43 lines
1.0 KiB
Go
43 lines
1.0 KiB
Go
package main
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import (
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"syscall"
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"bytes"
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"fmt"
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"os"
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"io/ioutil"
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)
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// cmdline looks like this: /bin/bash \0 /path/to/gocryptfs \0 --zerokey \0 ...
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const (
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WRAPPER_PREFIX = "/bin/bash\000"
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WRAPPER_CONTAINS = "gocryptfs\000"
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)
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// Send USR1 to the "gocryptfs" wrapper shell script. This notifies it that the
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// mounting has completed sucessfully.
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//
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// Checks /proc/$PPID/cmdline to make sure we do not kill an unrelated process.
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func sendSig() {
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ppid := os.Getppid()
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fn := fmt.Sprintf("/proc/%d/cmdline", ppid)
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cmdline, err := ioutil.ReadFile(fn)
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if err != nil {
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fmt.Printf("sendSig: ReadFile: %v\n", err)
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return
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}
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if bytes.HasPrefix(cmdline, []byte(WRAPPER_PREFIX)) && bytes.Contains(cmdline, []byte(WRAPPER_CONTAINS)) {
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p, err := os.FindProcess(ppid)
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if err != nil {
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fmt.Printf("sendSig: FindProcess: %v\n", err)
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return
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}
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err = p.Signal(syscall.SIGUSR1)
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if err != nil {
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fmt.Printf("sendSig: Signal: %v\n", err)
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}
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} else {
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fmt.Printf("Not running under the gocryptfs wrapper - will not daemonize\n")
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}
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}
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