New API: guestfs_canonical_device_name.

This API makes device names canonical, eg. /dev/vda1 -> /dev/sda1.

2 files changed, 24 insertions, 1 deletions

diff --git a/src/guestfs.c b/src/guestfs.c
index 561fab4f..32bcbeff 100644
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -996,3 +996,26 @@ guestfs___free_drives (struct drive **drives)
     i = next;
   }
 }
+
+char *
+guestfs__canonical_device_name (guestfs_h *g, const char *device)
+{
+  char *ret;
+
+  if (STRPREFIX (device, "/dev/hd") ||
+      STRPREFIX (device, "/dev/vd")) {
+    ret = safe_strdup (g, device);
+    ret[5] = 's';
+  }
+  else if (STRPREFIX (device, "/dev/mapper/") ||
+           STRPREFIX (device, "/dev/dm-")) {
+    /* XXX hide errors */
+    ret = guestfs_lvm_canonical_lv_name (g, device);
+    if (ret == NULL)
+      ret = safe_strdup (g, device);
+  }
+  else
+    ret = safe_strdup (g, device);
+
+  return ret;                   /* caller frees */
+}
diff --git a/src/guestfs.pod b/src/guestfs.pod
index fd8b70ca..6959f50c 100644
--- a/src/guestfs.pod
+++ b/src/guestfs.pod
@@ -1158,7 +1158,7 @@ C</dev/hda2> transparently.
 Note that this I<only> applies to parameters.  The
 L</guestfs_list_devices>, L</guestfs_list_partitions> and similar calls
 return the true names of the devices and partitions as known to the
-appliance.
+appliance, but see L</guestfs_canonical_device_name>.
 
 =head3 ALGORITHM FOR BLOCK DEVICE NAME TRANSLATION