1 (* Diskimage library for reading disk images.
2 (C) Copyright 2007-2008 Richard W.M. Jones, Red Hat Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 include Diskimage_utils
26 let partition_types = [
27 "MBR", Diskimage_mbr.probe_mbr;
30 let filesystem_types = [
31 "ext2", Diskimage_ext2.probe_ext2;
32 "linux_swap", Diskimage_linux_swap.probe_swap;
36 "LVM", (Diskimage_lvm2.probe_pv, Diskimage_lvm2.list_lvs);
39 (* Probe a device for partitions. Returns [Some parts] or [None]. *)
40 let probe_for_partitions dev =
41 if !debug then eprintf "probing for partitions on %s ...\n%!" dev#name;
42 let rec loop = function
44 | (parts_name, probe_fn) :: rest ->
45 try Some (probe_fn dev)
46 with Not_found -> loop rest
48 let r = loop partition_types in
51 | None -> eprintf "no partitions found on %s\n%!" dev#name
52 | Some { parts_name = name; parts = parts } ->
53 eprintf "found %d %s partitions on %s:\n"
54 (List.length parts) name dev#name;
55 List.iter (fun p -> eprintf "\t%s\n%!" (string_of_partition p)) parts
59 (* Probe a device for a filesystem. Returns [Some fs] or [None]. *)
60 let probe_for_filesystem dev =
61 if !debug then eprintf "probing for a filesystem on %s ...\n%!" dev#name;
62 let rec loop = function
64 | (fs_name, probe_fn) :: rest ->
65 try Some (probe_fn dev)
66 with Not_found -> loop rest
68 let r = loop filesystem_types in
71 | None -> eprintf "no filesystem found on %s\n%!" dev#name
73 eprintf "found a filesystem on %s:\n" dev#name;
74 eprintf "\t%s\n%!" (string_of_filesystem fs)
78 (* Probe a device for a PV. Returns [Some lvm_name] or [None]. *)
79 let probe_for_pv dev =
80 if !debug then eprintf "probing if %s is a PV ...\n%!" dev#name;
81 let rec loop = function
83 | (lvm_name, (probe_fn, _)) :: rest ->
84 try Some (probe_fn lvm_name dev)
85 with Not_found -> loop rest
87 let r = loop lvm_types in
90 | None -> eprintf "no PV found on %s\n%!" dev#name
91 | Some { lvm_plugin_id = name } ->
92 eprintf "%s contains a %s PV\n%!" dev#name name
96 let list_lvs lvm_name devs =
97 let _, list_lvs_fn = List.assoc lvm_name lvm_types in
100 (* Create machine description. *)
101 let open_machine name disks =
102 let disks = List.map (
104 let dev = new block_device path in
105 { d_name = name; d_dev = dev; d_content = `Unknown }
107 { m_name = name; m_disks = disks; m_lv_filesystems = [] }
109 let close_machine { m_disks = m_disks } =
110 (* Only close the disks, assume all other devices are derived from them. *)
111 List.iter (fun { d_dev = d_dev } -> d_dev#close ()) m_disks
113 let scan_machine ({ m_disks = m_disks } as machine) =
114 let m_disks = List.map (
115 fun ({ d_dev = dev } as disk) ->
116 (* See if it is partitioned first. *)
117 let parts = probe_for_partitions dev in
120 { disk with d_content = `Partitions parts }
122 (* Not partitioned. Does it contain a filesystem? *)
123 let fs = probe_for_filesystem dev in
126 { disk with d_content = `Filesystem fs }
128 (* Not partitioned, no filesystem, is it a PV? *)
129 let pv = probe_for_pv dev in
132 { disk with d_content = `PhysicalVolume lvm_name }
134 disk (* Spare/unknown. *)
137 (* Now we have either detected partitions or a filesystem on each
138 * physical device (or perhaps neither). See what is on those
141 let m_disks = List.map (
143 | ({ d_dev = dev; d_content = `Partitions parts } as disk) ->
146 if p.part_status = Bootable || p.part_status = Nonbootable then (
147 let fs = probe_for_filesystem p.part_dev in
150 { p with part_content = `Filesystem fs }
153 let pv = probe_for_pv p.part_dev in
156 { p with part_content = `PhysicalVolume lvm_name }
158 p (* Spare/unknown. *)
161 let parts = { parts with parts = ps } in
162 { disk with d_content = `Partitions parts }
166 (* LVM filesystem detection
168 * Look for all disks/partitions which have been identified as PVs
169 * and pass those back to the respective LVM plugin for LV detection.
171 * (Note - a two-stage process because an LV can be spread over
172 * several PVs, so we have to detect all PVs belonging to a
175 * XXX To deal with RAID (ie. md devices) we will need to loop
176 * around here because RAID is like LVM except that they normally
177 * present as block devices which can be used by LVM.
179 (* First: LV detection.
180 * Find all physical volumes, can be disks or partitions.
182 let pvs_on_disks = List.filter_map (
185 d_content = `PhysicalVolume pv } -> Some (pv, d_dev)
188 let pvs_on_partitions = List.map (
190 | { d_content = `Partitions { parts = parts } } ->
193 | { part_dev = part_dev;
194 part_content = `PhysicalVolume pv } ->
200 let lvs = List.concat (pvs_on_disks :: pvs_on_partitions) in
202 (* Second: filesystem on LV detection.
203 * Group the LVs by plug-in type.
205 let cmp (a,_) (b,_) = compare a b in
206 let lvs = List.sort ~cmp lvs in
207 let lvs = group_by lvs in
210 List.map (fun (pv, devs) -> list_lvs pv.lvm_plugin_id devs) lvs in
211 let lvs = List.concat lvs in
213 (* lvs is a list of potential LV devices. Now run them through the
214 * probes to see if any contain filesystems.
218 fun ({ lv_dev = dev } as lv) ->
219 match probe_for_filesystem dev with
220 | Some fs -> Some (lv, fs)
226 m_lv_filesystems = filesystems }