winpty: error: cannot start 'mvn': Not found in PATH

[mihab]

A bit silly, but does anyone know what is going on here:

miha@DESKTOP-CEC4TIT MINGW64 ~
$ mvn --version
Apache Maven 3.5.2 (138edd61fd100ec658bfa2d307c43b76940a5d7d; 2017-10-18T09:58:13+02:00)
Maven home: C:\Users\miha\Dev\maven\3.5.2
Java version: 1.8.0_161, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.8.0_161\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"

miha@DESKTOP-CEC4TIT MINGW64 ~
$ winpty mvn --version
winpty: error: cannot start 'mvn': Not found in PATH

miha@DESKTOP-CEC4TIT MINGW64 ~
$ winpty which mvn
/c/Users/miha/Dev/maven/3.5.2/bin/mvn

Quite obviously mvn is on the path, works with Command Prompt and Git Bash (but cannot be interrupted), but when used via winpty it's apparently not on the path? Does winpty use a different path variable or something?

[k-takata]

How about executing with the .cmd extension?
$ winpty mvn.cmd

[mihab]

Yes it does work, thanks! Can someone explain why mvn.cmd works but mvn and mvn.exe don't?

[wulph111]

Under cygwin, the same behavior occurs with node.js components npm and npx.
Also node packages such as serialport with standalone commands:

$ which serialport-list
/cygdrive/c/Users/admin/AppData/Roaming/npm/serialport-list

$ ls /cygdrive/c/Users/admin/AppData/Roaming/npm
create-react-app      ng            nodemon       node-red-pi.cmd          serialport-list      serialport-term.cmd
create-react-app.cmd  ng.cmd        nodemon.cmd   npm-windows-upgrade      serialport-list.cmd  yo
electron              node_modules  node-red      npm-windows-upgrade.cmd  serialport-repl      yo.cmd
electron.cmd          node-gyp      node-red.cmd  reddit-oauth-helper      serialport-repl.cmd  yo-complete
etc                   node-gyp.cmd  node-red-pi   reddit-oauth-helper.cmd  serialport-term      yo-complete.cmd

$ serialport-list
COM1    ACPI\PNP0501\1  (Standard port types)

$ winpty serialport-list
winpty: error: cannot start 'serialport-list': Not found in PATH
code 1

$ winpty serialport-list.cmd
COM1    ACPI\PNP0501\1  (Standard port types)

@mihab Yes it does work, thanks! Can someone explain why mvn.cmd works but mvn and mvn.exe don't?

There's probably no mvn.exe in your PATH directories, and winpty explicitly appends .exe to the program name when searching:

                if (endsWith(candidate, ".bat") || endsWith(candidate, ".cmd")) {
#ifdef __MSYS__
                    // In MSYS/MSYS2, batch files don't have the execute bit
                    // set, so just check that they're readable.
                    perm = R_OK;
#endif
                } else if (endsWith(candidate, ".com") || endsWith(candidate, ".exe")) {
                    // Do nothing.
                } else {
                    // Make the exe extension explicit so that we don't try to
                    // run shell scripts with CreateProcess/winpty_spawn.
                    candidate += ".exe";
                }

[mihab]

I see, thanks for the explanation. It's still kinda weird behaviour and perhaps not so intuitive, what do you think should be done about this ticket @wulph111 ? Close as a non-bug?

[wulph111]

I'd leave it open for @rprichard to decide.. it's confusing behavior but maybe necessary. I don't know enough to say if it can be "fixed" -- I'm only here because I had the same problem :)

[ModeEngage]

Shouldn't winpty respect the PATH_EXT environment variable?

PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY

[sakshiahuja]

What's this? After managing aliases permission denied got resolved but now this ?
winpty : Not found in PATH ?