Since Develop now relies on bundlebuilder to create its journal entries (.xo files), I have become familiar with the fragility of the activity bundle format. The original sin is that, if you have a bundle of files, you shouln't need a separate list of those files in MANIFEST. The various symptoms all flow from this: mistyped files (doesn't save), including the root directory in the paths (ditto), adding a file with cp but forgetting to add it to MANIFEST (deleted on next activity update), including MANIFEST itself in the manifest (no effect, a random source of variation)<br>
<br>What is the MANIFEST supposed to accomplish in the first place?<br><br>1. Something like .gitignore<br>problems: because it's a whitelist instead of a blacklist, there is always the possibility that, even if Develop carefully maintains the integrity, someone will add an important file behind Develop's back. This file would tend to be deleted on the next update.<br>
suggested solution: just use a file named .gitignore - follow the standard (though for simplicity's sake it would be OK to only obey the top-level gitignore). Moreover, we could have an implicit global .gitignore which would ignore (at least) .pyc files.<br>
<br>2. Give a clear ordering of the files for cryptographic signing purposes.<br>problems: obvious<br>solution: obviously just use a well-defined and documented ordering algorithm<br><br>So, my suggestion would be to abandon the MANIFEST and use .gitignore, with an implicit global default.<br>
<br>If not, I will have to rewrite Develop to take care of the MANIFEST automatically, and not show it for manual editing. Problems ensue: if the MANIFEST is absent or missing files, Develop will have to use a modal dialog box to ask what to do. This solution seems ugly to me.<br>
<br>.........................<br><br>While I'm writing an email on this stuff, I should include a brief discussion of activity auto-updates. Currently, an activity is reinstalled iff it is currently installed in Activities/ and the user runs a bundle with a different version in activity/<a href="http://activity.info">activity.info</a> . This means that in Develop, you have to change the version for every debugging cycle - pretty annoying. It also means that downgrades are treated identically to upgrades, and of course there is no security.<br>
<br>I suggest that:<br>-when running the same or previous versions (or, in the future, versions signed by someone you don't recognize as a developer for that activity), a modal dialog box should come up for a few seconds with the default option to not reinstall (which, if attempting to join a shared activity with a newer version, would mean not joining. Backwards compatibility, on the other hand, would be assumed, and graceful failure would be the activity's responsibility)<br>
<br>-develop a two level system of signing activity bundles: "maintainers" would have to sign/revoke "maintainers" and "developers", and "developers" would sign specific versions of the activity bundle; credentials would be chained and kept, so that missing intermediate versions would not be a problem. Ideally the signature would be valid for the unpacked directory with the same ignores as .gitignore, not just for the specific compressed version of it, so that activity bundles could be recreated on the fly for sharing purposes. (I forget who's idea this is based on, apologies). (This may be overdesign, but the good part is that it keeps simple "I sign this bundle" separate from the whole maintainer/developer chain, so the simple part could be implemented first and remain unchanged later.)<br>
<br>-Any activity signed by the current user is reinstalled always (allows easy debug cycle and reverts)<br><br>-For now, develop would create its own key pair. When bitfrost's P_IDENT is implemented, it would use that.<br>
<br>(it may be that even when P_IDENT is implemented, it requires activities to include their own hash in all signed data: "signed by me using Develop activity" instead of just "signed by me". I suspect that this would not require any backwards-incompatible change to the signature format used)<br>
<br>Jameson<br>