tree 7d6a864a7833440be65afc448072dc10b535bc1c
parent 186a3bb4b0939837c855a4f0689d4a4401aff608
author Jay Conrod <jayconrod@google.com> 1625593098 -0700
committer Jay Conrod <jayconrod@google.com> 1625695062 +0000

cmd/go: don't lock .mod and .sum files for read in overlay

On Plan 9, locking a file requires a chmod call. In general, the go
command should not modify files in the overlay, even metadata. With
this change, we won't lock these files for reading.

The go command already reported errors when attempting to write these
files if they were in the overlay, but this change moves those checks
to the point of access for clearer error
messages. cmd/go/internal/lockedfile no longer imports
cmd/go/internal/fsys.

Fixes #44700

Change-Id: Ib544459dd6cf56ca0f7a27b3285f045f08040d7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/333012
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>