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Properly detect mintty output redirection

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mintty on windows always uses pipes to connect stdout between processes
and for the terminal output. The previous implementation always assumed
that stdout connected to a pipe means that stdout is displayed on a
mintty terminal. However, this detection breaks when using pipes to
connect processes and for powershell which uses pipes when redirecting
to a file.

Now the pipe filename is queried and matched against the pattern used by
msys / cygwin when connected to the terminal. In all other cases assume
that a pipe is just a regular pipe.
This commit is contained in:
Michael Eischer 2021-03-07 23:17:11 +01:00
parent 5e6af77b7a
commit 80564a9bc9
3 changed files with 35 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
go.mod
View file

@ -37,7 +37,7 @@ require (
golang.org/x/net v0.0.0-20200904194848-62affa334b73
golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43
golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4
golang.org/x/sys v0.0.0-20210305230114-8fe3ee5dd75b
golang.org/x/text v0.3.4
google.golang.org/api v0.32.0
gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect

3
go.sum
View file

@ -379,8 +379,9 @@ golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20200828194041-157a740278f4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200905004654-be1d3432aa8f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201101102859-da207088b7d1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210305230114-8fe3ee5dd75b h1:ggRgirZABFolTmi3sn6Ivd9SipZwLedQ5wR0aAKnFxU=
golang.org/x/sys v0.0.0-20210305230114-8fe3ee5dd75b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20201117132131-f5c789dd3221 h1:/ZHdbVpdR/jk3g30/d4yUL0JU9kksj8+F/bnQUVLGDM=
golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

33
internal/ui/termstatus/terminal_windows.go
View file

@ -4,6 +4,7 @@ package termstatus
import (
"io"
"strings"
"syscall"
"unsafe"
@ -80,6 +81,22 @@ func isPipe(fd uintptr) bool {
return err == nil && typ == windows.FILE_TYPE_PIPE
}
func getFileNameByHandle(fd uintptr) (string, error) {
type FILE_NAME_INFO struct {
FileNameLength int32
FileName [windows.MAX_LONG_PATH]uint16
}
var fi FILE_NAME_INFO
err := windows.GetFileInformationByHandleEx(windows.Handle(fd), windows.FileNameInfo, (*byte)(unsafe.Pointer(&fi)), uint32(unsafe.Sizeof(fi)))
if err != nil {
return "", err
}
filename := syscall.UTF16ToString(fi.FileName[:])
return filename, nil
}
// CanUpdateStatus returns true if status lines can be printed, the process
// output is not redirected to a file or pipe.
func CanUpdateStatus(fd uintptr) bool {
@ -88,11 +105,23 @@ func CanUpdateStatus(fd uintptr) bool {
return true
}
// check that the output file type is a pipe (0x0003)
// pipes require special handling
if !isPipe(fd) {
return false
}
// assume we're running in mintty/cygwin
fn, err := getFileNameByHandle(fd)
if err != nil {
return false
}
// inspired by https://github.com/RyanGlScott/mintty/blob/master/src/System/Console/MinTTY/Win32.hsc
// terminal: \msys-dd50a72ab4668b33-pty0-to-master
// pipe to cat: \msys-dd50a72ab4668b33-13244-pipe-0x16
if (strings.HasPrefix(fn, "\\cygwin-") || strings.HasPrefix(fn, "\\msys-")) &&
strings.Contains(fn, "-pty") && strings.HasSuffix(fn, "-master") {
return true
}
return false
}