无法挂载磁盘映像

Question

我有一个磁盘映像文件，我正在尝试使用循环设备在本地安装。使用 parted 我可以看到图像有两个分区，但是，我无法挂载第一个分区并losetup认为第二个分区不存在。有谁知道我如何挂载第二个分区？

/m/sf_VMShare ??? sudo losetup /dev/loop0 ./imm_image-2017-05-28.img
/m/sf_VMShare ??? sudo losetup -a
/dev/loop0: [0023]:99 (/media/sf_VMShare/imm_image-2017-05-28.img)
/m/sf_VMShare ??? sudo parted /dev/loop0 print
Model: Loopback device (loop)
Disk /dev/loop0: 1206MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size   Type     File system  Flags
 1      10.5MB  360MB   349MB  primary  ext4
 2      361MB   1205MB  844MB  primary  ext4

/m/sf_VMShare ??? sudo mount -t ext4 /dev/loop0p2 /tmp/vdisk
mount: special device /dev/loop0p2 does not exist
/m/sf_VMShare ??? sudo mount -t ext4 /dev/loop0p1 /tmp/vdisk 
mount: wrong fs type, bad option, bad superblock on /dev/loop0p1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

/m/sf_VMShare ??? mount | grep /tmp/vdisk
/m/sf_VMShare ???
/m/sf_VMShare ??? ls /dev/loop*
/dev/loop0    /dev/loop1  /dev/loop3  /dev/loop5  /dev/loop7
/dev/loop0p1  /dev/loop2  /dev/loop4  /dev/loop6  /dev/loop-control
/m/sf_VMShare ??? lsblk -f
NAME      FSTYPE LABEL MOUNTPOINT
sda                    
??sda1                 /
??sda2                 
??sda5                 [SWAP]
sdb                    
??sdb1                 /home/foo/workspace
sr0                    
loop0                  
??loop0p1              

Answer 1

如何在包含 msdos 分区表的完整磁盘映像中挂载分区。

工具：

• fdisk
• mount
• 计算器

获取镜像的分区布局。

sudo fdisk -l -u=sectors /work/loop_test/disk_image.img

示例输出：

Disk /work/loop_test/disk_image.img: 29 MB, 29629952 bytes
255 heads, 63 sectors/track, 3 cylinders, total 57871 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0009d7e5

                     Device Boot      Start         End      Blocks   Id  System
/work/loop_test/disk_image.img1       2048       18431        8192   83  Linux
/work/loop_test/disk_image.img2       18432      57343       19456    7  HPFS/NTFS/exFAT

计算从图像开始到分区开始的偏移量。在本例中为 ntfs 分区。

公式：

Sector size * Start = Offset
512 * 18432 = 9437184

挂载映像，传递所需分区的偏移量。

在本例中为 ntfs 分区。

sudo mount -o loop,offset=9437184 /work/loop_test/disk_image.img /mnt/ntfs_partition