add pkg/signal

Add pkg/signal to deal with parts of signal processing and translating
signals from string to numeric representations.  The code has been
copied from docker/docker (and attributed with the copyright) but been
reduced to only what libpod needs (on Linux).

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

19 files changed, 90 insertions, 399 deletions

diff --git a/go.mod b/go.mod
index 076a22808..f9a8e4b49 100644
--- a/go.mod
+++ b/go.mod
@@ -77,6 +77,7 @@ require (
 	google.golang.org/appengine v1.6.1 // indirect
 	google.golang.org/genproto v0.0.0-20190620144150-6af8c5fc6601 // indirect
 	gopkg.in/yaml.v2 v2.2.8
+	gotest.tools/v3 v3.0.2 // indirect
 	k8s.io/api v0.17.3
 	k8s.io/apimachinery v0.17.3
 	k8s.io/client-go v0.0.0-20190620085101-78d2af792bab
diff --git a/go.sum b/go.sum
index 860b80a3d..748fc3242 100644
--- a/go.sum
+++ b/go.sum
@@ -574,6 +574,7 @@ golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190606124116-d0a3d012864b/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190614205625-5aca471b1d59/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
+golang.org/x/tools v0.0.0-20190624222133-a101b041ded4/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -618,6 +619,8 @@ gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gotest.tools v0.0.0-20190624233834-05ebafbffc79/go.mod h1:R//lfYlUuTOTfblYI3lGoAAAebUdzjvbmQsuB7Ykd90=
 gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+gotest.tools/v3 v3.0.2 h1:kG1BFyqVHuQoVQiR1bWGnfz/fmHvvuiSPIV7rvl360E=
+gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 k8s.io/api v0.0.0-20190620084959-7cf5895f2711/go.mod h1:TBhBqb1AWbBQbW3XRusr7n7E4v2+5ZY8r8sAMnyFC5A=
diff --git a/pkg/adapter/sigproxy_linux.go b/pkg/adapter/sigproxy_linux.go
index 35745a6aa..8295e4250 100644
--- a/pkg/adapter/sigproxy_linux.go
+++ b/pkg/adapter/sigproxy_linux.go
@@ -5,7 +5,7 @@ import (
 	"syscall"
 
 	"github.com/containers/libpod/libpod"
-	"github.com/docker/docker/pkg/signal"
+	"github.com/containers/libpod/pkg/signal"
 	"github.com/sirupsen/logrus"
 )
 
@@ -20,7 +20,7 @@ func ProxySignals(ctr *libpod.Container) {
 		for s := range sigBuffer {
 			// Ignore SIGCHLD and SIGPIPE - these are mostly likely
 			// intended for the podman command itself.
-			if s == signal.SIGCHLD || s == signal.SIGPIPE {
+			if s == syscall.SIGCHLD || s == syscall.SIGPIPE {
 				continue
 			}
 
diff --git a/pkg/adapter/terminal.go b/pkg/adapter/terminal.go
index 51b747d23..499e77def 100644
--- a/pkg/adapter/terminal.go
+++ b/pkg/adapter/terminal.go
@@ -3,9 +3,9 @@ package adapter
 import (
 	"context"
 	"os"
-	gosignal "os/signal"
+	"os/signal"
 
-	"github.com/docker/docker/pkg/signal"
+	lsignal "github.com/containers/libpod/pkg/signal"
 	"github.com/docker/docker/pkg/term"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -33,7 +33,7 @@ func getResize() *remotecommand.TerminalSize {
 // Helper for prepareAttach - set up a goroutine to generate terminal resize events
 func resizeTty(ctx context.Context, resize chan remotecommand.TerminalSize) {
 	sigchan := make(chan os.Signal, 1)
-	gosignal.Notify(sigchan, signal.SIGWINCH)
+	signal.Notify(sigchan, lsignal.SIGWINCH)
 	go func() {
 		defer close(resize)
 		// Update the terminal size immediately without waiting
diff --git a/pkg/api/handlers/containers_create.go b/pkg/api/handlers/containers_create.go
index 4781b23bc..48f0de94d 100644
--- a/pkg/api/handlers/containers_create.go
+++ b/pkg/api/handlers/containers_create.go
@@ -12,9 +12,9 @@ import (
 	image2 "github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/api/handlers/utils"
 	"github.com/containers/libpod/pkg/namespaces"
+	"github.com/containers/libpod/pkg/signal"
 	createconfig "github.com/containers/libpod/pkg/spec"
 	"github.com/containers/storage"
-	"github.com/docker/docker/pkg/signal"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_linux.go b/pkg/signal/signal_linux.go
index 4013bded1..3d549898f 100644
--- a/vendor/github.com/docker/docker/pkg/signal/signal_linux.go
+++ b/pkg/signal/signal_linux.go
@@ -1,8 +1,18 @@
-// +build !mips,!mipsle,!mips64,!mips64le
+// +build linux
 
-package signal // import "github.com/docker/docker/pkg/signal"
+// Signal handling for Linux only.
+package signal
+
+// Copyright 2013-2018 Docker, Inc.
+
+// NOTE: this package has originally been copied from github.com/docker/docker.
 
 import (
+	"fmt"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
 	"syscall"
 
 	"golang.org/x/sys/unix"
@@ -11,10 +21,12 @@ import (
 const (
 	sigrtmin = 34
 	sigrtmax = 64
+
+	SIGWINCH = syscall.SIGWINCH // For cross-compilation with Windows
 )
 
-// SignalMap is a map of Linux signals.
-var SignalMap = map[string]syscall.Signal{
+// signalMap is a map of Linux signals.
+var signalMap = map[string]syscall.Signal{
 	"ABRT":     unix.SIGABRT,
 	"ALRM":     unix.SIGALRM,
 	"BUS":      unix.SIGBUS,
@@ -81,3 +93,35 @@ var SignalMap = map[string]syscall.Signal{
 	"RTMAX-1":  sigrtmax - 1,
 	"RTMAX":    sigrtmax,
 }
+
+// ParseSignal translates a string to a valid syscall signal.
+// It returns an error if the signal map doesn't include the given signal.
+func ParseSignal(rawSignal string) (syscall.Signal, error) {
+	s, err := strconv.Atoi(rawSignal)
+	if err == nil {
+		if s == 0 {
+			return -1, fmt.Errorf("invalid signal: %s", rawSignal)
+		}
+		return syscall.Signal(s), nil
+	}
+	signal, ok := signalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
+	if !ok {
+		return -1, fmt.Errorf("invalid signal: %s", rawSignal)
+	}
+	return signal, nil
+}
+
+// CatchAll catches all signals and relays them to the specified channel.
+func CatchAll(sigc chan os.Signal) {
+	var handledSigs []os.Signal
+	for _, s := range signalMap {
+		handledSigs = append(handledSigs, s)
+	}
+	signal.Notify(sigc, handledSigs...)
+}
+
+// StopCatch stops catching the signals and closes the specified channel.
+func StopCatch(sigc chan os.Signal) {
+	signal.Stop(sigc)
+	close(sigc)
+}
diff --git a/pkg/signal/signal_unsupported.go b/pkg/signal/signal_unsupported.go
new file mode 100644
index 000000000..0a92a5b3a
--- /dev/null
+++ b/pkg/signal/signal_unsupported.go
@@ -0,0 +1,28 @@
+// +build !linux
+
+// Signal handling for Linux only.
+package signal
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+)
+
+const SIGWINCH = syscall.Signal(0xff)
+
+// ParseSignal translates a string to a valid syscall signal.
+// It returns an error if the signal map doesn't include the given signal.
+func ParseSignal(rawSignal string) (syscall.Signal, error) {
+	return 0, fmt.Errorf("unsupported on non-linux platforms")
+}
+
+// CatchAll catches all signals and relays them to the specified channel.
+func CatchAll(sigc chan os.Signal) {
+	panic("Unsupported on non-linux platforms")
+}
+
+// StopCatch stops catching the signals and closes the specified channel.
+func StopCatch(sigc chan os.Signal) {
+	panic("Unsupported on non-linux platforms")
+}
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 6aa3c221e..4a52ea68d 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -18,9 +18,9 @@ import (
 	"github.com/containers/libpod/pkg/errorhandling"
 	"github.com/containers/libpod/pkg/namespaces"
 	"github.com/containers/libpod/pkg/rootless"
+	"github.com/containers/libpod/pkg/signal"
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/idtools"
-	"github.com/docker/docker/pkg/signal"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
diff --git a/test/system/130-kill.bats b/test/system/130-kill.bats
index aae7f114f..5e098d754 100644
--- a/test/system/130-kill.bats
+++ b/test/system/130-kill.bats
@@ -70,10 +70,10 @@ load helpers
     for s in ${bad_signal_names[@]}; do
         # 'nosuchcontainer' is fine: podman should bail before it gets there
         run_podman 125 kill -s $s nosuchcontainer
-        is "$output" "Error: Invalid signal: $s" "Error from kill -s $s"
+        is "$output" "Error: invalid signal: $s" "Error from kill -s $s"
 
         run_podman 125 pod kill -s $s nosuchpod
-        is "$output" "Error: Invalid signal: $s" "Error from pod kill -s $s"
+        is "$output" "Error: invalid signal: $s" "Error from pod kill -s $s"
     done
 
     # Special case: these too are thrown by docker/signal.ParseSignal(),
@@ -82,7 +82,7 @@ load helpers
     local -a bad_dash_signals=(-0 -SIGBADSIG -SIG -BADSIG -)
     for s in ${bad_dash_signals[@]}; do
         run_podman 125 kill -s $s nosuchcontainer
-        is "$output" "Error: Invalid signal: ${s##-}" "Error from kill -s $s"
+        is "$output" "Error: invalid signal: ${s##-}" "Error from kill -s $s"
     done
 
     # This error (signal out of range) is thrown by our wrapper
diff --git a/vendor/github.com/docker/docker/pkg/signal/README.md b/vendor/github.com/docker/docker/pkg/signal/README.md
deleted file mode 100644
index 2b237a594..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/README.md
+++ /dev/null
@@ -1 +0,0 @@
-This package provides helper functions for dealing with signals across various operating systems
\ No newline at end of file
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal.go b/vendor/github.com/docker/docker/pkg/signal/signal.go
deleted file mode 100644
index 88ef7b5ea..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal.go
+++ /dev/null
@@ -1,54 +0,0 @@
-// Package signal provides helper functions for dealing with signals across
-// various operating systems.
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"fmt"
-	"os"
-	"os/signal"
-	"strconv"
-	"strings"
-	"syscall"
-)
-
-// CatchAll catches all signals and relays them to the specified channel.
-func CatchAll(sigc chan os.Signal) {
-	var handledSigs []os.Signal
-	for _, s := range SignalMap {
-		handledSigs = append(handledSigs, s)
-	}
-	signal.Notify(sigc, handledSigs...)
-}
-
-// StopCatch stops catching the signals and closes the specified channel.
-func StopCatch(sigc chan os.Signal) {
-	signal.Stop(sigc)
-	close(sigc)
-}
-
-// ParseSignal translates a string to a valid syscall signal.
-// It returns an error if the signal map doesn't include the given signal.
-func ParseSignal(rawSignal string) (syscall.Signal, error) {
-	s, err := strconv.Atoi(rawSignal)
-	if err == nil {
-		if s == 0 {
-			return -1, fmt.Errorf("Invalid signal: %s", rawSignal)
-		}
-		return syscall.Signal(s), nil
-	}
-	signal, ok := SignalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
-	if !ok {
-		return -1, fmt.Errorf("Invalid signal: %s", rawSignal)
-	}
-	return signal, nil
-}
-
-// ValidSignalForPlatform returns true if a signal is valid on the platform
-func ValidSignalForPlatform(sig syscall.Signal) bool {
-	for _, v := range SignalMap {
-		if v == sig {
-			return true
-		}
-	}
-	return false
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_darwin.go b/vendor/github.com/docker/docker/pkg/signal/signal_darwin.go
deleted file mode 100644
index ee5501e3d..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_darwin.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// SignalMap is a map of Darwin signals.
-var SignalMap = map[string]syscall.Signal{
-	"ABRT":   syscall.SIGABRT,
-	"ALRM":   syscall.SIGALRM,
-	"BUG":    syscall.SIGBUS,
-	"CHLD":   syscall.SIGCHLD,
-	"CONT":   syscall.SIGCONT,
-	"EMT":    syscall.SIGEMT,
-	"FPE":    syscall.SIGFPE,
-	"HUP":    syscall.SIGHUP,
-	"ILL":    syscall.SIGILL,
-	"INFO":   syscall.SIGINFO,
-	"INT":    syscall.SIGINT,
-	"IO":     syscall.SIGIO,
-	"IOT":    syscall.SIGIOT,
-	"KILL":   syscall.SIGKILL,
-	"PIPE":   syscall.SIGPIPE,
-	"PROF":   syscall.SIGPROF,
-	"QUIT":   syscall.SIGQUIT,
-	"SEGV":   syscall.SIGSEGV,
-	"STOP":   syscall.SIGSTOP,
-	"SYS":    syscall.SIGSYS,
-	"TERM":   syscall.SIGTERM,
-	"TRAP":   syscall.SIGTRAP,
-	"TSTP":   syscall.SIGTSTP,
-	"TTIN":   syscall.SIGTTIN,
-	"TTOU":   syscall.SIGTTOU,
-	"URG":    syscall.SIGURG,
-	"USR1":   syscall.SIGUSR1,
-	"USR2":   syscall.SIGUSR2,
-	"VTALRM": syscall.SIGVTALRM,
-	"WINCH":  syscall.SIGWINCH,
-	"XCPU":   syscall.SIGXCPU,
-	"XFSZ":   syscall.SIGXFSZ,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go b/vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go
deleted file mode 100644
index 764f90e26..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_freebsd.go
+++ /dev/null
@@ -1,43 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// SignalMap is a map of FreeBSD signals.
-var SignalMap = map[string]syscall.Signal{
-	"ABRT":   syscall.SIGABRT,
-	"ALRM":   syscall.SIGALRM,
-	"BUF":    syscall.SIGBUS,
-	"CHLD":   syscall.SIGCHLD,
-	"CONT":   syscall.SIGCONT,
-	"EMT":    syscall.SIGEMT,
-	"FPE":    syscall.SIGFPE,
-	"HUP":    syscall.SIGHUP,
-	"ILL":    syscall.SIGILL,
-	"INFO":   syscall.SIGINFO,
-	"INT":    syscall.SIGINT,
-	"IO":     syscall.SIGIO,
-	"IOT":    syscall.SIGIOT,
-	"KILL":   syscall.SIGKILL,
-	"LWP":    syscall.SIGLWP,
-	"PIPE":   syscall.SIGPIPE,
-	"PROF":   syscall.SIGPROF,
-	"QUIT":   syscall.SIGQUIT,
-	"SEGV":   syscall.SIGSEGV,
-	"STOP":   syscall.SIGSTOP,
-	"SYS":    syscall.SIGSYS,
-	"TERM":   syscall.SIGTERM,
-	"THR":    syscall.SIGTHR,
-	"TRAP":   syscall.SIGTRAP,
-	"TSTP":   syscall.SIGTSTP,
-	"TTIN":   syscall.SIGTTIN,
-	"TTOU":   syscall.SIGTTOU,
-	"URG":    syscall.SIGURG,
-	"USR1":   syscall.SIGUSR1,
-	"USR2":   syscall.SIGUSR2,
-	"VTALRM": syscall.SIGVTALRM,
-	"WINCH":  syscall.SIGWINCH,
-	"XCPU":   syscall.SIGXCPU,
-	"XFSZ":   syscall.SIGXFSZ,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go b/vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go
deleted file mode 100644
index 4c7989121..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_linux_mipsx.go
+++ /dev/null
@@ -1,84 +0,0 @@
-// +build linux
-// +build mips mipsle mips64 mips64le
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-const (
-	sigrtmin = 34
-	sigrtmax = 127
-)
-
-// SignalMap is a map of Linux signals.
-var SignalMap = map[string]syscall.Signal{
-	"ABRT":     unix.SIGABRT,
-	"ALRM":     unix.SIGALRM,
-	"BUS":      unix.SIGBUS,
-	"CHLD":     unix.SIGCHLD,
-	"CLD":      unix.SIGCLD,
-	"CONT":     unix.SIGCONT,
-	"FPE":      unix.SIGFPE,
-	"HUP":      unix.SIGHUP,
-	"ILL":      unix.SIGILL,
-	"INT":      unix.SIGINT,
-	"IO":       unix.SIGIO,
-	"IOT":      unix.SIGIOT,
-	"KILL":     unix.SIGKILL,
-	"PIPE":     unix.SIGPIPE,
-	"POLL":     unix.SIGPOLL,
-	"PROF":     unix.SIGPROF,
-	"PWR":      unix.SIGPWR,
-	"QUIT":     unix.SIGQUIT,
-	"SEGV":     unix.SIGSEGV,
-	"SIGEMT":   unix.SIGEMT,
-	"STOP":     unix.SIGSTOP,
-	"SYS":      unix.SIGSYS,
-	"TERM":     unix.SIGTERM,
-	"TRAP":     unix.SIGTRAP,
-	"TSTP":     unix.SIGTSTP,
-	"TTIN":     unix.SIGTTIN,
-	"TTOU":     unix.SIGTTOU,
-	"URG":      unix.SIGURG,
-	"USR1":     unix.SIGUSR1,
-	"USR2":     unix.SIGUSR2,
-	"VTALRM":   unix.SIGVTALRM,
-	"WINCH":    unix.SIGWINCH,
-	"XCPU":     unix.SIGXCPU,
-	"XFSZ":     unix.SIGXFSZ,
-	"RTMIN":    sigrtmin,
-	"RTMIN+1":  sigrtmin + 1,
-	"RTMIN+2":  sigrtmin + 2,
-	"RTMIN+3":  sigrtmin + 3,
-	"RTMIN+4":  sigrtmin + 4,
-	"RTMIN+5":  sigrtmin + 5,
-	"RTMIN+6":  sigrtmin + 6,
-	"RTMIN+7":  sigrtmin + 7,
-	"RTMIN+8":  sigrtmin + 8,
-	"RTMIN+9":  sigrtmin + 9,
-	"RTMIN+10": sigrtmin + 10,
-	"RTMIN+11": sigrtmin + 11,
-	"RTMIN+12": sigrtmin + 12,
-	"RTMIN+13": sigrtmin + 13,
-	"RTMIN+14": sigrtmin + 14,
-	"RTMIN+15": sigrtmin + 15,
-	"RTMAX-14": sigrtmax - 14,
-	"RTMAX-13": sigrtmax - 13,
-	"RTMAX-12": sigrtmax - 12,
-	"RTMAX-11": sigrtmax - 11,
-	"RTMAX-10": sigrtmax - 10,
-	"RTMAX-9":  sigrtmax - 9,
-	"RTMAX-8":  sigrtmax - 8,
-	"RTMAX-7":  sigrtmax - 7,
-	"RTMAX-6":  sigrtmax - 6,
-	"RTMAX-5":  sigrtmax - 5,
-	"RTMAX-4":  sigrtmax - 4,
-	"RTMAX-3":  sigrtmax - 3,
-	"RTMAX-2":  sigrtmax - 2,
-	"RTMAX-1":  sigrtmax - 1,
-	"RTMAX":    sigrtmax,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_unix.go b/vendor/github.com/docker/docker/pkg/signal/signal_unix.go
deleted file mode 100644
index a2aa4248f..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_unix.go
+++ /dev/null
@@ -1,21 +0,0 @@
-// +build !windows
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// Signals used in cli/command (no windows equivalent, use
-// invalid signals so they don't get handled)
-
-const (
-	// SIGCHLD is a signal sent to a process when a child process terminates, is interrupted, or resumes after being interrupted.
-	SIGCHLD = syscall.SIGCHLD
-	// SIGWINCH is a signal sent to a process when its controlling terminal changes its size
-	SIGWINCH = syscall.SIGWINCH
-	// SIGPIPE is a signal sent to a process when a pipe is written to before the other end is open for reading
-	SIGPIPE = syscall.SIGPIPE
-	// DefaultStopSignal is the syscall signal used to stop a container in unix systems.
-	DefaultStopSignal = "SIGTERM"
-)
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go b/vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go
deleted file mode 100644
index 1fd25a83c..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_unsupported.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// +build !linux,!darwin,!freebsd,!windows
-
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// SignalMap is an empty map of signals for unsupported platform.
-var SignalMap = map[string]syscall.Signal{}
diff --git a/vendor/github.com/docker/docker/pkg/signal/signal_windows.go b/vendor/github.com/docker/docker/pkg/signal/signal_windows.go
deleted file mode 100644
index 65752f24a..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/signal_windows.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"syscall"
-)
-
-// Signals used in cli/command (no windows equivalent, use
-// invalid signals so they don't get handled)
-const (
-	SIGCHLD  = syscall.Signal(0xff)
-	SIGWINCH = syscall.Signal(0xff)
-	SIGPIPE  = syscall.Signal(0xff)
-	// DefaultStopSignal is the syscall signal used to stop a container in windows systems.
-	DefaultStopSignal = "15"
-)
-
-// SignalMap is a map of "supported" signals. As per the comment in GOLang's
-// ztypes_windows.go: "More invented values for signals". Windows doesn't
-// really support signals in any way, shape or form that Unix does.
-//
-// We have these so that docker kill can be used to gracefully (TERM) and
-// forcibly (KILL) terminate a container on Windows.
-var SignalMap = map[string]syscall.Signal{
-	"KILL": syscall.SIGKILL,
-	"TERM": syscall.SIGTERM,
-}
diff --git a/vendor/github.com/docker/docker/pkg/signal/trap.go b/vendor/github.com/docker/docker/pkg/signal/trap.go
deleted file mode 100644
index a277b9562..000000000
--- a/vendor/github.com/docker/docker/pkg/signal/trap.go
+++ /dev/null
@@ -1,104 +0,0 @@
-package signal // import "github.com/docker/docker/pkg/signal"
-
-import (
-	"fmt"
-	"os"
-	gosignal "os/signal"
-	"path/filepath"
-	"runtime"
-	"strings"
-	"sync/atomic"
-	"syscall"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-// Trap sets up a simplified signal "trap", appropriate for common
-// behavior expected from a vanilla unix command-line tool in general
-// (and the Docker engine in particular).
-//
-// * If SIGINT or SIGTERM are received, `cleanup` is called, then the process is terminated.
-// * If SIGINT or SIGTERM are received 3 times before cleanup is complete, then cleanup is
-//   skipped and the process is terminated immediately (allows force quit of stuck daemon)
-// * A SIGQUIT always causes an exit without cleanup, with a goroutine dump preceding exit.
-// * Ignore SIGPIPE events. These are generated by systemd when journald is restarted while
-//   the docker daemon is not restarted and also running under systemd.
-//   Fixes https://github.com/docker/docker/issues/19728
-//
-func Trap(cleanup func(), logger interface {
-	Info(args ...interface{})
-}) {
-	c := make(chan os.Signal, 1)
-	// we will handle INT, TERM, QUIT, SIGPIPE here
-	signals := []os.Signal{os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT, syscall.SIGPIPE}
-	gosignal.Notify(c, signals...)
-	go func() {
-		interruptCount := uint32(0)
-		for sig := range c {
-			if sig == syscall.SIGPIPE {
-				continue
-			}
-
-			go func(sig os.Signal) {
-				logger.Info(fmt.Sprintf("Processing signal '%v'", sig))
-				switch sig {
-				case os.Interrupt, syscall.SIGTERM:
-					if atomic.LoadUint32(&interruptCount) < 3 {
-						// Initiate the cleanup only once
-						if atomic.AddUint32(&interruptCount, 1) == 1 {
-							// Call the provided cleanup handler
-							cleanup()
-							os.Exit(0)
-						} else {
-							return
-						}
-					} else {
-						// 3 SIGTERM/INT signals received; force exit without cleanup
-						logger.Info("Forcing docker daemon shutdown without cleanup; 3 interrupts received")
-					}
-				case syscall.SIGQUIT:
-					DumpStacks("")
-					logger.Info("Forcing docker daemon shutdown without cleanup on SIGQUIT")
-				}
-				// for the SIGINT/TERM, and SIGQUIT non-clean shutdown case, exit with 128 + signal #
-				os.Exit(128 + int(sig.(syscall.Signal)))
-			}(sig)
-		}
-	}()
-}
-
-const stacksLogNameTemplate = "goroutine-stacks-%s.log"
-
-// DumpStacks appends the runtime stack into file in dir and returns full path
-// to that file.
-func DumpStacks(dir string) (string, error) {
-	var (
-		buf       []byte
-		stackSize int
-	)
-	bufferLen := 16384
-	for stackSize == len(buf) {
-		buf = make([]byte, bufferLen)
-		stackSize = runtime.Stack(buf, true)
-		bufferLen *= 2
-	}
-	buf = buf[:stackSize]
-	var f *os.File
-	if dir != "" {
-		path := filepath.Join(dir, fmt.Sprintf(stacksLogNameTemplate, strings.Replace(time.Now().Format(time.RFC3339), ":", "", -1)))
-		var err error
-		f, err = os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0666)
-		if err != nil {
-			return "", errors.Wrap(err, "failed to open file to write the goroutine stacks")
-		}
-		defer f.Close()
-		defer f.Sync()
-	} else {
-		f = os.Stderr
-	}
-	if _, err := f.Write(buf); err != nil {
-		return "", errors.Wrap(err, "failed to write goroutine stacks")
-	}
-	return f.Name(), nil
-}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 3c03fbdfb..69f2bed8e 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -238,7 +238,6 @@ github.com/docker/docker/pkg/mount
 github.com/docker/docker/pkg/namesgenerator
 github.com/docker/docker/pkg/parsers
 github.com/docker/docker/pkg/pools
-github.com/docker/docker/pkg/signal
 github.com/docker/docker/pkg/stdcopy
 github.com/docker/docker/pkg/system
 github.com/docker/docker/pkg/term