packaging: update dulwich to drop the certifi dependency on Windows The presence of `certifi` causes the system certificate store to be ignored, which was reported as a bug against TortoiseHg[1]. It was only pulled in on Windows because of `dulwich`, which was copied from the old TortoiseHg install scripts, in order to support `hg-git`. This version of `dulwich` raises the minimum `urllib3` to a version (1.25) that does certificate verification by default, without the help of `certifi`[2]. We already bundle a newer version of `urllib3`. Note that `certifi` can still be imported from the user site directory, if installed there. But the installer no longer disables the system certificates by default. [1] https://foss.heptapod.net/mercurial/tortoisehg/thg/-/issues/5825 [2] https://github.com/jelmer/dulwich/issues/1025

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Test null revisions (node 0000000000000000000000000000000000000000, aka rev -1)

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in various circumstances.

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Make an empty repo:

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  $ hg init a

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  $ cd a

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  $ hg files -r 0000000000000000000000000000000000000000

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  [1]

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  $ hg files -r .

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  [1]

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Add an empty commit (this makes the changelog refer to a null manifest node):

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  $ hg commit -m "init" --config ui.allowemptycommit=true

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  $ hg files -r .

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  [1]

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Strip that empty commit (this makes the changelog file empty, as opposed to missing):

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  $ hg --config 'extensions.strip=' strip . > /dev/null

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  $ hg files -r .

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  [1]