Bug 1725895: Add support for MSYS2 MozillaBuild r=glandium

MSYS2 has a slightly different directory structure (binaries are
now under "/usr/bin/" instead of "/bin/"), and we're now plonking
it in `%MOZILLABUILD%\msys2` instead of `%MOZILLABUILD%\msys` so that
MSYS1 files don't interfere with MSYS2 after a pave-over install.

Speaking of pave-over installs: if both `msys2` and `msys` are available,
this patch prefers `msys2`. This is because MozillaBuild installations
with MSYS2 are going to _assume_ they're using MSYS2, and therefore
be most compatible with the versions of packages shipped with MSYS2.

Differential Revision: https://phabricator.services.mozilla.com/D133549

build/moz.configure/init.configure

@@ -104,11 +104,15 @@ option(env="CONFIG_SHELL", nargs=1, help="Path to a POSIX shell")
 @depends("CONFIG_SHELL", "MOZILLABUILD")
 @checking("for a shell")
 @imports("sys")
+@imports(_from="pathlib", _import="Path")
 def shell(value, mozillabuild):
     if value:
         return find_program(value[0])
     shell = "sh"
     if mozillabuild:
+        if (Path(mozillabuild[0]) / "msys2").exists():
+            shell = mozillabuild[0] + "/msys2/usr/bin/sh"
+        else:
             shell = mozillabuild[0] + "/msys/bin/sh"
     if sys.platform == "win32":
         shell = shell + ".exe"

build/upload.py

@@ -35,8 +35,8 @@ def FixupMsysPath(path):
     trying to pass an absolute path on a remote server. This function attempts
     to un-mangle such paths."""
     if "OSTYPE" in os.environ and os.environ["OSTYPE"] == "msys":
-        # sort of awful, find out where our shell is (should be in msys/bin)
+        # sort of awful, find out where our shell is (should be in msys2/usr/bin
-        # and strip the first part of that path out of the other path
+        # or msys/bin) and strip the first part of that path out of the other path
         if "SHELL" in os.environ:
             sh = os.environ["SHELL"]
             msys = sh[: sh.find("/bin")]

python/mach/mach/mixin/process.py

@@ -11,6 +11,7 @@ import os
 import signal
 import subprocess
 import sys
+from pathlib import Path
 
 from typing import Optional
 from mozprocess.processhandler import ProcessHandlerMixin
@@ -24,7 +25,11 @@ from .logging import LoggingMixin
 if "SHELL" in os.environ:
     _current_shell = os.environ["SHELL"]
 elif "MOZILLABUILD" in os.environ:
-    _current_shell = os.environ["MOZILLABUILD"] + "/msys/bin/sh.exe"
+    mozillabuild = os.environ["MOZILLABUILD"]
+    if (Path(mozillabuild) / "msys2").exists():
+        _current_shell = mozillabuild + "/msys2/usr/bin/sh.exe"
+    else:
+        _current_shell = mozillabuild + "/msys/bin/sh.exe"
 elif "COMSPEC" in os.environ:
     _current_shell = os.environ["COMSPEC"]
 elif sys.platform != "win32":

python/mozbuild/mozbuild/backend/visualstudio.py

@@ -12,6 +12,7 @@ import os
 import re
 import sys
 import uuid
+from pathlib import Path
 
 from xml.dom import getDOMImplementation
 
@@ -466,11 +467,16 @@ class VisualStudioBackend(CommonBackend):
         fh.write(b"$expanded = $bashargs -join ' '\r\n")
         fh.write(b'$procargs = "-c", $expanded\r\n')
 
+        if (Path(os.environ["MOZILLABUILD"]) / "msys2").exists():
+            bash_path = rb"msys2\usr\bin\bash"
+        else:
+            bash_path = rb"msys\bin\bash"
+
         fh.write(
             b"Start-Process -WorkingDirectory $env:TOPOBJDIR "
-            b"-FilePath $env:MOZILLABUILD\\msys\\bin\\bash "
+            b"-FilePath $env:MOZILLABUILD\\%b "
             b"-ArgumentList $procargs "
-            b"-Wait -NoNewWindow\r\n"
+            b"-Wait -NoNewWindow\r\n" % bash_path
         )
 
     def _write_mach_batch(self, fh):
@@ -492,12 +498,17 @@ class VisualStudioBackend(CommonBackend):
             self.environment.topsrcdir, self.environment.topobjdir
         ).replace("\\", "/")
 
+        if (Path(os.environ["MOZILLABUILD"]) / "msys2").exists():
+            bash_path = rb"msys2\usr\bin\bash"
+        else:
+            bash_path = rb"msys\bin\bash"
+
         # We go through mach because it has the logic for choosing the most
         # appropriate build tool.
         fh.write(
-            b'"%%MOZILLABUILD%%\\msys\\bin\\bash" '
+            b'"%%MOZILLABUILD%%\\%b" '
             b'-c "%s/mach --log-no-times %%1 %%2 %%3 %%4 %%5 %%6 %%7"'
-            % relpath.encode("utf-8")
+            % (bash_path, relpath.encode("utf-8"))
         )
 
     def _write_vs_project(self, out_dir, basename, name, **kwargs):

python/mozbuild/mozbuild/mozconfig.py

@@ -10,6 +10,7 @@ import six
 import sys
 import subprocess
 import traceback
+from pathlib import Path
 from textwrap import dedent
 
 from mozboot.mozconfig import find_mozconfig
@@ -132,7 +133,11 @@ class MozconfigLoader(object):
         # directly calling sh mozconfig_loader.
         shell = "sh"
         if "MOZILLABUILD" in os.environ:
-            shell = os.environ["MOZILLABUILD"] + "/msys/bin/sh"
+            mozillabuild = os.environ["MOZILLABUILD"]
+            if (Path(mozillabuild) / "msys2").exists():
+                shell = mozillabuild + "/msys2/usr/bin/sh"
+            else:
+                shell = mozillabuild + "/msys/bin/sh"
         if sys.platform == "win32":
             shell = shell + ".exe"
 

python/mozbuild/mozbuild/repackaging/mar.py

@@ -11,6 +11,8 @@ import shutil
 import zipfile
 import tarfile
 import subprocess
+from pathlib import Path
+
 import mozpack.path as mozpath
 from mozbuild.repackaging.application_ini import get_application_ini_value
 from mozbuild.util import ensureParentDir
@@ -83,7 +85,12 @@ def repackage_mar(topsrcdir, package, mar, output, arch=None, mar_channel_id=Non
         if sys.platform == "win32":
             # make_full_update.sh is a bash script, and Windows needs to
             # explicitly call out the shell to execute the script from Python.
-            cmd.insert(0, env["MOZILLABUILD"] + "/msys/bin/bash.exe")
+
+            mozillabuild = os.environ["MOZILLABUILD"]
+            if (Path(mozillabuild) / "msys2").exists():
+                cmd.insert(0, mozillabuild + "/msys2/usr/bin/bash.exe")
+            else:
+                cmd.insert(0, mozillabuild + "/msys/bin/bash.exe")
         subprocess.check_call(cmd, env=env)
 
     finally: