"--no-hostname" option does not work as expected while building a container using podman

[sarmahaj]

Issue Description

If we try to build a container using podman with option --no-hostname as mentioned in docs https://docs.podman.io/en/latest/markdown/podman-build.1.html , it is expected that /etc/hostname file will not be created but an empty file is created.

Steps to reproduce the issue

Steps to reproduce the issue

1. Build a container with --no-hostname option.
   podman build --authfile ~/pull-secret.json --no-hostname -t "baseos" -f Containerfile
2. Run the container
   podman run -d --name baseos localhost/baseos:latest
3. Export and check for /etc/hostname file.
   mkdir extracted-baseos
podman export -o baseos.tar baseos
tar -xf baseos.tar -C extracted-baseos
ls extracted-baseos/etc/hostname

My container file contains image from FROM registry.redhat.io/rhel9/rhel-bootc:latest

Describe the results you received

I can see an empty /etc/hostname file is present .

Describe the results you expected

/etc/hostname file is not created.

podman info output

host:
  arch: amd64
  buildahVersion: 1.33.5
  cgroupControllers:
  - cpuset
  - cpu
  - io
  - memory
  - hugetlb
  - pids
  - rdma
  - misc
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.10-1.el9.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.10, commit: fb8c4bf50dbc044a338137871b096eea8041a1fa'
  cpuUtilization:
    idlePercent: 98.12
    systemPercent: 0.49
    userPercent: 1.4
  cpus: 2
  databaseBackend: sqlite
  distribution:
    distribution: rhel
    version: "9.4"
  eventLogger: journald
  freeLocks: 2043
  hostname: localhost.localdomain
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.14.0-427.13.1.el9_4.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 569892864
  memTotal: 7958319104
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.9.0-1.el9.x86_64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.9.0
    package: netavark-1.10.3-1.el9.x86_64
    path: /usr/libexec/podman/netavark
    version: netavark 1.10.3
  ociRuntime:
    name: crun
    package: crun-1.14.3-1.el9.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.14.3
      commit: 1961d211ba98f532ea52d2e80f4c20359f241a98
      rundir: /run/user/0/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20240806.gee36266-2.el9.x86_64
    version: |
      pasta 0^20240806.gee36266-2.el9.x86_64
      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/podman/podman.sock
  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: false
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.2.3-1.el9.x86_64
    version: |-
      slirp4netns version 1.2.3
      commit: c22fde291bb35b354e6ca44d13be181c76a0a432
      libslirp: 4.4.0
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.2
  swapFree: 2132975616
  swapTotal: 2147479552
  uptime: 5h 15m 10.00s (Approximately 0.21 days)
  variant: ""
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  localhost:5000:
    Blocked: false
    Insecure: true
    Location: localhost:5000
    MirrorByDigestOnly: false
    Mirrors: null
    Prefix: localhost:5000
    PullFromMirror: ""
  search:
  - registry.access.redhat.com
  - registry.redhat.io
  - docker.io
store:
  configFile: /etc/containers/storage.conf
  containerStore:
    number: 5
    paused: 0
    running: 3
    stopped: 2
  graphDriverName: overlay
  graphOptions:
    overlay.mountopt: nodev,metacopy=on
  graphRoot: /var/lib/containers/storage
  graphRootAllocated: 79385591808
  graphRootUsed: 34211041280
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "true"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 12
  runRoot: /run/containers/storage
  transientStore: false
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 4.9.4-dev
  Built: 1708422076
  BuiltTime: Tue Feb 20 09:41:16 2024
  GitCommit: ""
  GoVersion: go1.21.7 (Red Hat 1.21.7-1.el9)
  Os: linux
  OsArch: linux/amd64
  Version: 4.9.4-dev

Podman in a container

No

Privileged Or Rootless

Privileged

Upstream Latest Release

No

Additional environment details

Additional environment details

Additional information

Additional information like issue happens only occasionally or issue happens with a particular architecture or on a particular setting

[sarmahaj]

@rhatdan Thanks for adding this ,tested works all good 👍