Fix #1870: Race condition with some virus scanners #1873
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Some virus scanners take out handles on files we are going to rename, causing access errors and preventing the rename. Typically this is short lived. Retry rather than erroring. No feedback given at the moment, and it will be a much larger patch to do so - as this is a regression fix I'd like to get it in and released and follow up with something thread all the UI channels down to this layer later (e.g. an implicit context mechanism of some sort perhaps?)
kinnison
suggested changes
May 25, 2019
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This will happen to wsl v1 users on windows too as they share a file system.
…On Sun, 26 May 2019, 07:24 Daniel Silverstone, ***@***.***> wrote:
***@***.**** requested changes on this pull request.
Looks sound, thank you for doing the work with the retry crate too.
One point to address
------------------------------
In src/utils/utils.rs
<#1873 (comment)>:
> @@ -651,7 +654,21 @@ pub fn toolchain_sort<T: AsRef<str>>(v: &mut Vec<T>) {
}
fn rename(name: &'static str, src: &Path, dest: &Path) -> Result<()> {
- fs::rename(src, dest).chain_err(|| ErrorKind::RenamingFile {
+ // #1870
+ // 21 fib steps from 1 sums to ~28 seconds, hopefully more than enough
+ // for our previous poor performance that avoided the race condition with
+ // McAfee and Norton.
+ retry(
+ Fibonacci::from_millis(1).map(jitter).take(21),
+ || match fs::rename(src, dest) {
+ Ok(v) => OperationResult::Ok(v),
+ Err(e) => match e.kind() {
+ io::ErrorKind::PermissionDenied => OperationResult::Retry(e),
I suppose, on a Linux system (or mac) where the EPERM was actually more
to do with someone chown()ing their stuff oddly, this will end up
consuming 28s before failing -- should we fail faster by making this
somehow conditional on Windows?
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Accepted. |
kinnison
approved these changes
May 25, 2019
|
I think the appveyor failure is spurious. |
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Some virus scanners take out handles on files we are going to
rename, causing access errors and preventing the rename. Typically
this is short lived. Retry rather than erroring.
No feedback given at the moment, and depends on an unreleased
retry, so WIP...