2; + + // Signal the command's process group instead of only its leader. + // This includes descendants that remain in the command's process group. + bool descendants = 3; } message SendSignalResponse {} diff --git a/packages/shared/pkg/grpc/envd/process/process.pb.go b/packages/shared/pkg/grpc/envd/process/process.pb.go index bfc4a603dc..79540d387d 100644 --- a/packages/shared/pkg/grpc/envd/process/process.pb.go +++ b/packages/shared/pkg/grpc/envd/process/process.pb.go @@ -507,6 +507,7 @@ type ProcessEvent struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Event: + // // *ProcessEvent_Start // *ProcessEvent_Data // *ProcessEvent_End @@ -802,6 +803,7 @@ type ProcessInput struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Input: + // // *ProcessInput_Stdin // *ProcessInput_Pty Input isProcessInput_Input `protobuf_oneof:"input"` @@ -882,6 +884,7 @@ type StreamInputRequest struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Event: + // // *StreamInputRequest_Start // *StreamInputRequest_Data // *StreamInputRequest_Keepalive @@ -1015,6 +1018,9 @@ type SendSignalRequest struct { Process *ProcessSelector `protobuf:"bytes,1,opt,name=process,proto3" json:"process,omitempty"` Signal Signal `protobuf:"varint,2,opt,name=signal,proto3,enum=process.Signal" json:"signal,omitempty"` + // Signal the command's process group instead of only its leader. + // This includes descendants that remain in the command's process group. + Descendants bool `protobuf:"varint,3,opt,name=descendants,proto3" json:"descendants,omitempty"` } func (x *SendSignalRequest) Reset() { @@ -1063,6 +1069,13 @@ func (x *SendSignalRequest) GetSignal() Signal { return Signal_SIGNAL_UNSPECIFIED } +func (x *SendSignalRequest) GetDescendants() bool { + if x != nil { + return x.Descendants + } + return false +} + type SendSignalResponse struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -1239,6 +1252,7 @@ type ProcessSelector struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Selector: + // // *ProcessSelector_Pid // *ProcessSelector_Tag Selector isProcessSelector_Selector `protobuf_oneof:"selector"` @@ -1421,6 +1435,7 @@ type ProcessEvent_DataEvent struct { unknownFields protoimpl.UnknownFields // Types that are assignable to Output: + // // *ProcessEvent_DataEvent_Stdout // *ProcessEvent_DataEvent_Stderr // *ProcessEvent_DataEvent_Pty @@ -1882,78 +1897,81 @@ var file_process_process_proto_rawDesc = []byte{ 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