podman build -o type=tar,dest=- mixes tar and messages

[akihikodaki]

Issue Description

podman build -o type=tar,dest=- mixes tar and messages into stdout.

Steps to reproduce the issue

Steps to reproduce the issue

1. Run podman build -o type=tar,dest=- /path/to/context | tar xC /path/to/destination

Describe the results you received

tar: This does not look like a tar archive

Describe the results you expected

It should not result in an error.

podman info output

host:
  arch: arm64
  buildahVersion: 1.36.0
  cgroupControllers:
  - cpu
  - io
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.10-1.fc40.aarch64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.10, commit: '
  cpuUtilization:
    idlePercent: 86.45
    systemPercent: 1.69
    userPercent: 11.86
  cpus: 8
  databaseBackend: sqlite
  distribution:
    distribution: fedora-asahi-remix
    variant: workstation
    version: "40"
  eventLogger: journald
  freeLocks: 2048
  hostname: fedora
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
  kernel: 6.8.10-400.asahi.fc40.aarch64+16k
  linkmode: dynamic
  logDriver: journald
  memFree: 3635462144
  memTotal: 24631132160
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.11.0-1.fc40.aarch64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.11.0
    package: netavark-1.11.0-1.fc40.aarch64
    path: /usr/libexec/podman/netavark
    version: netavark 1.11.0
  ociRuntime:
    name: crun
    package: crun-1.15-1.fc40.aarch64
    path: /usr/bin/crun
    version: |-
      crun version 1.15
      commit: e6eacaf4034e84185fd8780ac9262bbf57082278
      rundir: /run/user/1000/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20240607.g8a83b53-1.fc40.aarch64
    version: |
      pasta 0^20240607.g8a83b53-1.fc40.aarch64-pasta
      Copyright Red Hat
      GNU General Public License, version 2 or later
        <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
  remoteSocket:
    exists: false
    path: /run/user/1000/podman/podman.sock
  rootlessNetworkCmd: pasta
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.2.2-2.fc40.aarch64
    version: |-
      slirp4netns version 1.2.2
      commit: 0ee2d87523e906518d34a6b423271e4826f71faf
      libslirp: 4.7.0
      SLIRP_CONFIG_VERSION_MAX: 4
      libseccomp: 2.5.5
  swapFree: 8507080704
  swapTotal: 8589918208
  uptime: 3h 21m 27.00s (Approximately 0.12 days)
  variant: v8
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
store:
  configFile: /home/me/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/me/.local/share/containers/storage
  graphRootAllocated: 991543238656
  graphRootUsed: 966477721600
  graphStatus:
    Backing Filesystem: btrfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 31
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/me/.local/share/containers/storage/volumes
version:
  APIVersion: 5.2.0-dev
  Built: 1718264375
  BuiltTime: Thu Jun 13 16:39:35 2024
  GitCommit: 61abb690038eecf0661ade2f1f465fc85229d604-dirty
  GoVersion: go1.22.3
  Os: linux
  OsArch: linux/arm64
  Version: 5.2.0-dev

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

Yes

Additional environment details

No response

Additional information

No response

[jmou]

Just wanted to mention that this also affects the shorthand notation podman build -o -. A workaround is to redirect build messages to stderr:

$ podman build -o type=tar,dest=/dev/fd/3 /path/to/context 3>&1 >&2 | file -
STEP 1/1: FROM debian:stable
COMMIT
/dev/stdin: POSIX tar archive