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exec.go
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exec.go
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package hookah
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
"syscall"
"time"
"github.com/hashicorp/go-multierror"
)
// HookExec represents a call to a hook
type HookExec struct {
RootDir string
Data io.ReadSeeker
InfoLog Logger
Stdout io.Writer
Stderr io.Writer
}
// GetPathExecs fetches the executable filenames for the given path
func (h *HookExec) GetPathExecs(owner, repo, event, action string) ([]string, []string, error) {
outfiles := []string{}
outErrHandlers := []string{}
var pathSets [][]string
if action == "" {
pathSets = [][]string{
{h.RootDir, owner, repo, event},
{filepath.Join(h.RootDir, "@@"), repo, event},
{filepath.Join(h.RootDir, owner, "@@"), event},
{filepath.Join(h.RootDir, "@@", "@@"), event},
}
} else {
pathSets = [][]string{
{h.RootDir, owner, repo, event, action},
{filepath.Join(h.RootDir, "@@"), repo, event, action},
{filepath.Join(h.RootDir, owner, "@@"), event, action},
{filepath.Join(h.RootDir, "@@", "@@"), event, action},
}
}
for _, paths := range pathSets {
workpath := ""
for _, path := range paths {
workpath = filepath.Join(workpath, path)
files, errHandlers, err := pathScan(workpath)
if err != nil {
return []string{}, []string{}, err
}
outfiles = append(outfiles, files...)
outErrHandlers = append(outErrHandlers, errHandlers...)
}
}
return outfiles, outErrHandlers, nil
}
// pathScan scans the given path for executable files
// returns a list of files and a list of error handlers
// error handlers are files that start with @@error.
func pathScan(path string) ([]string, []string, error) {
files := []string{}
errHandlers := []string{}
fs, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
return files, errHandlers, nil
}
return files, errHandlers, err
}
if fs.IsDir() {
d, err := os.Open(path)
defer d.Close()
if err != nil {
return files, errHandlers, err
}
fi, err := d.Readdir(-1)
if err != nil {
return files, errHandlers, err
}
// I don't think this is necessary but it makes the tests deterministic
sort.Slice(fi, func(i, j int) bool { return fi[i].Name() < fi[j].Name() })
for _, fi := range fi {
fpath := filepath.Join(path, fi.Name())
is, err := isExecFile(fpath)
if err != nil {
return files, errHandlers, err
}
if is {
if strings.HasPrefix(fi.Name(), "@@error.") {
errHandlers = append(errHandlers, filepath.Join(path, fi.Name()))
} else {
files = append(files, filepath.Join(path, fi.Name()))
}
}
}
} else if is, _ := isExecFile(path); is {
// fmt.Println(fs.Name(), fs.Size(), "bytes")
// files = append(files, filepath.Join(path, fs.Name()))
// this should be picked up on a different sweep
} else {
return files, errHandlers, errors.New("bad file mumbo jumbo")
}
return files, errHandlers, nil
}
// InfoLogf logs to the info logger if not nil
func (h *HookExec) InfoLogf(format string, v ...any) {
if h.InfoLog != nil {
h.InfoLog.Printf(format, v...)
}
}
func (h *HookExec) InfoLogln(msg string) {
if h.InfoLog != nil {
h.InfoLog.Println(msg)
}
}
// Exec triggers the execution of all scripts associated with the given Hook
func (h *HookExec) Exec(owner, repo, event, action string, timeout time.Duration, env ...string) error {
files, errHandlers, err := h.GetPathExecs(owner, repo, event, action)
if err != nil {
return err
}
if len(files) > 0 {
msg := fmt.Sprintf("executing hook scripts (%d) for %s/%s %s.%s", len(files), owner, repo, event, action)
msg = strings.TrimRight(msg, ".")
h.InfoLogln(msg)
}
var result *multierror.Error
for _, f := range files {
h.InfoLogf("beginning execution of %#v", f)
err := h.execFile(f, h.Data, timeout, env...)
if err != nil {
h.InfoLogf("exec error: %s", err)
for _, e := range errHandlers {
h.InfoLogf("beginning error handler execution of %#v", e)
env2 := append(env, getErrorHandlerEnv(f, err)...)
err2 := h.execFile(e, h.Data, timeout, env2...)
result = multierror.Append(result, err2)
}
}
result = multierror.Append(result, err)
}
return result.ErrorOrNil()
}
func getErrorHandlerEnv(f string, err error) []string {
env := []string{
"HOOKAH_EXEC_ERROR_FILE=" + f,
"HOOKAH_EXEC_ERROR=" + err.Error(),
}
if exiterr, ok := err.(*exec.ExitError); ok {
if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
env = append(env, fmt.Sprintf("HOOKAH_EXEC_EXIT_STATUS=%d", status.ExitStatus()))
}
}
return env
}
func (h *HookExec) execFile(f string, data io.ReadSeeker, timeout time.Duration, env ...string) error {
cmd := exec.Command(f)
if h.Stdout != nil {
cmd.Stdout = h.Stdout
} else {
cmd.Stdout = os.Stdout
}
if h.Stderr != nil {
cmd.Stderr = h.Stderr
} else {
cmd.Stderr = os.Stderr
}
cmd.Env = append(os.Environ(), env...)
stdin, err := cmd.StdinPipe()
if err != nil {
return err
}
defer stdin.Close()
err = cmd.Start()
if err != nil {
return err
}
_, err = data.Seek(0, 0)
if err != nil {
return err
}
_, err = io.Copy(stdin, data)
if err != nil {
return err
}
stdin.Close()
timer := time.AfterFunc(timeout, func() {
cmd.Process.Kill()
})
err = cmd.Wait()
timer.Stop()
return err
}
// todo: base this on OS
func isExecFile(fss ...string) (bool, error) {
if len(fss) > 10 {
paths := []string{}
for _, f := range fss {
paths = append(paths, f)
}
return false, fmt.Errorf("maximum symlink depth exceeded: %s", strings.Join(paths, " -> "))
}
if len(fss) == 0 {
return false, errors.New("no file info provided")
}
fs := fss[len(fss)-1]
fi, err := os.Stat(fs)
if err != nil {
return false, err
}
mode := fi.Mode()
if mode.IsRegular() && mode|0111 == mode {
return true, nil
}
if mode&os.ModeSymlink != 0 {
link, err := os.Readlink(fi.Name())
if err != nil {
return false, err
}
fss = append(fss, link)
return isExecFile(fss...)
}
return false, nil
}