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Merge pull request #10028 from DavHau/fetchTree-shallow-default

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fetchTree: shallow git fetching by default
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Eelco Dolstra 2024-06-03 16:02:34 +02:00 • committed by GitHub
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synopsis: "`fetchTree` now fetches git repositories shallowly by default"
prs: 10028
---
`builtins.fetchTree` now clones git repositories shallowly by default, which reduces network traffic and disk usage significantly in many cases.
Previously, the default behavior was to clone the full history of a specific tag or branch (eg. `ref`) and only afterwards extract the files of one specific revision.
From now on, the `ref` and `allRefs` arguments will be ignored, except if shallow cloning is disabled by setting `shallow = false`.
The defaults for `builtins.fetchGit` remain unchanged. Here, shallow cloning has to be enabled manually by passing `shallow = true`.