docker attach hangs setting terminal state when attaching to container

[acbodine]

Let's say I have a container such that:

docker@boot2docker:~$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
3a73e17af236        ubuntu:14.04        "/bin/bash"         2 seconds ago       Up 1 seconds                            modest_mcclintock

Then I attach to it:

docker@boot2docker:~$ docker attach modest_mcclintock

I press any key and I see:

docker@boot2docker:~$ docker attach modest_mcclintock
root@3a73e17af236:/# 
root@3a73e17af236:/# 

Shouldn't the first root@3a73e17af236:/# prompt be displayed when docker attach is run?

I can verify this isn't a boot2docker problem as I have seen similar behavior on Ubuntu 14.04

docker@boot2docker:~$ uname -a
Linux boot2docker 3.16.7-tinycore64 #1 SMP Tue Dec 16 23:03:39 UTC 2014 x86_64 GNU/Linux

docker@boot2docker:~$ docker version
Client version: 1.4.1
Client API version: 1.16
Go version (client): go1.3.3
Git commit (client): 5bc2ff8
OS/Arch (client): linux/amd64
Server version: 1.4.1
Server API version: 1.16
Go version (server): go1.3.3
Git commit (server): 5bc2ff8

docker@boot2docker:~$ docker -D info
Containers: 1
Images: 53
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Dirs: 55
Execution Driver: native-0.2
Kernel Version: 3.16.7-tinycore64
Operating System: Boot2Docker 1.4.1 (TCL 5.4); master : 86f7ec8 - Tue Dec 16 23:11:29 UTC 2014
CPUs: 8
Total Memory: 1.961 GiB
Name: boot2docker
ID: CMKY:4CQL:L2XD:XDLJ:NFT3:R6HT:FVDW:JIJG:QFUO:IIQO:JK6I:7SAR
Debug mode (server): true
Debug mode (client): true
Fds: 11
Goroutines: 11
EventsListeners: 0
Init Path: /usr/local/bin/docker
Docker Root Dir: /mnt/sda1/var/lib/docker

[acbodine]

I'm happy to submit a PR for this fix as well as it follows the workflow I looked into for #9860, if it is determined to be an issue.

[jessfraz]

can you try on master? you can download binaries from master.dockerproject.com

[acbodine]

From the tip of master 7d80fd6ca6f26f37b5c19d95b53c7fb4faa22bd1 I'm seeing the same behavior

[jessfraz]

why are you attaching to bash? I think that is intentional behavior if you want to execute more things inside the container use docker exec

[jessfraz]

attach seems to be working fine for me on master with irssi and mutt

[acbodine]

ha - so this example was/is something I have been using to test other issues with being a long running process that won't die on me. Aside from that, you are right, it's not very practical. I noticed this behavior and wasn't sure if it was correct or not. It seems like when attaching the container's stdout isn't flushed to the cli until the cli provides data on the container's stdin in this case.

[jessfraz]

so wdyt is this still an issue, sorry im confused :)

[jessfraz]

sorry and hit wrong button

[jessfraz]

ping @acbodine

[acbodine]

I meant to close this. Whoops.

[jessfraz]

ah cool thanks!

On Mon, Mar 2, 2015 at 11:05 AM, Andrew C. Bodine notifications@github.com
wrote:

I meant to close this. Whoops.

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