cmd/podman: add replace flag to quadlet install

cmd/podman/quadlet/install.go

@@ -36,6 +36,7 @@ podman quadlet install https://github.com/containers/podman/blob/main/test/e2e/q
 func installFlags(cmd *cobra.Command) {
 	flags := cmd.Flags()
 	flags.BoolVar(&installOptions.ReloadSystemd, "reload-systemd", true, "Reload systemd after installing Quadlets")
+	flags.BoolVarP(&installOptions.Replace, "replace", "r", false, "Replace the installation even if the quadlet already exists")
 }
 
 func init() {

docs/source/markdown/podman-quadlet-install.1.md

@@ -28,6 +28,12 @@ Reload systemd after installing Quadlets (default true).
 In order to disable it users need to manually set the value
 of this flag to `false`.
 
+#### **--replace**, **-r**
+
+Replace the Quadlet installation even if the generated unit file already exists (default false).
+In order to enable it, users need to manually set the value
+of this flag to `true`. This flag is used primarily to update an existing unit.
+
 ## EXAMPLES
 
 Install quadlet from a file.

pkg/domain/entities/quadlet.go

@@ -4,6 +4,8 @@ package entities
 type QuadletInstallOptions struct {
 	// Whether to reload systemd after installation is completed
 	ReloadSystemd bool
+	// Replace the installation even if the quadlet already exists
+	Replace bool
 }
 
 // QuadletInstallReport contains the output of the `quadlet install` command

pkg/domain/infra/abi/quadlet.go

@@ -197,7 +197,7 @@ func (ic *ContainerEngine) QuadletInstall(ctx context.Context, pathsOrURLs []str
 				installReport.QuadletErrors[toInstall] = fmt.Errorf("populating temporary file: %w", err)
 				continue
 			}
-			installedPath, err := ic.installQuadlet(ctx, tmpFile.Name(), quadletFileName, installDir, assetFile, validateQuadletFile)
+			installedPath, err := ic.installQuadlet(ctx, tmpFile.Name(), quadletFileName, installDir, assetFile, validateQuadletFile, options.Replace)
 			if err != nil {
 				installReport.QuadletErrors[toInstall] = err
 				continue
@@ -210,7 +210,7 @@ func (ic *ContainerEngine) QuadletInstall(ctx context.Context, pathsOrURLs []str
 				continue
 			}
 			// If toInstall is a single file, execute the original logic
-			installedPath, err := ic.installQuadlet(ctx, toInstall, "", installDir, assetFile, validateQuadletFile)
+			installedPath, err := ic.installQuadlet(ctx, toInstall, "", installDir, assetFile, validateQuadletFile, options.Replace)
 			if err != nil {
 				installReport.QuadletErrors[toInstall] = err
 				continue
@@ -254,7 +254,7 @@ func getFileName(resp *http.Response, fileURL string) (string, error) {
 // Perform some minimal validation, but not much.
 // We can't know about a lot of problems without running the Quadlet binary, which we
 // only want to do once.
-func (ic *ContainerEngine) installQuadlet(_ context.Context, path, destName, installDir, assetFile string, isQuadletFile bool) (string, error) {
+func (ic *ContainerEngine) installQuadlet(_ context.Context, path, destName, installDir, assetFile string, isQuadletFile, replace bool) (string, error) {
 	// First, validate that the source path exists and is a file
 	stat, err := os.Stat(path)
 	if err != nil {
@@ -274,9 +274,15 @@ func (ic *ContainerEngine) installQuadlet(_ context.Context, path, destName, ins
 		return "", fmt.Errorf("%q is not a supported Quadlet file type", filepath.Ext(finalPath))
 	}
 
-	file, err := os.OpenFile(finalPath, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0644)
+	var osFlags = os.O_CREATE | os.O_WRONLY
+
+	if !replace {
+		osFlags |= os.O_EXCL
+	}
+
+	file, err := os.OpenFile(finalPath, osFlags, 0644)
 	if err != nil {
-		if errors.Is(err, fs.ErrExist) {
+		if errors.Is(err, fs.ErrExist) && !replace {
 			return "", fmt.Errorf("a Quadlet with name %s already exists, refusing to overwrite", filepath.Base(finalPath))
 		}
 		return "", fmt.Errorf("unable to open file %s: %w", filepath.Base(finalPath), err)

test/system/253-podman-quadlet.bats

@@ -461,4 +461,43 @@ EOF
     assert $status -eq 0 "quadlet rm --ignore should succeed even for non-existent quadlets"
 }
 
+@test "quadlet install --replace" {
+    local install_dir=$(get_quadlet_install_dir)
+    # Create a test quadlet file
+    local quadlet_file=$PODMAN_TMPDIR/alpine-quadlet.container
+    local initial_exec='Exec=sh -c "echo STARTED CONTAINER; trap '\''exit'\'' SIGTERM; while :; do sleep 0.1; done"'
+    cat > $quadlet_file <<EOF
+[Container]
+Image=$IMAGE
+$initial_exec
+EOF
+    # Test quadlet install
+    run_podman quadlet install $quadlet_file
+    # Verify install output contains the quadlet name on a single line
+    assert "$output" =~ "alpine-quadlet.container" "install output should contain quadlet name"
+
+    # Without replace should fail
+    run_podman 125 quadlet install $quadlet_file
+    assert "$output" =~ "refusing to overwrite" "reinstall without --replace must fail with the overwrite error message"
+
+    cat > $quadlet_file <<EOF
+[Container]
+Image=$IMAGE
+Exec=sh -c "echo STARTED CONTAINER UPDATED; trap 'exit' SIGTERM; while :; do sleep 0.1; done"
+EOF
+    # With replace should pass and update quadlet
+    run_podman quadlet install --replace $quadlet_file
+
+    # Verify install output contains the quadlet name on a single line
+    assert "$output" =~ "alpine-quadlet.container" "install output should contain quadlet name"
+
+    run_podman quadlet print alpine-quadlet.container
+
+    assert "$output" !~ "$initial_exec" "Printed content must not show the initial version"
+    assert "$output" == "$(<$quadlet_file)" "Printed content must match the updated file content"
+
+    # Clean up
+    run_podman quadlet rm alpine-quadlet.container
+}
+
 # vim: filetype=sh