[WIP] v0.7.0

pkg/pkgman/apt/apt.go

@@ -2,6 +2,8 @@ package apt
 
 import (
 	"fmt"
+	"regexp"
+	"strings"
 
 	"git.andrewnw.xyz/CyberShell/backy/pkg/pkgman/pkgcommon"
 )
@@ -10,6 +12,7 @@ import (
 type AptManager struct {
 	useAuth     bool   // Whether to use an authentication command
 	authCommand string // The authentication command, e.g., "sudo"
+	Parser      pkgcommon.PackageParser
 }
 
 // DefaultAuthCommand is the default command used for authentication.
@@ -62,6 +65,14 @@ func (a *AptManager) Upgrade(pkg, version string) (string, []string) {
 	return baseCmd, baseArgs
 }
 
+// CheckVersion returns the command and arguments for checking the info of a specific package.
+func (a *AptManager) CheckVersion(pkg, version string) (string, []string) {
+	baseCmd := a.prependAuthCommand("apt-cache")
+	baseArgs := []string{"policy", pkg}
+
+	return baseCmd, baseArgs
+}
+
 // UpgradeAll returns the command and arguments for upgrading all packages.
 func (a *AptManager) UpgradeAll() (string, []string) {
 	baseCmd := a.prependAuthCommand(DefaultPackageCommand)
@@ -93,3 +104,32 @@ func (a *AptManager) SetUseAuth(useAuth bool) {
 func (a *AptManager) SetAuthCommand(authCommand string) {
 	a.authCommand = authCommand
 }
+
+// SetPackageParser assigns a PackageParser.
+func (a *AptManager) SetPackageParser(parser pkgcommon.PackageParser) {
+	a.Parser = parser
+}
+
+// Parse parses the apt-cache policy output to extract Installed and Candidate versions.
+func (a *AptManager) Parse(output string) (*pkgcommon.PackageVersion, error) {
+	// Check for error message in the output
+	if strings.Contains(output, "Unable to locate package") {
+		return nil, fmt.Errorf("error: %s", strings.TrimSpace(output))
+	}
+
+	reInstalled := regexp.MustCompile(`Installed:\s*([^\s]+)`)
+	reCandidate := regexp.MustCompile(`Candidate:\s*([^\s]+)`)
+
+	installedMatch := reInstalled.FindStringSubmatch(output)
+	candidateMatch := reCandidate.FindStringSubmatch(output)
+
+	if len(installedMatch) < 2 || len(candidateMatch) < 2 {
+		return nil, fmt.Errorf("failed to parse Installed or Candidate versions from apt output. check package name")
+	}
+
+	return &pkgcommon.PackageVersion{
+		Installed: strings.TrimSpace(installedMatch[1]),
+		Candidate: strings.TrimSpace(candidateMatch[1]),
+		Match:     installedMatch[1] == candidateMatch[1],
+	}, nil
+}