Misleading error message when building a nonexistent Containerfile

[jawnsy]

Issue Description

When running a build from a context that does not include a Containerfile, users get a friendly error message. However, when attempting to run a nonexistent Containerfile, users get an error message referencing a path in /var/tmp. This may be a quirk of running Podman on MacOS based on underlying volume mount details, since Podman is actually running inside a VM.

Steps to reproduce the issue

I'm running Podman on MacOS, installed via Homebrew.

When attempting to build from a context where there is no Containerfile, users get a nice error message:

$ podman build .
Error: no Containerfile or Dockerfile specified or found in context directory, /Users/jonathan.yu/Projects/foo: no such file or directory

However, when doing the same using a Containerfile specified using -f, we get different output:

$ podman build -f foo
Error: stat /var/tmp/libpod_builder2347678443/build/foo: no such file or directory

To reproduce, simply run this on MacOS: podman build -f foo where the file foo does not exist.

Describe the results you received

The error message references a path that the user knows nothing about:

Error: stat /var/tmp/libpod_builder2347678443/build/foo: no such file or directory

Describe the results you expected

I expected an error message in my home directory, for example:

Error: stat /Users/jonathan.yu/Projects/foo/foo: no such file or directory

Or, perhaps better, a friendly error message modeling the one that appears when running podman build . from a context that does not include a Containerfile:

Error: the specified Contaninerfile or Dockerfile does not exist, /Users/jonathan.yu/Projects/foo/foo: no such file or directory

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: 94.05
    systemPercent: 3.3
    userPercent: 2.65
  cpus: 6
  databaseBackend: sqlite
  distribution:
    distribution: fedora
    variant: coreos
    version: "40"
  eventLogger: journald
  freeLocks: 2048
  hostname: localhost.localdomain
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 1000000
    uidmap:
    - container_id: 0
      host_id: 502
      size: 1
    - container_id: 1
      host_id: 100000
      size: 1000000
  kernel: 6.8.11-300.fc40.aarch64
  linkmode: dynamic
  logDriver: journald
  memFree: 1510846464
  memTotal: 2044387328
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.11.0-1.20240531102943328308.main.4.g6838c50.fc40.aarch64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.12.0-dev
    package: netavark-1.11.0-1.20240606174759319307.main.8.gfebe31a.fc40.aarch64
    path: /usr/libexec/podman/netavark
    version: netavark 1.12.0-dev
  ociRuntime:
    name: crun
    package: crun-1.15-1.20240607090105650503.main.32.gea54402.fc40.aarch64
    path: /usr/bin/crun
    version: |-
      crun version UNKNOWN
      commit: 7cfd0aeb40e4605b6b0ee0afd9cfca80f9c5f68a
      rundir: /run/user/502/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-0^20240510.g7288448-1.fc40.aarch64
    version: |
      pasta 0^20240510.g7288448-1.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: true
    path: /run/user/502/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: true
  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: 2.5.3
  swapFree: 0
  swapTotal: 0
  uptime: 0h 0m 20.00s
  variant: v8
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - docker.io
store:
  configFile: /var/home/core/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /var/home/core/.local/share/containers/storage
  graphRootAllocated: 106769133568
  graphRootUsed: 4569096192
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 0
  runRoot: /run/user/502/containers
  transientStore: false
  volumePath: /var/home/core/.local/share/containers/storage/volumes
version:
  APIVersion: 5.1.1
  Built: 1717459200
  BuiltTime: Mon Jun  3 17:00:00 2024
  GitCommit: ""
  GoVersion: go1.22.3
  Os: linux
  OsArch: linux/arm64
  Version: 5.1.1

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

Yes

Additional environment details

Running on MacOS installed via Homebrew

$ brew info podman
==> podman: stable 5.1.1 (bottled), HEAD
Tool for managing OCI containers and pods
https://podman.io/
Installed
/opt/homebrew/Cellar/podman/5.1.1 (200 files, 74MB) *
  Poured from bottle using the formulae.brew.sh API on 2024-06-07 at 09:20:17
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/p/podman.rb
License: Apache-2.0 and GPL-3.0-or-later
==> Dependencies
Build: go ✘, go-md2man ✘, make ✘
==> Requirements
Required: macOS >= 13 (or Linux) ✔
==> Options
--HEAD
	Install HEAD version
==> Caveats
        In order to run containers locally, podman depends on a Linux kernel.
        One can be started manually using `podman machine` from this package.
        To start a podman VM automatically at login, also install the cask
        "podman-desktop".

Bash completion has been installed to:
  /opt/homebrew/etc/bash_completion.d
==> Analytics
install: 19,867 (30 days), 55,200 (90 days), 213,495 (365 days)
install-on-request: 17,139 (30 days), 47,660 (90 days), 185,015 (365 days)

Running the latest podman machine image:

$ podman machine info
host:
    arch: arm64
    currentmachine: podman-machine-default
    defaultmachine: podman-machine-default
    eventsdir: /var/folders/x6/fxyfq2d97nbdvp6vfv7tvzcm0000gp/T/storage-run-502/podman
    machineconfigdir: /Users/jonathan.yu/.config/containers/podman/machine/applehv
    machineimagedir: /Users/jonathan.yu/.local/share/containers/podman/machine/applehv
    machinestate: Running
    numberofmachines: 1
    os: darwin
    vmtype: applehv
version:
    apiversion: 5.1.1
    version: 5.1.1
    goversion: go1.22.3
    gitcommit: bda6eb03dcbcf12a5b7ae004c1240e38dd056d24
    builttime: Tue Jun  4 12:54:07 2024
    built: 1717530847
    osarch: darwin/arm64
    os: darwin

Additional information

I only tested on MacOS and my guess is that this is specific to non-Windows OSes.