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gramineproject / gsc

Gramine Shielded Containers (Docker integration)
BSD 3-Clause "New" or "Revised" License
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GSC Build Image Couldn't Create Temporary File #193

Open vicshi06 opened 4 months ago

vicshi06 commented 4 months ago

Description of the problem

We have been trying to use gramine and gsc to build our custom graminized image. However, when we use Debian:12 as the base image, it gives me this error. It is the similar error if we use Ubuntu. The build process failed at step 12.

The image works fine if I directly use Docker run on it. 

 ---> Using cache
 ---> b2e95142dae6
Step 12/29 : RUN apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y         binutils         libprotobuf-c-dev         locales         openssl         python3         python3-cryptography         python3-protobuf         python3-pyelftools            python3-click            python3-jinja2            python3-tomli            python3-tomli-w     && apt-get autoremove -y     && rm -rf /var/lib/apt/lists/*

 ---> Running in 091f3aaa244e
Get:1 http://deb.debian.org/debian bookworm InRelease [151 kB]
Err:1 http://deb.debian.org/debian bookworm InRelease
  Couldn't create temporary file /tmp/apt.conf.CfqgCs for passing config to apt-key
Get:2 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB]
Err:2 http://deb.debian.org/debian bookworm-updates InRelease
  Couldn't create temporary file /tmp/apt.conf.nNjBHj for passing config to apt-key
Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB]
Err:3 http://deb.debian.org/debian-security bookworm-security InRelease
  Couldn't create temporary file /tmp/apt.conf.0mPqVF for passing config to apt-key
Reading package lists...

W: GPG error: http://deb.debian.org/debian bookworm InRelease: Couldn't create temporary file /tmp/apt.conf.CfqgCs for passing config to apt-key
E: The repository 'http://deb.debian.org/debian bookworm InRelease' is not signed.
W: GPG error: http://deb.debian.org/debian bookworm-updates InRelease: Couldn't create temporary file /tmp/apt.conf.nNjBHj for passing config to apt-key
E: The repository 'http://deb.debian.org/debian bookworm-updates InRelease' is not signed.
W: GPG error: http://deb.debian.org/debian-security bookworm-security InRelease: Couldn't create temporary file /tmp/apt.conf.0mPqVF for passing config to apt-key
E: The repository 'http://deb.debian.org/debian-security bookworm-security InRelease' is not signed.

Steps to reproduce

Here is our Dockerfile. We use Debian:12 right before we build the SPIRE-agent. 

# syntax = docker/dockerfile:1.6.0@sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021

# Build stage
ARG goversion
# Use alpine3.18 until go-sqlite works in 3.19
FROM --platform=${BUILDPLATFORM} golang:${goversion}-alpine3.18 as base
WORKDIR /spire
RUN apk --no-cache --update add file bash clang lld pkgconfig git make
COPY go.* ./
# https://go.dev/ref/mod#module-cache
RUN --mount=type=cache,target=/go/pkg/mod go mod download
COPY . .

# xx is a helper for cross-compilation
# when bumping to a new version analyze the new version for security issues
# then use crane to lookup the digest of that version so we are immutable
# crane digest tonistiigi/xx:1.3.0
FROM --platform=$BUILDPLATFORM tonistiigi/xx@sha256:904fe94f236d36d65aeb5a2462f88f2c537b8360475f6342e7599194f291fb7e AS xx

FROM --platform=${BUILDPLATFORM} base as builder
ARG TAG
ARG TARGETPLATFORM
ARG TARGETARCH
COPY --link --from=xx / /

# For users that wish to run SPIRE containers as a non-root user,
# provide a default unprivileged user such that the default paths
# that SPIRE will try to read from, write to, and create at runtime
# can be given the correct file ownership/permissions at build time.
ARG spireuid=1000
ARG spiregid=1000

# Set up directories that SPIRE expects by default
# Set up base directories
RUN install -d -o root -g root -m 777 /spireroot
RUN install -d -o root -g root -m 755 /spireroot/etc/ssl/certs
RUN install -d -o root -g root -m 755 /spireroot/run
RUN install -d -o root -g root -m 755 /spireroot/var/lib
RUN install -d -o root -g root -m 1777 /spireroot/tmp

# Set up directories used by SPIRE
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireroot/etc/spire
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireroot/run/spire
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireroot/var/lib/spire

# Set up spire-server directories
RUN cp -r /spireroot /spireserverroot
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireserverroot/etc/spire/server
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireserverroot/run/spire/server/private
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireserverroot/var/lib/spire/server

# Set up spire-agent directories
RUN cp -r /spireroot /spireagentroot
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireagentroot/etc/spire/agent
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireagentroot/run/spire/agent/public
RUN install -d -o ${spireuid} -g ${spiregid} -m 755 /spireagentroot/var/lib/spire/agent

RUN xx-go --wrap
RUN set -e ; xx-apk --no-cache --update add build-base musl-dev libseccomp-dev
ENV CGO_ENABLED=1
RUN --mount=type=cache,target=/root/.cache/go-build \
    --mount=type=cache,target=/go/pkg/mod \
    if [ "$TARGETARCH" = "arm64" ]; then CC=aarch64-alpine-linux-musl; elif [ "$TARGETARCH" = "s390x" ]; then CC=s390x-alpine-linux-musl; fi && \
    make build-static git_tag=$TAG git_dirty="" && \
    for f in $(find bin -executable -type f); do xx-verify --static $f; done

FROM debian:12 AS spire-base
WORKDIR /opt/spire
CMD []
COPY --link --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/

# SPIRE Agent
FROM spire-base AS spire-agent
RUN chmod 1777 /tmp
USER ${spireuid}:${spiregid}
ENTRYPOINT ["/opt/spire/bin/spire-agent", "run"]
COPY --link --from=builder /spireagentroot /
COPY --link --from=builder /spire/bin/static/spire-agent bin/
COPY sgx_agent_plugin bin/

This is my config.yaml for GSC:

# Specify the OS distro that is used to build Gramine, i.e., the distro from where the Gramine build
# gets all tools and dependencies from. This distro should match the distro underlying the
# application's Docker image; otherwise the results may be unpredictable (if you specify `"auto"`,
# which is recommended, you don't need to worry about the mismatch).
#
# Currently supported distros are:
# - ubuntu:20.04, ubuntu:21.04, ubuntu:22.04, ubuntu:23.04
# - debian:10, debian:11, debian:12
# - centos:8
# - redhat/ubi8:8.8
# - redhat/ubi8-minimal:8.8

# If Distro is set to "auto", GSC detects the distro automatically by examining the supplied
# Docker image. Alternatively, Distro can be set to one of the supported distros mentioned above.
Distro: "auto"

# If the image has a specific registry, define it here.
# Empty by default; example value: "registry.access.redhat.com/ubi8".
Registry: ""

# If you're using your own fork and branch of Gramine, specify the GitHub link and the branch name
# below; typically, you want to keep the default values though.
#
# It is also possible to specify the prebuilt Gramine Docker image (that was built previously via
# the `gsc build-gramine` command). For this, remove Repository and Branch and instead write:
#   Image:      "<prebuilt Gramine Docker image>"
#
# GSC releases are guaranteed to work with corresponding Gramine releases (and GSC `master`
# branch is guaranteed to work with current Gramine `master` branch).
Gramine:
    Repository: "https://github.com/gramineproject/gramine.git"
    Branch:     "master"

# Specify the Intel SGX driver installed on your machine (more specifically, on the machine where
# the graminized Docker container will run); there are several variants of the SGX driver:
#
#   - upstream (in-kernel) driver: use empty values like below
#         Repository: ""
#         Branch:     ""
#
#   - DCAP out-of-tree driver: same as above, use empty values
#         Repository: ""
#         Branch:     ""
#
#   - legacy out-of-tree driver: use something like the below values, but adjust the branch name
#         Repository: "https://github.com/01org/linux-sgx-driver.git"
#         Branch:     "sgx_driver_1.9"
#
SGXDriver:
    Repository: ""
    Branch:     ""
dimakuv commented 4 months ago

I do not see anything special about your original Docker image.

Would it be possible to reproduce the same on a clean environment (with all previously built Docker images purged)? And attach the GSC-build command that you used as well as the full GSC build log.

vicshi06 commented 4 months ago

Yes. I tried to remove all of my images and built it, but it gave the same error.

Here is the only command I used:

gsc build --insecure-args vicshi06/test:debian ../graminized/plugin.manifest

Here is the full log:

Building unsigned graminized Docker image `gsc-vicshi06/test:debian-unsigned` from original application image `vicshi06/test:debian`...
Warning: Duplicate key `sgx.debug`. Overriding value from `debian/entrypoint.manifest.template` by the one in `../graminized/plugin.manifest`.
Warning: Duplicate key `loader.env.PATH`. Concatenating values from `<merged ../graminized/plugin.manifest and debian/entrypoint.manifest.template>` and `<vicshi06/test:debian image env>`.
Step 1/29 : FROM debian:12 AS gramine

 ---> e15dbfac2d2b
Step 2/29 : RUN env DEBIAN_FRONTEND=noninteractive apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y         autoconf         bison         build-essential         coreutils         curl         gawk         git         libprotobuf-c-dev         linux-headers-generic         nasm         ninja-build         pkg-config         protobuf-c-compiler         protobuf-compiler         python3         python3-cryptography         python3-protobuf         wget            meson            python3-tomli            python3-tomli-w

 ---> Using cache
 ---> 0793bd44f91c
Step 3/29 : COPY intel-sgx-deb.key /

 ---> Using cache
 ---> 0021a175fff3
Step 4/29 : RUN echo 'deb [arch=amd64] https://download.01.org/intel-sgx/sgx_repo/ubuntu bionic main'     > /etc/apt/sources.list.d/intel-sgx.list     && apt-key add /intel-sgx-deb.key

 ---> Using cache
 ---> 14e5b9d262cc
Step 5/29 : RUN env DEBIAN_FRONTEND=noninteractive apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y libsgx-dcap-quote-verify-dev

 ---> Using cache
 ---> 2619c6c81725
Step 6/29 : RUN git clone https://github.com/gramineproject/gramine.git /gramine

 ---> Using cache
 ---> faf3c4726b78
Step 7/29 : RUN cd /gramine     && git fetch origin master     && git checkout master

 ---> Using cache
 ---> f47f34852c74
Step 8/29 : RUN mkdir -p /gramine/driver/asm     && cd /gramine/driver/asm     && wget --timeout=10 -O sgx.h         https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/plain/arch/x86/include/uapi/asm/sgx.h?h=v5.11     && sha256sum sgx.h | grep -q a34a997ade42b61376b1c5d3d50f839fd28f2253fa047cb9c0e68a1b00477956

 ---> Using cache
 ---> daaed81bb6fe
Step 9/29 : RUN cd /gramine     && meson setup build/ --prefix="/gramine/meson_build_output"        --buildtype=release        -Ddirect=enabled -Dsgx=enabled                        -Dsgx_driver=upstream -Dsgx_driver_include_path=/gramine/driver             && ninja -C build     && ninja -C build install

 ---> Using cache
 ---> bba0e9d779fc
Step 10/29 : FROM vicshi06/test:debian

 ---> 5a11f11890b8
Step 11/29 : USER root

 ---> Using cache
 ---> b2e95142dae6
Step 12/29 : RUN apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y         binutils         libprotobuf-c-dev         locales         openssl         python3         python3-cryptography         python3-protobuf         python3-pyelftools            python3-click            python3-jinja2            python3-tomli            python3-tomli-w     && apt-get autoremove -y     && rm -rf /var/lib/apt/lists/*

 ---> Running in 091f3aaa244e
Get:1 http://deb.debian.org/debian bookworm InRelease [151 kB]
Err:1 http://deb.debian.org/debian bookworm InRelease
  Couldn't create temporary file /tmp/apt.conf.CfqgCs for passing config to apt-key
Get:2 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB]
Err:2 http://deb.debian.org/debian bookworm-updates InRelease
  Couldn't create temporary file /tmp/apt.conf.nNjBHj for passing config to apt-key
Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB]
Err:3 http://deb.debian.org/debian-security bookworm-security InRelease
  Couldn't create temporary file /tmp/apt.conf.0mPqVF for passing config to apt-key
Reading package lists...

W: GPG error: http://deb.debian.org/debian bookworm InRelease: Couldn't create temporary file /tmp/apt.conf.CfqgCs for passing config to apt-key
E: The repository 'http://deb.debian.org/debian bookworm InRelease' is not signed.
W: GPG error: http://deb.debian.org/debian bookworm-updates InRelease: Couldn't create temporary file /tmp/apt.conf.nNjBHj for passing config to apt-key
E: The repository 'http://deb.debian.org/debian bookworm-updates InRelease' is not signed.
W: GPG error: http://deb.debian.org/debian-security bookworm-security InRelease: Couldn't create temporary file /tmp/apt.conf.0mPqVF for passing config to apt-key
E: The repository 'http://deb.debian.org/debian-security bookworm-security InRelease' is not signed.

Failed to build unsigned graminized Docker image `gsc-vicshi06/test:debian-unsigned`.

Here is my plugin.manifest:

[loader]
log_level = "error"

[fs]
mounts = [
    { type = "tmpfs", path = "/tmp/" },
]

[sgx]
debug = true
edmm_enable = false
enclave_size = "4G"
max_threads = 512
remote_attestation = "dcap"
allowed_files = [
    "file:/etc/nsswitch.conf",
    "file:/etc/host.conf",
    "file:/etc/resolv.conf",
    "file:/etc/ethers",
    "file:/etc/hosts",
    "file:/etc/group",
    "file:/etc/passwd",
    "file:/etc/gai.conf",
    "file:/etc/ssl/certs/ca-certificates.crt",
]
trusted_files = []
isvprodid = 0
isvsvn = 0
enable_stats = false
use_exinfo = false

[sgx.cpu_features]
avx = "unspecified"
avx512 = "unspecified"
amx = "unspecified"
mpx = "disabled"
pkru = "disabled"
dimakuv commented 4 months ago

RUN chmod 1777 /tmp

Do you know why you're doing this in your Docker image build?

dimakuv commented 4 months ago

@vicshi06 Can you check if PR https://github.com/gramineproject/gsc/pull/194 fixes your issue?

woju commented 4 months ago

@vicshi06 Can you check, why the image has wrong mode on /tmp? Because debian:12 looks good to me:

% docker run -it --rm debian:12 ls -ld /tmp    
drwxrwxrwt 2 root root 4096 Jun 12  2023 /tmp

So I assume the problem is somewhere between FROM and the resulting image.

vicshi06 commented 4 months ago

RUN chmod 1777 /tmp

Do you know why you're doing this in your Docker image build?

@dimakuv I added this after I encountered the bug, but it didn't solve the issue.

@vicshi06 Can you check, why the image has wrong mode on /tmp? Because debian:12 looks good to me:

% docker run -it --rm debian:12 ls -ld /tmp    
drwxrwxrwt 2 root root 4096 Jun 12  2023 /tmp

So I assume the problem is somewhere between FROM and the resulting image.

@woju As you can see, I didn't even touch /tmp in my final image. All I am doing is copying files from builder to my image. I don't understand why this would change mode on /tmp. In addition, I am using the official Dockerfile from the spire repo, but the only two things I changed are using debian:12 and mounting my own binary.

This is quite a weird bug :(

vicshi06 commented 4 months ago

@vicshi06 Can you check if PR #194 fixes your issue?

@dimakuv It did fix the issue, but now the build failed at step 23 with no helpful error message

Building unsigned graminized Docker image `gsc-vicshi06/test:debian-unsigned` from original application image `vicshi06/test:debian`...
Warning: Duplicate key `sgx.debug`. Overriding value from `debian/entrypoint.manifest.template` by the one in `../graminized/plugin.manifest`.
Warning: Duplicate key `loader.env.PATH`. Concatenating values from `<merged ../graminized/plugin.manifest and debian/entrypoint.manifest.template>` and `<vicshi06/test:debian image env>`.
Step 1/30 : FROM debian:12 AS gramine

 ---> e15dbfac2d2b
Step 2/30 : RUN env DEBIAN_FRONTEND=noninteractive apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y         autoconf         bison         build-essential         coreutils         curl         gawk         git         libprotobuf-c-dev         linux-headers-generic         nasm         ninja-build         pkg-config         protobuf-c-compiler         protobuf-compiler         python3         python3-cryptography         python3-protobuf         wget            meson            python3-tomli            python3-tomli-w

 ---> Using cache
 ---> 0793bd44f91c
Step 3/30 : COPY intel-sgx-deb.key /

 ---> Using cache
 ---> 0021a175fff3
Step 4/30 : RUN echo 'deb [arch=amd64] https://download.01.org/intel-sgx/sgx_repo/ubuntu bionic main'     > /etc/apt/sources.list.d/intel-sgx.list     && apt-key add /intel-sgx-deb.key

 ---> Using cache
 ---> 14e5b9d262cc
Step 5/30 : RUN env DEBIAN_FRONTEND=noninteractive apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y libsgx-dcap-quote-verify-dev

 ---> Using cache
 ---> 2619c6c81725
Step 6/30 : RUN git clone https://github.com/gramineproject/gramine.git /gramine

 ---> Using cache
 ---> faf3c4726b78
Step 7/30 : RUN cd /gramine     && git fetch origin master     && git checkout master

 ---> Using cache
 ---> f47f34852c74
Step 8/30 : RUN mkdir -p /gramine/driver/asm     && cd /gramine/driver/asm     && wget --timeout=10 -O sgx.h         https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/plain/arch/x86/include/uapi/asm/sgx.h?h=v5.11     && sha256sum sgx.h | grep -q a34a997ade42b61376b1c5d3d50f839fd28f2253fa047cb9c0e68a1b00477956

 ---> Using cache
 ---> daaed81bb6fe
Step 9/30 : RUN cd /gramine     && meson setup build/ --prefix="/gramine/meson_build_output"        --buildtype=release        -Ddirect=enabled -Dsgx=enabled                        -Dsgx_driver=upstream -Dsgx_driver_include_path=/gramine/driver             && ninja -C build     && ninja -C build install

 ---> Using cache
 ---> bba0e9d779fc
Step 10/30 : FROM vicshi06/test:debian

 ---> 5a11f11890b8
Step 11/30 : USER root

 ---> Using cache
 ---> b2e95142dae6
Step 12/30 : RUN chmod 1777 /tmp

 ---> Using cache
 ---> 06ab4bdd8edc
Step 13/30 : RUN apt-get update     && env DEBIAN_FRONTEND=noninteractive apt-get install -y         binutils         libprotobuf-c-dev         locales         openssl         python3         python3-cryptography         python3-protobuf         python3-pyelftools            python3-click            python3-jinja2            python3-tomli            python3-tomli-w     && apt-get autoremove -y     && rm -rf /var/lib/apt/lists/*

 ---> Using cache
 ---> 314c90963475
Step 14/30 : RUN locale-gen en_US.UTF-8

 ---> Using cache
 ---> 0b2a3dea6325
Step 15/30 : ENV LC_ALL en_US.UTF-8

 ---> Using cache
 ---> c22e753beada
Step 16/30 : ENV LANG en_US.UTF-8

 ---> Using cache
 ---> f419e73ab5ef
Step 17/30 : ENV LANGUAGE en_US.UTF-8

 ---> Using cache
 ---> a67c71d131fa
Step 18/30 : RUN mkdir -p /gramine/app_files

 ---> Using cache
 ---> a9a50ef74ad0
Step 19/30 : RUN chown : /gramine/app_files/

 ---> Using cache
 ---> 77f589fa48e9
Step 20/30 : RUN rm -rf $HOME/.cache

 ---> Using cache
 ---> 86e07c52514f
Step 21/30 : USER :

 ---> Using cache
 ---> 9954f69dd2a4
Step 22/30 : RUN rm -rf $HOME/.cache

 ---> Using cache
 ---> 2875cb2ec6df
Step 23/30 : COPY --from=gramine --chown=: /gramine/meson_build_output /gramine/meson_build_output

Failed to build unsigned graminized Docker image `gsc-vicshi06/test:debian-unsigned`.
dimakuv commented 4 months ago

It feels like the USER in the original Docker image is empty or corrupted? Why do we see lines like Step 21/30 : USER :...

Can you perform docker inspect vicshi06/test:debian on your original Docker image and show us the output?

vicshi06 commented 4 months ago

docker inspect vicshi06/test:debian

You are right. For some reason my user is ":" 

[
    {
        "Id": "sha256:5a11f11890b8dc47e53a01408bd65573206cef787b94d280c1dcf396f56724ef",
        "RepoTags": [
            "vicshi06/test:debian"
        ],
        "RepoDigests": [
            "vicshi06/test@sha256:b75d1efc18fb1f43f145cd12a404c7345165f22b90018a8954628df2d3fc7d46"
        ],
        "Parent": "",
        "Comment": "buildkit.dockerfile.v0",
        "Created": "2024-04-12T23:09:54.203402651Z",
        "Container": "",
        "ContainerConfig": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "DockerVersion": "",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": ":",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": null,
            "ArgsEscaped": true,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "/opt/spire",
            "Entrypoint": [
                "/opt/spire/bin/spire-agent",
                "run"
            ],
            "OnBuild": null,
            "Labels": null
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 194414300,
        "VirtualSize": 194414300,
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/96095bc8f734226c75c4ce40508134ca8dd855c3b118a6079f4547baa3588892/diff:/var/lib/docker/overlay2/a2a52730ddb817dbf32bf19865fe003c1b2e8d0e976fc37b91596e88bba39538/diff:/var/lib/docker/overlay2/7aa7c5846dd34bec8298258288e63cdb84637fa0883717f6826f8b046cdb3801/diff:/var/lib/docker/overlay2/31f0c2685a7634560f5d11b3ceda28f6b0264deed38d3d2709cd77e937cba53b/diff:/var/lib/docker/overlay2/4ce3380a8a629623e39710115110cbe943eae63a4d424cb94347eb0e7f31a1d7/diff:/var/lib/docker/overlay2/b1f0a51b85e8b1b378bed5f7bcf1eb4aec4bd3dcf8ffcf7b1fa051168b3bee59/diff",
                "MergedDir": "/var/lib/docker/overlay2/cf0a1415cf5d3f874a211e91316edee9df9ece595d5357248da8404e54e15854/merged",
                "UpperDir": "/var/lib/docker/overlay2/cf0a1415cf5d3f874a211e91316edee9df9ece595d5357248da8404e54e15854/diff",
                "WorkDir": "/var/lib/docker/overlay2/cf0a1415cf5d3f874a211e91316edee9df9ece595d5357248da8404e54e15854/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:c5bb35826823702969891b025087135cceefb084dec1452af5a6fb2938bd9a13",
                "sha256:8ebdd97378f6249ddcd979555a1554cc328e3cab204dc3240526d25e96897fa2",
                "sha256:9f7679fd96b1d89231c89068e7b8b4fa6d7abfb021edeca4aae698acfd54d9ef",
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