environment-setup.sh fails

[Robie Basak]

Following the instructions at HACKING.md:

git clone https://github.com/snapcore/snapcraft.git
cd snapcraft
sudo snap install lxd
sudo lxd init --auto --storage-backend=dir

The following commands seem to be unnecessary in a fresh Ubuntu VM from a cloud
image as the ubuntu user is already a member of the lxd group as confirmed by
"groups".
# sudo adduser "$USER" lxd
# newgrp lxd

Then:

$ ./tools/environment-setup.sh
Creating snapcraft-dev
Error: Failed to run: /usr/lib/lxd/lxd forkstart snapcraft-dev /var/lib/lxd/containers /var/log/lxd/snapcraft-dev/lxc.conf:
Try `lxc info --show-log snapcraft-dev` for more info
$ lxc info --show-log snapcraft-dev
Name: snapcraft-dev
Remote: unix://
Architecture: x86_64
Created: 2019/10/11 14:00 UTC
Status: Stopped
Type: persistent
Profiles: default

Log:

lxc snapcraft-dev 20191011140030.686 ERROR conf - conf.c:lxc_map_ids:2999 - newuidmap failed to write mapping "newuidmap: uid range [1000-1001) -> [1000-1001) not allowed": newuidmap 7549 0 100000 1000 1000 1000 1 1001 101001 64535
lxc snapcraft-dev 20191011140030.686 ERROR start - start.c:lxc_spawn:1708 - Failed to set up id mapping.
lxc snapcraft-dev 20191011140030.706 WARN network - network.c:lxc_delete_network_priv:2613 - Invalid argument - Failed to remove interface "vethRXAOYT" from "lxdbr0"
lxc snapcraft-dev 20191011140030.706 ERROR lxccontainer - lxccontainer.c:wait_on_daemonized_start:842 - Received container state "ABORTING" instead of "RUNNING"
lxc snapcraft-dev 20191011140030.707 ERROR start - start.c:__lxc_start:1939 - Failed to spawn container "snapcraft-dev"
lxc 20191011140030.720 WARN commands - commands.c:lxc_cmd_rsp_recv:132 - Connection reset by peer - Failed to receive response for command "get_state"

Expected: container successfully created
Actual: lxd error on the uid mapping

I don't understand why this isn't working. Here's the problem reduced to just
lxd: https://pastebin.ubuntu.com/p/8Sfk349bJf/

It isn't clear to me if this is a problem with the instructions in HACKING.md, with your
setup script, or an lxd bug. However this is a great big obstacle in getting a
development environment set up for snapcraft, so I'm filing it here.

[Robie Basak (racb)]

Thanks to albert23 in #lxcontainers

The following additional entries were required to be added manually:

/etc/subuid:
root:1000:1

/etc/subgid:
root:1000:1

(where 1000 is, I think, $UID on the host).

I guess this needs adding to HACKING.md? Note: I haven't tried this through yet, but the above fix seems to get around the immediate problem.

[Sergio Schvezov (sergiusens)]

What base image was used for this Ubuntu VM on the cloud?

[Robie Basak (racb)]

I believe it was 20191008 (bionic, amd64). Let me try it again though just to make sure.

$ cat /etc/cloud/build.info
build_name: server
serial: 20191008

$ sudo apt update && sudo apt upgrade # on 2019-10-16
...

Then following steps to reproduce as in the bug description, I still get the same failure:

$ ./tools/environment-setup.sh
Creating snapcraft-dev
Error: Failed to run: /usr/lib/lxd/lxd forkstart snapcraft-dev /var/lib/lxd/containers /var/log/lxd/snapcraft-dev/lxc.conf:
Try `lxc info --show-log snapcraft-dev` for more info

$ lxc info --show-log snapcraft-dev
Name: snapcraft-dev
Remote: unix://
Architecture: x86_64
Created: 2019/10/16 11:09 UTC
Status: Stopped
Type: persistent
Profiles: default

Log:

lxc snapcraft-dev 20191016111008.606 ERROR conf - conf.c:lxc_map_ids:2999 - newuidmap failed to write mapping "newuidmap: uid range [1000-1001) -> [1000-1001) not allowed": newuidmap 8229 0 100000 1000 1000 1000 1 1001 101001 64535
lxc snapcraft-dev 20191016111008.606 ERROR start - start.c:lxc_spawn:1708 - Failed to set up id mapping.
lxc snapcraft-dev 20191016111008.627 WARN network - network.c:lxc_delete_network_priv:2613 - Invalid argument - Failed to remove interface "vethCBQKWJ" from "lxdbr0"
lxc snapcraft-dev 20191016111008.628 ERROR lxccontainer - lxccontainer.c:wait_on_daemonized_start:842 - Received container state "ABORTING" instead of "RUNNING"
lxc snapcraft-dev 20191016111008.629 ERROR start - start.c:__lxc_start:1939 - Failed to spawn container "snapcraft-dev"
lxc 20191016111008.645 WARN commands - commands.c:lxc_cmd_rsp_recv:132 - Connection reset by peer - Failed to receive response for command "get_state"