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96 lines
4.1 KiB
96 lines
4.1 KiB
From 87e5404d20ec54d16d22a7bb8f06ea91076c91f7 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Wed, 25 May 2022 16:47:04 +0100
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Subject: [PATCH] convert: If listing RPM applications fails, rebuild DB and
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retry
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In libguestfs before commit 488245ed6c ("daemon: rpm: Check return
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values from librpm calls") we didn't bother to check the return values
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from any librpm calls. In some cases where the RPM database is
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faulty, this caused us to return a zero-length array of applications
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(but no error indication). Libguestfs has subsequently been fixed so
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now it returns an error if the RPM database is corrupt.
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This commit changes virt-v2v behaviour so that if either
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guestfs_inspect_list_applications2 returns a zero-length list (ie. old
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libguestfs) or it throws an error (new libguestfs) then we attempt to
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rebuild the RPM database and retry the operation. Rebuilding the
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database can recover from some but not all RPM DB corruption.
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See-also: https://bugzilla.redhat.com/show_bug.cgi?id=2089623#c12
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2089623
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Reported-by: Xiaodai Wang
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Reported-by: Ming Xie
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Reviewed-by: Laszlo Ersek <lersek@redhat.com>
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(cherry picked from commit 31bf5db25bcfd8a9f5a48cc0523abae28861de9a)
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---
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v2v/inspect_source.ml | 34 ++++++++++++++++++++++++++++++++--
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1 file changed, 32 insertions(+), 2 deletions(-)
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diff --git a/v2v/inspect_source.ml b/v2v/inspect_source.ml
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index b8a3c8ad..554fde1d 100644
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--- a/v2v/inspect_source.ml
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+++ b/v2v/inspect_source.ml
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@@ -34,6 +34,7 @@ let rec inspect_source root_choice g =
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reject_if_not_installed_image g root;
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let typ = g#inspect_get_type root in
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+ let package_format = g#inspect_get_package_format root in
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(* Mount up the filesystems. *)
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let mps = g#inspect_get_mountpoints root in
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@@ -71,7 +72,7 @@ let rec inspect_source root_choice g =
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) mps;
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(* Get list of applications/packages installed. *)
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- let apps = g#inspect_list_applications2 root in
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+ let apps = list_applications g root package_format in
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let apps = Array.to_list apps in
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(* A map of app2_name -> application2, for easier lookups. Note
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@@ -106,7 +107,7 @@ let rec inspect_source root_choice g =
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i_arch = g#inspect_get_arch root;
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i_major_version = g#inspect_get_major_version root;
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i_minor_version = g#inspect_get_minor_version root;
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- i_package_format = g#inspect_get_package_format root;
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+ i_package_format = package_format;
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i_package_management = g#inspect_get_package_management root;
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i_product_name = g#inspect_get_product_name root;
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i_product_variant = g#inspect_get_product_variant root;
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@@ -186,6 +187,35 @@ and reject_if_not_installed_image g root =
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if fmt <> "installed" then
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error (f_"libguestfs thinks this is not an installed operating system (it might be, for example, an installer disk or live CD). If this is wrong, it is probably a bug in libguestfs. root=%s fmt=%s") root fmt
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+(* Wrapper around g#inspect_list_applications2 which, for RPM
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+ * guests, on failure tries to rebuild the RPM database before
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+ * repeating the operation.
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+ *)
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+and list_applications g root = function
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+ | "rpm" ->
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+ (* RPM guest.
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+ *
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+ * In libguestfs before commit 488245ed6c ("daemon: rpm: Check
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+ * return values from librpm calls"), a corrupt RPM database
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+ * would return an empty array here with no exception. Hence
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+ * the check below which turns empty array => exception. In
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+ * libguestfs after that commit, inspect_list_applications2
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+ * will raise an exception if it detects a corrupt RPM database.
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+ *)
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+ (try
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+ let apps = g#inspect_list_applications2 root in
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+ if apps = [||] then raise (G.Error "no applications returned");
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+ apps
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+ with G.Error msg ->
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+ debug "%s" msg;
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+ debug "rebuilding RPM database and retrying ...";
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+ ignore (g#sh "rpmdb --rebuilddb");
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+ g#inspect_list_applications2 root
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+ )
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+ | _ ->
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+ (* Non-RPM guest, just do it. *)
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+ g#inspect_list_applications2 root
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+
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(* See if this guest could use UEFI to boot. It should use GPT and
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* it should have an EFI System Partition (ESP).
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*
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