Rename requires -> inputs, provides -> outputs

Issue #2828.

8 files changed, 112 insertions, 111 deletions

diff --git a/doc/flakes/design.md b/doc/flakes/design.md
index ebc229b09..4f6524f83 100644
--- a/doc/flakes/design.md
+++ b/doc/flakes/design.md
@@ -103,12 +103,12 @@ module.
 
   # A list of flake references denoting the flakes that this flake
   # depends on. Nix will resolve and fetch these flakes and pass them
-  # as a function argument to `provides` below.
+  # as a function argument to `outputs` below.
   #
   # `flake:nixpkgs` denotes a flake named `nixpkgs` which is looked up
   # in the flake registry, or in `flake.lock` inside this flake, if it
   # exists.
-  requires = [ flake:nixpkgs ];
+  inputs = [ flake:nixpkgs ];
 
   # The stuff provided by this flake. Flakes can provide whatever they
   # want (convention over configuration), but some attributes have
@@ -117,9 +117,9 @@ module.
   # `nixosModules` is used by NixOS to automatically pull in the
   # modules provided by a flake.
   #
-  # `provides` takes a single argument named `deps` that contains
+  # `outputs` takes a single argument named `deps` that contains
   # the resolved set of flakes. (See below.)
-  provides = deps: {
+  outputs = deps: {
 
     # This is searched by `nix`, so something like `nix install
     # dwarffs.dwarffs` resolves to this `packages.dwarffs`.
@@ -168,7 +168,7 @@ Similarly, a minimal `flake.nix` for Nixpkgs:
 
   description = "A collection of packages for the Nix package manager";
 
-  provides = deps:
+  outputs = deps:
     let pkgs = import ./. {}; in
     {
       lib = import ./lib;
@@ -310,9 +310,9 @@ Example:
 ```
 
 
-## `provides`
+## `outputs`
 
-The flake attribute `provides` is a function that takes an argument
+The flake attribute `outputs` is a function that takes an argument
 named `deps` and returns a (mostly) arbitrary attrset of values. Some
 of the standard result attributes:
 
@@ -329,13 +329,13 @@ of the standard result attributes:
   we need to avoid a situation where `nixos-rebuild` needs to fetch
   its own `nixpkgs` just to do `evalModules`.)
 
-* `shell`: A specification of a development environment in some TBD
+* `devShell`: A specification of a development environment in some TBD
   format.
 
 The function argument `flakes` is an attrset that contains an
-attribute for each dependency specified in `requires`. (Should it
+attribute for each dependency specified in `inputs`. (Should it
 contain transitive dependencies? Probably not.) Each attribute is an
-attrset containing the `provides` of the dependency, in addition to
+attrset containing the `outputs` of the dependency, in addition to
 the following attributes:
 
 * `path`: The path to the flake's source code. Useful when you want to
@@ -366,13 +366,13 @@ It may be useful to pull in repositories that are not flakes
 (i.e. don't contain a `flake.nix`). This could be done in two ways:
 
 * Allow flakes not to have a `flake.nix` file, in which case it's a
-  flake with no requires and no provides. The downside of this
+  flake with no inputs and no outputs. The downside of this
   approach is that we can't detect accidental use of a non-flake
   repository. (Also, we need to conjure up an identifier somehow.)
 
 * Add a flake attribute to specifiy non-flake dependencies, e.g.
 
-  > nonFlakeRequires.foobar = github:foo/bar;
+  > nonFlakeInputs.foobar = github:foo/bar;
 
 
 ## Flake registry
@@ -454,7 +454,7 @@ The default installation source in `nix` is the `packages` from all
 flakes in the registry, that is:
 ```
 builtins.mapAttrs (flakeName: flakeInfo:
-  (getFlake flakeInfo.uri).${flakeName}.provides.packages or {})
+  (getFlake flakeInfo.uri).${flakeName}.outputs.packages or {})
   builtins.flakeRegistry
 ```
 (where `builtins.flakeRegistry` is the global registry with user
@@ -476,10 +476,11 @@ in the registry named `hello`.
 
 Maybe the command
 
-> nix shell
+> nix dev-shell
 
-should do something like use `provides.shell` to initialize the shell,
-but probably we should ditch `nix shell` / `nix-shell` for direnv.
+should do something like use `outputs.devShell` to initialize the
+shell, but probably we should ditch `nix shell` / `nix-shell` for
+direnv.
 
 
 ## Pure evaluation and caching
@@ -535,7 +536,7 @@ repositories.
 
 ```nix
 {
-  provides = flakes: {
+  outputs = flakes: {
     nixosSystems.default =
       flakes.nixpkgs.lib.evalModules {
         modules =
@@ -549,7 +550,7 @@ repositories.
       };
   };
 
-  requires =
+  inputs =
     [ "nixpkgs/nixos-18.09"
       "dwarffs"
       "hydra"
diff --git a/flake.lock b/flake.lock
index 965d038ce..b85571b61 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,10 +1,10 @@
 {
-    "nonFlakeRequires": {},
-    "requires": {
+    "inputs": {
         "nixpkgs": {
-            "contentHash": "sha256-vy2UmXQM66aS/Kn2tCtjt9RwxfBvV+nQVb5tJQFwi8E=",
-            "uri": "github:edolstra/nixpkgs/a4d896e89932e873c4117908d558db6210fa3b56"
+            "narHash": "sha256-rMiWaLXkhizEEMEeMDutUl0Y/c+VEjfjvMkvBwvuQJU=",
+            "uri": "github:edolstra/nixpkgs/eeeffd24cd7e407cfaa99e98cfbb8f93bf4cc033"
         }
     },
+    "nonFlakeInputs": {},
     "version": 1
 }
diff --git a/flake.nix b/flake.nix
index 20ad2bc7e..ab96d5c90 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,13 +5,13 @@
 
   epoch = 2019;
 
-  requires = [ "nixpkgs" ];
+  inputs = [ "nixpkgs" ];
 
-  provides = deps: rec {
+  outputs = inputs: rec {
 
     hydraJobs = import ./release.nix {
-      nix = deps.self;
-      nixpkgs = deps.nixpkgs;
+      nix = inputs.self;
+      nixpkgs = inputs.nixpkgs;
     };
 
     checks = {
@@ -29,7 +29,7 @@
     defaultPackage = packages.nix;
 
     devShell = import ./shell.nix {
-      nixpkgs = deps.nixpkgs;
+      nixpkgs = inputs.nixpkgs;
     };
   };
 }
diff --git a/src/libexpr/primops/flake.cc b/src/libexpr/primops/flake.cc
index 0d762f2a1..fdbdc83bc 100644
--- a/src/libexpr/primops/flake.cc
+++ b/src/libexpr/primops/flake.cc
@@ -56,21 +56,21 @@ LockFile::FlakeEntry readFlakeEntry(nlohmann::json json)
     if (!flakeRef.isImmutable())
         throw Error("cannot use mutable flake '%s' in pure mode", flakeRef);
 
-    LockFile::FlakeEntry entry(flakeRef, Hash((std::string) json["contentHash"]));
+    LockFile::FlakeEntry entry(flakeRef, Hash((std::string) json["narHash"]));
 
-    auto nonFlakeRequires = json["nonFlakeRequires"];
+    auto nonFlakeInputs = json["nonFlakeInputs"];
 
-    for (auto i = nonFlakeRequires.begin(); i != nonFlakeRequires.end(); ++i) {
+    for (auto i = nonFlakeInputs.begin(); i != nonFlakeInputs.end(); ++i) {
         FlakeRef flakeRef(i->value("uri", ""));
         if (!flakeRef.isImmutable())
             throw Error("requested to fetch FlakeRef '%s' purely, which is mutable", flakeRef);
-        LockFile::NonFlakeEntry nonEntry(flakeRef, Hash(i->value("contentHash", "")));
+        LockFile::NonFlakeEntry nonEntry(flakeRef, Hash(i->value("narHash", "")));
         entry.nonFlakeEntries.insert_or_assign(i.key(), nonEntry);
     }
 
-    auto requires = json["requires"];
+    auto inputs = json["inputs"];
 
-    for (auto i = requires.begin(); i != requires.end(); ++i)
+    for (auto i = inputs.begin(); i != inputs.end(); ++i)
         entry.flakeEntries.insert_or_assign(i.key(), readFlakeEntry(*i));
 
     return entry;
@@ -89,19 +89,19 @@ LockFile readLockFile(const Path & path)
     if (version != 1)
         throw Error("lock file '%s' has unsupported version %d", path, version);
 
-    auto nonFlakeRequires = json["nonFlakeRequires"];
+    auto nonFlakeInputs = json["nonFlakeInputs"];
 
-    for (auto i = nonFlakeRequires.begin(); i != nonFlakeRequires.end(); ++i) {
+    for (auto i = nonFlakeInputs.begin(); i != nonFlakeInputs.end(); ++i) {
         FlakeRef flakeRef(i->value("uri", ""));
-        LockFile::NonFlakeEntry nonEntry(flakeRef, Hash(i->value("contentHash", "")));
+        LockFile::NonFlakeEntry nonEntry(flakeRef, Hash(i->value("narHash", "")));
         if (!flakeRef.isImmutable())
             throw Error("found mutable FlakeRef '%s' in lockfile at path %s", flakeRef, path);
         lockFile.nonFlakeEntries.insert_or_assign(i.key(), nonEntry);
     }
 
-    auto requires = json["requires"];
+    auto inputs = json["inputs"];
 
-    for (auto i = requires.begin(); i != requires.end(); ++i)
+    for (auto i = inputs.begin(); i != inputs.end(); ++i)
         lockFile.flakeEntries.insert_or_assign(i.key(), readFlakeEntry(*i));
 
     return lockFile;
@@ -111,13 +111,13 @@ nlohmann::json flakeEntryToJson(const LockFile::FlakeEntry & entry)
 {
     nlohmann::json json;
     json["uri"] = entry.ref.to_string();
-    json["contentHash"] = entry.narHash.to_string(SRI);
+    json["narHash"] = entry.narHash.to_string(SRI);
     for (auto & x : entry.nonFlakeEntries) {
-        json["nonFlakeRequires"][x.first]["uri"] = x.second.ref.to_string();
-        json["nonFlakeRequires"][x.first]["contentHash"] = x.second.narHash.to_string(SRI);
+        json["nonFlakeInputs"][x.first]["uri"] = x.second.ref.to_string();
+        json["nonFlakeInputs"][x.first]["narHash"] = x.second.narHash.to_string(SRI);
     }
     for (auto & x : entry.flakeEntries)
-        json["requires"][x.first.to_string()] = flakeEntryToJson(x.second);
+        json["inputs"][x.first.to_string()] = flakeEntryToJson(x.second);
     return json;
 }
 
@@ -125,14 +125,14 @@ void writeLockFile(const LockFile & lockFile, const Path & path)
 {
     nlohmann::json json;
     json["version"] = 1;
-    json["nonFlakeRequires"] = nlohmann::json::object();
+    json["nonFlakeInputs"] = nlohmann::json::object();
     for (auto & x : lockFile.nonFlakeEntries) {
-        json["nonFlakeRequires"][x.first]["uri"] = x.second.ref.to_string();
-        json["nonFlakeRequires"][x.first]["contentHash"] = x.second.narHash.to_string(SRI);
+        json["nonFlakeInputs"][x.first]["uri"] = x.second.ref.to_string();
+        json["nonFlakeInputs"][x.first]["narHash"] = x.second.narHash.to_string(SRI);
     }
-    json["requires"] = nlohmann::json::object();
+    json["inputs"] = nlohmann::json::object();
     for (auto & x : lockFile.flakeEntries)
-        json["requires"][x.first.to_string()] = flakeEntryToJson(x.second);
+        json["inputs"][x.first.to_string()] = flakeEntryToJson(x.second);
     createDirs(dirOf(path));
     writeFile(path, json.dump(4) + "\n"); // '4' = indentation in json file
 }
@@ -319,41 +319,41 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowe
     if (auto description = vInfo.attrs->get(state.sDescription))
         flake.description = state.forceStringNoCtx(*(**description).value, *(**description).pos);
 
-    auto sRequires = state.symbols.create("requires");
+    auto sInputs = state.symbols.create("inputs");
 
-    if (auto requires = vInfo.attrs->get(sRequires)) {
-        state.forceList(*(**requires).value, *(**requires).pos);
-        for (unsigned int n = 0; n < (**requires).value->listSize(); ++n)
-            flake.requires.push_back(FlakeRef(state.forceStringNoCtx(
-                *(**requires).value->listElems()[n], *(**requires).pos)));
+    if (auto inputs = vInfo.attrs->get(sInputs)) {
+        state.forceList(*(**inputs).value, *(**inputs).pos);
+        for (unsigned int n = 0; n < (**inputs).value->listSize(); ++n)
+            flake.inputs.push_back(FlakeRef(state.forceStringNoCtx(
+                *(**inputs).value->listElems()[n], *(**inputs).pos)));
     }
 
-    auto sNonFlakeRequires = state.symbols.create("nonFlakeRequires");
+    auto sNonFlakeInputs = state.symbols.create("nonFlakeInputs");
 
-    if (std::optional<Attr *> nonFlakeRequires = vInfo.attrs->get(sNonFlakeRequires)) {
-        state.forceAttrs(*(**nonFlakeRequires).value, *(**nonFlakeRequires).pos);
-        for (Attr attr : *(*(**nonFlakeRequires).value).attrs) {
+    if (std::optional<Attr *> nonFlakeInputs = vInfo.attrs->get(sNonFlakeInputs)) {
+        state.forceAttrs(*(**nonFlakeInputs).value, *(**nonFlakeInputs).pos);
+        for (Attr attr : *(*(**nonFlakeInputs).value).attrs) {
             std::string myNonFlakeUri = state.forceStringNoCtx(*attr.value, *attr.pos);
             FlakeRef nonFlakeRef = FlakeRef(myNonFlakeUri);
-            flake.nonFlakeRequires.insert_or_assign(attr.name, nonFlakeRef);
+            flake.nonFlakeInputs.insert_or_assign(attr.name, nonFlakeRef);
         }
     }
 
-    auto sProvides = state.symbols.create("provides");
+    auto sOutputs = state.symbols.create("outputs");
 
-    if (auto provides = vInfo.attrs->get(sProvides)) {
-        state.forceFunction(*(**provides).value, *(**provides).pos);
-        flake.vProvides = (**provides).value;
+    if (auto outputs = vInfo.attrs->get(sOutputs)) {
+        state.forceFunction(*(**outputs).value, *(**outputs).pos);
+        flake.vOutputs = (**outputs).value;
     } else
-        throw Error("flake '%s' lacks attribute 'provides'", flakeRef);
+        throw Error("flake '%s' lacks attribute 'outputs'", flakeRef);
 
     for (auto & attr : *vInfo.attrs) {
         if (attr.name != sEpoch &&
             attr.name != state.sName &&
             attr.name != state.sDescription &&
-            attr.name != sRequires &&
-            attr.name != sNonFlakeRequires &&
-            attr.name != sProvides)
+            attr.name != sInputs &&
+            attr.name != sNonFlakeInputs &&
+            attr.name != sOutputs)
             throw Error("flake '%s' has an unsupported attribute '%s', at %s",
                 flakeRef, attr.name, *attr.pos);
     }
@@ -436,7 +436,7 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
 
     ResolvedFlake deps(flake);
 
-    for (auto & nonFlakeInfo : flake.nonFlakeRequires) {
+    for (auto & nonFlakeInfo : flake.nonFlakeInputs) {
         FlakeRef ref = nonFlakeInfo.second;
         auto i = lockFile.nonFlakeEntries.find(nonFlakeInfo.first);
         if (i != lockFile.nonFlakeEntries.end()) {
@@ -451,7 +451,7 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
         }
     }
 
-    for (auto newFlakeRef : flake.requires) {
+    for (auto newFlakeRef : flake.inputs) {
         auto i = lockFile.flakeEntries.find(newFlakeRef);
         if (i != lockFile.flakeEntries.end()) { // Propagate lockFile downwards if possible
             ResolvedFlake newResFlake = resolveFlakeFromLockFile(state, i->second.ref, handleLockFile, entryToLockFile(i->second));
@@ -532,8 +532,8 @@ static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo
 
 void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)
 {
-    // Construct the resulting attrset '{description, provides,
-    // ...}'. This attrset is passed lazily as an argument to 'provides'.
+    // Construct the resulting attrset '{description, outputs,
+    // ...}'. This attrset is passed lazily as an argument to 'outputs'.
 
     state.mkAttrs(v, resFlake.flakeDeps.size() + resFlake.nonFlakeDeps.size() + 8);
 
@@ -558,8 +558,8 @@ void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)
 
     emitSourceInfoAttrs(state, resFlake.flake.sourceInfo, v);
 
-    auto vProvides = state.allocAttr(v, state.symbols.create("provides"));
-    mkApp(*vProvides, *resFlake.flake.vProvides, v);
+    auto vOutputs = state.allocAttr(v, state.symbols.create("outputs"));
+    mkApp(*vOutputs, *resFlake.flake.vOutputs, v);
 
     v.attrs->push_back(Attr(state.symbols.create("self"), &v));
 
diff --git a/src/libexpr/primops/flake.hh b/src/libexpr/primops/flake.hh
index 340b97c65..82b0973f6 100644
--- a/src/libexpr/primops/flake.hh
+++ b/src/libexpr/primops/flake.hh
@@ -106,9 +106,9 @@ struct Flake
     FlakeRef originalRef;
     std::string description;
     SourceInfo sourceInfo;
-    std::vector<FlakeRef> requires;
-    std::map<FlakeAlias, FlakeRef> nonFlakeRequires;
-    Value * vProvides; // FIXME: gc
+    std::vector<FlakeRef> inputs;
+    std::map<FlakeAlias, FlakeRef> nonFlakeInputs;
+    Value * vOutputs; // FIXME: gc
     unsigned int epoch;
 
     Flake(const FlakeRef & origRef, const SourceInfo & sourceInfo)
diff --git a/src/nix/flake.cc b/src/nix/flake.cc
index 872ec2849..8d6716391 100644
--- a/src/nix/flake.cc
+++ b/src/nix/flake.cc
@@ -199,16 +199,16 @@ struct CmdFlakeUpdate : FlakeCommand
     }
 };
 
-static void enumerateProvides(EvalState & state, Value & vFlake,
+static void enumerateOutputs(EvalState & state, Value & vFlake,
     std::function<void(const std::string & name, Value & vProvide)> callback)
 {
     state.forceAttrs(vFlake);
 
-    auto vProvides = (*vFlake.attrs->get(state.symbols.create("provides")))->value;
+    auto vOutputs = (*vFlake.attrs->get(state.symbols.create("outputs")))->value;
 
-    state.forceAttrs(*vProvides);
+    state.forceAttrs(*vOutputs);
 
-    for (auto & attr : *vProvides->attrs)
+    for (auto & attr : *vOutputs->attrs)
         callback(attr.name, *attr.value);
 }
 
@@ -237,9 +237,9 @@ struct CmdFlakeInfo : FlakeCommand, MixJSON
             auto vFlake = state->allocValue();
             flake::callFlake(*state, flake, *vFlake);
 
-            auto provides = nlohmann::json::object();
+            auto outputs = nlohmann::json::object();
 
-            enumerateProvides(*state,
+            enumerateOutputs(*state,
                 *vFlake,
                 [&](const std::string & name, Value & vProvide) {
                     auto provide = nlohmann::json::object();
@@ -250,10 +250,10 @@ struct CmdFlakeInfo : FlakeCommand, MixJSON
                             provide[aCheck.name] = nlohmann::json::object();
                     }
 
-                    provides[name] = provide;
+                    outputs[name] = provide;
                 });
 
-            json["provides"] = std::move(provides);
+            json["outputs"] = std::move(outputs);
 
             std::cout << json.dump() << std::endl;
         } else
@@ -298,7 +298,7 @@ struct CmdFlakeCheck : FlakeCommand, MixJSON
                 // FIXME: check meta attributes
                 return drvInfo->queryDrvPath();
             } catch (Error & e) {
-                e.addPrefix(fmt("while checking flake attribute '" ANSI_BOLD "%s" ANSI_NORMAL "':\n", attrPath));
+                e.addPrefix(fmt("while checking flake output attribute '" ANSI_BOLD "%s" ANSI_NORMAL "':\n", attrPath));
                 throw;
             }
         };
@@ -311,7 +311,7 @@ struct CmdFlakeCheck : FlakeCommand, MixJSON
             auto vFlake = state->allocValue();
             flake::callFlake(*state, flake, *vFlake);
 
-            enumerateProvides(*state,
+            enumerateOutputs(*state,
                 *vFlake,
                 [&](const std::string & name, Value & vProvide) {
                     Activity act(*logger, lvlChatty, actUnknown,
diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index ea12cd79c..fe89a6bb4 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -230,16 +230,16 @@ struct InstallableFlake : InstallableValue
 
         makeFlakeClosureGCRoot(*state.store, flakeRef, resFlake);
 
-        auto vProvides = (*vFlake->attrs->get(state.symbols.create("provides")))->value;
+        auto vOutputs = (*vFlake->attrs->get(state.symbols.create("outputs")))->value;
 
-        state.forceValue(*vProvides);
+        state.forceValue(*vOutputs);
 
         auto emptyArgs = state.allocBindings(0);
 
         if (searchPackages) {
             // As a convenience, look for the attribute in
-            // 'provides.packages'.
-            if (auto aPackages = *vProvides->attrs->get(state.symbols.create("packages"))) {
+            // 'outputs.packages'.
+            if (auto aPackages = *vOutputs->attrs->get(state.symbols.create("packages"))) {
                 try {
                     auto * v = findAlongAttrPath(state, *attrPaths.begin(), *emptyArgs, *aPackages->value);
                     state.forceValue(*v);
@@ -250,7 +250,7 @@ struct InstallableFlake : InstallableValue
 
             // As a temporary hack until Nixpkgs is properly converted
             // to provide a clean 'packages' set, look in 'legacyPackages'.
-            if (auto aPackages = *vProvides->attrs->get(state.symbols.create("legacyPackages"))) {
+            if (auto aPackages = *vOutputs->attrs->get(state.symbols.create("legacyPackages"))) {
                 try {
                     auto * v = findAlongAttrPath(state, *attrPaths.begin(), *emptyArgs, *aPackages->value);
                     state.forceValue(*v);
@@ -260,10 +260,10 @@ struct InstallableFlake : InstallableValue
             }
         }
 
-        // Otherwise, look for it in 'provides'.
+        // Otherwise, look for it in 'outputs'.
         for (auto & attrPath : attrPaths) {
             try {
-                auto * v = findAlongAttrPath(state, attrPath, *emptyArgs, *vProvides);
+                auto * v = findAlongAttrPath(state, attrPath, *emptyArgs, *vOutputs);
                 state.forceValue(*v);
                 return v;
             } catch (AttrPathNotFound & e) {
diff --git a/tests/flakes.sh b/tests/flakes.sh
index d95d34c76..377f93c8e 100644
--- a/tests/flakes.sh
+++ b/tests/flakes.sh
@@ -33,7 +33,7 @@ cat > $flake1Dir/flake.nix <<EOF
 
   description = "Bla bla";
 
-  provides = deps: rec {
+  outputs = inputs: rec {
     packages.foo = import ./simple.nix;
     defaultPackage = packages.foo;
   };
@@ -50,12 +50,12 @@ cat > $flake2Dir/flake.nix <<EOF
 
   epoch = 2019;
 
-  requires = [ "flake1" ];
+  inputs = [ "flake1" ];
 
   description = "Fnord";
 
-  provides = deps: rec {
-    packages.bar = deps.flake1.provides.packages.foo;
+  outputs = inputs: rec {
+    packages.bar = inputs.flake1.outputs.packages.foo;
   };
 }
 EOF
@@ -69,12 +69,12 @@ cat > $flake3Dir/flake.nix <<EOF
 
   epoch = 2019;
 
-  requires = [ "flake2" ];
+  inputs = [ "flake2" ];
 
   description = "Fnord";
 
-  provides = deps: rec {
-    packages.xyzzy = deps.flake2.provides.packages.bar;
+  outputs = inputs: rec {
+    packages.xyzzy = inputs.flake2.outputs.packages.bar;
   };
 }
 EOF
@@ -168,13 +168,13 @@ cat > $flake3Dir/flake.nix <<EOF
 
   epoch = 2019;
 
-  requires = [ "flake1" "flake2" ];
+  inputs = [ "flake1" "flake2" ];
 
   description = "Fnord";
 
-  provides = deps: rec {
-    packages.xyzzy = deps.flake2.provides.packages.bar;
-    packages.sth = deps.flake1.provides.packages.foo;
+  outputs = inputs: rec {
+    packages.xyzzy = inputs.flake2.outputs.packages.bar;
+    packages.sth = inputs.flake1.outputs.packages.foo;
   };
 }
 EOF
@@ -209,7 +209,7 @@ nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2D
 mv $flake1Dir.tmp $flake1Dir
 mv $flake2Dir.tmp $flake2Dir
 
-# Add nonFlakeRequires to flake3.
+# Add nonFlakeInputs to flake3.
 rm $flake3Dir/flake.nix
 
 cat > $flake3Dir/flake.nix <<EOF
@@ -218,23 +218,23 @@ cat > $flake3Dir/flake.nix <<EOF
 
   epoch = 2019;
 
-  requires = [ "flake1" "flake2" ];
+  inputs = [ "flake1" "flake2" ];
 
-  nonFlakeRequires = {
+  nonFlakeInputs = {
     nonFlake = "$nonFlakeDir";
   };
 
   description = "Fnord";
 
-  provides = deps: rec {
-    packages.xyzzy = deps.flake2.provides.packages.bar;
-    packages.sth = deps.flake1.provides.packages.foo;
+  outputs = inputs: rec {
+    packages.xyzzy = inputs.flake2.outputs.packages.bar;
+    packages.sth = inputs.flake1.outputs.packages.foo;
   };
 }
 EOF
 
 git -C $flake3Dir add flake.nix
-git -C $flake3Dir commit -m 'Add nonFlakeRequires'
+git -C $flake3Dir commit -m 'Add nonFlakeInputs'
 
-# Check whether `nix build` works with a lockfile which is missing a nonFlakeRequires
+# Check whether `nix build` works with a lockfile which is missing a nonFlakeInputs
 nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth