[Libguestfs] [PATCH] convert_linux: translate the first CD-ROM's references in boot conf files

[Laszlo Ersek]

On 12/15/21 16:14, Laszlo Ersek wrote:
> Before posting v2, I intended to test it :) , so I installed a new RHEL5 guest, and tried to run virt-v2v (with the v2 patch) on it:
> 
> virt-v2v -i libvirt -o local -os ~/output rhel5.11
> 
> Unfortunately, things break before my code gets a chance to run; here:
> 
>   (* Fail early if i_apps is empty.  Certain steps such as kernel
>    * detection won't work without this.  If the list is empty it
>    * likely indicates that libguestfs inspection is broken for
>    * this guest.  See for example RHBZ#1965147.
>    *)
>   if inspect.i_apps = [] then
>     error (f_"inspection of the package database failed for ...
> 
> This seems to come from an empty apps list, from "convert/inspect_source.ml", which in turn invokes "g#inspect_list_applications2".
> 
> I turned to guestfish, and ran the following manually:
> 
> inspect-os
> inspect-get-mountpoints /dev/VolGroup00/LogVol00
> inspect-list-applications2 /dev/VolGroup00/LogVol00
> 
> Indeed the last command does not return anything. I turned on "verbose" and "trace" then, and then I see a failure in the daemon:
> 
> libguestfs: trace: inspect_list_applications2 "/dev/VolGroup00/LogVol00"
> libguestfs: trace: inspect_get_type "/dev/VolGroup00/LogVol00"
> libguestfs: trace: inspect_get_type = "linux"
> libguestfs: trace: inspect_get_package_format "/dev/VolGroup00/LogVol00"
> libguestfs: trace: inspect_get_package_format = "rpm"
> libguestfs: trace: internal_list_rpm_applications
> \x1b[31;1merror: \x1b[0m\x1b[1mUnable to open /usr/lib/rpm/rpmrc for reading: No such file or directory.
> \x1b[0m\x1b[31;1merror: \x1b[0m\x1b[1mno dbpath has been set
> \x1b[0m\x1b[31;1merror: \x1b[0m\x1b[1mcannot open Packages database in 
> \x1b[0mlibrpm returned 0 installed packages
> libguestfs: trace: internal_list_rpm_applications = <struct guestfs_application2_list(0)>
> libguestfs: trace: inspect_list_applications2 = <struct guestfs_application2_list(0)>
> 
> The file "/usr/lib/rpm/rpmrc" absolutely exists in the guest (I booted it up separately, and checked it).
> 
> It seems that "internal_list_rpm_applications" [daemon/rpm.ml] calls chroot, and uses a child project -- can that be related to the issue?
> 
> Anyway, I think I'll post v2, just saying that I could not actually test it.

BTW my libguestfs has been last built at commit d829f9ff9ae0
("daemon/listfs: don't call "sgdisk -i" on bogus MBR partition table
entry", 2021-11-26).

Thanks
Laszlo