add notice for users don't printf in func init()

[guhan121]

if use a printf in func init(){}

This may cause the upgrade check to fail！

user will got sanity check failed

eg:
add

func init() {
	fmt.Println("hahhahahhahahahaaha")
}

to github.com/jpillora/overseer/example/main.go

bogon:example qiantao$ ./example.sh 
BUILT APP (1)
RUNNING APP
hahhahahhahahahaaha
2019/03/22 17:22:13 [overseer master] run
2019/03/22 17:22:13 [overseer master] setupSignalling
2019/03/22 17:22:13 [overseer master] checking for updates...
2019/03/22 17:22:13 [overseer master] no updates
2019/03/22 17:22:13 [overseer master] starting /Users/qiantao/work/GoTestSrc/src/github.com/jpillora/overseer/example/my_app
hahhahahhahahahaaha
2019/03/22 17:22:13 [overseer slave#1] run
2019/03/22 17:22:13 [overseer slave#1] slave wait sp.Config.RestartSignal
2019/03/22 17:22:13 [overseer slave#1] start program
app#1 start
app#1 BuildDate=20190322_172211
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) listening...
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
app#1 work
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
app#1 work
BUILT APP (2)
2019/03/22 17:22:18 [overseer master] streaming update...
2019/03/22 17:22:18 [overseer master] sanity check failed
2019/03/22 17:22:18 [overseer master] checking for updates...
app#1 work
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
2019/03/22 17:22:19 [overseer master] no updates
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
app#1 work
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=5000000000)
BUILT APP (3)
app#1 work
2019/03/22 17:22:23 [overseer master] streaming update...
2019/03/22 17:22:23 [overseer master] sanity check failed
2019/03/22 17:22:23 [overseer master] checking for updates...
2019/03/22 17:22:24 [overseer master] no updates
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
app#1 work
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=5000000000)
app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0)
app#1 work
2019/03/22 17:22:27 [overseer master] proxy signal (terminated)
2019/03/22 17:22:27 [overseer master] prog exited with -1

[jpillora]

I think the sanity check function should instead look for a string contained in the output. Then it would ignore any extra strings found.

…

On Fri, 22 Mar 2019 at 20:27, guhan121 ***@***.***> wrote: if use a printf in func init(){} This may cause the upgrade check to fail！ user will got sanity check failed eg: add func init() { fmt.Println("hahhahahhahahahaaha") } to github.com/jpillora/overseer/example/main.go bogon:example qiantao$ ./example.sh BUILT APP (1) RUNNING APP hahhahahhahahahaaha 2019/03/22 17:22:13 [overseer master] run 2019/03/22 17:22:13 [overseer master] setupSignalling 2019/03/22 17:22:13 [overseer master] checking for updates... 2019/03/22 17:22:13 [overseer master] no updates 2019/03/22 17:22:13 [overseer master] starting /Users/qiantao/work/GoTestSrc/src/github.com/jpillora/overseer/example/my_app hahhahahhahahahaaha 2019/03/22 17:22:13 [overseer slave#1] run 2019/03/22 17:22:13 [overseer slave#1] slave wait sp.Config.RestartSignal 2019/03/22 17:22:13 [overseer slave#1] start program app#1 start app#1 BuildDate=20190322_172211 app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) listening... app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) app#1 work app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) app#1 work BUILT APP (2) 2019/03/22 17:22:18 [overseer master] streaming update... 2019/03/22 17:22:18 [overseer master] sanity check failed 2019/03/22 17:22:18 [overseer master] checking for updates... app#1 work app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) 2019/03/22 17:22:19 [overseer master] no updates app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) app#1 work app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=5000000000) BUILT APP (3) app#1 work 2019/03/22 17:22:23 [overseer master] streaming update... 2019/03/22 17:22:23 [overseer master] sanity check failed 2019/03/22 17:22:23 [overseer master] checking for updates... 2019/03/22 17:22:24 [overseer master] no updates app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) app#1 work app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=5000000000) app#1 (45fb899a1abd7bd65c698fbcbc6525bade97932f) says hello (d=0) app#1 work 2019/03/22 17:22:27 [overseer master] proxy signal (terminated) 2019/03/22 17:22:27 [overseer master] prog exited with -1 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#30>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAmr8woRDmNoPcSLpYZDlpFjff7QxzxKks5vZKIUgaJpZM4cDKJx> .

[wgjtyu]

always got "sanity check failed" before remove fmt.Printf in the Init func.
thanks, guhan121

[yangyuan6]

always got "sanity check failed" before remove fmt.Printf in the Init func.
thanks, guhan121

I fixed it.
see mr