diff --git a/crate2nix/Cargo.nix b/crate2nix/Cargo.nix
index cfdb08c8..3b0647d7 100644
--- a/crate2nix/Cargo.nix
+++ b/crate2nix/Cargo.nix
@@ -4,10 +4,16 @@
 # See https://github.com/kolloch/crate2nix for more info.
 
 { nixpkgs ? ../nix/nixpkgs.nix
-, pkgs ? import nixpkgs { config = {}; }
+, pkgs ? import nixpkgs { }
 , fetchurl ? pkgs.fetchurl
+, fetchgit ? pkgs.fetchgit
+, callPackage ? pkgs.callPackage
 , lib ? pkgs.lib
+, buildPackages ? pkgs.buildPackages
 , stdenv ? pkgs.stdenv
+, stdenvNoCC ? pkgs.stdenvNoCC
+, symlinkJoin ? pkgs.symlinkJoin
+, runCommand ? pkgs.runCommand
 , buildRustCrateForPkgs ? pkgs: pkgs.buildRustCrate
   # This is used as the `crateOverrides` argument for `buildRustCrate`.
 , defaultCrateOverrides ? pkgs.defaultCrateOverrides
@@ -24,7 +30,7 @@
   # Additional crate2nix configuration if it exists.
 , crateConfig
   ? if builtins.pathExists ./crate-config.nix
-    then pkgs.callPackage ./crate-config.nix {}
+    then callPackage ./crate-config.nix {}
     else {}
 }:
 
@@ -65,7 +71,7 @@ rec {
 
 
   # A derivation that joins the outputs of all workspace members together.
-  allWorkspaceMembers = pkgs.symlinkJoin {
+  allWorkspaceMembers = symlinkJoin {
       name = "all-workspace-members";
       paths =
         let members = builtins.attrValues workspaceMembers;
@@ -3286,15 +3292,15 @@ rec {
             # If the user hasn't set any pre/post commands, we don't want to
             # insert empty lines. This means that any existing users of crate2nix
             # don't get a spurious rebuild unless they set these explicitly.
-            testCommand = pkgs.lib.concatStringsSep "\n" (
-              pkgs.lib.filter (s: s != "") [
+            testCommand = lib.concatStringsSep "\n" (
+              lib.filter (s: s != "") [
                 testPreRun
                 "$f $testCrateFlags 2>&1 | tee -a $out"
                 testPostRun
               ]
             );
           in
-          pkgs.stdenvNoCC.mkDerivation {
+          stdenvNoCC.mkDerivation {
             name = "run-tests-${testCrate.name}";
 
             inherit (crate) src;
@@ -3330,7 +3336,7 @@ rec {
             '';
           };
       in
-      pkgs.runCommand "${crate.name}-linked"
+      runCommand "${crate.name}-linked"
         {
           inherit (crate) outputs crateName;
           passthru = (crate.passthru or { }) // {
@@ -3469,7 +3475,7 @@ rec {
                 )
                 crateConfigs;
               target = makeTarget stdenv.hostPlatform;
-              build = mkBuiltByPackageIdByPkgs pkgs.buildPackages;
+              build = mkBuiltByPackageIdByPkgs buildPackages;
             };
           in
           self;
@@ -3544,7 +3550,7 @@ rec {
             crateConfig
             // {
               src =
-                crateConfig.src or (pkgs.fetchurl rec {
+                crateConfig.src or (fetchurl rec {
                   name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
                   # https://www.pietroalbini.org/blog/downloading-crates-io/
                   # Not rate-limited, CDN URL.
diff --git a/crate2nix/templates/Cargo.nix.tera b/crate2nix/templates/Cargo.nix.tera
index 980d5032..29b3f8b0 100644
--- a/crate2nix/templates/Cargo.nix.tera
+++ b/crate2nix/templates/Cargo.nix.tera
@@ -6,10 +6,16 @@
 # See https://github.com/kolloch/crate2nix for more info.
 
 { nixpkgs ? {{config.nixpkgs_path | safe}}
-, pkgs ? import nixpkgs { config = {}; }
+, pkgs ? import nixpkgs { }
 , fetchurl ? pkgs.fetchurl
+, fetchgit ? pkgs.fetchgit
+, callPackage ? pkgs.callPackage
 , lib ? pkgs.lib
+, buildPackages ? pkgs.buildPackages
 , stdenv ? pkgs.stdenv
+, stdenvNoCC ? pkgs.stdenvNoCC
+, symlinkJoin ? pkgs.symlinkJoin
+, runCommand ? pkgs.runCommand
 , buildRustCrateForPkgs ? pkgs: pkgs.buildRustCrate
   # This is used as the `crateOverrides` argument for `buildRustCrate`.
 , defaultCrateOverrides ? pkgs.defaultCrateOverrides
@@ -26,7 +32,7 @@
   # Additional crate2nix configuration if it exists.
 , crateConfig
   ? if builtins.pathExists ./crate-config.nix
-    then pkgs.callPackage ./crate-config.nix {}
+    then callPackage ./crate-config.nix {}
     else {}
 }:
 
@@ -74,7 +80,7 @@ rec {
   registries = {
   {%- for name, hash in registries %}
     {{name}} = builtins.fromJSON (builtins.readFile (fetchurl {
-      url = "{{name | safe}}/config.json";
+      url = "{{name | trim_end_matches(pat="/") | safe}}/config.json";
       sha256 = {{hash}};
     }));
   {%- endfor %}
@@ -82,7 +88,7 @@ rec {
   {%- endif %}
 
   # A derivation that joins the outputs of all workspace members together.
-  allWorkspaceMembers = pkgs.symlinkJoin {
+  allWorkspaceMembers = symlinkJoin {
       name = "all-workspace-members";
       paths =
         let members = builtins.attrValues workspaceMembers;
@@ -147,16 +153,16 @@ rec {
         {%- elif crate.source.Nix.file.import and crate.source.Nix.attr %}
         src = (import {{crate.source.Nix.file.import | safe}}).{{crate.source.Nix.attr | safe}};
         {%- elif crate.source.Nix.file.package and crate.source.Nix.attr %}
-        src = (pkgs.callPackage {{crate.source.Nix.file.package | safe}} {}).{{crate.source.Nix.attr | safe}};
+        src = (callPackage {{crate.source.Nix.file.package | safe}} {}).{{crate.source.Nix.attr | safe}};
         {%- elif crate.source.Nix.file.import %}
         src = import {{crate.source.Nix.file.import | safe}};
         {%- elif crate.source.Nix.file.package %}
-        src = pkgs.callPackage {{crate.source.Nix.file.package | safe}} {};
+        src = callPackage {{crate.source.Nix.file.package | safe}} {};
         {%- elif crate.source.LocalDirectory.path %}
         src = lib.cleanSourceWith { filter = sourceFilter;  src = {{crate.source.LocalDirectory.path | safe}}; };
         {%- elif crate.source.Git %}
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = {{crate.source.Git.url}};
           rev = {{crate.source.Git.rev}};
           {%- if crate.source.Git.sha256 %}
diff --git a/crate2nix/templates/nix/crate2nix/default.nix b/crate2nix/templates/nix/crate2nix/default.nix
index 3e088032..f098e033 100644
--- a/crate2nix/templates/nix/crate2nix/default.nix
+++ b/crate2nix/templates/nix/crate2nix/default.nix
@@ -1,15 +1,19 @@
 #
 # crate2nix/default.nix (excerpt start)
 #{#
-{ pkgs
-, lib
+{ lib
+, pkgs
 , stdenv
+, stdenvNoCC
 , buildRustCrate
 , buildRustCrateForPkgs ? if buildRustCrate != null then
     lib.warn "`buildRustCrate` is deprecated, use `buildRustCrateForPkgs` instead" (_: buildRustCrate)
   else
     pkgs: pkgs.buildRustCrate
+, buildPackages
 , defaultCrateOverrides
+, fetchurl
+, runCommand
 , strictDeprecation ? true
 , crates ? { }
 , rootFeatures ? [ ]
@@ -157,15 +161,15 @@ rec {
             # If the user hasn't set any pre/post commands, we don't want to
             # insert empty lines. This means that any existing users of crate2nix
             # don't get a spurious rebuild unless they set these explicitly.
-            testCommand = pkgs.lib.concatStringsSep "\n" (
-              pkgs.lib.filter (s: s != "") [
+            testCommand = lib.concatStringsSep "\n" (
+              lib.filter (s: s != "") [
                 testPreRun
                 "$f $testCrateFlags 2>&1 | tee -a $out"
                 testPostRun
               ]
             );
           in
-          pkgs.stdenvNoCC.mkDerivation {
+          stdenvNoCC.mkDerivation {
             name = "run-tests-${testCrate.name}";
 
             inherit (crate) src;
@@ -201,7 +205,7 @@ rec {
             '';
           };
       in
-      pkgs.runCommand "${crate.name}-linked"
+      runCommand "${crate.name}-linked"
         {
           inherit (crate) outputs crateName;
           passthru = (crate.passthru or { }) // {
@@ -340,7 +344,7 @@ rec {
                 )
                 crateConfigs;
               target = makeTarget stdenv.hostPlatform;
-              build = mkBuiltByPackageIdByPkgs pkgs.buildPackages;
+              build = mkBuiltByPackageIdByPkgs buildPackages;
             };
           in
           self;
@@ -415,7 +419,7 @@ rec {
             crateConfig
             // {
               src =
-                crateConfig.src or (pkgs.fetchurl rec {
+                crateConfig.src or (fetchurl rec {
                   name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
                   # https://www.pietroalbini.org/blog/downloading-crates-io/
                   # Not rate-limited, CDN URL.
diff --git a/sample_projects/bin_with_git_submodule_dep/Cargo.nix b/sample_projects/bin_with_git_submodule_dep/Cargo.nix
index 34060349..4dd57a6c 100644
--- a/sample_projects/bin_with_git_submodule_dep/Cargo.nix
+++ b/sample_projects/bin_with_git_submodule_dep/Cargo.nix
@@ -4,10 +4,16 @@
 # See https://github.com/kolloch/crate2nix for more info.
 
 { nixpkgs ? <nixpkgs>
-, pkgs ? import nixpkgs { config = {}; }
+, pkgs ? import nixpkgs { }
 , fetchurl ? pkgs.fetchurl
+, fetchgit ? pkgs.fetchgit
+, callPackage ? pkgs.callPackage
 , lib ? pkgs.lib
+, buildPackages ? pkgs.buildPackages
 , stdenv ? pkgs.stdenv
+, stdenvNoCC ? pkgs.stdenvNoCC
+, symlinkJoin ? pkgs.symlinkJoin
+, runCommand ? pkgs.runCommand
 , buildRustCrateForPkgs ? pkgs: pkgs.buildRustCrate
   # This is used as the `crateOverrides` argument for `buildRustCrate`.
 , defaultCrateOverrides ? pkgs.defaultCrateOverrides
@@ -24,7 +30,7 @@
   # Additional crate2nix configuration if it exists.
 , crateConfig
   ? if builtins.pathExists ./crate-config.nix
-    then pkgs.callPackage ./crate-config.nix {}
+    then callPackage ./crate-config.nix {}
     else {}
 }:
 
@@ -65,7 +71,7 @@ rec {
 
 
   # A derivation that joins the outputs of all workspace members together.
-  allWorkspaceMembers = pkgs.symlinkJoin {
+  allWorkspaceMembers = symlinkJoin {
       name = "all-workspace-members";
       paths =
         let members = builtins.attrValues workspaceMembers;
@@ -485,7 +491,7 @@ rec {
         edition = "2018";
         links = "rocksdb";
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/rust-rocksdb/rust-rocksdb";
           rev = "66f04df013b6e6bd42b5a8c353406e09a7c7da2a";
           sha256 = "1rchvjrjamdaznx26gy4bmjj10rrf00mgc1wvkc489r9z1nh4h1h";
@@ -837,7 +843,7 @@ rec {
         version = "0.21.0";
         edition = "2018";
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/rust-rocksdb/rust-rocksdb";
           rev = "66f04df013b6e6bd42b5a8c353406e09a7c7da2a";
           sha256 = "1rchvjrjamdaznx26gy4bmjj10rrf00mgc1wvkc489r9z1nh4h1h";
@@ -1504,15 +1510,15 @@ rec {
             # If the user hasn't set any pre/post commands, we don't want to
             # insert empty lines. This means that any existing users of crate2nix
             # don't get a spurious rebuild unless they set these explicitly.
-            testCommand = pkgs.lib.concatStringsSep "\n" (
-              pkgs.lib.filter (s: s != "") [
+            testCommand = lib.concatStringsSep "\n" (
+              lib.filter (s: s != "") [
                 testPreRun
                 "$f $testCrateFlags 2>&1 | tee -a $out"
                 testPostRun
               ]
             );
           in
-          pkgs.stdenvNoCC.mkDerivation {
+          stdenvNoCC.mkDerivation {
             name = "run-tests-${testCrate.name}";
 
             inherit (crate) src;
@@ -1548,7 +1554,7 @@ rec {
             '';
           };
       in
-      pkgs.runCommand "${crate.name}-linked"
+      runCommand "${crate.name}-linked"
         {
           inherit (crate) outputs crateName;
           passthru = (crate.passthru or { }) // {
@@ -1687,7 +1693,7 @@ rec {
                 )
                 crateConfigs;
               target = makeTarget stdenv.hostPlatform;
-              build = mkBuiltByPackageIdByPkgs pkgs.buildPackages;
+              build = mkBuiltByPackageIdByPkgs buildPackages;
             };
           in
           self;
@@ -1762,7 +1768,7 @@ rec {
             crateConfig
             // {
               src =
-                crateConfig.src or (pkgs.fetchurl rec {
+                crateConfig.src or (fetchurl rec {
                   name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
                   # https://www.pietroalbini.org/blog/downloading-crates-io/
                   # Not rate-limited, CDN URL.
diff --git a/sample_projects/codegen/Cargo.nix b/sample_projects/codegen/Cargo.nix
index 91bdd375..2196d635 100644
--- a/sample_projects/codegen/Cargo.nix
+++ b/sample_projects/codegen/Cargo.nix
@@ -4,10 +4,16 @@
 # See https://github.com/kolloch/crate2nix for more info.
 
 { nixpkgs ? <nixpkgs>
-, pkgs ? import nixpkgs { config = {}; }
+, pkgs ? import nixpkgs { }
 , fetchurl ? pkgs.fetchurl
+, fetchgit ? pkgs.fetchgit
+, callPackage ? pkgs.callPackage
 , lib ? pkgs.lib
+, buildPackages ? pkgs.buildPackages
 , stdenv ? pkgs.stdenv
+, stdenvNoCC ? pkgs.stdenvNoCC
+, symlinkJoin ? pkgs.symlinkJoin
+, runCommand ? pkgs.runCommand
 , buildRustCrateForPkgs ? pkgs: pkgs.buildRustCrate
   # This is used as the `crateOverrides` argument for `buildRustCrate`.
 , defaultCrateOverrides ? pkgs.defaultCrateOverrides
@@ -24,7 +30,7 @@
   # Additional crate2nix configuration if it exists.
 , crateConfig
   ? if builtins.pathExists ./crate-config.nix
-    then pkgs.callPackage ./crate-config.nix {}
+    then callPackage ./crate-config.nix {}
     else {}
 }:
 
@@ -65,7 +71,7 @@ rec {
 
 
   # A derivation that joins the outputs of all workspace members together.
-  allWorkspaceMembers = pkgs.symlinkJoin {
+  allWorkspaceMembers = symlinkJoin {
       name = "all-workspace-members";
       paths =
         let members = builtins.attrValues workspaceMembers;
@@ -249,7 +255,7 @@ rec {
         version = "0.9.7";
         edition = "2018";
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/diwic/dbus-rs.git";
           rev = "618262f5e3217cdd173d46d705bbac26c5141e21";
           sha256 = "0gvhz2knd1k799l7ssh4rdm5qw0vhazzr3bxpmlgq7fhy6hjazrs";
@@ -287,7 +293,7 @@ rec {
         edition = "2018";
         crateBin = [];
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/diwic/dbus-rs.git";
           rev = "618262f5e3217cdd173d46d705bbac26c5141e21";
           sha256 = "0gvhz2knd1k799l7ssh4rdm5qw0vhazzr3bxpmlgq7fhy6hjazrs";
@@ -362,7 +368,7 @@ rec {
         edition = "2015";
         links = "dbus";
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/diwic/dbus-rs.git";
           rev = "618262f5e3217cdd173d46d705bbac26c5141e21";
           sha256 = "0gvhz2knd1k799l7ssh4rdm5qw0vhazzr3bxpmlgq7fhy6hjazrs";
@@ -679,15 +685,15 @@ rec {
             # If the user hasn't set any pre/post commands, we don't want to
             # insert empty lines. This means that any existing users of crate2nix
             # don't get a spurious rebuild unless they set these explicitly.
-            testCommand = pkgs.lib.concatStringsSep "\n" (
-              pkgs.lib.filter (s: s != "") [
+            testCommand = lib.concatStringsSep "\n" (
+              lib.filter (s: s != "") [
                 testPreRun
                 "$f $testCrateFlags 2>&1 | tee -a $out"
                 testPostRun
               ]
             );
           in
-          pkgs.stdenvNoCC.mkDerivation {
+          stdenvNoCC.mkDerivation {
             name = "run-tests-${testCrate.name}";
 
             inherit (crate) src;
@@ -723,7 +729,7 @@ rec {
             '';
           };
       in
-      pkgs.runCommand "${crate.name}-linked"
+      runCommand "${crate.name}-linked"
         {
           inherit (crate) outputs crateName;
           passthru = (crate.passthru or { }) // {
@@ -862,7 +868,7 @@ rec {
                 )
                 crateConfigs;
               target = makeTarget stdenv.hostPlatform;
-              build = mkBuiltByPackageIdByPkgs pkgs.buildPackages;
+              build = mkBuiltByPackageIdByPkgs buildPackages;
             };
           in
           self;
@@ -937,7 +943,7 @@ rec {
             crateConfig
             // {
               src =
-                crateConfig.src or (pkgs.fetchurl rec {
+                crateConfig.src or (fetchurl rec {
                   name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
                   # https://www.pietroalbini.org/blog/downloading-crates-io/
                   # Not rate-limited, CDN URL.
diff --git a/sample_projects/sub_dir_crates/Cargo.nix b/sample_projects/sub_dir_crates/Cargo.nix
index 5b16ffb6..262f1d8a 100644
--- a/sample_projects/sub_dir_crates/Cargo.nix
+++ b/sample_projects/sub_dir_crates/Cargo.nix
@@ -4,10 +4,16 @@
 # See https://github.com/kolloch/crate2nix for more info.
 
 { nixpkgs ? <nixpkgs>
-, pkgs ? import nixpkgs { config = {}; }
+, pkgs ? import nixpkgs { }
 , fetchurl ? pkgs.fetchurl
+, fetchgit ? pkgs.fetchgit
+, callPackage ? pkgs.callPackage
 , lib ? pkgs.lib
+, buildPackages ? pkgs.buildPackages
 , stdenv ? pkgs.stdenv
+, stdenvNoCC ? pkgs.stdenvNoCC
+, symlinkJoin ? pkgs.symlinkJoin
+, runCommand ? pkgs.runCommand
 , buildRustCrateForPkgs ? pkgs: pkgs.buildRustCrate
   # This is used as the `crateOverrides` argument for `buildRustCrate`.
 , defaultCrateOverrides ? pkgs.defaultCrateOverrides
@@ -24,7 +30,7 @@
   # Additional crate2nix configuration if it exists.
 , crateConfig
   ? if builtins.pathExists ./crate-config.nix
-    then pkgs.callPackage ./crate-config.nix {}
+    then callPackage ./crate-config.nix {}
     else {}
 }:
 
@@ -65,7 +71,7 @@ rec {
 
 
   # A derivation that joins the outputs of all workspace members together.
-  allWorkspaceMembers = pkgs.symlinkJoin {
+  allWorkspaceMembers = symlinkJoin {
       name = "all-workspace-members";
       paths =
         let members = builtins.attrValues workspaceMembers;
@@ -93,7 +99,7 @@ rec {
         version = "0.1.0";
         edition = "2018";
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/kolloch/with_sub_crates.git";
           rev = "f8ad2b98ff0eb5fea4962f55e3ced5b0b5afe973";
           sha256 = "0nlw7rg28p6bya040cbipq4jdcdp4h3q9shdjygfk2xkva9bjl8w";
@@ -108,7 +114,7 @@ rec {
         version = "0.1.0";
         edition = "2018";
         workspace_member = null;
-        src = pkgs.fetchgit {
+        src = fetchgit {
           url = "https://github.com/kolloch/with_sub_crates.git";
           rev = "f8ad2b98ff0eb5fea4962f55e3ced5b0b5afe973";
           sha256 = "0nlw7rg28p6bya040cbipq4jdcdp4h3q9shdjygfk2xkva9bjl8w";
@@ -288,15 +294,15 @@ rec {
             # If the user hasn't set any pre/post commands, we don't want to
             # insert empty lines. This means that any existing users of crate2nix
             # don't get a spurious rebuild unless they set these explicitly.
-            testCommand = pkgs.lib.concatStringsSep "\n" (
-              pkgs.lib.filter (s: s != "") [
+            testCommand = lib.concatStringsSep "\n" (
+              lib.filter (s: s != "") [
                 testPreRun
                 "$f $testCrateFlags 2>&1 | tee -a $out"
                 testPostRun
               ]
             );
           in
-          pkgs.stdenvNoCC.mkDerivation {
+          stdenvNoCC.mkDerivation {
             name = "run-tests-${testCrate.name}";
 
             inherit (crate) src;
@@ -332,7 +338,7 @@ rec {
             '';
           };
       in
-      pkgs.runCommand "${crate.name}-linked"
+      runCommand "${crate.name}-linked"
         {
           inherit (crate) outputs crateName;
           passthru = (crate.passthru or { }) // {
@@ -471,7 +477,7 @@ rec {
                 )
                 crateConfigs;
               target = makeTarget stdenv.hostPlatform;
-              build = mkBuiltByPackageIdByPkgs pkgs.buildPackages;
+              build = mkBuiltByPackageIdByPkgs buildPackages;
             };
           in
           self;
@@ -546,7 +552,7 @@ rec {
             crateConfig
             // {
               src =
-                crateConfig.src or (pkgs.fetchurl rec {
+                crateConfig.src or (fetchurl rec {
                   name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
                   # https://www.pietroalbini.org/blog/downloading-crates-io/
                   # Not rate-limited, CDN URL.