Carlos Florêncio
78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
//go:build unix
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package subproc
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import (
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"errors"
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"fmt"
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"os/exec"
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"syscall"
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"time"
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)
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type gitLifecycleHandle struct {
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pid int
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}
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func prepareGitLifecycleCommand(cmd *exec.Cmd) error {
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if cmd.SysProcAttr == nil {
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cmd.SysProcAttr = &syscall.SysProcAttr{}
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}
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attr := *cmd.SysProcAttr
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if attr.Setctty || attr.Foreground || attr.Ctty != 0 {
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return errors.New("Git command requests a controlling terminal")
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}
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if attr.Setpgid || attr.Pgid != 0 {
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return errors.New("Git command requests caller-owned process-group attributes")
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}
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// setsid creates a new session and process group whose ID is the child
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// PID. Combining it with Setpgid is rejected by the kernel on several
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// Unix platforms, so the session is the ownership boundary we signal.
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attr.Setsid = true
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attr.Setpgid = false
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attr.Pgid = 0
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cmd.SysProcAttr = &attr
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setGitWaitDelay(cmd)
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return nil
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}
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func installGitLifecycle(cmd *exec.Cmd) (gitLifecycleHandle, error) {
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return gitLifecycleHandle{pid: cmd.Process.Pid}, nil
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}
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func cancelGitLifecycle(lifecycle gitLifecycleHandle) error {
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if lifecycle.pid <= 0 {
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return nil
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}
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if err := syscall.Kill(-lifecycle.pid, syscall.SIGKILL); err != nil && !errors.Is(err, syscall.ESRCH) {
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return fmt.Errorf("kill Git process group %d: %w", lifecycle.pid, err)
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}
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return nil
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}
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func releaseGitLifecycle(lifecycle gitLifecycleHandle) error {
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// A Git leader can exit while a helper or hook still owns an inherited
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// output pipe. Terminate the owned process group on every terminal path so
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// normal exit cannot leave descendants behind until the next cancellation.
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return cancelGitLifecycle(lifecycle)
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}
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func abortStartedGit(cmd *exec.Cmd) error {
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if cmd == nil || cmd.Process == nil {
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return nil
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}
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_ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
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return waitForStartedGit(cmd)
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}
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func waitForStartedGit(cmd *exec.Cmd) error {
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done := make(chan error, 1)
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go func() { done <- cmd.Wait() }()
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select {
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case err := <-done:
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return err
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case <-time.After(gitCleanupLimit):
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return fmt.Errorf("Git process %d was not reaped after startup failure", cmd.Process.Pid)
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}
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}
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