[release-branch.go1.22] os: fix Chtimes test flakes
It appears that some builders (notably, linux-arm) have some additional
security software installed, which apparently reads the files created by
tests. As a result, test file atime is changed, making the test fail
like these:
=== RUN TestChtimesOmit
...
os_test.go:1475: atime mismatch, got: "2024-07-30 18:42:03.
450932494 +0000 UTC", want: "2024-07-30 18:42:02.
450932494 +0000 UTC"
=== RUN TestChtimes
...
os_test.go:1539: AccessTime didn't go backwards; was=2024-07-31 20:45:53.
390326147 +0000 UTC, after=2024-07-31 20:45:53.
394326118 +0000 UTC
According to inode(7), atime is changed when more than 0 bytes are read
from the file. So, one possible solution to these flakes is to make the
test files empty, so no one can read more than 0 bytes from them.
For #68687
For #68663
Fixes #68811
Change-Id: Ib9234567883ef7b16ff8811e3360cd26c2d6bdab
Reviewed-on: https://go-review.googlesource.com/c/go/+/604315
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Kirill Kolyshkin <kolyshkin@gmail.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
(cherry picked from commit
84266e1469cfa6fa8e1b41518528a96950db7562)
Reviewed-on: https://go-review.googlesource.com/c/go/+/605375
Reviewed-by: Carlos Amedee <carlos@golang.org>