sim: Add metadata command

Only really needed for completeness, preferred content expressions can
match against metadata.

doc/git-annex-sim.mdwn

@@ -309,16 +309,6 @@ as passed to "git annex sim" while a simulation is running.
   Sets the trust level of the repository. This is equivilant to
   [[git-annex-trust]](1), [[git-annex-untrust]](1), etc.
 
-* `group repo group`
-
-  Add a repository to a group. This is equivilant to
-  [[git-annex-group]](1).
-
-* `ungroup repo group`
-
-  Remove a repository from a group. This is equivilant to
-  [[git-annex-ungroup]](1).
-
 * `wanted repo expression`
 
   Configure the preferred content of a repository. This is equivilant
@@ -352,6 +342,22 @@ as passed to "git annex sim" while a simulation is running.
   
   Configure the groupwanted to a random expression.
 
+* `group repo group`
+
+  Add a repository to a group. This is equivilant to
+  [[git-annex-group]](1).
+
+* `ungroup repo group`
+
+  Remove a repository from a group. This is equivilant to
+  [[git-annex-ungroup]](1).
+
+* `metadata filename expression`
+
+  Change the metadata of the simulated file. The expression is
+  in the same format as the --set option of the [[git-annex-metadata]]
+  command. For example: `metadata foo year=2025`
+
 * `maxsize repo size`
 
   Configure the maximum size of a repository. This is equivilant to

doc/todo/git-annex_proxies.mdwn

@@ -28,11 +28,7 @@ Planned schedule of work:
 
 ## work notes
 
-* Currently working in [[todo/proving_preferred_content_behavior]]
-  in the `sim` branch.
-
-* sim: Add support for metadata, so preferred content that matches on it
-  will work
+* Currently working in [[todo/proving_preferred_content_behavior]].
 
 * The sim cannot be safely interrupted, or two processes be run
   concurrently. Both unlike other git-annex commands. Either document these