src/pkg/dkms/uninstall.go

package dkms

import (
	"cos.googlesource.com/cos/tools.git/src/pkg/utils"
	"fmt"
	"github.com/golang/glog"
	"os"
)

// Uninstall removes all of the installed modules of a DKMS package from the
// install tree.
func Uninstall(pkg *Package) error {
	if !IsInstalled(pkg) {
		glog.Info("module is not installed; skipping removal from install tree")
		return nil
	}

	for _, module := range pkg.Config.Modules {
		destModulePath := module.DestPath()
		glog.Info("removing installed module", destModulePath)
		if err := os.Remove(destModulePath); err != nil {
			if os.IsNotExist(err) {
				glog.Warningf("could not find module at %s", destModulePath, pkg.Name)
			} else {
				return fmt.Errorf("error removing module %s", destModulePath)
			}
		}
	}

	// Unintuitively, Dell DKMS does POST_REMOVE after uninstall, not after remove.
	if pkg.Config.PostRemove != "" {
		if err := utils.RunCommandString(pkg.SourceDir(), pkg.Config.PostRemove, os.Stderr); err != nil {
			return fmt.Errorf("failed to run post-remove script: %v", err)
		}
	}

	return nil
}