Add info command

build.go

@@ -66,6 +66,18 @@ type BuildVars struct {
 	Sources       []string `sh:"sources"`
 	Checksums     []string `sh:"checksums"`
 	Backup        []string `sh:"backup"`
+	Scripts       Scripts  `sh:"scripts"`
+}
+
+type Scripts struct {
+	PreInstall  string `sh:"preinstall"`
+	PostInstall string `sh:"postinstall"`
+	PreRemove   string `sh:"preremove"`
+	PostRemove  string `sh:"postinstall"`
+	PreUpgrade  string `sh:"preupgrade"`
+	PostUpgrade string `sh:"postupgrade"`
+	PreTrans    string `sh:"pretrans"`
+	PostTrans   string `sh:"posttrans"`
 }
 
 func buildCmd(c *cli.Context) error {
@@ -221,6 +233,8 @@ func buildPackage(ctx context.Context, script string, mgr manager.Manager) ([]st
 		},
 	}
 
+	setScripts(&vars, pkgInfo, filepath.Dir(script))
+
 	if pkgInfo.Arch == "arm" {
 		pkgInfo.Arch = checkARMVariant()
 	}
@@ -393,6 +407,42 @@ func checkARMVariant() string {
 	}
 }
 
+func setScripts(vars *BuildVars, info *nfpm.Info, scriptDir string) {
+	if vars.Scripts.PreInstall != "" {
+		info.Scripts.PreInstall = filepath.Join(scriptDir, vars.Scripts.PreInstall)
+	}
+
+	if vars.Scripts.PostInstall != "" {
+		info.Scripts.PostInstall = filepath.Join(scriptDir, vars.Scripts.PostInstall)
+	}
+
+	if vars.Scripts.PreRemove != "" {
+		info.Scripts.PreRemove = filepath.Join(scriptDir, vars.Scripts.PreRemove)
+	}
+
+	if vars.Scripts.PostRemove != "" {
+		info.Scripts.PostRemove = filepath.Join(scriptDir, vars.Scripts.PostRemove)
+	}
+
+	if vars.Scripts.PreUpgrade != "" {
+		info.ArchLinux.Scripts.PreUpgrade = filepath.Join(scriptDir, vars.Scripts.PreUpgrade)
+		info.APK.Scripts.PreUpgrade = filepath.Join(scriptDir, vars.Scripts.PreUpgrade)
+	}
+
+	if vars.Scripts.PostUpgrade != "" {
+		info.ArchLinux.Scripts.PostUpgrade = filepath.Join(scriptDir, vars.Scripts.PostUpgrade)
+		info.APK.Scripts.PostUpgrade = filepath.Join(scriptDir, vars.Scripts.PostUpgrade)
+	}
+
+	if vars.Scripts.PreTrans != "" {
+		info.RPM.Scripts.PreTrans = filepath.Join(scriptDir, vars.Scripts.PreTrans)
+	}
+
+	if vars.Scripts.PostTrans != "" {
+		info.RPM.Scripts.PostTrans = filepath.Join(scriptDir, vars.Scripts.PostTrans)
+	}
+}
+
 func uniq(ss ...*[]string) {
 	for _, s := range ss {
 		slices.Sort(*s)

info.go

@@ -0,0 +1,93 @@
+/*
+ * LURE - Linux User REpository
+ * Copyright (C) 2022 Arsen Musayelyan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import (
+	"os"
+
+	"github.com/urfave/cli/v2"
+	"go.arsenm.dev/lure/distro"
+	"go.arsenm.dev/lure/internal/shutils/decoder"
+	"gopkg.in/yaml.v3"
+	"mvdan.cc/sh/v3/expand"
+	"mvdan.cc/sh/v3/interp"
+	"mvdan.cc/sh/v3/syntax"
+)
+
+func infoCmd(c *cli.Context) error {
+	args := c.Args()
+	if args.Len() < 1 {
+		log.Fatalf("Command info expected at least 1 argument, got %d", args.Len()).Send()
+	}
+
+	info, err := distro.ParseOSRelease(c.Context)
+	if err != nil {
+		log.Fatal("Error parsing os-release").Err(err).Send()
+	}
+
+	found, err := findPkg(args.First())
+	if err != nil {
+		log.Fatal("Error finding package").Err(err).Send()
+	}
+
+	// if multiple are matched, only use the first one
+	script := found[0]
+
+	fl, err := os.Open(script)
+	if err != nil {
+		log.Fatal("Error opening script").Err(err).Send()
+	}
+
+	file, err := syntax.NewParser().Parse(fl, "lure.sh")
+	if err != nil {
+		log.Fatal("Error parsing script").Err(err).Send()
+	}
+
+	fl.Close()
+
+	env := genBuildEnv(info)
+
+	runner, err := interp.New(
+		interp.Env(expand.ListEnviron(env...)),
+		interp.StdIO(os.Stdin, os.Stdout, os.Stderr),
+	)
+	if err != nil {
+		log.Fatal("Error creating runner").Err(err).Send()
+	}
+
+	err = runner.Run(c.Context, file)
+	if err != nil {
+		log.Fatal("Error running script").Err(err).Send()
+	}
+
+	dec := decoder.New(info, runner)
+
+	var vars BuildVars
+	err = dec.DecodeVars(&vars)
+	if err != nil {
+		log.Fatal("Error decoding script variables").Err(err).Send()
+	}
+
+	err = yaml.NewEncoder(os.Stdout).Encode(vars)
+	if err != nil {
+		log.Fatal("Error encoding script variables").Err(err).Send()
+	}
+
+	return nil
+}

internal/shutils/decoder/decoder.go

@@ -22,7 +22,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io"
 	"reflect"
 	"runtime"
 	"strings"
@@ -37,13 +36,12 @@ import (
 
 var ErrInvalidType = errors.New("val must be a pointer to a struct")
 
-type NotFoundError struct {
-	stype string
-	name  string
+type VarNotFoundError struct {
+	name string
 }
 
-func (nfe NotFoundError) Error() string {
-	return "required " + nfe.stype + " '" + nfe.name + "' could not be found"
+func (nfe VarNotFoundError) Error() string {
+	return "required variable '" + nfe.name + "' could not be found"
 }
 
 // Decoder provides methods for decoding variable values
@@ -63,7 +61,7 @@ func New(info *distro.OSRelease, runner *interp.Runner) *Decoder {
 func (d *Decoder) DecodeVar(name string, val any) error {
 	variable := d.getVar(name)
 	if variable == nil {
-		return NotFoundError{"variable", name}
+		return VarNotFoundError{name}
 	}
 
 	dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
@@ -128,7 +126,7 @@ func (d *Decoder) DecodeVars(val any) error {
 
 		newVal := reflect.New(field.Type())
 		err := d.DecodeVar(name, newVal.Interface())
-		if _, ok := err.(NotFoundError); ok && !required {
+		if _, ok := err.(VarNotFoundError); ok && !required {
 			continue
 		} else if err != nil {
 			return err
@@ -158,31 +156,6 @@ func (d *Decoder) GetFunc(name string) (ScriptFunc, bool) {
 	}, true
 }
 
-// WriteFunc writes the contents of a bash function to w.
-func (d *Decoder) WriteFunc(name string, w io.Writer) error {
-	fn := d.getFunc(name)
-	if fn == nil {
-		return NotFoundError{"function", name}
-	}
-
-	printer := syntax.NewPrinter()
-
-	// Print individual statements instead of the entire block
-	block := fn.Cmd.(*syntax.Block)
-	for _, stmt := range block.Stmts {
-		err := printer.Print(w, stmt)
-		if err != nil {
-			return err
-		}
-		_, err = io.WriteString(w, "\n")
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
 func (d *Decoder) getFunc(name string) *syntax.Stmt {
 	names := d.genPossibleNames(name)
 	for _, fnName := range names {

main.go

@@ -64,6 +64,12 @@ func main() {
 				Aliases: []string{"up"},
 				Action:  upgradeCmd,
 			},
+			{
+				Name:    "info",
+				Usage:   "Print information about a package",
+				Aliases: []string{"up"},
+				Action:  infoCmd,
+			},
 			{
 				Flags: []cli.Flag{
 					&cli.StringFlag{