Cygwin: Add /dev/disk/by-id symlinks

The new directory '/dev/disk/by-id' provides symlinks for each
disk and its partitions:
'BUSTYPE-[VENDOR_]PRODUCT_SERIAL[-partN]' -> '../../sdX[N]'.
This is based on strings provided by STORAGE_DEVICE_DESCRIPTOR.
If this information is too short, a 128-bit hash of the
STORAGE_DEVICE_UNIQUE_IDENTIFIER raw data is added.
Administrator privileges are not required.

Signed-off-by: Christian Franke <christian.franke@t-online.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/winsup/cygwin/mount.cc b/winsup/cygwin/mount.cc
index 36ab042..13ace62 100644
--- a/winsup/cygwin/mount.cc
+++ b/winsup/cygwin/mount.cc
@@ -35,6 +35,9 @@ details. */
    (path[mount_table->cygdrive_len + 1] == '/' || \
     !path[mount_table->cygdrive_len + 1]))
 
+#define isdev_disk(path) \
+  (path_prefix_p (dev_disk, (path), dev_disk_len, false))
+
 #define isproc(path) \
   (path_prefix_p (proc, (path), proc_len, false))
 
@@ -685,6 +688,13 @@ mount_info::conv_to_win32_path (const char *src_path, char *dst, device& dev,
       /* Go through chroot check */
       goto out;
     }
+  if (isdev_disk (src_path))
+    {
+      dev = *dev_disk_dev;
+      *flags = 0;
+      strcpy (dst, src_path);
+      goto out;
+    }
   if (isproc (src_path))
     {
       dev = *proc_dev;