Feature: improve debugging of COPY failures #2690
Description
Description
Runing docker build does not provide enough detail for debugging COPY failures. Requesting a feature to help debugging.
For example, this is a common issue as noted by 200+ upvotes on stackoverflow: https://stackoverflow.com/a/36028733/1865272
Steps to reproduce the issue:
mkdir tmp
cd tmp
echo '**/bin' > .dockerignore
mkdir bin
date > bin/date.out
echo 'FROM alpine
COPY bin/date.out foo' > Dockerfile
docker build .
Describe the results you received:
The output is:
Sending build context to Docker daemon 3.072kB
Step 1/2 : FROM alpine
---> a24bb4013296
Step 2/2 : COPY bin/date.out foo
COPY failed: stat /var/lib/docker/tmp/docker-builder394713048/bin/date.out: no such file or directory
Note that the output from -D doesn't help either.
Describe the results you expected:
If copy fails to find anything, I'd like it to check without the ignore rules and emit something like:
"Warning: Your .dockerignore prevented these files from copying: bin/date.out"
Additional information you deem important (e.g. issue happens only occasionally):
Output of docker version:
Client: Docker Engine - Community
Version: 19.03.8
API version: 1.40
Go version: go1.12.17
Git commit: afacb8b7f0
Built: Wed Mar 11 01:25:46 2020
OS/Arch: linux/amd64
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 19.03.13-beta2
API version: 1.40 (minimum version 1.12)
Go version: go1.13.14
Git commit: ff3fbc9d55
Built: Mon Aug 3 15:06:50 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683
Output of docker info:
Client:
Debug Mode: false
Plugins:
ecs: Docker ECS (Docker Inc., v1.0.0-beta.5)
app: Docker Application (Docker Inc., v0.8.0)
buildx: Build with BuildKit (Docker Inc., v0.3.1-tp-docker)
Server:
Containers: 13
Running: 1
Paused: 0
Stopped: 12
Images: 1303
Server Version: 19.03.13-beta2
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
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: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
init version: fec3683
Security Options:
seccomp
Profile: default
Kernel Version: 4.19.104-microsoft-standard
Operating System: Docker Desktop
OSType: linux
Architecture: x86_64
CPUs: 12
Total Memory: 24.87GiB
Name: docker-desktop
ID: MWAP:FMYO:IGBY:JVHV:IY5P:LUJF:BUYE:ADYV:35TP:U3GW:TR2A:KV63
Docker Root Dir: /var/lib/docker
Debug Mode: true
File Descriptors: 51
Goroutines: 56
System Time: 2020-08-27T00:52:06.6468469Z
EventsListeners: 4
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
Product License: Community Engine
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
Additional environment details (AWS, VirtualBox, physical, etc.):
Windows 10 running WSL2 with Ubuntu 18.04