fix regresion in Git.run() when win_bash (#14756)

conan/tools/scm/git.py

@@ -1,9 +1,9 @@
 import os
-from io import StringIO
 
 from conan.tools.files import chdir
 from conan.errors import ConanException
 from conans.util.files import mkdir
+from conans.util.runners import check_output_runner
 
 
 class Git:
@@ -25,9 +25,10 @@ def run(self, cmd):
         :return: The console output of the command.
         """
         with chdir(self._conanfile, self.folder):
-            output = StringIO()
-            self._conanfile.run(f"git {cmd}", stdout=output, quiet=True)
-            return output.getvalue().strip()
+            # We tried to use self.conanfile.run(), but it didn't work:
+            #  - when using win_bash, crashing because access to .settings (forbidden in source())
+            #  - the ``conan source`` command, not passing profiles, buildenv not injected
+            return check_output_runner("git {}".format(cmd)).strip()
 
     def get_commit(self):
         """

conans/test/functional/tools/scm/test_git.py

@@ -253,6 +253,48 @@ def source(self):
         assert "pkg/0.1: MYCMAKE: mycmake" in c.out
         assert "pkg/0.1: MYFILE: myheader!" in c.out
 
+    @pytest.mark.tool("msys2")
+    def test_clone_msys2_win_bash(self):
+        # To avoid regression in https://github.com/conan-io/conan/issues/14754
+        folder = os.path.join(temp_folder(), "myrepo")
+        url, commit = create_local_git_repo(files={"src/myfile.h": "myheader!",
+                                                   "CMakeLists.txt": "mycmake"}, folder=folder)
+
+        c = TestClient()
+        conanfile_win_bash = textwrap.dedent("""
+            import os
+            from conan import ConanFile
+            from conan.tools.scm import Git
+            from conan.tools.files import load
+
+            class Pkg(ConanFile):
+                name = "pkg"
+                version = "0.1"
+                win_bash = True
+
+                def layout(self):
+                    self.folders.source = "source"
+
+                def source(self):
+                    git = Git(self)
+                    git.clone(url="{url}", target=".")
+                    git.checkout(commit="{commit}")
+                    self.output.info("MYCMAKE: {{}}".format(load(self, "CMakeLists.txt")))
+                    self.output.info("MYFILE: {{}}".format(load(self, "src/myfile.h")))
+            """)
+        c.save({"conanfile.py": conanfile_win_bash.format(url=url, commit=commit)})
+        conf = "-c tools.microsoft.bash:subsystem=msys2 -c tools.microsoft.bash:path=bash.exe"
+        c.run(f"create . {conf}")
+        assert "pkg/0.1: MYCMAKE: mycmake" in c.out
+        assert "pkg/0.1: MYFILE: myheader!" in c.out
+
+        # It also works in local flow, not running in msys2 at all
+        c.run(f"source .")
+        assert "conanfile.py (pkg/0.1): MYCMAKE: mycmake" in c.out
+        assert "conanfile.py (pkg/0.1): MYFILE: myheader!" in c.out
+        assert c.load("source/src/myfile.h") == "myheader!"
+        assert c.load("source/CMakeLists.txt") == "mycmake"
+
 
 @pytest.mark.tool("git")
 class TestGitShallowClone: