libguestfs java_rhel7.0（libguestfs） 挂载windows虚机镜像

1 rhel7 挂载windows虚机镜像

在rhel 7.0 内挂载windows虚拟镜像，需要ntfs-3g的软件包。当你安装该软件包后，挂载windows虚拟机镜像时，仍然出现下面问题：

[[e-mail]]# mount /opt/windowsxp_32.img /mnt

mount: /dev/loop0 is write-protected, mounting read-only

mount: unknown filesystem type '(null)'

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[[e-mail]]# mount /opt/windowsxp_32.img  /mnt

mount:/dev/loop0iswrite-protected,mountingread-only

mount:unknownfilesystemtype'(null)'

或者使用mount.ntfs-3g进行挂载。

[[e-mail]]# mount.ntfs-3g /opt/windowsxp_32.img /mnt -o loop

NTFS signature is missing.

Failed to mount '/opt/windowsxp_32.img': Invalid argument

The device '/opt/windowsxp_32.img' doesn't seem to have a valid NTFS.

Maybe the wrong device is used? Or the whole disk instead of a

partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

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[[e-mail]]# mount.ntfs-3g /opt/windowsxp_32.img  /mnt -o loop

NTFSsignatureismissing.

Failedtomount'/opt/windowsxp_32.img':Invalidargument

Thedevice'/opt/windowsxp_32.img'doesn'tseemtohaveavalidNTFS.

Maybethewrongdeviceisused?Orthewholediskinsteadofa

partition(e.g./dev/sda,not/dev/sda1)?Ortheotherwayaround?

问题是无法挂载分区，详细信息见上面的报错信息。

主要是因为windowsxp_32.img镜像的起始分区是1，因为磁盘的第一个字节包含主引导记录和一些磁盘结构，如MS-DOS结构。如果你使用0作为第一个分区的起始，我们使用parted查看该分区结构，libparted会跳过开始的几个字节的信息允许查看分区结构。

[root@localhost ~]# parted /opt/windowsxp_32.img unit b print

Model: (file)

Disk /opt/windowsxp_32.img: 10737418240B

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Disk Flags:

Number Start End Size Type File system Flags

1 32256B 10725765119B 10725732864B primary ntfs boot

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[root@localhost~]# parted  /opt/windowsxp_32.img  unit b print

Model:(file)

Disk/opt/windowsxp_32.img:10737418240B

Sectorsize(logical/physical):512B/512B

PartitionTable:msdos

DiskFlags:

NumberStartEndSizeTypeFilesystemFlags

132256B10725765119B10725732864Bprimaryntfsboot

我们可以看到起始的位置为32kB的地方，我们利用offset设置32kB的分区偏移量。32kB的起始，因为使用的工具太旧了。如果你使用的是512字节的扇区，实际的分区偏移可能是32256对应的63Sector(磁区)。

我们尝试使用offset进行分区挂载：

[[e-mail] opt]# mount -o loop,ro,offset=32256 windowsxp_32.img /mnt

[[e-mail] opt]# cd /mnt

[[e-mail] mnt]# ls

bootfont.bin ntldr

boot.ini pagefile.sys

CONFIG.SYS Program Files

Documents and Settings RECYCLER

hiberfil.sys System Volume Information

IO.SYS temp

Java virtio-win-0.1-74

MSDOS.SYS WINDOWS

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[[e-mail]]# mount -o loop,ro,offset=32256 windowsxp_32.img  /mnt

[[e-mail]]# cd /mnt

[[e-mail]]# ls

bootfont.binntldr

boot.inipagefile.sys

CONFIG.SYSProgramFiles

DocumentsandSettingsRECYCLER

hiberfil.sysSystemVolumeInformation

IO.SYStemp

Javavirtio-win-0.1-74

MSDOS.SYSWINDOWS

2 libguestfs 挂载windows虚机镜像

当使用libguestfs挂载windows虚机镜像时，也出现了这个问题.

[[e-mail] opt]# guestfish -a windowsxp_32.img

Welcome to guestfish, the guest filesystem shell for

editing virtual machine filesystems and disk images.

Type: 'help' for help on commands

'man' to read the manual

'quit' to quit the shell

> run

100%

> list-filesystems

/dev/sda1: ntfs

> mount /dev/sda1 /

libguestfs: error: mount: /dev/sda1 on / (options: ''): mount: unknown filesystem type 'ntfs'

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[[e-mail]]# guestfish -a windowsxp_32.img

Welcometoguestfish,theguestfilesystemshellfor

editingvirtualmachinefilesystemsanddiskimages.

Type:'help'forhelponcommands

'man'toreadthemanual

'quit'toquittheshell

>run

100%

>list-filesystems

/dev/sda1:ntfs

>mount/dev/sda1/

libguestfs:error:mount:/dev/sda1on/(options:''):mount:unknownfilesystemtype'ntfs'

需要安装libguestfs-winsupport

> mount /dev/sda1 /

> ll /

total 2097129

drwxrwxrwx 1 root root 4096 Dec 22 21:46 .

drwxr-xr-x 23 root root 4096 Dec 22 21:54 ..

-rwxrwxrwx 1 root root 0 Jan 8 2014 AUTOEXEC.BAT

-rwxrwxrwx 1 root root 0 Jan 8 2014 CONFIG.SYS

drwxrwxrwx 1 root root 4096 Mar 10 2014 Documents and Settings

-rwxrwxrwx 1 root root 0 Jan 8 2014 IO.SYS

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>mount/dev/sda1/

>ll/

total2097129

drwxrwxrwx1rootroot4096Dec2221:46.

drwxr-xr-x23rootroot4096Dec2221:54..

-rwxrwxrwx1rootroot0Jan82014AUTOEXEC.BAT

-rwxrwxrwx1rootroot0Jan82014CONFIG.SYS

drwxrwxrwx1rootroot4096Mar102014DocumentsandSettings

-rwxrwxrwx1rootroot0Jan82014IO.SYS