dpkg

dpkg is a Go package for managing Debian packages. It provides functionalities to read and parse .deb files, list installed packages, and filter packages based on their names.

Installation

To install the dpkg package, use the following command:

go get github.com/go-apt/dpkg

Main Functions

Reading the Contents of a .deb File

To read the contents of a .deb file and retrieve its metadata, use the Info function:

// Create a new instance of the Dpkg struct
d := dpkg.NewDpkg()

// Read the contents of the .deb file
pkg, err := d.Info("/path/to/debFile")
if err != nil {
    fmt.Fprintf(os.Stderr, "Error: %v\n", err)
    os.Exit(1)
}

// Print package name from the .deb file
fmt.Printf("Package from .deb file: %s\n", pkg.Fields["Package"])

Validating a .deb File

To validate if a file is a valid .deb package, use the IsDebFile function:

debFile := "/path/to/debFile"

// Validate if the file is a .deb package
if !d.IsDebFile(debFile) {
    fmt.Fprintf(os.Stderr, "Error: %s is not a valid .deb file\n", debFile)
    os.Exit(1)
}

fmt.Printf("%s is a valid .deb file\n", debFile)

Listing Installed Packages

To list the installed packages and retrieve their metadata, use the List function:

// Create a new instance of the Dpkg struct
d := dpkg.NewDpkg()

// Read the contents of the /var/lib/dpkg/status file
packages, err := d.List()
if err != nil {
    fmt.Fprintf(os.Stderr, "Error: %v\n", err)
    os.Exit(1)
}

// Print package names from installed packages
for _, p := range packages {
    fmt.Printf("Package from dpkg status file: %s\n", p.Fields["Package"])
}

Filtering Packages by Name

To filter packages by name, use the ListGrep function:

// Create a new instance of the Dpkg struct
d := dpkg.NewDpkg()

// Filter packages by name
filteredPackages, err := d.ListGrep("apt")
if err != nil {
    fmt.Fprintf(os.Stderr, "Error: %v\n", err)
    os.Exit(1)
}

// Print package names from filtered packages
for _, p := range filteredPackages {
    fmt.Printf("Packages from Grep search: %s\n", p.Fields["Package"])
}