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Send SIGQUIT when cancelling an execution

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When the context passed to Nomad Allocation Exec is cancelled, the
process is not terminated. Instead, just the WebSocket connection is
closed. In order to terminate long-running processes, a special
character is injected into the standard input stream. This character is
parsed by the tty line discipline (tty has to be true). The line
discipline sends a SIGQUIT signal to the process, terminating it and
producing a core dump (in a file called 'core'). The SIGQUIT signal can
be caught but isn't by default, which is why the runner is destroyed if
the program does not terminate during a grace period after the signal
was sent.
This commit is contained in:
Konrad Hanff
2021-07-21 09:12:44 +02:00
parent 91537a7364
commit 8d24bda61a
10 changed files with 237 additions and 63 deletions
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22
internal/runner/runner_mock.go
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@@ -23,12 +23,26 @@ func (_m *RunnerMock) Add(id ExecutionID, executionRequest *dto.ExecutionRequest
_m.Called(id, executionRequest)
}
// Destroy provides a mock function with given fields:
func (_m *RunnerMock) Destroy() error {
ret := _m.Called()
var r0 error
if rf, ok := ret.Get(0).(func() error); ok {
r0 = rf()
} else {
r0 = ret.Error(0)
}
return r0
}
// ExecuteInteractively provides a mock function with given fields: request, stdin, stdout, stderr
func (_m *RunnerMock) ExecuteInteractively(request *dto.ExecutionRequest, stdin io.Reader, stdout io.Writer, stderr io.Writer) (<-chan ExitInfo, context.CancelFunc) {
func (_m *RunnerMock) ExecuteInteractively(request *dto.ExecutionRequest, stdin io.ReadWriter, stdout io.Writer, stderr io.Writer) (<-chan ExitInfo, context.CancelFunc) {
ret := _m.Called(request, stdin, stdout, stderr)
var r0 <-chan ExitInfo
if rf, ok := ret.Get(0).(func(*dto.ExecutionRequest, io.Reader, io.Writer, io.Writer) <-chan ExitInfo); ok {
if rf, ok := ret.Get(0).(func(*dto.ExecutionRequest, io.ReadWriter, io.Writer, io.Writer) <-chan ExitInfo); ok {
r0 = rf(request, stdin, stdout, stderr)
} else {
if ret.Get(0) != nil {
@@ -37,7 +51,7 @@ func (_m *RunnerMock) ExecuteInteractively(request *dto.ExecutionRequest, stdin
}
var r1 context.CancelFunc
if rf, ok := ret.Get(1).(func(*dto.ExecutionRequest, io.Reader, io.Writer, io.Writer) context.CancelFunc); ok {
if rf, ok := ret.Get(1).(func(*dto.ExecutionRequest, io.ReadWriter, io.Writer, io.Writer) context.CancelFunc); ok {
r1 = rf(request, stdin, stdout, stderr)
} else {
if ret.Get(1) != nil {
@@ -48,7 +62,7 @@ func (_m *RunnerMock) ExecuteInteractively(request *dto.ExecutionRequest, stdin
return r0, r1
}
// Id provides a mock function with given fields:
// ID provides a mock function with given fields:
func (_m *RunnerMock) ID() string {
ret := _m.Called()