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package shared
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/google/shlex"
)
func substituteCommand(cmd string) (string, error) {
var (
newCommand string
)
// Replace cmd with "/proc/self/exe" if "podman" or "docker" is being
// used. If "/usr/bin/docker" is provided, we also sub in podman.
// Otherwise, leave the command unchanged.
if cmd == "podman" || filepath.Base(cmd) == "docker" {
newCommand = "/proc/self/exe"
} else {
newCommand = cmd
}
// If cmd is an absolute or relative path, check if the file exists.
// Throw an error if it doesn't exist.
if strings.Contains(newCommand, "/") || strings.HasPrefix(newCommand, ".") {
res, err := filepath.Abs(newCommand)
if err != nil {
return "", err
}
if _, err := os.Stat(res); !os.IsNotExist(err) {
return res, nil
} else if err != nil {
return "", err
}
}
return newCommand, nil
}
// GenerateCommand takes a label (string) and converts it to an executable command
func GenerateCommand(command, imageName, name string) ([]string, error) {
var (
newCommand []string
)
if name == "" {
name = imageName
}
cmd, err := shlex.Split(command)
if err != nil {
return nil, err
}
prog, err := substituteCommand(cmd[0])
if err != nil {
return nil, err
}
newCommand = append(newCommand, prog)
for _, arg := range cmd[1:] {
var newArg string
switch arg {
case "IMAGE":
newArg = imageName
case "$IMAGE":
newArg = imageName
case "IMAGE=IMAGE":
newArg = fmt.Sprintf("IMAGE=%s", imageName)
case "IMAGE=$IMAGE":
newArg = fmt.Sprintf("IMAGE=%s", imageName)
case "NAME":
newArg = name
case "NAME=NAME":
newArg = fmt.Sprintf("NAME=%s", name)
case "NAME=$NAME":
newArg = fmt.Sprintf("NAME=%s", name)
case "$NAME":
newArg = name
default:
newArg = arg
}
newCommand = append(newCommand, newArg)
}
return newCommand, nil
}
// GenerateRunEnvironment merges the current environment variables with optional
// environment variables provided by the user
func GenerateRunEnvironment(name, imageName string, opts map[string]string) []string {
newEnv := os.Environ()
newEnv = append(newEnv, fmt.Sprintf("NAME=%s", name))
newEnv = append(newEnv, fmt.Sprintf("IMAGE=%s", imageName))
if opts["opt1"] != "" {
newEnv = append(newEnv, fmt.Sprintf("OPT1=%s", opts["opt1"]))
}
if opts["opt2"] != "" {
newEnv = append(newEnv, fmt.Sprintf("OPT2=%s", opts["opt2"]))
}
if opts["opt3"] != "" {
newEnv = append(newEnv, fmt.Sprintf("OPT3=%s", opts["opt3"]))
}
return newEnv
}
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