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[BUG] drops last line of container log on exit #10658

@nicks

Description

@nicks

Description

If your container emits error logs without a newline at the end, Compose quietly drops them.

Steps To Reproduce

compose.yaml:

services:
  sleep:
    image: alpine
    entrypoint: sh -c "echo -n exiting; exit 1"

run:

docker compose up

Expected behavior:
Compose to show "exiting" in the logs

Actual behavior:
No logs shown

[+] Building 0.0s (0/0)                                                                                                                                
[+] Running 2/2
 ✔ Network scratch_default    Created                                                                                                             0.0s 
 ✔ Container scratch-sleep-1  Created                                                                                                             0.1s 
Attaching to scratch-sleep-1
scratch-sleep-1 exited with code 1

Compose Version

$ docker compose version
Docker Compose version v2.18.1

Docker Environment

Client: Docker Engine - Community
 Version:    24.0.2
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.0.1-cloud-driver+005
    Path:     /home/nick/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.18.1
    Path:     /usr/lib/docker/cli-plugins/docker-compose
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.1.0
    Path:     /usr/lib/docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.19
    Path:     /usr/lib/docker/cli-plugins/docker-extension
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v0.1.0-beta.4
    Path:     /usr/lib/docker/cli-plugins/docker-init
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /usr/lib/docker/cli-plugins/docker-sbom
  scan: Docker Scan (Docker Inc.)
    Version:  v0.26.0
    Path:     /usr/lib/docker/cli-plugins/docker-scan
  scout: Command line tool for Docker Scout (Docker Inc.)
    Version:  v0.12.0
    Path:     /usr/lib/docker/cli-plugins/docker-scout
WARNING: Plugin "/usr/lib/docker/cli-plugins/docker-compose.14.backup" is not valid: plugin candidate "compose.14.backup" did not match "^[a-z][a-z0-9]*$"

Server:
 Containers: 6
  Running: 0
  Paused: 0
  Stopped: 6
 Images: 44
 Server Version: 24.0.2
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 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 logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 3dce8eb055cbb6872793272b4f20ed16117344f8
 runc version: v1.1.7-0-g860f061
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 5.15.49-linuxkit-pr
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 6
 Total Memory: 9.729GiB
 Name: docker-desktop
 ID: a92cef06-564f-4766-91bd-bc9e839af9fa
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  127.0.0.0/8
 Live Restore Enabled: false

Anything else?

Note that the Docker Desktop UI shows the logs correctly. 👀

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