Incus create hangs in Azure Pipelines runner

Incus
1

When trying to run “incus create” in a subprocess of the Azure Pipelines Agent (GitHub - microsoft/azure-pipelines-agent: Azure Pipelines Agent 🚀), the incus client hangs waiting for some input from stdin. I spent way too long trying to figure out what was going on, eventually realizing that a way around this is to run incus create ... < /dev/null.

But there’s something that Azure Pipelines is doing that causes termios to believe that stdin is not a terminal (incus/cmd/incus/create.go at fa40153a629245d2c73bda9a9c7f2c5645dee52f · lxc/incus · GitHub). And I hope that there’s a way to fix it so no one else experiences the pain that I’ve felt over the past 24 hours.

2

Welcome!

Commands like incus profile edit do read from stdin and they have the same code to check for stdin. You can cat myprofile.txt | incus profile edit myprofile.

Can you try to preface the incus create with nohup? It effectively disables stdin but I do not know if it has any side-effects to your case.
Use as

nohup incus create images:alpine/edge/cloud mycontainer
3

That command actually hangs as well :frowning:

$ sudo strace -p 2736
strace: Process 2736 attached
futex(0x15621a0, FUTEX_WAIT_PRIVATE, 0, NULL
4

See https://tldp.org/LDP/abs/html/io-redirection.html on how to close file descriptors.
Close stdin: exec 0<&-

Failing that, file a bug report on Incus.