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authorJakob Unterwurzacher2016-10-26 11:19:14 +0200
committerJakob Unterwurzacher2016-10-28 21:18:36 +0200
commit4cc64c2c9579283da6a997c425e986dfe014c56d (patch)
treed24f5bb397fa5486d0ee105ee23eb4987918d31b
parenta08d55f42d5b11e265a8617bee16babceebfd026 (diff)
main: redirect panics to /tmp/gocryptfs_panic.NNNN
Redirect stdout and stderr to /tmp/gocryptfs_paniclog.NNNNNN instead of closing them so users have a chance to get the backtrace on a panic. This only applies if "-nosyslog" is NOT set. Panics will go to terminal as usual if it is.
-rw-r--r--mount.go28
1 files changed, 26 insertions, 2 deletions
diff --git a/mount.go b/mount.go
index c207bdd..37f179a 100644
--- a/mount.go
+++ b/mount.go
@@ -2,6 +2,7 @@ package main
import (
"encoding/json"
+ "io/ioutil"
"log/syslog"
"os"
"os/exec"
@@ -72,20 +73,31 @@ func doMount(args *argContainer) int {
tlog.Info.Println(tlog.ColorGreen + "Filesystem mounted and ready." + tlog.ColorReset)
// We have been forked into the background, as evidenced by the set
// "notifypid".
+ var paniclog *os.File
if args.notifypid > 0 {
// Chdir to the root directory so we don't block unmounting the CWD
os.Chdir("/")
// Switch to syslog
if !args.nosyslog {
+ paniclog, err = ioutil.TempFile("", "gocryptfs_paniclog.")
+ if err != nil {
+ tlog.Fatal.Printf("Failed to create gocryptfs_paniclog: %v", err)
+ os.Exit(ErrExitMount)
+ }
+ // Switch all of our logs and the generic logger to syslog
tlog.Info.SwitchToSyslog(syslog.LOG_USER | syslog.LOG_INFO)
tlog.Debug.SwitchToSyslog(syslog.LOG_USER | syslog.LOG_DEBUG)
tlog.Warn.SwitchToSyslog(syslog.LOG_USER | syslog.LOG_WARNING)
tlog.SwitchLoggerToSyslog(syslog.LOG_USER | syslog.LOG_WARNING)
// Daemons should close all fds (and we don't want to get killed by
// SIGPIPE if any of those get closed on the other end)
- os.Stderr.Close()
- os.Stdout.Close()
os.Stdin.Close()
+ // Redirect stdout and stderr to /tmp/gocryptfs_paniclog.NNNNNN
+ // instead of closing them so users have a chance to get the
+ // backtrace on a panic.
+ // https://github.com/golang/go/issues/325#issuecomment-66049178
+ syscall.Dup2(int(paniclog.Fd()), 1)
+ syscall.Dup2(int(paniclog.Fd()), 2)
}
// Send SIGUSR1 to our parent
sendUsr1(args.notifypid)
@@ -96,6 +108,18 @@ func doMount(args *argContainer) int {
handleSigint(srv, args.mountpoint)
// Jump into server loop. Returns when it gets an umount request from the kernel.
srv.Serve()
+ // Delete empty paniclogs
+ if paniclog != nil {
+ fi, err := paniclog.Stat()
+ if err != nil {
+ tlog.Warn.Printf("paniclog fstat error: %v", err)
+ } else if fi.Size() > 0 {
+ tlog.Warn.Printf("paniclog at %q is not empty (size %d). Not deleting it.",
+ paniclog.Name(), fi.Size())
+ } else {
+ syscall.Unlink(paniclog.Name())
+ }
+ }
return 0
}