[Bug 2068077] [NEW] initramfs-tools can't identify root filesystem type

[Brett Holman]

Public bug reported:

When I attempt to regenerate an initramfs for a new root filsystem,
update-initramfs is unable to identify the filesystem type of this
initramfs.

```
# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-5.15.0-1059-kvm
W: Couldn't identify type of root file system for fsck hook
W: mkconf: MD subsystem is not loaded, thus I cannot scan for arrays.
W: mdadm: failed to auto-generate temporary mdadm.conf file.
```

the mounted filesystem:
```
# cat /proc/mounts | grep xfs
/dev/sda1 / xfs rw,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
```

fstab:
```
# cat /etc/fstab | grep xfs
LABEL=cloudimg-rootfs	/	 xfs    defaults	0 1
```

cmdline:
```
BOOT_IMAGE=/boot/vmlinuz-5.15.0-1059-kvm root=PARTUUID=575c9681-fb9d-457c-a3b5-407dda61a919 ro console=tty1 console=ttyS0 panic=-1
```


The failure is in hooks/fsck when it calls resolve_device(). The function returns 1 and echos nothing because it has a LABEL, not a UUID or PARTUUID.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: initramfs-tools 0.140ubuntu13.4
ProcVersionSignature: Ubuntu 5.15.0-1059.64-kvm 5.15.149
Uname: Linux 5.15.0-1059-kvm x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Wed Jun  5 01:25:29 2024
PackageArchitecture: all
ProcEnviron:
 TERM=vt220
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: initramfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug jammy uec-images

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https://bugs.launchpad.net/bugs/2068077

Title:
  initramfs-tools can't identify root filesystem type

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  When I attempt to regenerate an initramfs for a new root filsystem,
  update-initramfs is unable to identify the filesystem type of this
  initramfs.

  ```
  # update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-5.15.0-1059-kvm
  W: Couldn't identify type of root file system for fsck hook
  W: mkconf: MD subsystem is not loaded, thus I cannot scan for arrays.
  W: mdadm: failed to auto-generate temporary mdadm.conf file.
  ```

  the mounted filesystem:
  ```
  # cat /proc/mounts | grep xfs
  /dev/sda1 / xfs rw,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
  ```

  fstab:
  ```
  # cat /etc/fstab | grep xfs
  LABEL=cloudimg-rootfs	/	 xfs    defaults	0 1
  ```

  cmdline:
  ```
  BOOT_IMAGE=/boot/vmlinuz-5.15.0-1059-kvm root=PARTUUID=575c9681-fb9d-457c-a3b5-407dda61a919 ro console=tty1 console=ttyS0 panic=-1
  ```

  
  The failure is in hooks/fsck when it calls resolve_device(). The function returns 1 and echos nothing because it has a LABEL, not a UUID or PARTUUID.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: initramfs-tools 0.140ubuntu13.4
  ProcVersionSignature: Ubuntu 5.15.0-1059.64-kvm 5.15.149
  Uname: Linux 5.15.0-1059-kvm x86_64
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Wed Jun  5 01:25:29 2024
  PackageArchitecture: all
  ProcEnviron:
   TERM=vt220
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: initramfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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