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Add traces to errors while updating flake lock file

Browse source 
Example:

$ nix build --show-trace
error: unable to download 'https://api.github.com/repos/NixOS/nixpkgs/commits/no-such-branch': HTTP error 422 ('')

       response body:

       {
         "message": "No commit found for SHA: no-such-branch",
         "documentation_url": "https://docs.github.com/rest/reference/repos#get-a-commit"
       }

       … while fetching the input 'github:NixOS/nixpkgs/no-such-branch'

       … while updating the flake input 'nixpkgs'

       … while updating the lock file of flake 'git+file:///home/eelco/Dev/nix'
This commit is contained in:
Eelco Dolstra 2021-01-27 14:02:54 +01:00
parent 8e758d402b
commit c03f41055d
2 changed files with 252 additions and 231 deletions
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14
src/libexpr/flake/flake.cc
View file

@ -298,6 +298,8 @@ LockedFlake lockFlake(
auto flake = getFlake(state, topRef, lockFlags.useRegistries, flakeCache);
try {
// FIXME: symlink attack
auto oldLockFile = LockFile::read(
flake.sourceInfo->actualPath + "/" + flake.lockedRef.subdir + "/flake.lock");
@ -351,6 +353,8 @@ LockedFlake lockFlake(
auto inputPathS = printInputPath(inputPath);
debug("computing input '%s'", inputPathS);
try {
/* Do we have an override for this input from one of the
ancestors? */
auto i = overrides.find(inputPath);
@ -490,6 +494,11 @@ LockedFlake lockFlake(
std::make_shared<LockedNode>(lockedRef, *input.ref, false));
}
}
} catch (Error & e) {
e.addTrace({}, "while updating the flake input '%s'", inputPathS);
throw;
}
}
};
@ -576,6 +585,11 @@ LockedFlake lockFlake(
}
return LockedFlake { .flake = std::move(flake), .lockFile = std::move(newLockFile) };
} catch (Error & e) {
e.addTrace({}, "while updating the lock file of flake '%s'", flake.lockedRef.to_string());
throw;
}
}
void callFlake(EvalState & state,

9
src/libfetchers/fetchers.cc
View file

@ -132,7 +132,14 @@ std::pair<Tree, Input> Input::fetch(ref<Store> store) const
}
}
auto [tree, input] = scheme->fetch(store, *this);
auto [tree, input] = [&]() -> std::pair<Tree, Input> {
try {
return scheme->fetch(store, *this);
} catch (Error & e) {
e.addTrace({}, "while fetching the input '%s'", to_string());
throw;
}
}();
if (tree.actualPath == "")
tree.actualPath = store->toRealPath(tree.storePath);