Issue creating 'cd_content' iso with wsl

[Nova38]

When filing a bug, please include the following headings if possible. Any
example text in this template can be deleted.

Overview of the Issue

According to the docs it should be possible to run packer from wsl if the files are on the windows filesystem and if the packer chache dir is set to the users windows .packer folder. This is usefull as it would let provisioners run on it and use xorriso to generate the iso file that is created then mounted when cd_files/cd_content is used. The C:\tmp folder contains folders for each of the build runs that just contains the vm configs and vhdx files (even when stopped without cleanup). The ISO ends up in the /tmp folder not the windows tempfolder

/mnt/c/Users/user/$ PACKER_CACHE_DIR=/mnt/c/Users/user/.packer packer build ...

Reproduction Steps

The following are in windows

• Install hyper-v and wsl
• Install packer and the plugin

The following are in wsl

• Install packer and the plugin
• Install xorriso
• add the correct PACKER_CACHE_DIR to enveriment variables (either through a shell profile file, direnv, or just export the varialbe ). For instances /mnt/c/Users/user/$ PACKER_CACHE_DIR=/mnt/c/Users/user/.packer packer build ...
• Make a packer template on somewhere on the windows filesystem that has a hyper-v source that includes:
  • A gen 2 vm
  • making a custom iso by using the cd_content.
• Navigate to that folder
• Run PACKER_LOG=1 PACKER_LOG_PATH=./packer.log packer build -on-error=ask .

Plugin and Packer version

• packer: Packer v1.11.2

• packer-hyperv: "~> v1.1.4"

• wsl-packer: Packer v1.11.2

Simplified Packer Buildfile

packer {
  required_plugins {
    hyperv = {
      source  = "github.com/hashicorp/hyperv"
      version = "~> v1.1.4"
    }
  }
}
variable "username" {
  type    = string
  default = "vyos"
}

variable "password" {
  type    = string
  default = "vyos"
}

locals { instance_data = { data : "hi" } }

source "hyperv-iso" "router" {
  iso_urls = [
    "https://github.com/vyos/vyos-nightly-build/releases/download/1.5-rolling-202412160007/vyos-1.5-rolling-202412160007-generic-amd64.iso"
  ]
  iso_checksum = "DD96826D90AA2DBB1616533C4EBF8EEB4B629CFB2B5A15C6CA0167C547DDC7E1612C3C92F0F6044F7FBBA19DCC2F1F4E5C82D0794D3AB10E8CAECDBD087225C5"

  generation = 2
  enable_secure_boot = false

  shutdown_command = "echo y | shutdown "
  shutdown_timeout = "30m"
  switch_name      = "Default Switch"

  cd_files = ["vendor-data"]
  cd_content = {
    "meta-data" = jsonencode(local.instance_data)
  }
  cd_label = "cidata"

  ssh_username = "${var.username}"
  ssh_password = "${var.password}"

}

Operating system and Environment details

• OS: windows 11

• wsl-os: Ubuntu 22.04.5 LTS

• wsl-added-env: PACKER_CACHE_DIR=/mnt/c/Users/user/.cache/packer

Log Fragments and crash.log files

Failed to find the iso

2025/01/14 12:40:22 [INFO] Packer version: 1.11.2 [go1.21.12 linux amd64]
2025/01/14 12:40:22 Detected xdg config directory from env var: /home/user/.config
2025/01/14 12:40:22 [INFO] PACKER_CONFIG env var not set; checking the default config file path
2025/01/14 12:40:22 [INFO] PACKER_CONFIG env var set; attempting to open config file: /home/user/.packerconfig
2025/01/14 12:40:22 [WARN] Config file doesn't exist: /home/user/.packerconfig
2025/01/14 12:40:22 Detected xdg config directory from env var: /home/user/.config
2025/01/14 12:40:22 Detected xdg config directory from env var: /home/user/.config
2025/01/14 12:40:22 [INFO] Setting cache directory: /mnt/c/Users/user/.cache/packer
2025/01/14 12:40:22 [TRACE] listing potential installations for "github.com/hashicorp/hyperv" that match "~> v1.1.4". plugingetter.ListInstallationsOptions{PluginDirectory:"/home/user/.config/packer/plugins", BinaryInstallationOptions:plugingetter.BinaryInstallationOptions{APIVersionMajor:"5", APIVersionMinor:"0", OS:"linux", ARCH:"amd64", Ext:"", Checksummers:[]plugingetter.Checksummer{plugingetter.Checksummer{Type:"sha256", Hash:(*sha256.digest)(0xc000121200)}}, ReleasesOnly:false}}
2025/01/14 12:40:22 [TRACE] Found the following "github.com/hashicorp/hyperv" installations: [{/home/user/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 v1.1.4 x5.0}]
2025/01/14 12:40:22 [INFO] found external [iso vmcx] builders from hyperv plugin
2025/01/14 12:40:22 [TRACE] listing potential installations for  that match "". plugingetter.ListInstallationsOptions{PluginDirectory:"/home/user/.config/packer/plugins", BinaryInstallationOptions:plugingetter.BinaryInstallationOptions{APIVersionMajor:"5", APIVersionMinor:"0", OS:"linux", ARCH:"amd64", Ext:"", Checksummers:[]plugingetter.Checksummer{plugingetter.Checksummer{Type:"sha256", Hash:(*sha256.digest)(0xc0008d8000)}}, ReleasesOnly:false}}
2025/01/14 12:40:23 [INFO] found external [iso vmcx] builders from hyperv plugin
2025/01/14 12:40:23 [INFO] found external [-packer-default-plugin-name- clone iso] builders from proxmox plugin
2025/01/14 12:40:23 [INFO] found external [-packer-default-plugin-name-] builders from qemu plugin
2025/01/14 12:40:23 found external [-packer-default-plugin-name- local] provisioner from ansible plugin
2025/01/14 12:40:23 [INFO] found external [-packer-default-plugin-name-] builders from docker plugin
2025/01/14 12:40:23 [INFO] found external [import push save tag] post-processors from docker plugin
2025/01/14 12:40:23 [TRACE] validateValue: not active for username, so skipping
2025/01/14 12:40:23 [TRACE] validateValue: not active for password, so skipping
2025/01/14 12:40:23 [INFO] Starting external plugin /home/user/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 start builder iso
2025/01/14 12:40:23 Starting plugin: /home/user/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 []string{"/home/user/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64", "start", "builder", "iso"}
2025/01/14 12:40:23 Waiting for RPC address for: /home/user/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64
2025/01/14 12:40:23 Received unix RPC address for /home/user/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64: addr is /tmp/packer-plugin369221482
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 Plugin address: unix /tmp/packer-plugin369221482
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 Waiting for connection...
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 Serving a plugin connection...
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 [TRACE] starting builder iso
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 VMName: packer-router
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 DiskBlockSize: 32
2025/01/14 12:40:23 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:23 RamSize: 1024
2025/01/14 12:40:28 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:28 DiskSize: 40960
2025/01/14 12:40:28 [INFO] Starting internal plugin packer-provisioner-shell
2025/01/14 12:40:28 Starting plugin: /usr/bin/packer []string{"/usr/bin/packer", "execute", "packer-provisioner-shell"}
2025/01/14 12:40:28 Waiting for RPC address for: /usr/bin/packer
2025/01/14 12:40:28 packer-provisioner-shell plugin: [INFO] Packer version: 1.11.2 [go1.21.12 linux amd64]
2025/01/14 12:40:28 packer-provisioner-shell plugin: Detected xdg config directory from env var: /home/user/.config
2025/01/14 12:40:28 packer-provisioner-shell plugin: [INFO] PACKER_CONFIG env var not set; checking the default config file path
2025/01/14 12:40:28 packer-provisioner-shell plugin: [INFO] PACKER_CONFIG env var set; attempting to open config file: /home/user/.packerconfig
2025/01/14 12:40:28 packer-provisioner-shell plugin: [WARN] Config file doesn't exist: /home/user/.packerconfig
2025/01/14 12:40:28 packer-provisioner-shell plugin: Detected xdg config directory from env var: /home/user/.config
2025/01/14 12:40:28 packer-provisioner-shell plugin: Detected xdg config directory from env var: /home/user/.config
2025/01/14 12:40:28 packer-provisioner-shell plugin: [INFO] Setting cache directory: /mnt/c/Users/user/.cache/packer
2025/01/14 12:40:28 packer-provisioner-shell plugin: args: []string{"packer-provisioner-shell"}
2025/01/14 12:40:28 packer-provisioner-shell plugin: Plugin address: unix /tmp/packer-plugin465795622
2025/01/14 12:40:28 packer-provisioner-shell plugin: Waiting for connection...
2025/01/14 12:40:28 Received unix RPC address for /usr/bin/packer: addr is /tmp/packer-plugin465795622
2025/01/14 12:40:28 packer-provisioner-shell plugin: Serving a plugin connection...
2025/01/14 12:40:28 ui: hyperv-iso.router: output will be in this color.
2025/01/14 12:40:28 ui: 
2025/01/14 12:40:28 Build debug mode: false
2025/01/14 12:40:28 Force build: false
2025/01/14 12:40:28 On error: ask
2025/01/14 12:40:28 Waiting on builds to complete...
2025/01/14 12:40:28 Starting build run: hyperv-iso.router
2025/01/14 12:40:28 Running builder: hyperv-iso
2025/01/14 12:40:28 [INFO] (telemetry) Starting builder hyperv-iso.router
2025/01/14 12:40:28 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:28 Enter method: verifyPSVersion
2025/01/14 12:40:29 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:29 $host.version.Major output: 5
2025/01/14 12:40:29 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:29 Enter method: verifyPSHypervModule
2025/01/14 12:40:31 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:31 Enter method: verifyHypervPermissions
2025/01/14 12:40:32 ui: ==> hyperv-iso.router: Creating build directory...
2025/01/14 12:40:32 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:32 Created build directory: /tmp/hyperv223542900
2025/01/14 12:40:32 ui: ==> hyperv-iso.router: Retrieving ISO
2025/01/14 12:40:32 ui: ==> hyperv-iso.router: Trying https://github.com/vyos/vyos-nightly-build/releases/download/1.5-rolling-202412160007/vyos-1.5-rolling-202412160007-generic-amd64.iso
2025/01/14 12:40:32 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:32 Acquiring lock for: https://github.com/vyos/vyos-nightly-build/releases/download/1.5-rolling-202412160007/vyos-1.5-rolling-202412160007-generic-amd64.iso?checksum=sha512%3Add96826d90aa2dbb1616533c4ebf8eeb4b629cfb2b5a15c6ca0167c547ddc7e1612c3c92f0f6044f7fbba19dcc2f1f4e5c82d0794d3ab10e8caecdbd087225c5 (/mnt/c/Users/user/.cache/packer/5225799b83b37cf38ddf9f8d1295b30b2a362189.iso.lock)
2025/01/14 12:40:32 ui: ==> hyperv-iso.router: Trying https://github.com/vyos/vyos-nightly-build/releases/download/1.5-rolling-202412160007/vyos-1.5-rolling-202412160007-generic-amd64.iso?checksum=sha512%3Add96826d90aa2dbb1616533c4ebf8eeb4b629cfb2b5a15c6ca0167c547ddc7e1612c3c92f0f6044f7fbba19dcc2f1f4e5c82d0794d3ab10e8caecdbd087225c5
2025/01/14 12:40:45 ui: ==> hyperv-iso.router: https://github.com/vyos/vyos-nightly-build/releases/download/1.5-rolling-202412160007/vyos-1.5-rolling-202412160007-generic-amd64.iso?checksum=sha512%3Add96826d90aa2dbb1616533c4ebf8eeb4b629cfb2b5a15c6ca0167c547ddc7e1612c3c92f0f6044f7fbba19dcc2f1f4e5c82d0794d3ab10e8caecdbd087225c5 => /mnt/c/Users/user/.cache/packer/5225799b83b37cf38ddf9f8d1295b30b2a362189.iso
2025/01/14 12:40:45 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:45 Leaving retrieve loop for ISO
2025/01/14 12:40:45 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:45 No floppy files specified. Floppy disk will not be made.
2025/01/14 12:40:45 ui: ==> hyperv-iso.router: Creating switch 'Default Switch' if required...
2025/01/14 12:40:48 ui: ==> hyperv-iso.router:     switch 'Default Switch' already exists. Will not delete on cleanup...
2025/01/14 12:40:48 ui: ==> hyperv-iso.router: Creating virtual machine...
2025/01/14 12:40:52 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:40:52 No existing virtual harddrive, not attaching.
2025/01/14 12:41:27 ui: ==> hyperv-iso.router: Enabling Integration Service...
2025/01/14 12:41:39 ui: ==> hyperv-iso.router: Setting boot drive to os dvd drive C:\Users\user\.cache\packer\5225799b83b37cf38ddf9f8d1295b30b2a362189.iso ...
2025/01/14 12:41:45 ui: ==> hyperv-iso.router: Mounting os dvd drive C:\Users\user\.cache\packer\5225799b83b37cf38ddf9f8d1295b30b2a362189.iso ...
2025/01/14 12:41:52 ui: ==> hyperv-iso.router: Skipping mounting Integration Services Setup Disk...
2025/01/14 12:41:52 ui: ==> hyperv-iso.router: Creating CD disk...
2025/01/14 12:41:52 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:41:52 CD label is set to cidata
2025/01/14 12:41:52 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:41:52 CD path: /tmp/packer2197062562.iso
2025/01/14 12:41:52 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:41:52 Wrote 4 bytes to vendor-data
2025/01/14 12:41:52 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/01/14 12:41:52 Executing: /usr/bin/xorriso [-as genisoimage -rock -joliet -volid cidata -output /tmp/packer2197062562.iso /tmp/packer_to_cdrom3833706608]
2025/01/14 12:41:52 ui:     hyperv-iso.router: xorriso 1.5.4 : RockRidge filesystem manipulator, libburnia project.
2025/01/14 12:41:52 ui:     hyperv-iso.router: Drive current: -outdev 'stdio:/tmp/packer2197062562.iso'
2025/01/14 12:41:52 ui:     hyperv-iso.router: Media current: stdio file, overwriteable
2025/01/14 12:41:52 ui:     hyperv-iso.router: Media status : is blank
2025/01/14 12:41:52 ui:     hyperv-iso.router: Media summary: 0 sessions, 0 data blocks, 0 data,  814g free
2025/01/14 12:41:52 ui:     hyperv-iso.router: xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules
2025/01/14 12:41:52 ui:     hyperv-iso.router: Added to ISO image: directory '/'='/tmp/packer_to_cdrom3833706608'
2025/01/14 12:41:52 ui:     hyperv-iso.router: xorriso : UPDATE :       2 files added in 1 seconds
2025/01/14 12:41:52 ui:     hyperv-iso.router: xorriso : UPDATE :       2 files added in 1 seconds
2025/01/14 12:41:52 ui:     hyperv-iso.router: ISO image produced: 185 sectors
2025/01/14 12:41:52 ui:     hyperv-iso.router: Written to medium : 185 sectors at LBA 0
2025/01/14 12:41:52 ui:     hyperv-iso.router: Writing to 'stdio:/tmp/packer2197062562.iso' completed successfully.
2025/01/14 12:41:52 ui:     hyperv-iso.router: Done copying paths from CD_dirs
2025/01/14 12:41:52 ui: ==> hyperv-iso.router: Mounting secondary DVD images...
2025/01/14 12:42:00 ui error: ==> hyperv-iso.router: PowerShell error: Hyper-V\Add-VMDvdDrive : Failed to add device 'Virtual CD/DVD Disk'.
==> hyperv-iso.router: Attachment 'C:\tmp\packer2197062562.iso' not found. Error: 'The system cannot find the file specified.'.
==> hyperv-iso.router: 'packer-router' failed to add device 'Virtual CD/DVD Disk'. (Virtual machine ID 314555E4-A498-4559-9DBC-C448C48E8FE6)
==> hyperv-iso.router: 'packer-router': Attachment 'C:\tmp\packer2197062562.iso' not found. Error: 'The system cannot find the file 
==> hyperv-iso.router: specified.' (0x80070002). (Virtual machine ID 314555E4-A498-4559-9DBC-C448C48E8FE6)
==> hyperv-iso.router: At C:\Users\user\AppData\Local\Temp\powershell524264086.ps1:3 char:18
==> hyperv-iso.router: + ... ontroller = Hyper-V\Add-VMDvdDrive -VMName $vmName -path $isoPath -Pa ...
==> hyperv-iso.router: +                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
==> hyperv-iso.router:     + CategoryInfo          : NotSpecified: (:) [Add-VMDvdDrive], VirtualizationException
==> hyperv-iso.router:     + FullyQualifiedErrorId : Unspecified,Microsoft.HyperV.PowerShell.Commands.AddVMDvdDrive
2025/01/14 12:42:00 ui error: ==> hyperv-iso.router: PowerShell error: Hyper-V\Add-VMDvdDrive : Failed to add device 'Virtual CD/DVD Disk'.
==> hyperv-iso.router: Attachment 'C:\tmp\packer2197062562.iso' not found. Error: 'The system cannot find the file specified.'.
==> hyperv-iso.router: 'packer-router' failed to add device 'Virtual CD/DVD Disk'. (Virtual machine ID 314555E4-A498-4559-9DBC-C448C48E8FE6)
==> hyperv-iso.router: 'packer-router': Attachment 'C:\tmp\packer2197062562.iso' not found. Error: 'The system cannot find the file 
==> hyperv-iso.router: specified.' (0x80070002). (Virtual machine ID 314555E4-A498-4559-9DBC-C448C48E8FE6)
==> hyperv-iso.router: At C:\Users\user\AppData\Local\Temp\powershell524264086.ps1:3 char:18
==> hyperv-iso.router: + ... ontroller = Hyper-V\Add-VMDvdDrive -VMName $vmName -path $isoPath -Pa ...
==> hyperv-iso.router: +                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
==> hyperv-iso.router:     + CategoryInfo          : NotSpecified: (:) [Add-VMDvdDrive], VirtualizationException
==> hyperv-iso.router:     + FullyQualifiedErrorId : Unspecified,Microsoft.HyperV.PowerShell.Commands.AddVMDvdDrive
2025/01/14 12:42:00 ui: ==> hyperv-iso.router: Step "StepMountSecondaryDvdImages" failed
2025/01/14 12:42:00 ui: ask: ==> hyperv-iso.router: [c] Clean up and exit, [a] abort without cleanup, or [r] retry step (build may fail even if retry succeeds)?

[fatshark-pca]

Hi, I am running into this issue too but with floppy. The problem seems caused by the plugin creating the file in the WSL filesystem, which it then doesn't correctly provide to the PowerShell commands.

• I need to provide an answer file to automatically install Windows
• I can't use CD content because my company's antivirus quarantines unsigned iso files, so I am stuck with using floppy
• I need to use WSL because I want to use the ansible provisioner, which does not work on Windows

Windows 11
Packer 1.13.1
Packer hyperv plugin 1.1.4

Buildfile

packer {
  required_plugins {
    hyperv = {
      version = "= 1.1.4"
      source  = "github.com/hashicorp/hyperv"
    }
  }
}

source "hyperv-iso" "windows" {
  generation  = 1

  iso_url      = "https://go.microsoft.com/fwlink/?linkid=2293312&clcid=0x409&culture=en-us&country=us"
  iso_checksum = "d0ef4502e350e3c6c53c15b1b3020d38a5ded011bf04998e950720ac8579b23d"

  floppy_files = ["scripts/autounattend.xml"]

  ssh_username = "Administrator"
}

build {
  sources = ["source.hyperv-iso.windows"]
}

Logs

An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.

2025/07/09 15:30:46 [INFO] Packer version: 1.13.1 [go1.23.2 linux amd64]
2025/07/09 15:30:46 [INFO] PACKER_CONFIG env var not set; checking the default config file path
2025/07/09 15:30:46 [INFO] PACKER_CONFIG env var set; attempting to open config file: /home/ubuntu/.packerconfig
2025/07/09 15:30:46 [WARN] Config file doesn't exist: /home/ubuntu/.packerconfig
2025/07/09 15:30:46 [INFO] Setting cache directory: /mnt/c/Users/User/source/repos/project/infrastructure/packer/packer_cache
2025/07/09 15:30:46 [TRACE] listing potential installations for "github.com/hashicorp/hyperv" that match "= 1.1.4". plugingetter.ListInstallationsOptions{PluginDirectory:"/home/ubuntu/.config/packer/plugins", BinaryInstallationOptions:plugingetter.BinaryInstallationOptions{APIVersionMajor:"5", APIVersionMinor:"0", OS:"linux", ARCH:"amd64", Ext:"", Checksummers:[]plugingetter.Checksummer{plugingetter.Checksummer{Type:"sha256", Hash:(*sha256.digest)(0xc00077c000)}}, ReleasesOnly:false}}
2025/07/09 15:30:46 [TRACE] Found the following "github.com/hashicorp/hyperv" installations: [{/home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 v1.1.4 x5.0}]
2025/07/09 15:30:46 [INFO] found external [iso vmcx] builders from hyperv plugin
2025/07/09 15:30:46 plugin "/home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64" does not support Protobuf, forcing use of Gob
2025/07/09 15:30:46 [TRACE] listing potential installations for <nil> that match "". plugingetter.ListInstallationsOptions{PluginDirectory:"/home/ubuntu/.config/packer/plugins", BinaryInstallationOptions:plugingetter.BinaryInstallationOptions{APIVersionMajor:"5", APIVersionMinor:"0", OS:"linux", ARCH:"amd64", Ext:"", Checksummers:[]plugingetter.Checksummer{plugingetter.Checksummer{Type:"sha256", Hash:(*sha256.digest)(0xc000156000)}}, ReleasesOnly:false}}
2025/07/09 15:30:46 [INFO] found external [iso vmcx] builders from hyperv plugin
2025/07/09 15:30:46 found external [-packer-default-plugin-name-] provisioner from windows-update plugin
2025/07/09 15:30:46 found external [-packer-default-plugin-name- local] provisioner from ansible plugin
2025/07/09 15:30:46 [INFO] Starting external plugin /home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 start builder iso
2025/07/09 15:30:46 Starting plugin: /home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 []string{"/home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64", "start", "builder", "iso"}
2025/07/09 15:30:46 Waiting for RPC address for: /home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 Plugin address: unix /tmp/packer-plugin994851962
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 Waiting for connection...
2025/07/09 15:30:46 Received unix RPC address for /home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64: addr is /tmp/packer-plugin994851962
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 Serving a plugin connection...
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 [TRACE] starting builder iso
2025/07/09 15:30:46 [DEBUG] - common: receiving ConfigSpec as gob
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 VMName: packer-windows
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 DiskBlockSize: 32
2025/07/09 15:30:46 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:46 RamSize: 2048
2025/07/09 15:30:47 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:47 DiskSize: 40960
2025/07/09 15:30:47 [DEBUG] - common: receiving ConfigSpec as gob

  on hyperv-iso.pkr.hcl line 10:
Warning: Hyper-V might fail to create a VM if there is not enough free memory in the system.
  (source code not available)

Warning: A shutdown_command was not specified. Without a shutdown command, Packer
will forcibly halt the virtual machine, which may result in data loss.

  on hyperv-iso.pkr.hcl line 10:
  (source code not available)

2025/07/09 15:30:47 Build debug mode: false
2025/07/09 15:30:47 Force build: true
2025/07/09 15:30:47 On error:
2025/07/09 15:30:47 Waiting on builds to complete...
2025/07/09 15:30:47 Starting build run: hyperv-iso.windows

  on hyperv-iso.pkr.hcl line 10:
  (source code not available)

Warning: A shutdown_command was not specified. Without a shutdown command, Packer
will forcibly halt the virtual machine, which may result in data loss.

  on hyperv-iso.pkr.hcl line 10:
  (source code not available)


hyperv-iso.windows: output will be in this color.

2025/07/09 15:30:47 Running builder: hyperv-iso
2025/07/09 15:30:47 [INFO] (telemetry) Starting builder hyperv-iso.windows
2025/07/09 15:30:47 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:47 Enter method: verifyPSVersion
2025/07/09 15:30:47 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:47 $host.version.Major output: 5
2025/07/09 15:30:47 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:47 Enter method: verifyPSHypervModule
2025/07/09 15:30:47 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:47 Enter method: verifyHypervPermissions
==> hyperv-iso.windows: Creating build directory...
2025/07/09 15:30:48 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:48 Created build directory: /tmp/hyperv914837846
==> hyperv-iso.windows: Retrieving ISO
==> hyperv-iso.windows: Trying https://go.microsoft.com/fwlink/?linkid=2293312&clcid=0x409&culture=en-us&country=us
2025/07/09 15:30:48 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:30:48 Acquiring lock for: https://go.microsoft.com/fwlink/?checksum=sha256%!A(MISSING)d0ef4502e350e3c6c53c15b1b3020d38a5ded011bf04998e950720ac8579b23d&clcid=0x409&country=us&culture=en-us&linkid=2293312 (/mnt/c/Users/User/source/repos/project/infrastructure/packer/packer_cache/45173890bb9e0fc063f71cfb6d5ec40a0210e2d9.iso.lock)
==> hyperv-iso.windows: Trying https://go.microsoft.com/fwlink/?checksum=sha256%3Ad0ef4502e350e3c6c53c15b1b3020d38a5ded011bf04998e950720ac8579b23d&clcid=0x409&country=us&culture=en-us&linkid=2293312
==> hyperv-iso.windows: https://go.microsoft.com/fwlink/?checksum=sha256%3Ad0ef4502e350e3c6c53c15b1b3020d38a5ded011bf04998e950720ac8579b23d&clcid=0x409&country=us&culture=en-us&linkid=2293312 => /mnt/c/Users/User/source/repos/project/infrastructure/packer/packer_cache/45173890bb9e0fc063f71cfb6d5ec40a0210e2d9.iso
2025/07/09 15:31:19 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:19 Leaving retrieve loop for ISO
==> hyperv-iso.windows: Creating floppy disk...
2025/07/09 15:31:19 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:19 Floppy path: /tmp/packer4063285095
2025/07/09 15:31:19 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:19 Initializing block device backed by temporary file
2025/07/09 15:31:19 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:19 Formatting the block device with a FAT filesystem...
2025/07/09 15:31:19 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:19 Initializing FAT filesystem on block device
2025/07/09 15:31:19 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:19 Reading the root directory from the filesystem
==> hyperv-iso.windows: Copying files flatly from floppy_files
==> hyperv-iso.windows: Copying file: scripts/autounattend.pkrtpl.hcl
==> hyperv-iso.windows: Done copying files from floppy_files
==> hyperv-iso.windows: Collecting paths from floppy_dirs
==> hyperv-iso.windows: Resulting paths from floppy_dirs : []
==> hyperv-iso.windows: Done copying paths from floppy_dirs
==> hyperv-iso.windows: Copying files from floppy_content
==> hyperv-iso.windows: Done copying files from floppy_content
==> hyperv-iso.windows: Creating switch 'Default Switch' if required...
==> hyperv-iso.windows:     switch 'Default Switch' already exists. Will not delete on cleanup...
==> hyperv-iso.windows: Creating virtual machine...
2025/07/09 15:31:21 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:21 No existing virtual harddrive, not attaching.
==> hyperv-iso.windows: Enabling Integration Service...
==> hyperv-iso.windows: Mounting os dvd drive C:\Users\User\source\repos\project\infrastructure\packer\packer_cache\45173890bb9e0fc063f71cfb6d5ec40a0210e2d9.iso ...
2025/07/09 15:31:31 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:31 Copying floppy to temp location: /tmp/hyperv1827470559/floppy.vfd
==> hyperv-iso.windows: Mounting floppy drive...
==> hyperv-iso.windows: Clean up os dvd drive...
==> hyperv-iso.windows: Unregistering and deleting virtual machine...
2025/07/09 15:31:34 packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64 plugin: 2025/07/09 15:31:34 Deleting floppy disk: /tmp/packer4063285095
==> hyperv-iso.windows: Deleting output directory...
==> hyperv-iso.windows: Deleting build directory...
2025/07/09 15:31:34 [INFO] (telemetry) ending hyperv-iso.windows
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
'packer-windows' failed to add device 'Virtual Floppy Disk'. (Virtual machine ID C5A62C65-02B3-4ACC-96AF-FE8A5E661A30)
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
At C:\Users\User\AppData\Local\Temp\powershell4186590076.ps1:3 char:1
+ Hyper-V\Set-VMFloppyDiskDrive -VMName $vmName -Path $path
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Set-VMFloppyDiskDrive], VirtualizationException
    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMFloppyDiskDrive
==> Wait completed after 47 seconds 244 milliseconds
2025/07/09 15:31:34 machine readable: error-count []string{"1"}
==> Some builds didn't complete successfully and had errors:
Build 'hyperv-iso.windows' errored after 47 seconds 244 milliseconds: Error mounting floppy drive: PowerShell error: Hyper-V\Set-VMFloppyDiskDrive : Failed to add device 'Virtual Floppy Disk'.
2025/07/09 15:31:34 machine readable: hyperv-iso.windows,error []string{"Error mounting floppy drive: PowerShell error: Hyper-V\\Set-VMFloppyDiskDrive : Failed to add device 'Virtual Floppy Disk'.\r\nAn absolute path must be specified in order to allocate from the root Floppy Disk Image pool.\r\n'packer-windows' failed to add device 'Virtual Floppy Disk'. (Virtual machine ID C5A62C65-02B3-4ACC-96AF-FE8A5E661A30)\r\nAn absolute path must be specified in order to allocate from the root Floppy Disk Image pool.\r\nAt C:\\Users\\User\\AppData\\Local\\Temp\\powershell4186590076.ps1:3 char:1\r\n+ Hyper-V\\Set-VMFloppyDiskDrive -VMName $vmName -Path $path\r\n+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n    + CategoryInfo          : InvalidArgument: (:) [Set-VMFloppyDiskDrive], VirtualizationException\r\n    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMFloppyDiskDrive"}
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
'packer-windows' failed to add device 'Virtual Floppy Disk'. (Virtual machine ID C5A62C65-02B3-4ACC-96AF-FE8A5E661A30)
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
At C:\Users\User\AppData\Local\Temp\powershell4186590076.ps1:3 char:1
+ Hyper-V\Set-VMFloppyDiskDrive -VMName $vmName -Path $path
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Set-VMFloppyDiskDrive], VirtualizationException
'packer-windows' failed to add device 'Virtual Floppy Disk'. (Virtual machine ID C5A62C65-02B3-4ACC-96AF-FE8A5E661A30)
    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMFloppyDiskDrive
==> Builds finished but no artifacts were created.
2025/07/09 15:31:34 [INFO] (telemetry) Finalizing.
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
At C:\Users\User\AppData\Local\Temp\powershell4186590076.ps1:3 char:1
+ Hyper-V\Set-VMFloppyDiskDrive -VMName $vmName -Path $path
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Set-VMFloppyDiskDrive], VirtualizationException
    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMFloppyDiskDrive

==> Wait completed after 47 seconds 244 milliseconds

==> Some builds didn't complete successfully and had errors:
--> hyperv-iso.windows: Error mounting floppy drive: PowerShell error: Hyper-V\Set-VMFloppyDiskDrive : Failed to add device 'Virtual Floppy Disk'.
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
'packer-windows' failed to add device 'Virtual Floppy Disk'. (Virtual machine ID C5A62C65-02B3-4ACC-96AF-FE8A5E661A30)
An absolute path must be specified in order to allocate from the root Floppy Disk Image pool.
At C:\Users\User\AppData\Local\Temp\powershell4186590076.ps1:3 char:1
+ Hyper-V\Set-VMFloppyDiskDrive -VMName $vmName -Path $path
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Set-VMFloppyDiskDrive], VirtualizationException
    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMFloppyDiskDrive

==> Builds finished but no artifacts were created.
2025/07/09 15:31:34 waiting for all plugin processes to complete...
2025/07/09 15:31:34 /home/ubuntu/.config/packer/plugins/github.com/hashicorp/hyperv/packer-plugin-hyperv_v1.1.4_x5.0_linux_amd64: plugin process exited

[fatshark-pca]

@camjjack @nywilken out of curiosity, when you tested WSL2 compatibility released in 1.1.2 with #57, did you test with attachments?

[CorruptBandit]

I am also running into this problem, it seems to prefix the path to powershell with C: which breaks it.

[CorruptBandit]

Upon research this was actually fixed by

Merge pull request #145 from trippsc2/main

Added missing WSL path conversions

However this was not included in Release 1.1.15, compiling from main works fine :)