dotnet: make 'dotnet' available to 'sudo' commands (#1007)

* dotnet: use predefined DOTNET_ROOT in install script

* dotnet: create symbolic link in /usr/bin

* dotnet: bump patch version

* dotnet: add test for install dir and symlink

* Remove unneeded --force

src/dotnet/devcontainer-feature.json

 {
     "id": "dotnet",
-    "version": "2.1.0",
+    "version": "2.1.1",
     "name": "Dotnet CLI",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/dotnet",
     "description": "This Feature installs the latest .NET SDK, which includes the .NET CLI and the shared runtime. Options are provided to choose a different version or additional versions.",

src/dotnet/install.sh

@@ -128,6 +128,12 @@ if [ ${#workloads[@]} -ne 0 ]; then
     install_workloads "${workloads[@]}"
 fi
 
+# Create a symbolic link '/usr/bin/dotnet', to make dotnet available to 'sudo'
+# This is necessary because 'sudo' resets the PATH variable, so it won't search the DOTNET_ROOT directory
+if [ ! -e /usr/bin/dotnet ]; then
+    ln --symbolic "$DOTNET_ROOT/dotnet" /usr/bin/dotnet
+fi
+
 # Clean up
 rm -rf /var/lib/apt/lists/*
 rm -rf scripts

src/dotnet/scripts/dotnet-helpers.sh

@@ -8,7 +8,6 @@
 # Maintainer: The Dev Container spec maintainers
 DOTNET_SCRIPTS=$(dirname "${BASH_SOURCE[0]}")
 DOTNET_INSTALL_SCRIPT="$DOTNET_SCRIPTS/vendor/dotnet-install.sh"
-DOTNET_INSTALL_DIR='/usr/share/dotnet'
 
 # Prints the latest dotnet version in the specified channel
 # Usage: fetch_latest_version_in_channel <channel> [<runtime>]
@@ -75,11 +74,11 @@ install_sdk() {
     fi
     
     # Currently this script does not make it possible to qualify the version, 'GA' is always implied
-    echo "Executing $DOTNET_INSTALL_SCRIPT --version $version --channel $channel --install-dir $DOTNET_INSTALL_DIR"
+    echo "Executing $DOTNET_INSTALL_SCRIPT --version $version --channel $channel --install-dir $DOTNET_ROOT"
     "$DOTNET_INSTALL_SCRIPT" \
         --version "$version" \
         --channel "$channel" \
-        --install-dir "$DOTNET_INSTALL_DIR"
+        --install-dir "$DOTNET_ROOT"
 }
 
 # Installs a version of the .NET Runtime
@@ -107,12 +106,12 @@ install_runtime() {
         version="$inputVersion"
     fi
     
-    echo "Executing $DOTNET_INSTALL_SCRIPT --runtime $runtime --version $version --channel $channel --install-dir $DOTNET_INSTALL_DIR --no-path"
+    echo "Executing $DOTNET_INSTALL_SCRIPT --runtime $runtime --version $version --channel $channel --install-dir $DOTNET_ROOT --no-path"
     "$DOTNET_INSTALL_SCRIPT" \
         --runtime "$runtime" \
         --version "$version" \
         --channel "$channel" \
-        --install-dir "$DOTNET_INSTALL_DIR" \
+        --install-dir "$DOTNET_ROOT" \
         --no-path
 }
 

test/dotnet/test.sh

@@ -13,6 +13,12 @@ source dev-container-features-test-lib
 source dotnet_env.sh
 source dotnet_helpers.sh
 
+check "dotnet is installed in DOTNET_ROOT and execute permission is granted" \
+test -x "$DOTNET_ROOT/dotnet" 
+
+check "dotnet is symlinked correctly in /usr/bin" \
+test -L /usr/bin/dotnet -a "$(readlink -f /usr/bin/dotnet)" = "$DOTNET_ROOT/dotnet"
+
 expected=$(fetch_latest_version)
 
 check "Latest .NET SDK version installed" \