boot-space — Free space on /boot and the EFI partition

A small separate /boot fills up with old kernels; when it's full, installing the next kernel fails half-way and can leave the system unbootable.

At a glance

ID	boot-space
Category	Boot
Needs root	no
Needs programs	none
Compares with a snapshot	no
Options	2

What it checks

• Free space and free inodes on /boot and /boot/efi, when they are separate filesystems. If /boot is just a directory on /, it's covered by disk-space instead.

Findings

Severity	Finding	What to do
critical / warning	Low free space on mount: N% free	Below critical_pct / warning_pct. For /boot: list kernels with dpkg -l 'linux-image-*', then sudo apt autoremove --purge. For /boot/efi: remove vendor directories under /boot/efi/EFI/ you no longer boot.
critical / warning	Low free inodes on mount: N% free	As above.

Commands it runs

None: it reads filesystem statistics (statvfs).

Limitations

• Percentages suit small partitions; a nearly full but large /boot may still have room for several kernels.

Options

Option	Default	Description
warning_pct	25.0	Warn when free space or inodes drop below this percentage
critical_pct	10.0	Critical when free space or inodes drop below this percentage

Set them in the configuration file under checks: boot-space:, or for one run with --check-option:

checks:
  boot-space:
    enabled: true
    warning_pct: 25.0
    critical_pct: 10.0

pydebuprep report --check-option boot-space.warning_pct=25.0