mingw: add a regression test for pushing to UNC paths

On Windows, there are "UNC paths" to access network (AKA shared)
folders, of the form \\server\sharename\directory. This provides a
convenient way for Windows developers to share their Git repositories
without having to have a dedicated server.

Git for Windows v2.11.0 introduced a regression where pushing to said
UNC paths no longer works, although fetching and cloning still does, as
reported here: https://github.com/git-for-windows/git/issues/979

This regression was fixed in 7814fbe3f1 (normalize_path_copy(): fix
pushing to //server/share/dir on Windows, 2016-12-14).

Let's make sure that it does not regress again, by introducing a test
that uses so-called "administrative shares": disk volumes are
automatically shared under certain circumstances, e.g.  the C: drive is
shared as \\localhost\c$. The test needs to be skipped if the current
directory is inaccessible via said administrative share, of course.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t5580-clone-push-unc.sh b/t/t5580-clone-push-unc.sh
new file mode 100755 (executable)
index 0000000..b195f71
--- /dev/null
+++ b/t/t5580-clone-push-unc.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+test_description='various UNC path tests (Windows-only)'
+. ./test-lib.sh
+
+if ! test_have_prereq MINGW; then
+       skip_all='skipping UNC path tests, requires Windows'
+       test_done
+fi
+
+UNCPATH="$(pwd)"
+case "$UNCPATH" in
+[A-Z]:*)
+       # Use administrative share e.g. \\localhost\C$\git-sdk-64\usr\src\git
+       # (we use forward slashes here because MSYS2 and Git accept them, and
+       # they are easier on the eyes)
+       UNCPATH="//localhost/${UNCPATH%%:*}\$/${UNCPATH#?:}"
+       test -d "$UNCPATH" || {
+               skip_all='could not access administrative share; skipping'
+               test_done
+       }
+       ;;
+*)
+       skip_all='skipping UNC path tests, cannot determine current path as UNC'
+       test_done
+       ;;
+esac
+
+test_expect_success setup '
+       test_commit initial
+'
+
+test_expect_success clone '
+       git clone "file://$UNCPATH" clone
+'
+
+test_expect_success push '
+       (
+               cd clone &&
+               git checkout -b to-push &&
+               test_commit to-push &&
+               git push origin HEAD
+       ) &&
+       rev="$(git -C clone rev-parse --verify refs/heads/to-push)" &&
+       test "$rev" = "$(git rev-parse --verify refs/heads/to-push)"
+'
+
+test_done