fetchgit: give leaveDotGit, nonConeMode, and sparseCheckout a default value null

pkgs/build-support/fetchgit/builder.sh

@@ -19,7 +19,7 @@ $SHELL $fetcher --builder --url "$url" --out "$out" --rev "$rev" --name "$name"
   ${deepClone:+--deepClone} \
   ${fetchSubmodules:+--fetch-submodules} \
   ${fetchTags:+--fetch-tags} \
-  ${sparseCheckout:+--sparse-checkout "$sparseCheckout"} \
+  ${sparseCheckoutText:+--sparse-checkout "$sparseCheckoutText"} \
   ${nonConeMode:+--non-cone-mode} \
   ${branchName:+--branch-name "$branchName"} \
   ${rootDir:+--root-dir "$rootDir"}

pkgs/build-support/fetchgit/default.nix

@@ -66,14 +66,17 @@ lib.makeOverridable (
             # when rootDir is specified, avoid invalidating the result when rev changes
             append = if rootDir != "" then "-${lib.strings.sanitizeDerivationName rootDir}" else "";
           },
-          leaveDotGit ? deepClone || fetchTags,
+          # When null, will default to: `deepClone || fetchTags`
+          leaveDotGit ? null,
           outputHash ? lib.fakeHash,
           outputHashAlgo ? null,
           fetchSubmodules ? true,
           deepClone ? false,
           branchName ? null,
-          sparseCheckout ? lib.optional (rootDir != "") rootDir,
-          nonConeMode ? rootDir != "",
+          # When null, will default to: `lib.optional (rootdir != "") rootdir`
+          sparseCheckout ? null,
+          # When null, will default to: `rootDir != ""`
+          nonConeMode ? null,
           nativeBuildInputs ? [ ],
           # Shell code executed before the file has been fetched.  This, in
           # particular, can do things like set NIX_PREFETCH_GIT_CHECKOUT_HOOK to
@@ -128,99 +131,107 @@ lib.makeOverridable (
           server admins start using the new version?
         */
 
-        assert nonConeMode -> (sparseCheckout != [ ]);
-        assert fetchTags -> leaveDotGit;
-        assert rootDir != "" -> !leaveDotGit;
-
-        if builtins.isString sparseCheckout then
-          # Changed to throw on 2023-06-04
-          throw
-            "Please provide directories/patterns for sparse checkout as a list of strings. Passing a (multi-line) string is not supported any more."
-        else
-          derivationArgs
-          // {
-            inherit name;
-
-            builder = ./builder.sh;
-            fetcher = ./nix-prefetch-git;
-
-            nativeBuildInputs = [
-              git
-              cacert
-            ]
-            ++ lib.optionals fetchLFS [ git-lfs ]
-            ++ nativeBuildInputs;
-
-            inherit outputHash outputHashAlgo;
-            outputHashMode = "recursive";
-
+        derivationArgs
+        // {
+          inherit name;
+
+          builder = ./builder.sh;
+          fetcher = ./nix-prefetch-git;
+
+          nativeBuildInputs = [
+            git
+            cacert
+          ]
+          ++ lib.optionals fetchLFS [ git-lfs ]
+          ++ nativeBuildInputs;
+
+          inherit outputHash outputHashAlgo;
+          outputHashMode = "recursive";
+
+          sparseCheckout =
+            let
+              default = lib.optional (finalAttrs.rootDir != "") finalAttrs.rootDir;
+            in
+            lib.defaultTo default sparseCheckout;
+          sparseCheckoutText =
+            # Changed to throw on 2023-06-04
+            assert (
+              lib.assertMsg (lib.isList finalAttrs.sparseCheckout) "Please provide directories/patterns for sparse checkout as a list of strings. Passing a (multi-line) string is not supported any more."
+            );
+            assert finalAttrs.nonConeMode -> (finalAttrs.sparseCheckout != [ ]);
             # git-sparse-checkout(1) says:
             # > When the --stdin option is provided, the directories or patterns are read
             # > from standard in as a newline-delimited list instead of from the arguments.
-            sparseCheckout = builtins.concatStringsSep "\n" sparseCheckout;
-
-            inherit
-              url
+            builtins.concatStringsSep "\n" finalAttrs.sparseCheckout;
+
+          inherit
+            url
+            fetchLFS
+            fetchSubmodules
+            deepClone
+            branchName
+            preFetch
+            postFetch
+            fetchTags
+            rootDir
+            gitConfigFile
+            ;
+          leaveDotGit =
+            if leaveDotGit != null then
+              assert fetchTags -> leaveDotGit;
+              assert rootDir != "" -> !leaveDotGit;
               leaveDotGit
-              fetchLFS
-              fetchSubmodules
-              deepClone
-              branchName
-              nonConeMode
-              preFetch
-              postFetch
-              fetchTags
-              rootDir
-              gitConfigFile
-              ;
-            inherit tag;
-            revCustom = rev;
-            rev = getRevWithTag {
-              inherit (finalAttrs) tag;
-              rev = finalAttrs.revCustom;
-            };
-
-            postHook =
-              if netrcPhase == null then
-                null
-              else
-                ''
-                  ${netrcPhase}
-                  # required that git uses the netrc file
-                  mv {,.}netrc
-                  export NETRC=$PWD/.netrc
-                  export HOME=$PWD
-                '';
-
-            impureEnvVars =
-              lib.fetchers.proxyImpureEnvVars
-              ++ netrcImpureEnvVars
-              ++ [
-                "GIT_PROXY_COMMAND"
-                "NIX_GIT_SSL_CAINFO"
-                "SOCKS_SERVER"
-
-                # This is a parameter intended to be set by setup hooks or preFetch
-                # scripts that want per-URL control over HTTP proxies used by Git
-                # (if per-URL control isn't needed, `http_proxy` etc. will
-                # suffice). It must be a whitespace-separated (with backslash as an
-                # escape character) list of pairs like this:
-                #
-                #   http://domain1/path1 proxy1 https://domain2/path2 proxy2
-                #
-                # where the URLs are as documented in the `git-config` manual page
-                # under `http.<url>.*`, and the proxies are as documented on the
-                # same page under `http.proxy`.
-                "FETCHGIT_HTTP_PROXIES"
-              ];
-
-            inherit preferLocalBuild meta allowedRequisites;
-
-            passthru = {
-              gitRepoUrl = url;
-            }
-            // passthru;
+            else
+              deepClone || fetchTags;
+          nonConeMode = lib.defaultTo (finalAttrs.rootDir != "") nonConeMode;
+          inherit tag;
+          revCustom = rev;
+          rev = getRevWithTag {
+            inherit (finalAttrs) tag;
+            rev = finalAttrs.revCustom;
+          };
+
+          postHook =
+            if netrcPhase == null then
+              null
+            else
+              ''
+                ${netrcPhase}
+                # required that git uses the netrc file
+                mv {,.}netrc
+                export NETRC=$PWD/.netrc
+                export HOME=$PWD
+              '';
+
+          impureEnvVars =
+            lib.fetchers.proxyImpureEnvVars
+            ++ netrcImpureEnvVars
+            ++ [
+              "GIT_PROXY_COMMAND"
+              "NIX_GIT_SSL_CAINFO"
+              "SOCKS_SERVER"
+
+              # This is a parameter intended to be set by setup hooks or preFetch
+              # scripts that want per-URL control over HTTP proxies used by Git
+              # (if per-URL control isn't needed, `http_proxy` etc. will
+              # suffice). It must be a whitespace-separated (with backslash as an
+              # escape character) list of pairs like this:
+              #
+              #   http://domain1/path1 proxy1 https://domain2/path2 proxy2
+              #
+              # where the URLs are as documented in the `git-config` manual page
+              # under `http.<url>.*`, and the proxies are as documented on the
+              # same page under `http.proxy`.
+              "FETCHGIT_HTTP_PROXIES"
+            ];
+
+          inherit preferLocalBuild meta allowedRequisites;
+
+          passthru = {
+            gitRepoUrl = url;
           }
+          // passthru;
+        }
       );
 
     # No ellipsis.

pkgs/build-support/fetchgithub/default.nix

@@ -13,14 +13,16 @@ lib.makeOverridable (
     rev ? null,
     # TODO(@ShamrockLee): Add back after reconstruction with lib.extendMkDerivation
     # name ? repoRevToNameMaybe finalAttrs.repo (lib.revOrTag finalAttrs.revCustom finalAttrs.tag) "github",
+    # `fetchFromGitHub` defaults to use `fetchzip` for better hash stability.
+    # We default not to fetch submodules, which is contrary to `fetchgit`'s default.
     fetchSubmodules ? false,
     leaveDotGit ? null,
     deepClone ? false,
     private ? false,
     forceFetchGit ? false,
     fetchLFS ? false,
     rootDir ? "",
-    sparseCheckout ? lib.optional (rootDir != "") rootDir,
+    sparseCheckout ? null,
     githubBase ? "github.com",
     varPrefix ? null,
     passthru ? { },
@@ -68,12 +70,12 @@ lib.makeOverridable (
     varBase = "NIX${lib.optionalString (varPrefix != null) "_${varPrefix}"}_GITHUB_PRIVATE_";
     useFetchGit =
       fetchSubmodules
-      || (leaveDotGit == true)
+      || lib.defaultTo false leaveDotGit == true
       || deepClone
       || forceFetchGit
       || fetchLFS
       || (rootDir != "")
-      || (sparseCheckout != [ ]);
+      || lib.defaultTo [ ] sparseCheckout != [ ];
     # We prefer fetchzip in cases we don't need submodules as the hash
     # is more stable in that case.
     fetcher =
@@ -122,6 +124,7 @@ lib.makeOverridable (
               rev
               deepClone
               fetchSubmodules
+              leaveDotGit
               sparseCheckout
               fetchLFS
               ;
@@ -135,7 +138,6 @@ lib.makeOverridable (
                 ;
             };
           }
-          // lib.optionalAttrs (leaveDotGit != null) { inherit leaveDotGit; }
         else
           let
             revWithTag = finalAttrs.rev;