Create an interim desktop-launch to execute the command-chain in the kf6

runtime. Following the gnome way.

extensions/desktop/command-chain-kde/Makefile

@@ -0,0 +1,13 @@
+#!/usr/bin/make -f
+
+BIN_DIR := $(DESTDIR)/snap/command-chain
+GPU_WRAPPER :=
+
+scripts = hooks-configure-fonts desktop-launch run $(GPU_WRAPPER)
+
+*:
+	install -D -m755 "$@" "$(BIN_DIR)"/"$@"
+
+install: $(scripts)
+
+.PHONY: $(scripts)

extensions/desktop/command-chain-kde/desktop-launch

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -- "${SNAP}/kf6/command-chain/desktop-launch6" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"

extensions/desktop/command-chain-kde/gpu-2404-wrapper

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -- "${SNAP}/gpu-2404/bin/gpu-2404-provider-wrapper" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"

extensions/desktop/command-chain-kde/hooks-configure-fonts

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -- "${SNAP}/kf6/command-chain/hooks-configure-fonts" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"

extensions/desktop/command-chain-kde/run

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+if [ -z "$1" ]; then
+  echo "run <command>"
+  exit 1
+fi
+
+if [ -z "${SNAP}" ]; then
+  echo "Not running inside a snap context: SNAP not declared"
+  exit
+fi
+
+
+if [ ! -f "$1" ]; then
+  echo "Content snap command-chain for $1 not found: ensure slot is connected"
+  exit
+fi
+
+# emulate "exec $@" using "source"
+# have to disable "unused variables" because checkshell doesn't know that $BASH_ARGV0 is $0
+# shellcheck disable=SC2034  # Unused variables left for readability
+BASH_ARGV0=$1
+shift
+# shellcheck source=/dev/null
+source "$0"

snapcraft/extensions/kde_neon_6.py

@@ -93,7 +93,7 @@ def is_experimental(base: Optional[str]) -> bool:
 
     @overrides
     def get_app_snippet(self) -> Dict[str, Any]:
-        command_chain = ["snap/command-chain/desktop-launch6"]
+        command_chain = ["snap/command-chain/desktop-launch"]
         if self.yaml_data["base"] == "core24":
             command_chain.insert(0, "snap/command-chain/gpu-2404-wrapper")
         return {
@@ -352,7 +352,7 @@ def get_parts_snippet(self) -> Dict[str, Any]:
         # We can change this to the lightweight command-chain when
         # the content snap includes the desktop-launch from
         # https://github.com/canonical/snapcraft-desktop-integration
-        source = get_extensions_data_dir() / "desktop" / "kde-neon-6"
+        source = get_extensions_data_dir() / "desktop" / "command-chain-kde"
 
         gpu_opts = {}
         if self.yaml_data["base"] == "core24":

tests/unit/extensions/test_kde_neon_6.py

@@ -134,7 +134,7 @@ def test_is_experimental():
 
 def test_get_app_snippet(kde_neon_6_extension):
     assert kde_neon_6_extension.get_app_snippet() == {
-        "command-chain": ["snap/command-chain/desktop-launch6"],
+        "command-chain": ["snap/command-chain/desktop-launch"],
         "plugs": [
             "desktop",
             "desktop-legacy",
@@ -153,7 +153,7 @@ def test_get_app_snippet_core24(kde_neon_6_extension_core24):
     assert kde_neon_6_extension_core24.get_app_snippet() == {
         "command-chain": [
             "snap/command-chain/gpu-2404-wrapper",
-            "snap/command-chain/desktop-launch6",
+            "snap/command-chain/desktop-launch",
         ],
         "plugs": [
             "desktop",
@@ -705,7 +705,7 @@ def assert_get_part_snippet(kde_neon_6_instance):
 
 
 def test_get_parts_snippet(kde_neon_6_extension):
-    source = get_extensions_data_dir() / "desktop" / "kde-neon-6"
+    source = get_extensions_data_dir() / "desktop" / "command-chain-kde"
 
     assert kde_neon_6_extension.get_parts_snippet() == {
         "kde-neon-6/sdk": {
@@ -729,7 +729,7 @@ def test_get_parts_snippet(kde_neon_6_extension):
 
 
 def test_get_parts_snippet_core24(kde_neon_6_extension_core24):
-    source = get_extensions_data_dir() / "desktop" / "kde-neon-6"
+    source = get_extensions_data_dir() / "desktop" / "command-chain-kde"
 
     assert kde_neon_6_extension_core24.get_parts_snippet() == {
         "kde-neon-6/sdk": {
@@ -755,7 +755,7 @@ def test_get_parts_snippet_core24(kde_neon_6_extension_core24):
 
 
 def test_get_parts_snippet_with_external_sdk(kde_neon_6_extension_with_build_snap):
-    source = get_extensions_data_dir() / "desktop" / "kde-neon-6"
+    source = get_extensions_data_dir() / "desktop" / "command-chain-kde"
 
     assert kde_neon_6_extension_with_build_snap.get_parts_snippet() == {
         "kde-neon-6/sdk": {
@@ -769,7 +769,7 @@ def test_get_parts_snippet_with_external_sdk(kde_neon_6_extension_with_build_sna
 def test_get_parts_snippet_with_external_sdk_different_channel(
     kde_neon_6_extension_with_default_build_snap_from_latest_edge_core24,
 ):
-    source = get_extensions_data_dir() / "desktop" / "kde-neon-6"
+    source = get_extensions_data_dir() / "desktop" / "command-chain-kde"
     assert kde_neon_6_extension_with_default_build_snap_from_latest_edge_core24.get_parts_snippet() == {
         "kde-neon-6/sdk": {
             "source": str(source),