107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kernel
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import (
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"fmt"
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"math/rand"
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"sync"
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)
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// syslog represents a sentry-global kernel log.
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//
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// Currently, it contains only fun messages for a dmesg easter egg.
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//
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// +stateify savable
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type syslog struct {
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// mu protects the below.
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mu sync.Mutex `state:"nosave"`
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// msg is the syslog message buffer. It is lazily initialized.
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msg []byte
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}
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// Log returns a copy of the syslog.
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func (s *syslog) Log() []byte {
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s.mu.Lock()
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defer s.mu.Unlock()
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if s.msg != nil {
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// Already initialized, just return a copy.
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o := make([]byte, len(s.msg))
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copy(o, s.msg)
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return o
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}
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// Not initialized, create message.
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allMessages := []string{
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"Synthesizing system calls...",
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"Mounting deweydecimalfs...",
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"Moving files to filing cabinet...",
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"Digging up root...",
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"Constructing home...",
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"Segmenting fault lines...",
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"Creating bureaucratic processes...",
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"Searching for needles in stacks...",
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"Preparing for the zombie uprising...",
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"Feeding the init monster...",
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"Creating cloned children...",
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"Daemonizing children...",
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"Waiting for children...",
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"Gathering forks...",
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"Committing treasure map to memory...",
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"Reading process obituaries...",
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"Searching for socket adapter...",
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"Creating process schedule...",
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"Generating random numbers by fair dice roll...",
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"Rewriting operating system in Javascript...",
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"Consulting tar man page...",
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"Forking spaghetti code...",
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"Checking naughty and nice process list...",
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"Checking naughty and nice process list...", // Check it up to twice.
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"Granting licence to kill(2)...", // British spelling for British movie.
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"Letting the watchdogs out...",
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}
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selectMessage := func() string {
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i := rand.Intn(len(allMessages))
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m := allMessages[i]
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// Delete the selected message.
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allMessages[i] = allMessages[len(allMessages)-1]
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allMessages = allMessages[:len(allMessages)-1]
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return m
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}
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const format = "<6>[%11.6f] %s\n"
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s.msg = append(s.msg, []byte(fmt.Sprintf(format, 0.0, "Starting gVisor..."))...)
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time := 0.1
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for i := 0; i < 10; i++ {
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time += rand.Float64() / 2
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s.msg = append(s.msg, []byte(fmt.Sprintf(format, time, selectMessage()))...)
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}
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time += rand.Float64() / 2
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s.msg = append(s.msg, []byte(fmt.Sprintf(format, time, "Ready!"))...)
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// Return a copy.
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o := make([]byte, len(s.msg))
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copy(o, s.msg)
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return o
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}
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