Add info command

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
+}

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{