util: add flatpak introspection utilities (#1234)

ci: run apt as sudo

ci: fix flatpak remote in runner

ci: flatpak install steps in runner

ci: specific version of freedesktop

ci: freedesktop install perms

core/internal/utils/flatpak.go

@@ -0,0 +1,78 @@
+package utils
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+	"strings"
+)
+
+func FlatpakInPath() bool {
+	_, err := exec.LookPath("flatpak")
+	return err == nil
+}
+
+func FlatpakExists(name string) bool {
+	if !FlatpakInPath() {
+		return false
+	}
+
+	cmd := exec.Command("flatpak", "info", name)
+	err := cmd.Run()
+	return err == nil
+}
+
+func FlatpakSearchBySubstring(substring string) bool {
+	if !FlatpakInPath() {
+		return false
+	}
+
+	cmd := exec.Command("flatpak", "list", "--app")
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+
+	if err := cmd.Run(); err != nil {
+		return false
+	}
+
+	out := stdout.String()
+
+	for line := range strings.SplitSeq(out, "\n") {
+		fields := strings.Fields(line)
+		if len(fields) > 1 {
+			id := fields[1]
+			idParts := strings.Split(id, ".")
+			// We are assuming that the last part of the ID is
+			// the package name we're looking for. This might
+			// not always be true, some developers use arbitrary
+			// suffixes.
+			if len(idParts) > 0 && idParts[len(idParts)-1] == substring {
+				cmd := exec.Command("flatpak", "info", id)
+				err := cmd.Run()
+				return err == nil
+			}
+		}
+	}
+	return false
+}
+
+func FlatpakInstallationDir(name string) (string, error) {
+	if !FlatpakInPath() {
+		return "", errors.New("flatpak not found in PATH")
+	}
+
+	cmd := exec.Command("flatpak", "info", "--show-location", name)
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+
+	if err := cmd.Run(); err != nil {
+		return "", errors.New("flatpak not installed: " + name)
+	}
+
+	location := strings.TrimSpace(stdout.String())
+	if location == "" {
+		return "", errors.New("installation directory not found for: " + name)
+	}
+
+	return location, nil
+}