exit status 1 all the time?

[cdrage]

For some reason I'm getting this when building all the examples:

acbuild/examples/apache  master ✗                                                                                                                                                                                                                      30d ◒  
▶ sudo ./build-apache.sh
Beginning build with an empty ACI
Setting name of ACI to example.com/apache
Adding dependency "quay.io/coreos/alpine-sh"
Running: [apk update]
run: exit status 1
Ending the build

Any idea as to why? No debug info for this :(

[cdrage]

Using:

acbuild/examples/apache  master ✗                                                                                                                                                                                                                     30d ◒  ⍉
▶ acbuild version
acbuild version v0.2.2-2-g46ad9c4
appc version 0.7.1+git

(master)

[cgonyeo]

Related: #162

I'm aware of this as a problem, but have no clue what's causing it. I'll look into it soon.

[cdrage]

@dgonyeo #162
Okay, so I think I may have found the problem.

If you build using:
acbuild --debug begin quay.io/listhub/alpine

it works fine (without adding dep)

but if you use it depending on the dep, it doesn't
acbuild --debug dep add quay.io/coreos/alpine-sh

issue with dep?
any ideas?

[cgonyeo]

That may mean that there's some issue with overlayfs, I'll see if I can investigate further.

[cdrage]

FYI, I'm building on Debian 8 with 3.16.0-4-amd64.

[cgonyeo]

I think I may have had a friend who saw a similar, if not identical issue also in Debian once. Guess it's time to spin up a Debian vm.

[cgonyeo]

Figured it out: acbuild doesn't print a useful error message when the overlayfs kernel module isn't available.

At this line: https://github.com/appc/acbuild/blob/master/lib/run.go#L83 acbuild execs modprobe overlay, and if an error is encountered it's simply returned. A much better behavior would be to detect when the error is exit code 1, which implies that the module failed to load. I'll make a PR.

For specifically debian, I found this, which says that overlayfs didn't make it into Linux until 3.18. It also looks like you can get the newer kernel from experimental, so I'd suggest you give that a shot if you want to get acbuild working in debian.

Alternatively if you avoid builds with dependencies, acbuild won't need overlayfs. You can modify the apache example by removing the line:

acbuild --debug dep add quay.io/coreos/alpine-sh

and replacing the line:

acbuild --debug begin

with

acbuild --debug beginquay.io/coreos/alpine-sh

[cgonyeo]

#171

[cdrage]

Thanks 👯 !