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//go:build !windows
package subprocess
import (
"fmt"
"io"
"os"
"gopkg.in/yaml.v2"
)
// NewProcess is a constructor for a process object. Represents a process with argument config.
// stdoutPath and stderrPath arguments are optional. Returns an address to process.
func NewProcess(name string, args []string, stdoutPath string, stderrPath string) (*Process, error) {
var stdout, stderr io.WriteCloser
var err error
// Setup output capture.
if stdoutPath != "" {
stdout, err = os.Create(stdoutPath)
if err != nil {
return nil, fmt.Errorf("Unable to open stdout file %q: %w", stdoutPath, err)
}
}
if stderrPath == stdoutPath {
stderr = stdout
} else if stderrPath != "" {
stderr, err = os.Create(stderrPath)
if err != nil {
return nil, fmt.Errorf("Unable to open stderr file %q: %w", stderrPath, err)
}
}
p := NewProcessWithFds(name, args, nil, stdout, stderr)
p.closeFds = true
return p, nil
}
// NewProcessWithFds is a constructor for a process object. Represents a process with argument config. Returns an address to process.
func NewProcessWithFds(name string, args []string, stdin io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) *Process {
proc := Process{
Name: name,
Args: args,
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
}
return &proc
}
// ImportProcess imports a saved process into a subprocess object.
func ImportProcess(path string) (*Process, error) {
dat, err := os.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("Unable to read PID file %q: %w", path, err)
}
proc := Process{}
err = yaml.Unmarshal(dat, &proc)
if err != nil {
return nil, fmt.Errorf("Unable to parse YAML in PID file %q: %w", path, err)
}
return &proc, nil
}
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