[BUG] Keypresses are swallowed when piping `docker compose exec` output to `less`
Description
When running commands like docker compose exec containername mysql... | less you've got to press keys twice (or more) for them to take effect.
Steps To Reproduce
docker compose exec db find / | less(use any running container name instead of db)- try to navigate with arrow keys
- only if you manage to get to the end of the output, the keys start working normally
Compose Version
Docker Compose version v2.39.1
Docker Environment
Client: Docker Engine - Community
Version: 28.3.3
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.26.1
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v2.39.1
Path: /usr/libexec/docker/cli-plugins/docker-compose
Server:
Containers: 13
Running: 13
Paused: 0
Stopped: 0
Images: 149
Server Version: 28.3.3
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: local
Cgroup Driver: cgroupfs
Cgroup Version: 2
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
CDI spec directories:
/etc/cdi
/var/run/cdi
Swarm: inactive
Runtimes: io.containerd.runc.v2 nvidia runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 05044ec0a9a75232cad458027ca83437aae3f4da
runc version: v1.2.5-0-g59923ef
init version: de40ad0
Security Options:
apparmor
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.15.8-custom+
Operating System: Debian GNU/Linux 13 (trixie)
OSType: linux
Architecture: x86_64
CPUs: 24
Total Memory: 125.6GiB
Name: homecomp
ID: 351707c3-7887-42ad-af47-d492581b85d5
Docker Root Dir: /var/lib/docker
Debug Mode: false
Experimental: false
Insecure Registries:
::1/128
127.0.0.0/8
Live Restore Enabled: false
Anything else?
Works fine if I run the same command with just docker exec and use an unscoped container name. This is a repost of issue #11775 (closed as stale) which is a repost of issue #8428 which has been closed without any comments.
Please, exclude it from the stale bot, there's nothing to add and this issue is trivially reproduced. Is there a real need to bump it every month so it doesn't get closed?
I'm looking into this. Sorry for the inconvenience, we use stale bot as we get many issues reported but never get an update from reported after we ask for more details. Stale bot helps us focus on relevant issues, with the risk we miss a few ones.
AFAICT the root cause for this issue is that docker compose exec runs interactive by default, while docker exec requires an explicit -i. Doing so, you have compose and less fighting to capture your keyboard input, so this weird behavior. You can reproduce this same issue running docker exec --interactive db ... | less.
The "fix" is to run compose command with --interactive=false