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Add command 'nix profile diff-closure'

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This shows all changes between generations of a profile. E.g.

  $ nix profile diff-closures --profile /nix/var/nix/profiles/system
  Generation 654 -> 655:
    nix: 2.4pre20200617_5d69bbf → 2.4pre20200701_6ff9aa8, +42.2 KiB

  Generation 655 -> 656:
    blender-bin: 2.83.0 → 2.83.1, -294.2 KiB

  Generation 656 -> 657:
    curl: 7.68.0 → 7.70.0, +19.1 KiB
    firmware-linux-nonfree: 2020-01-22 → 2020-05-19, +30827.7 KiB
    ibus: -21.8 KiB
    initrd-linux: 5.4.46 → 5.4.49
    ...
This commit is contained in:
Eelco Dolstra 2020-07-16 17:00:42 +02:00
parent 5517eee17e
commit 16c9f6762d
3 changed files with 104 additions and 45 deletions
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6
src/nix/command.hh
View file

@ -244,4 +244,10 @@ void completeFlakeRefWithFragment(
const Strings & defaultFlakeAttrPaths,
std::string_view prefix);
void printClosureDiff(
ref<Store> store,
const StorePath & beforePath,
const StorePath & afterPath,
std::string_view indent);
}

100
src/nix/diff-closures.cc
View file

@ -6,7 +6,7 @@
#include <regex>
using namespace nix;
namespace nix {
struct Info
{
@ -52,6 +52,60 @@ std::string showVersions(const std::set<std::string> & versions)
return concatStringsSep(", ", versions2);
}
void printClosureDiff(
ref<Store> store,
const StorePath & beforePath,
const StorePath & afterPath,
std::string_view indent)
{
auto beforeClosure = getClosureInfo(store, beforePath);
auto afterClosure = getClosureInfo(store, afterPath);
std::set<std::string> allNames;
for (auto & [name, _] : beforeClosure) allNames.insert(name);
for (auto & [name, _] : afterClosure) allNames.insert(name);
for (auto & name : allNames) {
auto & beforeVersions = beforeClosure[name];
auto & afterVersions = afterClosure[name];
auto totalSize = [&](const std::map<std::string, std::map<StorePath, Info>> & versions)
{
uint64_t sum = 0;
for (auto & [_, paths] : versions)
for (auto & [path, _] : paths)
sum += store->queryPathInfo(path)->narSize;
return sum;
};
auto beforeSize = totalSize(beforeVersions);
auto afterSize = totalSize(afterVersions);
auto sizeDelta = (int64_t) afterSize - (int64_t) beforeSize;
auto showDelta = abs(sizeDelta) >= 8 * 1024;
std::set<std::string> removed, unchanged;
for (auto & [version, _] : beforeVersions)
if (!afterVersions.count(version)) removed.insert(version); else unchanged.insert(version);
std::set<std::string> added;
for (auto & [version, _] : afterVersions)
if (!beforeVersions.count(version)) added.insert(version);
if (showDelta || !removed.empty() || !added.empty()) {
std::vector<std::string> items;
if (!removed.empty() || !added.empty())
items.push_back(fmt("%s → %s", showVersions(removed), showVersions(added)));
if (showDelta)
items.push_back(fmt("%s%+.1f KiB" ANSI_NORMAL, sizeDelta > 0 ? ANSI_RED : ANSI_GREEN, sizeDelta / 1024.0));
std::cout << fmt("%s%s: %s\n", indent, name, concatStringsSep(", ", items));
}
}
}
}
using namespace nix;
struct CmdDiffClosures : SourceExprCommand
{
std::string _before, _after;
@ -85,49 +139,7 @@ struct CmdDiffClosures : SourceExprCommand
auto beforePath = toStorePath(store, Realise::Outputs, operateOn, before);
auto after = parseInstallable(store, _after);
auto afterPath = toStorePath(store, Realise::Outputs, operateOn, after);
auto beforeClosure = getClosureInfo(store, beforePath);
auto afterClosure = getClosureInfo(store, afterPath);
std::set<std::string> allNames;
for (auto & [name, _] : beforeClosure) allNames.insert(name);
for (auto & [name, _] : afterClosure) allNames.insert(name);
for (auto & name : allNames) {
auto & beforeVersions = beforeClosure[name];
auto & afterVersions = afterClosure[name];
auto totalSize = [&](const std::map<std::string, std::map<StorePath, Info>> & versions)
{
uint64_t sum = 0;
for (auto & [_, paths] : versions)
for (auto & [path, _] : paths)
sum += store->queryPathInfo(path)->narSize;
return sum;
};
auto beforeSize = totalSize(beforeVersions);
auto afterSize = totalSize(afterVersions);
auto sizeDelta = (int64_t) afterSize - (int64_t) beforeSize;
auto showDelta = abs(sizeDelta) >= 8 * 1024;
std::set<std::string> removed, unchanged;
for (auto & [version, _] : beforeVersions)
if (!afterVersions.count(version)) removed.insert(version); else unchanged.insert(version);
std::set<std::string> added;
for (auto & [version, _] : afterVersions)
if (!beforeVersions.count(version)) added.insert(version);
if (showDelta || !removed.empty() || !added.empty()) {
std::vector<std::string> items;
if (!removed.empty() || !added.empty())
items.push_back(fmt("%s → %s", showVersions(removed), showVersions(added)));
if (showDelta)
items.push_back(fmt("%s%+.1f KiB" ANSI_NORMAL, sizeDelta > 0 ? ANSI_RED : ANSI_GREEN, sizeDelta / 1024.0));
std::cout << fmt("%s: %s\n", name, concatStringsSep(", ", items));
}
}
printClosureDiff(store, beforePath, afterPath, "");
}
};

43
src/nix/profile.cc
View file

@ -7,6 +7,7 @@
#include "builtins/buildenv.hh"
#include "flake/flakeref.hh"
#include "../nix-env/user-env.hh"
#include "profiles.hh"
#include <nlohmann/json.hpp>
#include <regex>
@ -394,6 +395,46 @@ struct CmdProfileInfo : virtual EvalCommand, virtual StoreCommand, MixDefaultPro
}
};
struct CmdProfileDiffClosures : virtual EvalCommand, virtual StoreCommand, MixDefaultProfile
{
std::string description() override
{
return "show the closure difference between each generation of a profile";
}
Examples examples() override
{
return {
Example{
"To show what changed between each generation of the NixOS system profile:",
"nix profile diff-closure --profile /nix/var/nix/profiles/system"
},
};
}
void run(ref<Store> store) override
{
auto [gens, curGen] = findGenerations(*profile);
std::optional<Generation> prevGen;
bool first = true;
for (auto & gen : gens) {
if (prevGen) {
if (!first) std::cout << "\n";
first = false;
std::cout << fmt("Generation %d -> %d:\n", prevGen->number, gen.number);
printClosureDiff(store,
store->followLinksToStorePath(prevGen->path),
store->followLinksToStorePath(gen.path),
" ");
}
prevGen = gen;
}
}
};
struct CmdProfile : virtual MultiCommand, virtual Command
{
CmdProfile()
@ -402,6 +443,7 @@ struct CmdProfile : virtual MultiCommand, virtual Command
{"remove", []() { return make_ref<CmdProfileRemove>(); }},
{"upgrade", []() { return make_ref<CmdProfileUpgrade>(); }},
{"info", []() { return make_ref<CmdProfileInfo>(); }},
{"diff-closures", []() { return make_ref<CmdProfileDiffClosures>(); }},
})
{ }
@ -425,4 +467,3 @@ struct CmdProfile : virtual MultiCommand, virtual Command
};
static auto r1 = registerCommand<CmdProfile>("profile");