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From: Allen Hewes <allen@decisiv.com>
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Subject: RE: CygwinPaltform Identification
Thread-Topic: CygwinPaltform Identification
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Date: Wed, 9 Feb 2022 06:07:02 +0000
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> -----Original Message-----
> From: Cygwin <cygwin-bounces+allen=decisiv.net@cygwin.com> On Behalf
> Of julie77793@gmail.com
> Sent: Tuesday, February 8, 2022 11:13 PM
> To: cygwin@cygwin.com
> Subject: RE: CygwinPaltform Identification
>
> I realize that I can create my own env variables. I just think that Cygwin
> should provide them so that programmers writing software can rely on the
> variable name and value. If there is no consistent value when Cygwin is
> installed then dozens of tools that work on other bash solutions for Windows
> can't be made to work on Cygwin.
>

It does. How much more consistent can you get with what Brian pointed out? OSTYPE would be safe in BASH 4+. And if you wanted to be pedantic, OS and OSTYPE and some regex of MACHTYPE? MSYSTEM isn't portable. Of course, there's always uname.

Cygwin:
$ printf "BASH=%s\nOS=%s\nOSTYPE=%s\nHOSTTYPE=%s\nMACHTYPE=%s\n" "${BASH_VERSION}" "${OS-Unknown}" "${OSTYPE}" "${HOSTTYPE}" "${MACHTYPE}"
BASH=4.4.23(1)-release
OS=Windows_NT
OSTYPE=cygwin
HOSTTYPE=x86_64
MACHTYPE=x86_64-unknown-cygwin

MSYS2:
$ printf "BASH=%s\nOS=%s\nOSTYPE=%s\nHOSTTYPE=%s\nMACHTYPE=%s\n" "${BASH_VERSION}" "${OS-Unknown}" "${OSTYPE}" "${HOSTTYPE}" "${MACHTYPE}"
BASH=5.1.8(1)-release
OS=Windows_NT
OSTYPE=msys
HOSTTYPE=x86_64
MACHTYPE=x86_64-pc-msys

Fedora:
$ printf "BASH=%s\nOS=%s\nOSTYPE=%s\nHOSTTYPE=%s\nMACHTYPE=%s\n" "${BASH_VERSION}" "${OS-Unknown}" "${OSTYPE}" "${HOSTTYPE}" "${MACHTYPE}"
BASH=5.1.0(1)-release
OS=Unknown
OSTYPE=linux-gnu
HOSTTYPE=x86_64
MACHTYPE=x86_64-redhat-linux-gnu

FreeBSD:
$ printf "BASH=%s\nOS=%s\nOSTYPE=%s\nHOSTTYPE=%s\nMACHTYPE=%s\n" "${BASH_VERSION}" "${OS-Unknown}" "${OSTYPE}" "${HOSTTYPE}" "${MACHTYPE}"
BASH=5.1.16(0)-release
OS=Unknown
OSTYPE=freebsd12.2
HOSTTYPE=amd64
MACHTYPE=amd64-portbld-freebsd12.2

And Cygwin Python knows of it's host:
$ python
Python 3.8.12 (default, Sep 10 2021, 16:06:59)
[GCC 11.2.0] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.name
'posix'
>>> import platform
>>> platform.system()
'CYGWIN_NT-10.0-19044'
>>> platform.release()
'3.3.4-341.x86_64'
>>> quit()

/allen

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