83 lines
1.7 KiB
Go
83 lines
1.7 KiB
Go
package initialize
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import (
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"bufio"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"github.com/coreos/coreos-cloudinit/system"
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)
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const locksmithUnit = "locksmithd.service"
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// addStrategy creates an `/etc/coreos/update.conf` file with the requested
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// strategy via rewriting the file on disk or by starting from
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// `/usr/share/coreos/update.conf`.
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func addStrategy(strategy string, root string) error {
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etcUpdate := path.Join(root, "etc", "coreos", "update.conf")
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usrUpdate := path.Join(root, "usr", "share", "coreos", "update.conf")
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tmp, err := ioutil.TempFile(path.Join(root, "etc", "coreos"), ".update.conf")
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if err != nil {
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return err
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}
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err = tmp.Chmod(0644)
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if err != nil {
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return err
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}
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conf, err := os.Open(etcUpdate)
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if os.IsNotExist(err) {
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conf, err = os.Open(usrUpdate)
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if err != nil {
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return err
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}
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}
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scanner := bufio.NewScanner(conf)
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sawStrat := false
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stratLine := "STRATEGY="+strategy
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(line, "STRATEGY=") {
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line = stratLine
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sawStrat = true
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}
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fmt.Fprintln(tmp, line)
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if err := scanner.Err(); err != nil {
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return err
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}
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}
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if !sawStrat {
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fmt.Fprintln(tmp, stratLine)
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}
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return os.Rename(tmp.Name(), etcUpdate)
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}
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// WriteLocksmithEnvironment writes a drop-in unit for locksmith
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func WriteLocksmithEnvironment(strategy string, root string) error {
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cmd := "restart"
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if strategy == "off" {
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err := system.MaskUnit(locksmithUnit, root)
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if err != nil {
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return err
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}
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cmd = "stop"
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} else {
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return addStrategy(strategy, root)
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}
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if err := system.DaemonReload(); err != nil {
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return err
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}
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if _, err := system.RunUnitCommand(cmd, locksmithUnit); err != nil {
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return err
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}
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return nil
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}
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