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Fix the printing of the installables on nix profile install conflict

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- If the element comes from a flake, print the full flakeref (with the
  fragment part) and not just the reference to the flake itself
- If the element doesn't come from a flake, print its store path(s)

This is a bit too verbose, but has the advantages of being correct (and
not crashing), so it's strictly better than the previous situation

Fix https://github.com/NixOS/nix/issues/8284
This commit is contained in:
Théophane Hufschmitt 2023-05-16 11:37:45 +02:00
parent 3d144e778e
commit e997512523
2 changed files with 36 additions and 10 deletions
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33
src/nix/profile.cc
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@ -31,6 +31,11 @@ struct ProfileElementSource
std::tuple(originalRef.to_string(), attrPath, outputs) <
std::tuple(other.originalRef.to_string(), other.attrPath, other.outputs);
}
std::string to_string() const
{
return fmt("%s#%s%s", originalRef, attrPath, outputs.to_string());
}
};
const int defaultPriority = 5;
@ -45,13 +50,27 @@ struct ProfileElement
std::string identifier() const
{
if (source)
return fmt("%s#%s%s", source->originalRef, source->attrPath, source->outputs.to_string());
return source->to_string();
StringSet names;
for (auto & path : storePaths)
names.insert(DrvName(path.name()).name);
return concatStringsSep(", ", names);
}
/**
* Return a string representing an installable corresponding to the current
* element, either a flakeref or a plain store path
*/
std::set<std::string> toInstallables(Store & store)
{
if (source)
return {source->to_string()};
StringSet rawPaths;
for (auto & path : storePaths)
rawPaths.insert(store.printStorePath(path));
return rawPaths;
}
std::string versions() const
{
StringSet versions;
@ -363,10 +382,10 @@ struct CmdProfileInstall : InstallablesCommand, MixDefaultProfile
auto profileElement = *it;
for (auto & storePath : profileElement.storePaths) {
if (conflictError.fileA.starts_with(store->printStorePath(storePath))) {
return std::pair(conflictError.fileA, profileElement.source->originalRef);
return std::pair(conflictError.fileA, profileElement.toInstallables(*store));
}
if (conflictError.fileB.starts_with(store->printStorePath(storePath))) {
return std::pair(conflictError.fileB, profileElement.source->originalRef);
return std::pair(conflictError.fileB, profileElement.toInstallables(*store));
}
}
}
@ -375,9 +394,9 @@ struct CmdProfileInstall : InstallablesCommand, MixDefaultProfile
// There are 2 conflicting files. We need to find out which one is from the already installed package and
// which one is the package that is the new package that is being installed.
// The first matching package is the one that was already installed (original).
auto [originalConflictingFilePath, originalConflictingRef] = findRefByFilePath(manifest.elements.begin(), manifest.elements.end());
auto [originalConflictingFilePath, originalConflictingRefs] = findRefByFilePath(manifest.elements.begin(), manifest.elements.end());
// The last matching package is the one that was going to be installed (new).
auto [newConflictingFilePath, newConflictingRef] = findRefByFilePath(manifest.elements.rbegin(), manifest.elements.rend());
auto [newConflictingFilePath, newConflictingRefs] = findRefByFilePath(manifest.elements.rbegin(), manifest.elements.rend());
throw Error(
"An existing package already provides the following file:\n"
@ -403,8 +422,8 @@ struct CmdProfileInstall : InstallablesCommand, MixDefaultProfile
" nix profile install %4% --priority %7%\n",
originalConflictingFilePath,
newConflictingFilePath,
originalConflictingRef.to_string(),
newConflictingRef.to_string(),
concatStringsSep(" ", originalConflictingRefs),
concatStringsSep(" ", newConflictingRefs),
conflictError.priority,
conflictError.priority - 1,
conflictError.priority + 1