From e1b339688e5f8f2a14fe0c7e9d02ad68004e4655 Mon Sep 17 00:00:00 2001

From: "Richard W.M. Jones" <rjones@redhat.com>

Date: Thu, 15 Apr 2021 09:18:22 +0100

Subject: [PATCH] inspection: More reliable detection of Linux split /usr

 configurations

In RHEL 8+, /usr/etc no longer exists.  Since we were looking for this

directory in order to detect a separate /usr partition, those were no

longer detected, so the merging of /usr data into the root was not

being done.  The result was incomplete inspection data and failure of

virt-v2v.

All Linux systems since forever have had /usr/src but not /src, so

detect this instead.

Furthermore the merging code didn't work, because we expected that the

root filesystem had a distro assigned, but in this configuration we

may need to look for that information in /usr/lib/os-release (not on

the root filesystem).  This change makes the merging work even if we

have incomplete information about the root filesystem, so long as we

have an /etc/fstab entry pointing to the /usr mountpoint.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1949683

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1930133

Fixes: commit 394d11be49121884295e61964ed47f5a8488c252

(cherry picked from commit 26427b9ecc64e7e5e53a1d577cef9dc080d08877)

---

 daemon/inspect.ml    | 33 +++++++++++++++------------------

 daemon/inspect_fs.ml |  6 +++---

 2 files changed, 18 insertions(+), 21 deletions(-)

diff --git a/daemon/inspect.ml b/daemon/inspect.ml

index 945a476f6..fb75b4a6c 100644

--- a/daemon/inspect.ml

+++ b/daemon/inspect.ml

@@ -182,11 +182,9 @@ and check_for_duplicated_bsd_root fses =

 and collect_linux_inspection_info fses =

   List.map (

     function

-    | { role = RoleRoot { distro = Some d } } as root ->

-       if d <> DISTRO_COREOS then

-         collect_linux_inspection_info_for fses root

-       else

-         root

+    | { role = RoleRoot { distro = Some DISTRO_COREOS } } as root -> root

+    | { role = RoleRoot _ } as root ->

+       collect_linux_inspection_info_for fses root

     | fs -> fs

   ) fses

@@ -196,29 +194,28 @@ and collect_linux_inspection_info fses =

  * or other ways to identify the OS).

  *)

 and collect_linux_inspection_info_for fses root =

-  let root_distro, root_fstab =

+  let root_fstab =

     match root with

-    | { role = RoleRoot { distro = Some d; fstab = f } } -> d, f

+    | { role = RoleRoot { fstab = f } } -> f

     | _ -> assert false in

   try

     let usr =

       List.find (

         function

-        | { role = RoleUsr { distro = d } }

-             when d = Some root_distro || d = None -> true

+        | { role = RoleUsr _; fs_location = usr_mp } ->

+           (* This checks that this usr is found in the fstab of

+            * the root filesystem.

+            *)

+           List.exists (

+             fun (mountable, _) ->

+               usr_mp.mountable = mountable

+           ) root_fstab

         | _ -> false

       ) fses in

-    let usr_mountable = usr.fs_location.mountable in

-

-    (* This checks that [usr] is found in the fstab of the root

-     * filesystem.  If not, [Not_found] is thrown.

-     *)

-    ignore (

-      List.find (fun (mountable, _) -> usr_mountable = mountable) root_fstab

-    );

-

+    eprintf "collect_linux_inspection_info_for: merging:\n%sinto:\n%s"

+      (string_of_fs usr) (string_of_fs root);

     merge usr root;

     root

   with

diff --git a/daemon/inspect_fs.ml b/daemon/inspect_fs.ml

index 6e00c7083..02b5a0470 100644

--- a/daemon/inspect_fs.ml

+++ b/daemon/inspect_fs.ml

@@ -164,10 +164,10 @@ and check_filesystem mountable =

     ()

   )

   (* Linux /usr? *)

-  else if Is.is_dir "/etc" &&

-          Is.is_dir "/bin" &&

-          Is.is_dir "/share" &&

+  else if Is.is_dir "/bin" &&

           Is.is_dir "/local" &&

+          Is.is_dir "/share" &&

+          Is.is_dir "/src" &&

           not (Is.is_file "/etc/fstab") then (

     debug_matching "Linux /usr";

     role := `Usr;

-- 

2.18.4