The DPDK project has defined syntax for a "Depends-on" tag. A contributor can add this label to their patch or cover letter if it depends on another patch or series that has not yet been applied to the target branch.

The syntax for this tag and where it appears in a patch file is as follows:

... MIME headers and such go here ... Some commit message Signed-off-by: someone --- Depends-on: patch-##### ("title of patch") Depends-on: series-##### ("title of series") ... git diff summary goes here ... --- ... diff goes here ... 

There can be multiple of these tags defined with differing values. An implementation is intended to collect them into a list. When applying a patch which has these tags, they should be applied in the order listed in the patch file. This process is not recursive, as in if the dependents of a patch have additional dependents, those are not applied.

The ask is for, when running git pw patch apply <id> or git pw series apply <id>, the command will scan for these dependent patches or series and apply them automatically as described above.

Would this functionality be useful to other projects, and appropriate to add to git-pw?