Mount
Todo Merge all Mount articles here.
Remounting from Read-Only to Read-Write
You can remount something that's mounted read-only by using the remount option.
# mount -o remount,rw /
Mounting a disk image without root
Using udisksctl, you can mount disk images without requiring root or sudoers access.
$ dd if=/dev/zero of=test.img bs=1M count=100
$ udisksctl loop-setup -f test.img
Mapped file $PATH_TO_IMAGE as /dev/loop0.
Depending on your system, this may have triggered the loopmount to automount somewhere in /run/media/username. If nothing was mounted, manually mount the loopmount device:
$ udisksctl mount -b /dev/loop0
Mounted /dev/loop0 at /media/$USER/$IMAGE_NAME
To unmount the filesystem:
$ udisksctl unmount -b /dev/loop0
$ udisksctl loop-delete -b /dev/loop0
See Also: https://wiki.debian.org/ManipulatingISOs
Mounting disk image partitions
To mount a specific partition inside a disk image, use the fdisk utility to see where the partition boundaries are.
# fdisk -l out.bin
Disk out.bin: 58.6 MiB, 61440000 bytes, 120000 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
Disklabel type: dos
Disk identifier: 0x000981cb
Device Boot Start End Sectors Size Id Type
out.bin1 8192 122879 114688 56M c W95 FAT32 (LBA)
out.bin2 122880 5785599 5662720 2.7G 83 Linux
The first partition starts on sector 8192. Since each sector is 512 bytes, we can mount this particular partition by passing an offset of 8192 * 512 bytes.
# mount -o loop,offset=$((8192 * 512)) out.bin /mnt/card
Alternatively, you may want to set up a loopback device specifically for a partition using losetup:
# losetup /dev/loop0 disk.img -o $((10860003 * 512))
# file -s /dev/loop0
/dev/loop0: Linux rev 1.0 ext3 filesystem data
# mount /dev/loop0 /mnt
[...]
# umount /mnt
# losetup -d /dev/loop0
See Also