[PATCH] mountlist: fix local drive detection on cygwin

[Eric Blake]

* lib/mountlist.c (ME_REMOTE) [__CYGWIN__]: Provide implementation
that works for cygwin.

Signed-off-by: Eric Blake <address@hidden>
---

Any objections to applying this patch?  I used it when building
the official cygwin port of coreutils 8.8.  In cygwin's getmntent()
implementation, all mount points are mapped to a windows-style
path (but using / instead of \), therefore, even local disks begin
with a drive letter, and are rejected by the default ME_REMOTE.

 ChangeLog       |    6 ++++++
 lib/mountlist.c |   24 ++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 0a17782..4074c37 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-12-28  Eric Blake  <address@hidden>
+
+       mountlist: fix local drive detection on cygwin
+       * lib/mountlist.c (ME_REMOTE) [__CYGWIN__]: Provide implementation
+       that works for cygwin.
+
 2010-12-28  Jim Meyering  <address@hidden>

        regex: don't infloop on persistent failing calloc
diff --git a/lib/mountlist.c b/lib/mountlist.c
index 996b71a..ff1e525 100644
--- a/lib/mountlist.c
+++ b/lib/mountlist.c
@@ -156,6 +156,30 @@
      || strcmp (Fs_type, "ignore") == 0)
 #endif

+#ifdef __CYGWIN__
+# include <windows.h>
+# define ME_REMOTE me_remote
+/* All cygwin mount points include `:' or start with `//'; so it
+   requires a native Windows call to determine remote disks.  */
+static bool
+me_remote (char const *fs_name, char const *fs_type)
+{
+  if (fs_name[0] && fs_name[1] == ':')
+    {
+      char const drive[3] = { fs_name[0], ':' };
+      switch (GetDriveType (drive))
+        {
+        case DRIVE_REMOVABLE:
+        case DRIVE_FIXED:
+        case DRIVE_CDROM:
+        case DRIVE_RAMDISK:
+          return false;
+        }
+    }
+  return true;
+}
+#endif
+
 #ifndef ME_REMOTE
 /* A file system is `remote' if its Fs_name contains a `:'
    or if (it is of type (smbfs or cifs) and its Fs_name starts with `//').  */
-- 
1.7.3.4