Unix

unix is a Go library for managing cron jobs, Nginx server blocks, systemd services, and system information. It provides a simple and consistent API for creating, installing, and managing these services.

Installation

To install the library, use the following command:

go get github.com/go-universal/unix

Features

• Cron Jobs: Manage cron schedules with timezone support.
• Nginx Server Blocks: Create and manage Nginx server configurations.
• Systemd Services: Manage systemd services for Linux systems.
• System Information: Retrieve system information such as CPU, memory, disk, and network stats.
• Template Engine: Use a lightweight template engine for string replacements.

Cron Jobs

The Cron interface provides methods for scheduling and managing cron jobs.

• Raw() string: Returns the raw cron expression.
• Exists() (bool, error): Checks whether the cron job is installed.
• Install() (bool, error): Installs the cron job. Returns false if it already exists.
• Uninstall() error: Removes the cron job.

Options

• WithTimezone(tz *CronTZ) Option sets the timezone for the cron schedule.
• RunAtReboot() Option: Schedules the cron to run at system reboot.
• RunAtReboot() Option: Schedules the cron to run at system reboot.
• RunYearly() Option: Schedules the cron to run once a year (January 1st at midnight).
• RunMonthly() Option: Schedules the cron to run once a month (1st day at midnight).
• RunWeekly(wd Weekday) Option: Schedules the cron to run once a week on the specified weekday.
• RunDaily() Option: Schedules the cron to run once a day at midnight.
• EveryXMinutes(minutes int) Option: Runs the cron every X minutes.
• EveryXHours(hours int) Option: Runs the cron every X hours.
• Minute(minute int) Option: Sets the specific minute for the cron schedule.
• Hour(hour int) Option: Sets the specific hour for the cron schedule.
• DayOfMonth(day int) Option: Sets the specific day of the month for the cron schedule.
• Month(month int) Option: Sets the specific month for the cron schedule.
• DayOfWeek(wd Weekday) Option: Sets the specific day of the week for the cron schedule.

package main

import (
    "fmt"
    "github.com/go-universal/unix/cron"
)

func main() {
    job := cron.New("echo 'Hello, World!'", cron.RunDaily(), cron.Hour(2), cron.Minute(30))

    if installed, err := job.Install(); err != nil {
        fmt.Println("Error installing cron job:", err)
    } else if installed {
        fmt.Println("Cron job installed successfully")
    } else {
        fmt.Println("Cron job already exists")
    }
}

Nginx Server Blocks

The ServerBlock and ReverseProxy interfaces provide methods for managing Nginx server configurations.

• Exists() (bool, error): Checks if the configuration file exists.
• Enabled() (bool, error): Checks if the configuration is enabled.
• Disable() error: Disables the configuration.
• Enable() error: Enables the configuration.
• Install(override bool) (bool, error): Installs the configuration. Returns false if it already exists and override is false.
• Uninstall() error: Removes the configuration.

package main

import (
    "fmt"
    "github.com/go-universal/unix/nginx"
)

func main() {
    proxy := nginx.NewReverseProxy("example", "8080", []string{"example.com", "www.example.com"})

    if installed, err := proxy.Install(true); err != nil {
        fmt.Println("Error installing reverse proxy:", err)
    } else if installed {
        fmt.Println("Reverse proxy installed successfully")
    } else {
        fmt.Println("Reverse proxy already exists")
    }
}

Systemd Services

The SystemdService interface provides methods for managing systemd services.

• Exists() bool: Checks if the service exists.
• Enabled() bool: Checks if the service is enabled.
• Disable() error: Disables the service.
• Install(override bool) (bool, error): Installs the service. Returns false if it already exists and override is false.
• Uninstall() error: Removes the service.

package main

import (
    "fmt"
    "github.com/go-universal/unix/systemd"
)

func main() {
    service := systemd.NewService("example-service", "/path/to/root", "example-command")

    if installed, err := service.Install(true); err != nil {
        fmt.Println("Error installing systemd service:", err)
    } else if installed {
        fmt.Println("Systemd service installed successfully")
    } else {
        fmt.Println("Systemd service already exists")
    }
}

System Information

The sysinfo package provides methods for retrieving system information.

• CPUInfo() (cores int, used, free float64, err error): Retrieves CPU information.
• MemoryInfo() (total, used, free uint64, err error): Retrieves memory statistics.
• DiskInfo() (total, used, free uint64, err error): Retrieves disk usage statistics.
• NetworkInfo() (sent, recv uint64, err error): Retrieves network I/O statistics.
• Uptime() (time.Duration, error): Retrieves system uptime.
• UptimeParts() (days, hours, minutes uint64, err error): Retrieves uptime as days, hours, and minutes.
• UptimeI18n(dayTitle, hourTitle, minuteTitle, separator string) (string, error): Retrieves localized uptime.

package main

import (
    "fmt"
    "github.com/go-universal/unix/sysinfo"
)

func main() {
    total, used, free, err := sysinfo.MemoryInfo()
    if err != nil {
        fmt.Println("Error retrieving memory info:", err)
        return
    }

    fmt.Printf("Total: %d, Used: %d, Free: %d\n", total, used, free)
}

Utility Functions

IsSudo

Checks if the program is running with sudo privileges.

package main

import (
    "fmt"
    "github.com/go-universal/unix"
)

func main() {
    if unix.IsSudo() {
        fmt.Println("Running with sudo privileges")
    } else {
        fmt.Println("Not running with sudo privileges")
    }
}

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License

This project is licensed under the ISC License. See the LICENSE file for details.