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From 89ab50eb404664ac3522294f2f46a1c904a28abd Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Mon, 1 Jun 2020 17:35:58 +0100
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Subject: [PATCH] v2v: nbdkit: Don't use password=- parameter (RHBZ#1842440).
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This was broken with all nbdkit plugins, some in more ways than others.
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Because we start nbdkit in the background and wait 30 seconds for it
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to start running, the user had only 30 seconds to type in a password
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before we timed out the process. In addition with the VDDK plugin
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password=- had been broken ever since we changed the plugin to use a
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reexec
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(https://www.redhat.com/archives/libguestfs/2020-June/msg00012.html).
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The solution is to read the password ourselves and pass it to nbdkit
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as a private file.
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(cherry picked from commit 16b551c77c88219a2f68e2fc37daf2dc4d88e4ed)
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---
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v2v/nbdkit_sources.ml | 21 ++++++++++++++++++++-
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1 file changed, 20 insertions(+), 1 deletion(-)
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diff --git a/v2v/nbdkit_sources.ml b/v2v/nbdkit_sources.ml
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index 47832011..f5e91911 100644
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--- a/v2v/nbdkit_sources.ml
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+++ b/v2v/nbdkit_sources.ml
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@@ -142,7 +142,26 @@ let common_create ?bandwidth ?extra_debug ?extra_env password
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match password with
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| NoPassword -> cmd
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| AskForPassword ->
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- Nbdkit.add_arg cmd "password" "-"
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+ (* Because we will start nbdkit in the background and then wait
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+ * for 30 seconds for it to start up, we cannot use the
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+ * password=- feature of nbdkit to read the password
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+ * interactively (since in the words of the movie the user has
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+ * only "30 seconds to comply"). In any case this feature broke
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+ * in the VDDK plugin in nbdkit 1.18 and 1.20. So in the
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+ * AskForPassword case we read the password here.
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+ *)
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+ printf "password: ";
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+ let open Unix in
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+ let orig = tcgetattr stdin in
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+ let tios = { orig with c_echo = false } in
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+ tcsetattr stdin TCSAFLUSH tios; (* Disable echo. *)
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+ let password = read_line () in
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+ tcsetattr stdin TCSAFLUSH orig; (* Restore echo. *)
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+ printf "\n";
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+ let password_file = Filename.temp_file "v2vnbdkit" ".txt" in
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+ unlink_on_exit password_file;
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+ with_open_out password_file (fun chan -> output_string chan password);
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+ Nbdkit.add_arg cmd "password" ("+" ^ password_file)
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| PasswordFile password_file ->
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Nbdkit.add_arg cmd "password" ("+" ^ password_file) in
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