[Bug 1913012] [NEW] Installed firmware descriptor files contain (invalid) relative paths

[Alain Kalker]

Public bug reported:

Unless the Qemu build is configured using `./configure --datadir=<path>
where <path> is some absolute path which is a subdirectory of <prefix>,
the resulting installed firmware descriptor files contain relative paths
for their `mapping.filename` properties. These relative paths will not
be accepted as valid by tools like `virt-install`, resulting in the
inability to configure new VMs using these firmware descriptors.

# QEMU version
$ qemu-system-x86_64 -version
QEMU emulator version 5.2.0

(I've also reproduced the issue with QEMU built from Git master @
v5.2.0-1300-g0e32462630, see next comment.)

# OS version
Void Linux x86_64 (glibc)

Steps to reproduce (with results on my system):

# Verify the symptom

$ virt-install --boot firmware=efi --disk none --memory 2048
Using default --name vm4
WARNING  No operating system detected, VM performance may suffer. Specify an OS 
with --os-variant for optimal results.

Starting install...
ERROR    Failed to open file 'share/qemu/edk2-i386-vars.fd': No such file or 
directory
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///session start vm4
otherwise, please restart your installation.

# Verify most likely cause

$ grep filename /usr/share/qemu/firmware/*i386*.json 
/usr/share/qemu/firmware/50-edk2-i386-secure.json:            "filename": 
"share/qemu/edk2-i386-secure-code.fd",
/usr/share/qemu/firmware/50-edk2-i386-secure.json:            "filename": 
"share/qemu/edk2-i386-vars.fd",
/usr/share/qemu/firmware/60-edk2-i386.json:            "filename": 
"share/qemu/edk2-i386-code.fd",
/usr/share/qemu/firmware/60-edk2-i386.json:            "filename": 
"share/qemu/edk2-i386-vars.fd",

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1913012

Title:
  Installed firmware descriptor files contain (invalid) relative paths

Status in QEMU:
  New

Bug description:
  Unless the Qemu build is configured using `./configure
  --datadir=<path> where <path> is some absolute path which is a
  subdirectory of <prefix>, the resulting installed firmware descriptor
  files contain relative paths for their `mapping.filename` properties.
  These relative paths will not be accepted as valid by tools like
  `virt-install`, resulting in the inability to configure new VMs using
  these firmware descriptors.

  # QEMU version
  $ qemu-system-x86_64 -version
  QEMU emulator version 5.2.0

  (I've also reproduced the issue with QEMU built from Git master @
  v5.2.0-1300-g0e32462630, see next comment.)

  # OS version
  Void Linux x86_64 (glibc)

  Steps to reproduce (with results on my system):

  # Verify the symptom

  $ virt-install --boot firmware=efi --disk none --memory 2048
  Using default --name vm4
  WARNING  No operating system detected, VM performance may suffer. Specify an 
OS with --os-variant for optimal results.

  Starting install...
  ERROR    Failed to open file 'share/qemu/edk2-i386-vars.fd': No such file or 
directory
  Domain installation does not appear to have been successful.
  If it was, you can restart your domain by running:
    virsh --connect qemu:///session start vm4
  otherwise, please restart your installation.

  # Verify most likely cause

  $ grep filename /usr/share/qemu/firmware/*i386*.json 
  /usr/share/qemu/firmware/50-edk2-i386-secure.json:            "filename": 
"share/qemu/edk2-i386-secure-code.fd",
  /usr/share/qemu/firmware/50-edk2-i386-secure.json:            "filename": 
"share/qemu/edk2-i386-vars.fd",
  /usr/share/qemu/firmware/60-edk2-i386.json:            "filename": 
"share/qemu/edk2-i386-code.fd",
  /usr/share/qemu/firmware/60-edk2-i386.json:            "filename": 
"share/qemu/edk2-i386-vars.fd",

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