lvdisplay does not respect --reportformat

[drleq]

Version
OS: Alma Linux 9.3

$ sudo lvdisplay --version
  LVM version:     2.03.21(2) (2023-04-21)
  Library version: 1.02.195 (2023-04-21)
  Driver version:  4.48.0
  Configuration:   ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-default-dm-run-dir=/run --with-default-run-dir=/run/lvm --with-default-pid-dir=/run --with-default-locking-dir=/run/lock/lvm --with-usrlibdir=/usr/lib64 --enable-fsadm --enable-write_install --with-user= --with-group= --with-device-uid=0 --with-device-gid=6 --with-device-mode=0660 --enable-pkgconfig --enable-cmdlib --enable-dmeventd --enable-blkid_wiping --with-udevdir=/usr/lib/udev/rules.d --enable-udev_sync --with-thin=internal --with-cache=internal --enable-lvmpolld --enable-lvmlockd-dlm --enable-lvmlockd-dlmcontrol --enable-lvmlockd-sanlock --enable-dbus-service --enable-notify-dbus --enable-dmfilemapd --with-writecache=internal --with-vdo=internal --with-vdo-format=/usr/bin/vdoformat --with-integrity=internal --with-default-use-devices-file=1 --disable-silent-rules --enable-app-machineid --enable-editline --disable-readline

Description
Previously, we have used pvdisplay --reportformat json to gather information about LVMs on a host. After moving to Alma Linux 9 this no longer works, although the lvmreport man page claims that it should.

$ sudo lvdisplay --reportformat json
  --- Logical volume ---
  LV Path                /dev/almalinux/swap
  LV Name                swap
  VG Name                almalinux
  LV UUID                gJbgHN-YWDp-Yl08-czwY-0mDN-ecM1-iPNGDy
  LV Write Access        read/write
  LV Creation host, time OPSLSALMA93001, 2023-12-14 12:43:23 +0000
  LV Status              available
  # open                 2
  LV Size                5.00 GiB
  Current LE             1280
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     4096
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/almalinux/root
  LV Name                root
  VG Name                almalinux
  LV UUID                s5rLbo-jBZe-76Oh-m8nj-3Dvz-1RTE-TCmjuq
  LV Write Access        read/write
  LV Creation host, time OPSLSALMA93001, 2023-12-14 12:43:23 +0000
  LV Status              available
  # open                 1
  LV Size                <44.00 GiB
  Current LE             11263
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     4096
  Block device           253:0

Workaround
Use the lvs command instead of lvdisplay.

[prajnoha]

The pvdisplay does not use reporting infrastructure unlike pvs/vgs/lvs/lvm fullreport. Actually, the --reportformat should not be allowed with *display commands at all. If it worked before, maybe it just switched to pvs automatically. But if you want proper reporting and with JSON format, please use the pvs/vgs/lvs. The *display commands are supposed to have only a single human-readable format.