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add document: how to make a patch for export-diff cmd #117

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add document: how to make a patch for export-diff cmd #117

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20 changes: 17 additions & 3 deletions ceph/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,7 @@ make test

## Procedure to update
### Update ceph version

Imports all of the contents from upstream git, including tags.
**In the `cybozu/ceph` repository,** imports all of the contents from upstream git, including tags.

```sh
git swtich main
Expand All @@ -29,9 +28,24 @@ git push origin --tags
```

### Update the patch
TBD
**In the `cybozu/ceph` repository,** the export-diff patch is created by each target Ceph version. A branch is created for each Ceph version. If there is no branch for the target version, You can create it like the following.

```sh
# at working directory for https://github.com/ceph/ceph.git
VERSION=16.2.4
git checkout -b rbd-export-v$VERSION tags/v$VERSION
```

You commit & push to the branch in the same way as normal development, but **you do not create an RP, and do not merge to the main branch.** You simply save the changes to the branch.

```sh
git diff tags/v$VERSION > export-diff.patch
```

The patches are stored in the `ceph` directory in the `cybozu-go/mantle` repository. Please copy them manually.

### Release
**Works in the `cybozu-go/mantle` repository.**

1. The version is determined. The patch version is the same as the base ceph version. The fourth field starts at 0 for each ceph version and increases by 1 for each release.
```sh
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