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tests: Rely on wtmp (the login records) to count reboot times

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The systemd journal has a known issue of generating large size logs[1],
which makes it unreliable as a source for retrieving system
information, such as for counting reboot times. This is particularly
problematic on disk-constrained systems, like the VMs we launched for
our integration tests, where the disk size is normally 2GB. By default,
the systemd journal has a size limit of 10% of the size of the
underlying file system (e.g. around 200MB for the VMs of our integration
tests), which would remove archived journal files on demand.

A better alternative to count reboot times is based on information from
`wtmp` (e.g. the login records) which is much more concise and can be
accessed via the `last` command.

[1] https://github.com/systemd/systemd/issues/5285

Fixes: #4749

Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2022-10-12 16:39:51 -07:00 committed by Rob Bradford
parent ffc222b26e
commit 958ef69295
2 changed files with 2 additions and 5 deletions
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2
test_infra/src/lib.rs
View File

@ -1085,7 +1085,7 @@ impl Guest {
}
pub fn reboot_linux(&self, current_reboot_count: u32, custom_timeout: Option<i32>) {
let list_boots_cmd = "sudo journalctl --list-boots | wc -l";
let list_boots_cmd = "sudo last | grep -c reboot";
let boot_count = self
.ssh_command(list_boots_cmd)
.unwrap()

5
tests/integration.rs
View File

@ -1882,11 +1882,8 @@ fn _test_virtio_iommu(acpi: bool) {
}
fn get_reboot_count(guest: &Guest) -> u32 {
// Ensure that the current boot journal is written so reboot counts are valid
guest.ssh_command("sudo journalctl --sync").unwrap();
guest
.ssh_command("sudo journalctl --list-boots | wc -l")
.ssh_command("sudo last | grep -c reboot")
.unwrap()
.trim()
.parse::<u32>()