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diff --git a/mcp/patches/README.md b/mcp/patches/README.md new file mode 100644 index 000000000..eab4d64e3 --- /dev/null +++ b/mcp/patches/README.md @@ -0,0 +1,103 @@ +Fuel@OPNFV submodule fetching and patching +========================================== + +This directory holds submodule fetching/patching scripts, intended for +working with upstream Fuel/MCP components (e.g.: reclass-system-salt-model) in +developing/applying OPNFV patches (backports, custom fixes etc.). + +The scripts should be friendly to the following 2 use-cases: + - development work: easily cloning, binding repos to specific commits, + remote tracking, patch development etc.; + - to provide parent build scripts an easy method of tracking upstream + references and applying OPNFV patches on top; + +Also, we need to support at least the following modes of operations: + - submodule bind - each submodule patches will be based on the commit ID + saved in the .gitmodules config file; + - remote tracking - each submodule will sync with the upstream remote + and patches will be applied on top of <sub_remote>/<sub_branch>/HEAD; + +Workflow (development) +---------------------- +The standard development workflow should look as follows: + +1. Decide whether remote tracking should be active or not: + NOTE: Setting the following var to any non-empty str enables remote track. + NOTE: Leaving unset will enable remote track for anything but stable branch. + + $ export FUEL_TRACK_REMOTES="" + +2. All Fuel sub-projects are registered as submodules. To initialize them, call: + If remote tracking is active, upstream remote is queried and latest remote + branch HEAD is fetched. Otherwise, checkout commit IDs from .gitmodules. + + $ make sub + +3. Apply patches from `patches/<sub-project>/*` to respective submodules via: + + $ make patches-import + + This will result in creation of: + - a tag called `${FUEL_MAIN_TAG}-opnfv-root` at the same commit as Fuel@OPNFV + upstream reference (bound to git submodule OR tracking remote HEAD); + - a new branch `opnfv-fuel` which will hold all the OPNFV patches, + each patch is applied on this new branch with `git-am`; + - a tag called `${FUEL_MAIN_TAG}-opnfv` at `opnfv-fuel/HEAD`; + +4. Modify sub-projects for whatever you need. + Commit your changes when you want them taken into account in the build. + +5. Re-create patches via: + + $ make patches-export + + Each commit on `opnfv-fuel` branch of each subproject will be + exported to `patches/subproject/` via `git format-patch`. + + NOTE: Only commit (-f) submodules when you need to bump upstream ref. + NOTE: DO NOT commit patched submodules! + +6. Clean workbench branches and tags with: + + $ make clean + +7. De-initialize submodules and force a clean clone with: + + $ make deepclean + +Sub-project maintenance +----------------------- +1. Adding a new submodule + If you need to add another subproject, you can do it with `git submodule`. + Make sure that you specify branch (with `-b`), short name (with `--name`): + + $ git submodule -b master add --name reclass-system-salt-model \ + https://github.com/Mirantis/reclass-system-salt-model \ + relative/path/to/submodule + +2. Working with remote tracking for upgrading Fuel components + Enable remote tracking as described above, which at `make sub` will update + ALL submodules (e.g. reclass-system-salt-model) to remote branch (set in + .gitmodules) HEAD. + + * If upstream has NOT already tagged a new version, we can still work on + our patches, make sure they apply etc., then check for new upstream + changes (and that our patches still apply on top of them) by: + + $ make deepclean patches-import + + * If upstream has already tagged a new version we want to pick up, checkout + the new tag in each submodule: + + $ git submodule foreach 'git checkout <newtag>' + + * Once satisfied with the patch and submodule changes, commit them: + - enforce FUEL_TRACK_REMOTES to "yes" if you want to constatly use the + latest remote branch HEAD (as soon as upstream pushes a change on that + branch, our next build will automatically include it - risk of our + patches colliding with new upstream changes); + - stage patch changes if any; + - if submodule tags have been updated (relevant when remote tracking is + disabled, i.e. we have a stable upstream baseline), add submodules: + + $ make deepclean sub && git add -f relative/path/to/submodule |