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rrd: use saturating_sub to avoid underflow 

Without this, the tests fail in debug mode.
Also having start (u64) underflow to a value greater than end does
not really make sense

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-10-28 11:40:44 +02:00 committed by Wolfgang Bumiller
parent 38517ca053
commit 5c1cabdea1
1 changed files with 1 additions and 1 deletions
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2
proxmox-rrd/src/rrd.rs
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@ -469,7 +469,7 @@ impl RRD {
match rra {
Some(rra) => {
let end = end.unwrap_or_else(|| proxmox_time::epoch_f64() as u64);
let start = start.unwrap_or(end - 10*rra.resolution);
let start = start.unwrap_or(end.saturating_sub(10*rra.resolution));
Ok(rra.extract_data(start, end, self.source.last_update))
}
None => bail!("unable to find RRA suitable ({:?}:{})", cf, resolution),