git: support not configuring signing.format (#6478)

tests/modules/programs/git/default.nix

@@ -6,5 +6,6 @@
   git-with-signing-key-id-legacy = ./git-with-signing-key-id-legacy.nix;
   git-with-signing-key-id = ./git-with-signing-key-id.nix;
   git-without-signing-key-id = ./git-without-signing-key-id.nix;
+  git-without-signing = ./git-without-signing.nix;
   git-with-hooks = ./git-with-hooks.nix;
 }

tests/modules/programs/git/git-with-email-expected.conf

@@ -1,11 +1,8 @@
-[commit]
-	gpgSign = false
-
 [gpg]
 	format = "openpgp"
 
 [gpg "openpgp"]
-	program = "path-to-gpg"
+	program = "@gnupg@/bin/gpg"
 
 [sendemail "hm-account"]
 	from = "H. M. Test Jr. <hm@example.org>"
@@ -21,9 +18,6 @@
 	smtpSslCertPath = "/etc/ssl/certs/ca-certificates.crt"
 	smtpUser = "home.manager"
 
-[tag]
-	gpgSign = false
-
 [user]
 	email = "hm@example.com"
 	name = "H. M. Test"

tests/modules/programs/git/git-with-email.nix

@@ -8,7 +8,6 @@
 
   programs.git = {
     enable = true;
-    signing.signer = "path-to-gpg";
     userEmail = "hm@example.com";
     userName = "H. M. Test";
   };

tests/modules/programs/git/git-with-msmtp-expected.conf

@@ -1,6 +1,3 @@
-[commit]
-	gpgSign = false
-
 [gpg]
 	format = "openpgp"
 
@@ -19,9 +16,6 @@
 	from = "H. M. Test <hm@example.com>"
 	smtpServer = "@msmtp@/bin/msmtp"
 
-[tag]
-	gpgSign = false
-
 [user]
 	email = "hm@example.com"
 	name = "H. M. Test"

tests/modules/programs/git/git-with-str-extra-config-expected.conf

@@ -1,17 +1,11 @@
 This can be anything.
 
-[commit]
-	gpgSign = false
-
 [gpg]
 	format = "openpgp"
 
 [gpg "openpgp"]
 	program = "path-to-gpg"
 
-[tag]
-	gpgSign = false
-
 [user]
 	email = "user@example.org"
 	name = "John Doe"

tests/modules/programs/git/git-without-signing.conf

@@ -0,0 +1,3 @@
+[user]
+	email = "user@example.org"
+	name = "John Doe"

tests/modules/programs/git/git-without-signing.nix

@@ -0,0 +1,16 @@
+{
+  programs.git = {
+    enable = true;
+    userName = "John Doe";
+    userEmail = "user@example.org";
+  };
+
+  home.stateVersion = "25.05";
+
+  nmt.script = ''
+    assertFileExists home-files/.config/git/config
+    assertFileContent home-files/.config/git/config ${
+      ./git-without-signing.conf
+    }
+  '';
+}