yadm: allow omitting some dependencies

pkgs/by-name/ya/yadm/package.nix

@@ -26,8 +26,19 @@
   installShellFiles,
   runCommand,
   yadm,
-}:
 
+  # Templates:
+  withAwk ? true,
+  withEsh ? true,
+  withJ2 ? true,
+
+  # Encryption:
+  withGpg ? true,
+  withOpenssl ? true,
+}:
+let
+  withTar = withGpg || withOpenssl;
+in
 resholve.mkDerivation (finalAttrs: {
   pname = "yadm";
   version = "3.5.0";
@@ -62,32 +73,32 @@ resholve.mkDerivation (finalAttrs: {
       scripts = [ "bin/yadm" ];
       interpreter = "${bash}/bin/sh";
       inputs = [
+        bash
+        coreutils
         git
-        gnupg
-        openssl
-        gawk
         # see head comment
         # git-crypt
         # transcrypt
-        j2cli
-        esh
-        bash
-        coreutils
-        gnutar
-      ];
+      ]
+      ++ lib.optional withGpg gnupg
+      ++ lib.optional withOpenssl openssl
+      ++ lib.optional withAwk gawk
+      ++ lib.optional withJ2 j2cli
+      ++ lib.optional withEsh esh
+      ++ lib.optional withTar gnutar;
       fake = {
-        external = if stdenv.hostPlatform.isCygwin then [ ] else [ "cygpath" ];
+        external = lib.optional (!stdenv.hostPlatform.isCygwin) "cygpath" ++ lib.optional (!withTar) "tar";
       };
       fix = {
-        "$GPG_PROGRAM" = [ "gpg" ];
-        "$OPENSSL_PROGRAM" = [ "openssl" ];
         "$GIT_PROGRAM" = [ "git" ];
-        "$AWK_PROGRAM" = [ "awk" ];
+        "$GPG_PROGRAM" = lib.optional withGpg "gpg";
+        "$OPENSSL_PROGRAM" = lib.optional withOpenssl "openssl";
+        "$AWK_PROGRAM" = lib.optional withAwk "awk";
         # see head comment
         # "$GIT_CRYPT_PROGRAM" = [ "git-crypt" ];
         # "$TRANSCRYPT_PROGRAM" = [ "transcrypt" ];
-        "$J2CLI_PROGRAM" = [ "j2" ];
-        "$ESH_PROGRAM" = [ "esh" ];
+        "$J2CLI_PROGRAM" = lib.optional withJ2 "j2";
+        "$ESH_PROGRAM" = lib.optional withEsh "esh";
         # not in nixpkgs (yet)
         # "$ENVTPL_PROGRAM" = [ "envtpl" ];
         # "$LSB_RELEASE_PROGRAM" = [ "lsb_release" ];
@@ -100,6 +111,12 @@ resholve.mkDerivation (finalAttrs: {
         "$hook_command" = true; # ~git hooks?
         "exec" = [ "$YADM_BOOTSTRAP" ]; # yadm bootstrap script
 
+        "$GPG_PROGRAM" = !withGpg;
+        "$OPENSSL_PROGRAM" = !withOpenssl;
+        "$AWK_PROGRAM" = !withAwk;
+        "$J2CLI_PROGRAM" = !withJ2;
+        "$ESH_PROGRAM" = !withEsh;
+
         # not in nixpkgs
         "$ENVTPL_PROGRAM" = true;
         "$LSB_RELEASE_PROGRAM" = true;