[Virtio-fs] [PATCH v2 6/6] tools/virtiofsd: xattr name mapping examples

[Ján Tomko]

On a Thursday in 2020, Dr. David Alan Gilbert (git) wrote:
>From: "Dr. David Alan Gilbert" <dgilbert at redhat.com>
>
>Add a few examples of xattrmaps to the documentation.
>
>Signed-off-by: Dr. David Alan Gilbert <dgilbert at redhat.com>
>---
> docs/tools/virtiofsd.rst | 49 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 49 insertions(+)
>
>diff --git a/docs/tools/virtiofsd.rst b/docs/tools/virtiofsd.rst
>index 2efa16d3c5..a138549862 100644
>--- a/docs/tools/virtiofsd.rst
>+++ b/docs/tools/virtiofsd.rst
>@@ -161,6 +161,55 @@ in which case a 'server' rule will always match on all names from
> the server.
>
>
>+xattr-mapping Examples
>+----------------------
>+
>+1) Prefix all attributes with 'user.virtiofs.'
>+
>+::
>+
>+-o xattrmap=":all:prefix::user.virtiofs.::all:bad:::"
>+
>+
>+This uses two rules, using : as the field separator;
>+the first rule prefixes and strips 'user.virtiofs.',
>+the second rule hides any non-prefixed attributes that
>+the host set.
>+
>+2) Prefix 'trusted.' attributes, allow others through
>+
>+::
>+
>+   "/all/prefix/trusted./user.virtiofs./
>+    /server/bad//trusted./
>+    /client/bad/user.virtiofs.trusted.//
>+    /all/ok///"
>+
>+
>+Here there are four rules, using / as the field
>+separator, and also demonstrating that new lines can
>+be included between rules.
>+The first rule is the prefixing of 'trusted.'.
>+The second rule hides unprefixed 'trusted.' attributes
>+on the host.
>+The third rule stops a guest from explicitily setting

explicitly

>+the 'user.viritofs.trusted.' path directly.
>+Finally, the fourth rule lets all remaining attributes
>+through.
>+
>+3) Hide 'security.' attributes, and allow everything else
>+
>+::
>+
>+    "/all/bad/security./security./
>+     /all/ok///'
>+
>+The first rule combines what could be separate client and server
>+rules into a single 'all' rule, matching 'security.' in either
>+client arguments or lists returned from the host.  This stops
>+the client seeing any 'security.' attributes on the server and
>+stops it setting  any.

extra space.

Reviewed-by: Ján Tomko <jtomko at redhat.com>

Jano
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