feat: add sgpython and sgpoetry tools

For Python projects managed by Poetry.

tools/sgpoetry/command.go

@@ -0,0 +1,48 @@
+package sgpoetry
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"go.einride.tech/sage/sg"
+	"go.einride.tech/sage/sgtool"
+	"go.einride.tech/sage/tools/sgpython"
+)
+
+const (
+	name    = "poetry"
+	version = "1.5.1"
+)
+
+func Command(ctx context.Context, args ...string) *exec.Cmd {
+	sg.Deps(ctx, PrepareCommand)
+	return sg.Command(ctx, sg.FromBinDir(name), args...)
+}
+
+func PrepareCommand(ctx context.Context) error {
+	toolDir := sg.FromToolsDir(name, version)
+	poetry := filepath.Join(toolDir, "bin", name)
+	if _, err := os.Stat(poetry); err == nil {
+		if _, err := sgtool.CreateSymlink(poetry); err != nil {
+			return err
+		}
+		return nil
+	}
+	// See: https://python-poetry.org/docs/#installing-manually
+	if err := sgpython.Command(ctx, "-m", "venv", toolDir).Run(); err != nil {
+		return err
+	}
+	pip := filepath.Join(toolDir, "bin", "pip")
+	if err := sg.Command(ctx, pip, "install", "-U", "pip", "setuptools").Run(); err != nil {
+		return err
+	}
+	if err := sg.Command(ctx, pip, "install", name+"=="+version).Run(); err != nil {
+		return err
+	}
+	if _, err := sgtool.CreateSymlink(poetry); err != nil {
+		return err
+	}
+	return nil
+}

tools/sgpython/command.go

@@ -0,0 +1,71 @@
+package sgpython
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"go.einride.tech/sage/sg"
+	"go.einride.tech/sage/sgtool"
+	"go.einride.tech/sage/tools/sggit"
+)
+
+const (
+	name         = "python"
+	version      = "3.11.3"
+	pyenvVersion = "2.3.18"
+)
+
+func Command(ctx context.Context, args ...string) *exec.Cmd {
+	sg.Deps(ctx, PrepareCommand)
+	return sg.Command(ctx, sg.FromBinDir(name), args...)
+}
+
+func PrepareCommand(ctx context.Context) error {
+	toolDir := sg.FromToolsDir(name, version)
+	pyenvDir := filepath.Join(toolDir, "pyenv")
+	binDir := filepath.Join(pyenvDir, "versions", version, "bin")
+	pythonFromPyenv := filepath.Join(binDir, "python")
+	if _, err := os.Stat(pythonFromPyenv); err == nil {
+		if _, err := sgtool.CreateSymlink(pythonFromPyenv); err != nil {
+			return err
+		}
+		return nil
+	} else if systemPython3, err := exec.LookPath("python3"); err == nil {
+		// Special case: Avoid building from source if we already have Python 3 on the system.
+		symlink := filepath.Join(sg.FromBinDir(), name)
+		if _, err := os.Lstat(symlink); err == nil {
+			if err := os.Remove(symlink); err != nil {
+				return err
+			}
+		}
+		return os.Symlink(systemPython3, symlink)
+	}
+	if err := os.RemoveAll(pyenvDir); err != nil {
+		return err
+	}
+	if err := sggit.Command(
+		ctx,
+		"clone",
+		"--depth",
+		"1",
+		"--branch",
+		"v"+pyenvVersion,
+		"https://github.com/pyenv/pyenv.git",
+		pyenvDir,
+	).Run(); err != nil {
+		return err
+	}
+	cmd := sg.Command(ctx, "bin/pyenv", "install", version)
+	cmd.Dir = pyenvDir
+	cmd.Env = append(cmd.Env, fmt.Sprintf("PYENV_ROOT=%s", pyenvDir))
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+	if _, err := sgtool.CreateSymlink(pythonFromPyenv); err != nil {
+		return err
+	}
+	return nil
+}