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fetchGit: fix submodule corner case by fetching all refs from cacheDir

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Due to fetchGit not checking if rev is an ancestor of ref (there is even
a FIXME comment about it in the code), the cache repo might not have the
ref even though it has the rev. This doesn't matter when submodule =
false, but the submodule = true code blows up because it tries to fetch
the (missing) ref from the cache repo.

Fix this in the simplest way possible: fetch all refs from the local
cache repo when submodules = true.

TODO: Add tests.
This commit is contained in:
Bjørn Forsman 2020-03-20 14:36:10 +01:00 committed by Julian Stecklina
parent cc522d0d23
commit f686efeed4
1 changed files with 4 additions and 1 deletions
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5
src/libexpr/primops/fetchGit.cc
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@ -183,8 +183,11 @@ GitInfo exportGit(ref<Store> store, const std::string & uri,
AutoDelete delTmpGitDir(tmpGitDir, true);
runProgram("git", true, { "init", tmpDir, "--separate-git-dir", tmpGitDir });
// TODO: the cacheDir repo might lack the ref (it only checks if rev
// exists, see FIXME above) so use a big hammer and fetch everything to
// ensure we get the rev.
runProgram("git", true, { "-C", tmpDir, "fetch", "--quiet", "--force",
"--", cacheDir, fmt("%s", *ref) });
"--update-head-ok", "--", cacheDir, "refs/*:refs/*" });
runProgram("git", true, { "-C", tmpDir, "checkout", "--quiet", gitInfo.rev });
runProgram("git", true, { "-C", tmpDir, "remote", "add", "origin", uri });