From patchwork Tue Jan 7 14:52:06 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michal Privoznik X-Patchwork-Id: 13929114 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9785AC3DA4A for ; Tue, 7 Jan 2025 14:53:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tVAwY-0003Gz-TS; Tue, 07 Jan 2025 09:52:30 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tVAwU-0003FX-56 for qemu-devel@nongnu.org; Tue, 07 Jan 2025 09:52:27 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tVAwP-0007jl-WC for qemu-devel@nongnu.org; Tue, 07 Jan 2025 09:52:25 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1736261540; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=v7fSVaL4A+NJUb5Qfu7/DO8n7m7CrRilZSxiNE2PvZg=; b=BTgicFREg16BzDMoP6TaXhVyA4LvQwIJTj5dReMWIhuWse29WZW1WfVchwr7FgYnz/yuvh 6FyC9T+pi9J+ws/G6g2hiV3MyelOA8o9eLsJv9se2GLFxb+KpIJYBtrb7V7AfxQwWmNDbn w1JDgMOzGM4jbVnBi0LZJ0vORVh2KmU= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-617-hUNVRimPPoyZSnLzrYbekg-1; Tue, 07 Jan 2025 09:52:18 -0500 X-MC-Unique: hUNVRimPPoyZSnLzrYbekg-1 X-Mimecast-MFC-AGG-ID: hUNVRimPPoyZSnLzrYbekg Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 12E08195609E; Tue, 7 Jan 2025 14:52:17 +0000 (UTC) Received: from moe.brq.redhat.com (unknown [10.43.3.236]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 981173000197; Tue, 7 Jan 2025 14:52:15 +0000 (UTC) From: Michal Privoznik To: qemu-devel@nongnu.org Cc: kkostiuk@redhat.com, michael.roth@amd.com, jtomko@redhat.com Subject: [PATCH v3 1/2] qga: Invert logic on return value in main() Date: Tue, 7 Jan 2025 15:52:06 +0100 Message-ID: <8a28265f50177a8dc4c10fcf4146e85a7fd748ee.1736261360.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.437, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Current logic on return value ('ret' variable) in main() is error prone. The variable is initialized to EXIT_SUCCESS and then set to EXIT_FAILURE on error paths. This makes it very easy to forget to set the variable to indicate error when adding new error path, as is demonstrated by handling of initialize_agent() failure. It's simply lacking setting of the variable. There's just one case where success should be indicated: when dumping the config ('-D' cmd line argument). To resolve this, initialize the variable to failure value and set it explicitly to success value in that one specific case. Signed-off-by: Michal Privoznik Reviewed-by: Ján Tomko --- qga/main.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/qga/main.c b/qga/main.c index 4a695235f0..68ea7f275a 100644 --- a/qga/main.c +++ b/qga/main.c @@ -1579,7 +1579,7 @@ static void stop_agent(GAState *s, bool requested) int main(int argc, char **argv) { - int ret = EXIT_SUCCESS; + int ret = EXIT_FAILURE; GAState *s; GAConfig *config = g_new0(GAConfig, 1); int socket_activation; @@ -1607,7 +1607,6 @@ int main(int argc, char **argv) socket_activation = check_socket_activation(); if (socket_activation > 1) { g_critical("qemu-ga only supports listening on one socket"); - ret = EXIT_FAILURE; goto end; } if (socket_activation) { @@ -1631,7 +1630,6 @@ int main(int argc, char **argv) if (!config->method) { g_critical("unsupported listen fd type"); - ret = EXIT_FAILURE; goto end; } } else if (config->channel_path == NULL) { @@ -1643,13 +1641,13 @@ int main(int argc, char **argv) config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT); } else { g_critical("must specify a path for this channel"); - ret = EXIT_FAILURE; goto end; } } if (config->dumpconf) { config_dump(config); + ret = EXIT_SUCCESS; goto end; } @@ -1664,6 +1662,7 @@ int main(int argc, char **argv) SERVICE_TABLE_ENTRY service_table[] = { { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } }; StartServiceCtrlDispatcher(service_table); + ret = EXIT_SUCCESS; } else { ret = run_agent(s); } From patchwork Tue Jan 7 14:52:07 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michal Privoznik X-Patchwork-Id: 13929113 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 957BFE7719A for ; Tue, 7 Jan 2025 14:53:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tVAwZ-0003Hd-QP; 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Tue, 07 Jan 2025 09:52:19 -0500 X-MC-Unique: YcogWWYFPzGUsxVqSKB9OQ-1 X-Mimecast-MFC-AGG-ID: YcogWWYFPzGUsxVqSKB9OQ Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 007A8195609E; Tue, 7 Jan 2025 14:52:19 +0000 (UTC) Received: from moe.brq.redhat.com (unknown [10.43.3.236]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7C1C33000197; Tue, 7 Jan 2025 14:52:17 +0000 (UTC) From: Michal Privoznik To: qemu-devel@nongnu.org Cc: kkostiuk@redhat.com, michael.roth@amd.com, jtomko@redhat.com Subject: [PATCH v3 2/2] qga: Don't daemonize before channel is initialized Date: Tue, 7 Jan 2025 15:52:07 +0100 Message-ID: <7a42b0cbda5c7e01cf76bc1b29a1210cd018fa78.1736261360.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.437, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org If the agent is set to daemonize but for whatever reason fails to init the channel, the error message is lost. Worse, the agent daemonizes needlessly and returns success. For instance: # qemu-ga -m virtio-serial \ -p /dev/nonexistent_device \ -f /run/qemu-ga.pid \ -t /run \ -d # echo $? 0 This makes it needlessly hard for init scripts to detect a failure in qemu-ga startup. Though, they shouldn't pass '-d' in the first place. Let's open the channel first and only after that become a daemon. Related bug: https://bugs.gentoo.org/810628 Signed-off-by: Michal Privoznik Reviewed-by: Ján Tomko --- qga/main.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/qga/main.c b/qga/main.c index 68ea7f275a..35f061b5ea 100644 --- a/qga/main.c +++ b/qga/main.c @@ -1430,7 +1430,6 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation) if (config->daemonize) { /* delay opening/locking of pidfile till filesystems are unfrozen */ s->deferred_options.pid_filepath = config->pid_filepath; - become_daemon(NULL); } if (config->log_filepath) { /* delay opening the log file till filesystems are unfrozen */ @@ -1438,9 +1437,6 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation) } ga_disable_logging(s); } else { - if (config->daemonize) { - become_daemon(config->pid_filepath); - } if (config->log_filepath) { FILE *log_file = ga_open_logfile(config->log_filepath); if (!log_file) { @@ -1487,6 +1483,20 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation) ga_apply_command_filters(s); + if (!channel_init(s, s->config->method, s->config->channel_path, + s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) { + g_critical("failed to initialize guest agent channel"); + return NULL; + } + + if (config->daemonize) { + if (ga_is_frozen(s)) { + become_daemon(NULL); + } else { + become_daemon(config->pid_filepath); + } + } + ga_state = s; return s; } @@ -1513,8 +1523,9 @@ static void cleanup_agent(GAState *s) static int run_agent_once(GAState *s) { - if (!channel_init(s, s->config->method, s->config->channel_path, - s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) { + if (!s->channel && + channel_init(s, s->config->method, s->config->channel_path, + s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) { g_critical("failed to initialize guest agent channel"); return EXIT_FAILURE; } @@ -1523,6 +1534,7 @@ static int run_agent_once(GAState *s) if (s->channel) { ga_channel_free(s->channel); + s->channel = NULL; } return EXIT_SUCCESS;