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bug#43062: --expose in vm does not reflect file modifications in guest
From: |
Ludovic Courtès |
Subject: |
bug#43062: --expose in vm does not reflect file modifications in guest |
Date: |
Fri, 28 Aug 2020 16:11:26 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Hi,
elaexuotee--- via Bug reports for GNU Guix <bug-guix@gnu.org> skribis:
> When using --expose to mirror a path between host and guest, the guest mirror
> fails to reflect file modifications from the host. However, file creation and
> deletion are correctly propogated.
>
> To pick up file modifications in the guest, it is sufficient to remount
> mirroring 9p filesystem.
>
> Is this behaviour expected?
I believe this comes from the “cache=loose” 9p mount option added in
commit e0d96774dd48c29ccc4c90fea1f8f71850ab0879.
Does the patch below help?
Chris, what do you think? How would this affect the performance issues
that led to e0d96774dd48c29ccc4c90fea1f8f71850ab0879?
Thanks,
Ludo’.
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index 861f2a427a..80a8618729 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -699,7 +699,8 @@ of the GNU system as described by OS."
(device (file-system->mount-tag source))
(type "9p")
(flags (if writable? '() '(read-only)))
- (options "trans=virtio,cache=loose")
+ (options (string-append "trans=virtio"
+ (if writable? "" ",cache=loose")))
(check? #f)
(create-mount-point? #t)))))