add support for the git option "index.skipHash"

[rggjan]

Here is the comparable implementation in another git library for adding support for the same feature: https://github.com/libgit2/libgit2/pull/6738/files

[jelmer]

Shouldn't this be checking the configuration flag?

[rggjan]

Shouldn't this be checking the configuration flag?

In libgit, they also don’t seem to check the configuration flig: https://github.com/libgit2/libgit2/pull/6738/files

It seems to me that the checksum is all 0 in the index if the client used to write that index had skipHash enabled, which is probaby independent of the flags set at the time when it is read by dulwich?

[jelmer]

This should probably use the ZERO_SHA constant

[jelmer]

Shouldn't this be checking the configuration flag?

In libgit, they also don’t seem to check the configuration flig: https://github.com/libgit2/libgit2/pull/6738/files

It seems to me that the checksum is all 0 in the index if the client used to write that index had skipHash enabled, which is probaby independent of the flags set at the time when it is read by dulwich?

They do set skipHash in the tests though: https://github.com/libgit2/libgit2/blob/913d4ea251366f006a5ced6ed1804acf973a6ce6/tests/resources/status_skiphash/.gitted/config#L8

[jelmer]

Actually, I guess this is okay - but can you perhaps add support for skipHash on the creation side? We've been trying to remove the testdata files, so I'd rather not add any more.