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Git fetcher: Improve submodule handling

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Instead of making a complete copy of the repo, fetching the
submodules, and writing the result to the store (which is all
superexpensive), we now fetch the submodules recursively using the Git
fetcher, and return a union accessor that "mounts" the accessors for
the submodules on top of the root accessor.
This commit is contained in:
Eelco Dolstra 2023-10-27 18:39:00 +02:00
parent ee36a44bf2
commit d88106df24
6 changed files with 212 additions and 84 deletions
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8
tests/functional/fetchGitSubmodules.sh
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@ -118,11 +118,3 @@ cloneRepo=$TEST_ROOT/a/b/gitSubmodulesClone # NB /a/b to make the relative path
git clone $rootRepo $cloneRepo
pathIndirect=$(nix eval --raw --expr "(builtins.fetchGit { url = file://$cloneRepo; rev = \"$rev2\"; submodules = true; }).outPath")
[[ $pathIndirect = $pathWithRelative ]]
# Test that if the clone has the submodule already, we're not fetching
# it again.
git -C $cloneRepo submodule update --init
rm $TEST_HOME/.cache/nix/fetcher-cache*
rm -rf $subRepo
pathSubmoduleGone=$(nix eval --raw --expr "(builtins.fetchGit { url = file://$cloneRepo; rev = \"$rev2\"; submodules = true; }).outPath")
[[ $pathSubmoduleGone = $pathWithRelative ]]