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system.go
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system.go
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package clients
import (
"bufio"
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
"os/exec"
"runtime"
"strings"
"time"
"github.com/docker/docker/api/types"
)
const (
Red = "\033[1;31m%s\033[0m"
Green = "\033[1;32m%s\033[0m"
Yellow = "\033[1;33m%s\033[0m"
)
// System handles interactions between Shipyard and the OS
type System interface {
OpenBrowser(string) error
Preflight() (string, error)
CheckVersion(string) (string, bool)
PromptInput(in io.Reader, out io.Writer, message string) string
}
// SystemImpl is a concrete implementation of the System interface
type SystemImpl struct{}
// OpenBrowser opens a URI in a new browser window
func (b *SystemImpl) OpenBrowser(uri string) error {
openCommand := ""
args := []string{}
switch runtime.GOOS {
case "linux":
openCommand = "xdg-open"
case "darwin":
openCommand = "open"
case "windows":
openCommand = "rundll32"
args = append(args, "url.dll,FileProtocolHandler")
}
args = append(args, uri)
cmd := exec.Command(openCommand, args...)
// we need to enable a timeout for this command as it can hang on WSL2
doneChan := make(chan struct{})
timerChan := time.After(10 * time.Second)
var err error
go func() {
err = cmd.Run()
}()
select {
case <-timerChan:
err = fmt.Errorf("Timeout opening browser window")
case <-doneChan:
}
return err
}
// Preflight checks that the required software is installed and is
// working correctly
func (b *SystemImpl) Preflight() (string, error) {
dockerPass := true
gitPass := true
errors := ""
output := ""
// check docker
if checkDocker() != nil {
output += fmt.Sprintf(" [ %s ] Docker\n", fmt.Sprintf(Red, " ERROR "))
errors += "* Unable to connect to Docker, ensure Docker is installed and running.\n"
dockerPass = false
} else {
output += fmt.Sprintf(" [ %s ] Docker\n", fmt.Sprintf(Green, " OK "))
}
if checkGit() != nil {
output += fmt.Sprintf(" [ %s ] Git\n", fmt.Sprintf(Red, " ERROR "))
errors += "* Unable to find 'git' command, ensure Git is installed. Shipyard uses the git CLI to download blueprints.\n"
gitPass = false
} else {
output += fmt.Sprintf(" [ %s ] Git\n", fmt.Sprintf(Green, " OK "))
}
if runtime.GOOS == "linux" {
if checkXdgOpen() != nil {
output += fmt.Sprintf(" [ %s ] xdg-open\n", fmt.Sprintf(Yellow, "WARNING"))
errors += "* Unable to find 'xdg-open' command, ensure 'xdg-open' is installed. Shipyard uses the 'xdg-open' to open browser windows.\n"
} else {
output += fmt.Sprintf(" [ %s ] xdg-open\n", fmt.Sprintf(Green, " OK "))
}
}
if !dockerPass || !gitPass {
return fmt.Sprintf("%s\n\n%s", output, errors), fmt.Errorf("Errors preflighting system")
}
return output, nil
}
// CheckVersion checks the current version against the latest online version
// if an update is required the function returns a string with the upgrade text
// and a boolean value set to false.
// If no upgrade is reuquired then the boolean will be set to true and the string
// will be empty.
func (b *SystemImpl) CheckVersion(current string) (string, bool) {
// try and get the latest version
resp, err := http.DefaultClient.Get("https://shipyard.run/latest")
if err != nil || resp.StatusCode != http.StatusOK {
// if we fail just return
return "", true
}
defer resp.Body.Close()
// get the version
d, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", true
}
ver := strings.TrimSpace(string(d))
// check the version
if current != ver {
return fmt.Sprintf(
fmt.Sprintf("\033[1;31m%s\033[0m", updateText),
ver, current,
), false
}
return "", true
}
// PromptInput prompts the user for input in the CLI and returns the
// entered value
func (b *SystemImpl) PromptInput(in io.Reader, out io.Writer, message string) string {
out.Write([]byte(message))
scanner := bufio.NewScanner(in)
scanner.Scan()
return scanner.Text()
}
var updateText = `
########################################################
SHIPYARD UPDATE
########################################################
The current version of shipyard is "%s", you have "%s".
To upgrade Shipyard please use your package manager or,
see the documentation at:
https://shipyard.run/docs/install for other options.
`
func checkDocker() error {
d, err := NewDocker()
if err != nil {
return err
}
_, err = d.ContainerList(context.Background(), types.ContainerListOptions{All: true})
if err != nil {
return err
}
return nil
}
func checkGit() error {
_, err := exec.LookPath("git")
return err
}
func checkXdgOpen() error {
_, err := exec.LookPath("xdg-open")
return err
}