32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
## #write-types different types of write operations
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Git supplies enough information to the update hook to be able to distinguish
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several types of writes.
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The most common are:
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* `RW` -- create a ref or fast-forward push a ref. No rewinds or deletes.
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* `RW+` -- create, fast-forward push, rewind push, or delete a ref.
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Sometimes you want to allow people to push, but not *create* a ref. Or
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rewind, but not *delete* a ref. The `C` and `D` qualifiers help here.
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* When a rule specifies `RWC` or `RW+C`, then *rules that do NOT have the C
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qualifier will no longer permit **creating** a ref*.
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<font color="gray">Please do not confuse this with the standalone `C`
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permission that allows someone to [create][] a **repo**</font>
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* When a rule specifies `RWD` or `RW+D`, then *rules that do NOT have the D
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qualifier will no longer permit **deleting** a ref*.
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Note: These two can be combined, so you can have `RWCD` and `RW+CD` as well.
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One very rare need is to reject merge commits (a commit series that is not a
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straight line of commits). The `M` qualifier helps here:
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* When a rule has `M` appended to the permissions, *rules that do NOT have
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it will reject a commit sequence that contains a merge commit* (i.e., they
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only accept a straight line series of commits).
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