daemon: move Lvm.lv_canonical to new Lvm_utils module

This way the Lvm module contains only the OCaml implementations of LVM
daemon APIs.

This is simple refactoring, with no functional changes.

daemon/Makefile.am

@@ -268,6 +268,7 @@ SOURCES_MLI = \
 	link.mli \
 	listfs.mli \
 	lvm.mli \
+	lvm_utils.mli \
 	md.mli \
 	mount.mli \
 	mountable.mli \
@@ -296,6 +297,7 @@ SOURCES_ML = \
 	ldm.ml \
 	link.ml \
 	lvm.ml \
+	lvm_utils.ml \
 	findfs.ml \
 	md.ml \
 	mount.ml \

daemon/findfs.ml

@@ -44,7 +44,7 @@ and findfs tag str =
 
   if String.is_prefix out "/dev/mapper/" ||
      String.is_prefix out "/dev/dm-" then (
-    match Lvm.lv_canonical out with
+    match Lvm_utils.lv_canonical out with
     | None ->
        (* Ignore the case where 'out' doesn't appear to be an LV.
         * The best we can do is return the original as-is.

daemon/inspect_fs_unix_fstab.ml

@@ -327,7 +327,7 @@ and resolve_fstab_device spec md_map os_type =
      * we have implemented lvm_canonical_lv_name in the daemon.
      *)
     try
-      match Lvm.lv_canonical spec with
+      match Lvm_utils.lv_canonical spec with
       | None -> Mountable.of_device spec
       | Some device -> Mountable.of_device device
     with

daemon/lvm.ml

@@ -97,30 +97,3 @@ and filter_convert_old_lvs_output out =
   ) lines in
 
   List.sort compare lines
-
-(* Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
- * to a canonical one.
- *
- * This is harder than it should be.  A LV device like /dev/VG/LV is
- * really a symlink to a device-mapper device like /dev/dm-0.  However
- * at the device-mapper (kernel) level, nothing is really known about
- * LVM (a userspace concept).  Therefore we use a convoluted method to
- * determine this, by listing out known LVs and checking whether the
- * rdev (major/minor) of the device we are passed matches any of them.
- *
- * Note use of 'stat' instead of 'lstat' so that symlinks are fully
- * resolved.
- *)
-let lv_canonical device =
-  let stat1 = stat device in
-  let lvs = lvs () in
-  try
-    Some (
-      List.find (
-        fun lv ->
-          let stat2 = stat lv in
-          stat1.st_rdev = stat2.st_rdev
-      ) lvs
-    )
-  with
-  | Not_found -> None

daemon/lvm.mli

@@ -17,13 +17,3 @@
  *)
 
 val lvs : unit -> string list
-
-val lv_canonical : string -> string option
-(** Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
-    to a canonical one.
-
-    On error this raises an exception.  There are two possible non-error
-    return cases:
-
-    Some lv = conversion was successful, returning the canonical LV
-    None = input path was not an LV, it could not be made canonical *)

daemon/lvm_utils.ml

@@ -0,0 +1,48 @@
+(* guestfs-inspection
+ * Copyright (C) 2009-2018 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *)
+
+open Unix
+
+open Utils
+
+(* Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
+ * to a canonical one.
+ *
+ * This is harder than it should be.  A LV device like /dev/VG/LV is
+ * really a symlink to a device-mapper device like /dev/dm-0.  However
+ * at the device-mapper (kernel) level, nothing is really known about
+ * LVM (a userspace concept).  Therefore we use a convoluted method to
+ * determine this, by listing out known LVs and checking whether the
+ * rdev (major/minor) of the device we are passed matches any of them.
+ *
+ * Note use of 'stat' instead of 'lstat' so that symlinks are fully
+ * resolved.
+ *)
+let lv_canonical device =
+  let stat1 = stat device in
+  let lvs = Lvm.lvs () in
+  try
+    Some (
+      List.find (
+        fun lv ->
+          let stat2 = stat lv in
+          stat1.st_rdev = stat2.st_rdev
+      ) lvs
+    )
+  with
+  | Not_found -> None

daemon/lvm_utils.mli

@@ -0,0 +1,27 @@
+(* guestfs-inspection
+ * Copyright (C) 2009-2018 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *)
+
+val lv_canonical : string -> string option
+(** Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
+    to a canonical one.
+
+    On error this raises an exception.  There are two possible non-error
+    return cases:
+
+    Some lv = conversion was successful, returning the canonical LV
+    None = input path was not an LV, it could not be made canonical *)