Switch to Go 1.12

[Kubuxu]

Got some errors in version deps PR from updating to Go 1.12
Creating this PR to track it

[Kubuxu]

Sharness is failing on some ipfs add, not sure why.

[Stebalien]

(rebuilding as there was no useful information in the test logs)

[Stebalien]

Ok, I think we have a memory corruption bug somewhere. Fun times.

[Kubuxu]

It is still failing so I wouldn't pass it.
I also don't really have time to investigate it deeply.

[Stebalien]

That's disturbing...

[Stebalien]

I still have no idea what's going on here. I can't reproduce on my machine at all.

[Kubuxu]

Same, I couldn't reproduce.

[Kubuxu]

Aaah, it is a problem in sharness coverage wrapper:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x48e76e]

goroutine 19 [running]:
os.(*Process).signal(0x0, 0x4f8600, 0xc0000d2188, 0x0, 0x0)
	/usr/local/go/src/os/exec_unix.go:56 +0x2e
os.(*Process).Signal(...)
	/usr/local/go/src/os/exec.go:131
main.main.func1(0xc0000ec000, 0xc0000de1e0)
	/home/circleci/ipfs/go-ipfs/coverage/main/main.go:49 +0x71
created by main.main
	/home/circleci/ipfs/go-ipfs/coverage/main/main.go:47 +0x428

[Kubuxu]

@Stebalien should be fixed.

[Stebalien]

How did you find that.

❤️

[Kubuxu]

On circle: disabled -j10, disabled continue on failure, enabled SSH, waited for failure, connected SSH (this took 5 tires because I was leaving it for too long and Circle was closing SSH). Then I've checked the trash directory in test/sharness.

[Stebalien]

TIL, circle has ssh access... That's going to make my life much easier.

[Kubuxu]

Yeah, it is semi-hidden under a menu arrow of Rebuild