COPY --from fails when source path involves a symlink #974
Description
Here's my Dockerfile, with various sensitive names and paths changed, but otherwise unchanged:
# syntax=docker/dockerfile:experimental
# Build stage
FROM ubuntu:18.10 as builder
RUN apt-get update && \
apt-get install -y automake ca-certificates cmake git g++ libtool m4 patch pkg-config python unzip wget curl zip zlib1g-dev ninja-build clang-7
RUN wget -O bazel.sh https://github.com/bazelbuild/bazel/releases/download/0.24.1/bazel-0.24.1-installer-linux-x86_64.sh && \
chmod 755 bazel.sh && \
./bazel.sh
WORKDIR /go/src/github.com/my/project
ADD . /go/src/github.com/my/project
# add commit sha
ARG COMMIT
RUN echo "COMMIT=$COMMIT" >> /go/src/github.com/my/project/VERSION
RUN cat /go/src/github.com/my/project/VERSION
# Get ready to clone our repos
RUN mkdir -p -m 0600 ~/.ssh && ssh-keyscan github.com >> ~/.ssh/known_hosts
# Compile necessary binaries for final image
RUN --mount=type=ssh CC=clang-7 CXX=clang++-7 bazel build //:my-project
# Run stage
FROM alpine:3.7
# Necessary for cloudwatch put calls to AWS
RUN apk update && apk add --no-cache ca-certificates wget
# Our binary requires glibc
RUN wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub && \
wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.29-r0/glibc-2.29-r0.apk && \
apk add glibc-2.29-r0.apk && \
rm glibc-2.29-r0.apk
# Set up glibc locale
RUN wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.29-r0/glibc-bin-2.29-r0.apk && \
wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.29-r0/glibc-i18n-2.29-r0.apk && \
apk add glibc-bin-2.29-r0.apk glibc-i18n-2.29-r0.apk && \
/usr/glibc-compat/bin/localedef -i en_US -f UTF-8 en_US.UTF-8 && \
rm glibc-bin-2.29-r0.apk glibc-i18n-2.29-r0.apk
RUN addgroup -S gmproxy && adduser -S gmproxy -G gmproxy
WORKDIR /app
# Copy over my-project binary
COPY --from=builder /go/src/github.com/my/project/bazel-bin/linux_amd64_stripped/my-project /app/
RUN chown -R myproject:myproject /app && chgrp -R 0 /app && chmod -R g=u /app
EXPOSE 8080
EXPOSE 8081
EXPOSE 8001
USER myproject
CMD ./my-project -c config.yamlI build with DOCKER_BUILDKIT=1 docker build --ssh default -f docker/alpine/Dockerfile ., and this is the error I get:
=> ERROR [stage-1 6/7] COPY --from=builder /go/src/github.com/my/project/bazel-bin/linux_amd64_stripped/my-project /app/ 0.0s
------
> [stage-1 6/7] COPY --from=builder /go/src/github.com/my/project/bazel-bin/linux_amd64_stripped/my-project /app/:
------
rpc error: code = Unknown desc = not found: not found
$ docker version
Client:
Version: 18.09.5
API version: 1.39
Go version: go1.10.4
Git commit: e8ff056
Built: Fri Apr 12 00:34:27 2019
OS/Arch: linux/amd64
Experimental: false
Server:
Engine:
Version: 18.09.5
API version: 1.39 (minimum version 1.12)
Go version: go1.10.4
Git commit: e8ff056
Built: Fri Apr 12 00:27:37 2019
OS/Arch: linux/amd64
Experimental: false