Related bug, which led to the current behavior: bug #1173468
At the time, the decision was made to double the calculated value for
required free space. This is better than being undersized, but it's
over large; this sets the min free space value to 2 * N_kernels *
(sizeof(kernel_package_bits) + sizeof(initramfs)).
The high water mark for disk usage is actually:
1) all the newly installed kernels are unpacked to disk
2) any kernels being upgraded are unpacked onto disk, but have not yet
replaced the old files - i.e., unpacked as .dpkg-new (technically, I think this
can only be true of one upgraded kernel package at a time, but it's highly
unusual to ever have *a* kernel package being upgraded and exponentially
unusual to have more than one)
3) an initrd on disk for each of the new and upgraded kernels
4) one additional initrd on disk (initrd.img-$version.new) being prepared as a
replacement.
It's possible that 2) and 4) would never be unpacked at the same time,
in which case the high water mark would actually be 1 + 3 + MAX(2,4).
But this is only slightly smaller than 1+2+3+4 so probably doesn't
matter in practice.
I think therefore that we should calculate N_kernels *
sizeof(kernel_package_bits) + (N_kernels + 1) * sizeof(initramfs) and
use that as the freespace value. This will require a moderate refactor
between update-manager and ubuntu-release-upgrader.
The current fudge factor for kernel growth over time - currently, 1MiB
additional per kernel - should be retained.
** Also affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1646222
Title:
calculation of needed free space in /boot is inaccurate and causes
refusal to upgrade
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