97 lines
3.6 KiB
Diff
97 lines
3.6 KiB
Diff
From 522a927257cfa55ac87775165be23779e00076bb Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Thu, 29 Jun 2023 14:34:42 +0200
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Subject: [PATCH] lib/utils: make "chown_for_libvirt_rhbz_1045069" fail hard
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Currently "chown_for_libvirt_rhbz_1045069" is best effort; if it fails, we
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suppress the exception (we log it in verbose mode only, even).
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That's not proved helpful: it almost certainly leads to later errors, but
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those errors are less clear than the original (suppressed) exception.
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Namely, the user sees something like
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> Failed to connect to '/tmp/v2v.sKlulY/in0': Permission denied
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rather than
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> Failed to connect socket to '/var/run/libvirt/virtqemud-sock-ro':
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> Connection refused
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So just allow the exception to propagate outwards.
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And then, now that "chown_for_libvirt_rhbz_1045069" will be able to fail,
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hoist the call to "On_exit.rm_rf" before the call to
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"chown_for_libvirt_rhbz_1045069", after creating the v2v temporary
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directory. In the current order, if "chown_for_libvirt_rhbz_1045069" threw
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an exception, then we'd leak the temp dir in the filesystem.
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2182024
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Message-Id: <20230629123443.188350-3-lersek@redhat.com>
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[lersek@redhat.com: reinstate parens under "then" [Rich]]
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Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
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(cherry picked from commit 8bcf383510a3d9deaa9b4c069a45c1604c9d5f53)
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---
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lib/utils.ml | 23 +++++++++--------------
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lib/utils.mli | 5 +----
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2 files changed, 10 insertions(+), 18 deletions(-)
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diff --git a/lib/utils.ml b/lib/utils.ml
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index 54431307..7b3aa2e2 100644
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--- a/lib/utils.ml
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+++ b/lib/utils.ml
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@@ -151,19 +151,14 @@ let backend_is_libvirt () =
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let rec chown_for_libvirt_rhbz_1045069 file =
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let running_as_root = Unix.geteuid () = 0 in
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if running_as_root && backend_is_libvirt () then (
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- try
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- let user = Option.value ~default:"qemu" (libvirt_qemu_user ()) in
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- let uid =
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- if String.is_prefix user "+" then
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- int_of_string (String.sub user 1 (String.length user - 1))
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- else
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- (Unix.getpwnam user).pw_uid in
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- debug "setting owner of %s to %d:root" file uid;
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- Unix.chown file uid 0
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- with
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- | exn -> (* Print exception, but continue. *)
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- debug "could not set owner of %s: %s"
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- file (Printexc.to_string exn)
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+ let user = Option.value ~default:"qemu" (libvirt_qemu_user ()) in
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+ let uid =
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+ if String.is_prefix user "+" then
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+ int_of_string (String.sub user 1 (String.length user - 1))
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+ else
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+ (Unix.getpwnam user).pw_uid in
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+ debug "setting owner of %s to %d:root" file uid;
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+ Unix.chown file uid 0
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)
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(* Get the local user that libvirt uses to run qemu when we are
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@@ -206,8 +201,8 @@ let error_if_no_ssh_agent () =
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(* Create the directory containing inX and outX sockets. *)
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let create_v2v_directory () =
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let d = Mkdtemp.temp_dir "v2v." in
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- chown_for_libvirt_rhbz_1045069 d;
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On_exit.rm_rf d;
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+ chown_for_libvirt_rhbz_1045069 d;
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d
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(* Wait for a file to appear until a timeout. *)
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diff --git a/lib/utils.mli b/lib/utils.mli
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index cf88a467..391a2a35 100644
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--- a/lib/utils.mli
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+++ b/lib/utils.mli
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@@ -67,10 +67,7 @@ val chown_for_libvirt_rhbz_1045069 : string -> unit
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to root-owned files and directories. To fix this, provide
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a function to chown things we might need to qemu:root so
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qemu can access them. Note that root normally ignores
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- permissions so can still access the resource.
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-
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- This is best-effort. If something fails then we carry
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- on and hope for the best. *)
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+ permissions so can still access the resource. *)
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val error_if_no_ssh_agent : unit -> unit
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