ran go mod vendor on the whole project

vendor/github.com/mattn/go-isatty/go.mod

@@ -1,3 +0,0 @@
-module github.com/mattn/go-isatty
-
-require golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a

vendor/github.com/mattn/go-isatty/go.sum

@@ -1,2 +0,0 @@
-golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
-golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

vendor/github.com/mattn/go-isatty/isatty_appengine.go

@@ -0,0 +1,15 @@
+// +build appengine
+
+package isatty
+
+// IsTerminal returns true if the file descriptor is terminal which
+// is always false on on appengine classic which is a sandboxed PaaS.
+func IsTerminal(fd uintptr) bool {
+	return false
+}
+
+// IsCygwinTerminal() return true if the file descriptor is a cygwin or msys2
+// terminal. This is also always false on this environment.
+func IsCygwinTerminal(fd uintptr) bool {
+	return false
+}

vendor/github.com/mattn/go-isatty/isatty_bsd.go

@@ -16,9 +16,3 @@ func IsTerminal(fd uintptr) bool {
 	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
 	return err == 0
 }
-
-// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
-// terminal. This is also always false on this environment.
-func IsCygwinTerminal(fd uintptr) bool {
-	return false
-}

vendor/github.com/mattn/go-isatty/isatty_linux.go

@@ -1,4 +1,5 @@
-// +build android
+// +build linux
+// +build !appengine,!ppc64,!ppc64le
 
 package isatty
 
@@ -15,9 +16,3 @@ func IsTerminal(fd uintptr) bool {
 	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
 	return err == 0
 }
-
-// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
-// terminal. This is also always false on this environment.
-func IsCygwinTerminal(fd uintptr) bool {
-	return false
-}

vendor/github.com/mattn/go-isatty/isatty_linux_ppc64x.go

@@ -0,0 +1,19 @@
+// +build linux
+// +build ppc64 ppc64le
+
+package isatty
+
+import (
+	"unsafe"
+
+	syscall "golang.org/x/sys/unix"
+)
+
+const ioctlReadTermios = syscall.TCGETS
+
+// IsTerminal return true if the file descriptor is terminal.
+func IsTerminal(fd uintptr) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}

vendor/github.com/mattn/go-isatty/isatty_others.go

@@ -1,14 +1,9 @@
-// +build appengine js nacl
+// +build !windows
+// +build !appengine
 
 package isatty
 
-// IsTerminal returns true if the file descriptor is terminal which
-// is always false on js and appengine classic which is a sandboxed PaaS.
-func IsTerminal(fd uintptr) bool {
-	return false
-}
-
-// IsCygwinTerminal() return true if the file descriptor is a cygwin or msys2
+// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
 // terminal. This is also always false on this environment.
 func IsCygwinTerminal(fd uintptr) bool {
 	return false

vendor/github.com/mattn/go-isatty/isatty_solaris.go

@@ -14,9 +14,3 @@ func IsTerminal(fd uintptr) bool {
 	err := unix.IoctlSetTermio(int(fd), unix.TCGETA, &termio)
 	return err == nil
 }
-
-// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
-// terminal. This is also always false on this environment.
-func IsCygwinTerminal(fd uintptr) bool {
-	return false
-}

vendor/github.com/mattn/go-isatty/isatty_tcgets.go

@@ -1,19 +0,0 @@
-// +build linux aix
-// +build !appengine
-// +build !android
-
-package isatty
-
-import "golang.org/x/sys/unix"
-
-// IsTerminal return true if the file descriptor is terminal.
-func IsTerminal(fd uintptr) bool {
-	_, err := unix.IoctlGetTermios(int(fd), unix.TCGETS)
-	return err == nil
-}
-
-// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
-// terminal. This is also always false on this environment.
-func IsCygwinTerminal(fd uintptr) bool {
-	return false
-}