Add support for provisioning and rebuilding via interface

internal/wisski/ingredient/barrel/composer/composer.go

@@ -0,0 +1,59 @@
+package composer
+
+import (
+	"context"
+	"errors"
+	"io"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient/barrel"
+	"github.com/tkw1536/pkglib/stream"
+)
+
+// Drush implements commands related to drush
+type Composer struct {
+	ingredient.Base
+	Dependencies struct {
+		Barrel *barrel.Barrel
+		//		PHP    *php.PHP
+	}
+}
+
+// Exec executes a composer command
+func (composer *Composer) Exec(ctx context.Context, progress io.Writer, command ...string) error {
+	if err := composer.Dependencies.Barrel.ShellScript(ctx, stream.NonInteractive(progress), append([]string{"composer", "--no-interaction", "--working-dir", barrel.ComposerDirectory}, command...)...); err != nil {
+		return err
+	}
+	return nil
+}
+
+// FixPermissions fixes the permissions of the sites directory.
+// This needs to be run after every installation of a composer module.
+func (composer *Composer) FixPermission(ctx context.Context, progress io.Writer) error {
+	composer.Dependencies.Barrel.ShellScript(ctx, stream.NonInteractive(progress), "chmod", "-R", "u+w", barrel.SitesDirectory)
+	return nil
+}
+
+// Install attempts runs 'composer require' with the given arguments
+// Spec is like a specification on the command line.
+func (composer *Composer) Install(ctx context.Context, progress io.Writer, args ...string) error {
+	composer.FixPermission(ctx, progress)
+
+	requires := append([]string{"require"}, args...)
+	if err := composer.Exec(ctx, progress, requires...); err != nil {
+		return err
+	}
+	return nil
+}
+
+var ErrNotInstalled = errors.New("Composer: Not installed")
+
+// TryInstall attempts to install the given package.
+// If it cannot be installed, returns ErrNotInstalled.
+func (composer *Composer) TryInstall(ctx context.Context, progress io.Writer, spec string) error {
+	if err := composer.Exec(ctx, io.Discard, "require", "--dry-run", spec); err != nil {
+		return ErrNotInstalled
+	}
+
+	return composer.Install(ctx, progress, spec)
+}

internal/wisski/ingredient/barrel/composer/name.go

@@ -0,0 +1,14 @@
+package composer
+
+import "strings"
+
+// ModuleName extracts the module name from a specification.
+// If the module name cannot be found, returns the string unchanged
+func ModuleName(spec string) string {
+	_, name, found := strings.Cut(spec, "/")
+	if !found {
+		return spec
+	}
+	name, _, _ = strings.Cut(name, ":")
+	return name
+}