Public bug reported:
If you try and specify the starting offset for the partition in sectors
and ask sfdisk to use the rest of the disk (with "+"), sfdisk will
incorrectly calculate the end cylinders and not create the partition.
For example
---
# dd if=/dev/zero of=/tmp/disk.img bs=1M count=10
# losetup -f /tmp/disk.img
# sfdisk -uS /dev/loop1 <<EOF
2048 + L *
0 0;
0 0;
0 0;
EOF
Checking that no-one is using this disk right now ...
BLKRRPART: Invalid argument
OK
Disk /dev/loop1: cannot get geometry
Disk /dev/loop1: 1 cylinders, 255 heads, 63 sectors/track
sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/loop1: unrecognized partition table type
Old situation:
No partitions found
New situation:
Warning: The partition table looks like it was made
for C/H/S=*/71/5 (instead of 1/255/63).
For this listing I'll assume that geometry.
Units = sectors of 512 bytes, counting from 0
Device Boot Start End #sectors Id System
/dev/loop1p1 * 2048 20479 18432 83 Linux
start: (c,h,s) expected (5,54,4) found (0,32,33)
end: (c,h,s) expected (57,48,5) found (1,70,5)
/dev/loop1p2 0 - 0 0 Empty
/dev/loop1p3 0 - 0 0 Empty
/dev/loop1p4 0 - 0 0 Empty
Warning: partition 1 does not end at a cylinder boundary
end of partition 1 has impossible value for cylinders: 1 (should be in 0-0)
sfdisk: I don't like these partitions - nothing changed.
(If you really want this, use the --force option.)
---
Using the --force flag writes out the correct partitions. I also note
this is fixed in 2.26, which has a large rewrite of sfdisk and uses
sectors by default
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1481158
Title:
sfdisk gets cylinder calculation wrong when using sectors
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