lix/src/nix/command.cc

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#include "command.hh"
#include "store-api.hh"
#include "derivations.hh"
#include "nixexpr.hh"
namespace nix {
Commands * RegisterCommand::commands = nullptr;
StoreCommand::StoreCommand()
{
}
ref<Store> StoreCommand::getStore()
{
if (!_store)
_store = createStore();
return ref<Store>(_store);
}
ref<Store> StoreCommand::createStore()
{
return openStore();
}
void StoreCommand::run()
{
run(getStore());
}
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StorePathsCommand::StorePathsCommand(bool recursive)
: recursive(recursive)
{
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if (recursive)
mkFlag()
.longName("no-recursive")
.description("apply operation to specified paths only")
.set(&this->recursive, false);
else
mkFlag()
.longName("recursive")
.shortName('r')
.description("apply operation to closure of the specified paths")
.set(&this->recursive, true);
mkFlag(0, "all", "apply operation to the entire store", &all);
}
void StorePathsCommand::run(ref<Store> store)
{
StorePaths storePaths;
if (all) {
if (installables.size())
throw UsageError("'--all' does not expect arguments");
for (auto & p : store->queryAllValidPaths())
storePaths.push_back(p.clone());
}
else {
Allow content-addressable paths to have references This adds a command 'nix make-content-addressable' that rewrites the specified store paths into content-addressable paths. The advantage of such paths is that 1) they can be imported without signatures; 2) they can enable deduplication in cases where derivation changes do not cause output changes (apart from store path hashes). For example, $ nix make-content-addressable -r nixpkgs.cowsay rewrote '/nix/store/g1g31ah55xdia1jdqabv1imf6mcw0nb1-glibc-2.25-49' to '/nix/store/48jfj7bg78a8n4f2nhg269rgw1936vj4-glibc-2.25-49' ... rewrote '/nix/store/qbi6rzpk0bxjw8lw6azn2mc7ynnn455q-cowsay-3.03+dfsg1-16' to '/nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16' We can then copy the resulting closure to another store without signatures: $ nix copy --trusted-public-keys '' ---to ~/my-nix /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 In order to support self-references in content-addressable paths, these paths are hashed "modulo" self-references, meaning that self-references are zeroed out during hashing. Somewhat annoyingly, this means that the NAR hash stored in the Nix database is no longer necessarily equal to the output of "nix hash-path"; for content-addressable paths, you need to pass the --modulo flag: $ nix path-info --json /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 | jq -r .[].narHash sha256:0ri611gdilz2c9rsibqhsipbfs9vwcqvs811a52i2bnkhv7w9mgw $ nix hash-path --type sha256 --base32 /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 1ggznh07khq0hz6id09pqws3a8q9pn03ya3c03nwck1kwq8rclzs $ nix hash-path --type sha256 --base32 /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 --modulo iq6g2x4q62xp7y7493bibx0qn5w7xz67 0ri611gdilz2c9rsibqhsipbfs9vwcqvs811a52i2bnkhv7w9mgw
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for (auto & p : toStorePaths(store, realiseMode, installables))
storePaths.push_back(p.clone());
if (recursive) {
StorePathSet closure;
store->computeFSClosure(storePathsToSet(storePaths), closure, false, false);
storePaths.clear();
for (auto & p : closure)
storePaths.push_back(p.clone());
}
}
run(store, std::move(storePaths));
}
void StorePathCommand::run(ref<Store> store)
{
auto storePaths = toStorePaths(store, NoBuild, installables);
if (storePaths.size() != 1)
throw UsageError("this command requires exactly one store path");
run(store, *storePaths.begin());
}
Strings editorFor(const Pos & pos)
{
auto editor = getEnv("EDITOR").value_or("cat");
auto args = tokenizeString<Strings>(editor);
if (pos.line > 0 && (
editor.find("emacs") != std::string::npos ||
editor.find("nano") != std::string::npos ||
editor.find("vim") != std::string::npos))
args.push_back(fmt("+%d", pos.line));
args.push_back(pos.file);
return args;
}
}