tt: add env module

Added module that adds 'tt' and 'tarantool' (installed using 'tt') to the
current environment.

Closes #338

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Make cartridge app dependencies less strict.
 
+### Added
+
+- `tt env`: add current environment binaries location to the PATH variable.
+
 ## [2.0.0] - 2023-11-13
 
 ### Changed

README.md

@@ -34,6 +34,7 @@ Tarantool-based applications.
   * [Working with application templates](#Working-with-application-templates)
   * [Working with tt daemon (experimental)](#working-with-tt-daemon-experimental)
   * [Setting Tarantool configuration parameters via environment variables](#setting-tarantool-configuration-parameters-via-environment-variables)
+  * [Add current environment binaries location to the PATH variable](#add-current-environment-binaries-location-to-the-path-variable)
 * [Migration from older TT versions](doc/migration_from_older_versions.md)
 * [Commands](#commands)
 
@@ -578,6 +579,16 @@ support it. The name of a variable should have the following pattern:
 [box.cfg](https://www.tarantool.io/en/doc/latest/reference/configuration/#box-cfg-params-ref)
 parameter.
 
+### Add current environment binaries location to the PATH variable.
+
+You can add current environment binaries location to the PATH variable:
+
+``` console
+. <(tt env)
+```
+
+Also TARANTOOL_DIR variable is set.
+
 ## Commands
 
 Common description. For a detailed description, use `tt help command` .
@@ -611,6 +622,7 @@ Common description. For a detailed description, use `tt help command` .
 -   `instances` - show enabled applications.
 -   `binaries` - show a list of installed binaries and their versions.
 -   `cluster` - manage cluster configuration.
+-   `env` - add current environment binaries location to the PATH variable.
 
 [godoc-badge]: https://pkg.go.dev/badge/github.com/tarantool/tt.svg
 [godoc-url]: https://pkg.go.dev/github.com/tarantool/tt

cli/cmd/env.go

@@ -0,0 +1,34 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/tarantool/tt/cli/cmdcontext"
+	"github.com/tarantool/tt/cli/env"
+	"github.com/tarantool/tt/cli/modules"
+)
+
+// NewEnvCmd creates env command.
+func NewEnvCmd() *cobra.Command {
+	var envCmd = &cobra.Command{
+		Use:   "env",
+		Short: "Add current environment binaries location to the PATH variable",
+		Long: "Add current environment binaries location to the PATH variable.\n" +
+			"Also sets TARANTOOL_DIR variable.",
+		Run: func(cmd *cobra.Command, args []string) {
+			err := modules.RunCmd(&cmdCtx, cmd.CommandPath(), &modulesInfo,
+				internalEnvModule, args)
+			handleCmdErr(cmd, err)
+		},
+	}
+
+	return envCmd
+}
+
+// internalEnvModule is a default env module.
+func internalEnvModule(cmdCtx *cmdcontext.CmdCtx, args []string) error {
+	var err error
+	_, err = fmt.Print(env.CreateEnvString(cliOpts))
+	return err
+}

cli/cmd/root.go

@@ -163,6 +163,7 @@ func NewCmdRoot() *cobra.Command {
 		NewCfgCmd(),
 		NewInstancesCmd(),
 		NewBinariesCmd(),
+		NewEnvCmd(),
 	)
 	if err := injectCmds(rootCmd); err != nil {
 		panic(err.Error())

cli/env/env.go

@@ -0,0 +1,23 @@
+package env
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/tarantool/tt/cli/config"
+)
+
+// CreateEnvString generates environment variables for 'tarantool' and 'tt' installed using 'tt'.
+func CreateEnvString(cliOpts *config.CliOpts) string {
+	binDir := cliOpts.Env.BinDir
+	path := os.Getenv("PATH")
+	if !strings.Contains(path, binDir) {
+		path = binDir + ":" + path
+	}
+
+	tarantoolDir := filepath.Join(cliOpts.Env.IncludeDir, "include")
+
+	return fmt.Sprintf("export %s=%s\nexport %s=%s\n", "PATH", path, "TARANTOOL_DIR", tarantoolDir)
+}

cli/env/env_test.go

@@ -0,0 +1,18 @@
+package env
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarantool/tt/cli/configure"
+)
+
+func Test_CreateEnvString(t *testing.T) {
+	cliOpts := configure.GetDefaultCliOpts()
+	cliOpts.Env.BinDir = "foo/bin/"
+	cliOpts.Env.IncludeDir = "bar/include/"
+	assert.Contains(t, CreateEnvString(cliOpts),
+		"\nexport TARANTOOL_DIR=bar/include/include\n")
+	assert.Contains(t, CreateEnvString(cliOpts),
+		"export PATH=foo/bin/:")
+}

test/integration/env/test_env.py

@@ -0,0 +1,32 @@
+import os
+import re
+import subprocess
+
+from utils import config_name
+
+
+def test_env_output(tt_cmd, tmpdir):
+    configPath = os.path.join(tmpdir, config_name)
+    # Create test config
+    with open(configPath, 'w') as f:
+        f.write('env:\n  bin_dir:\n  inc_dir:\n')
+    binDir = str(tmpdir + "/bin")
+    tarantoolDir = "TARANTOOL_DIR=" + str(tmpdir + "/include/include")
+
+    env_cmd = [tt_cmd, "env"]
+    instance_process = subprocess.Popen(
+        env_cmd,
+        cwd=tmpdir,
+        stderr=subprocess.STDOUT,
+        stdout=subprocess.PIPE,
+        text=True
+    )
+
+    # Check that the process shutdowned correctly.
+    instance_process_rc = instance_process.wait()
+    assert instance_process_rc == 0
+
+    # Check output
+    output = instance_process.stdout.read()
+    assert re.search(tarantoolDir, output)
+    assert re.search(binDir, output)