[PATCH 3/4] qemu: Move channelTargetDir into stateDir

For historical reasons (i.e. unknown reason) we put channel sockets into a path derived from cfg->libDir which is a path that survives host reboots (e.g. /var/lib/libvirt/...). This is not necessary and in fact for session daemon creates a longer prefix: XDG_CONFIG_HOME -> /home/user/.config XDG_RUNTIME_DIR -> /run/user/1000 Worse, if host is rebooted suddenly (e.g. due to power loss) then we leave files behind and nobody will ever remove them. Therefore, place the channel target dir into state dir. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2173980 Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- libvirt.spec.in | 1 - src/qemu/qemu_conf.c | 9 ++-- src/qemu/qemu_domain.c | 52 +++++++++++++++++-- .../channel-unix-source-path.xml | 4 ++ .../channel-unix-source-path-active.xml | 5 ++ .../channel-unix-source-path-inactive.xml | 4 ++ 6 files changed, 63 insertions(+), 12 deletions(-) diff --git a/libvirt.spec.in b/libvirt.spec.in index 8aee709e42..1f283cec6d 100644 --- a/libvirt.spec.in +++ b/libvirt.spec.in @@ -2124,7 +2124,6 @@ exit 0 %ghost %dir %{_rundir}/libvirt/qemu/slirp/ %ghost %dir %{_rundir}/libvirt/qemu/swtpm/ %dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/ -%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/channel/ %dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/checkpoint/ %dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/dump/ %dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/nvram/ diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index 532fe36be3..3f811d064f 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -143,6 +143,7 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged, cfg->configBaseDir = g_strdup_printf("%s/etc", root); cfg->stateDir = g_strdup_printf("%s/run/qemu", root); cfg->swtpmStateDir = g_strdup_printf("%s/run/swtpm", root); + cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->stateDir); cfg->cacheDir = g_strdup_printf("%s/cache/qemu", root); cfg->libDir = g_strdup_printf("%s/lib/qemu", root); cfg->swtpmStorageDir = g_strdup_printf("%s/lib/swtpm", root); @@ -151,7 +152,6 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged, cfg->snapshotDir = g_strdup_printf("%s/snapshot", cfg->libDir); cfg->checkpointDir = g_strdup_printf("%s/checkpoint", cfg->libDir); cfg->autoDumpPath = g_strdup_printf("%s/dump", cfg->libDir); - cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->libDir); cfg->nvramDir = g_strdup_printf("%s/nvram", cfg->libDir); cfg->memoryBackingDir = g_strdup_printf("%s/ram", cfg->libDir); } else if (privileged) { @@ -163,8 +163,8 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged, cfg->configBaseDir = g_strdup(SYSCONFDIR "/libvirt"); cfg->stateDir = g_strdup_printf("%s/libvirt/qemu", RUNSTATEDIR); - cfg->swtpmStateDir = g_strdup_printf("%s/libvirt/qemu/swtpm", RUNSTATEDIR); + cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->stateDir); cfg->cacheDir = g_strdup_printf("%s/cache/libvirt/qemu", LOCALSTATEDIR); @@ -173,7 +173,6 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged, cfg->snapshotDir = g_strdup_printf("%s/snapshot", cfg->libDir); cfg->checkpointDir = g_strdup_printf("%s/checkpoint", cfg->libDir); cfg->autoDumpPath = g_strdup_printf("%s/dump", cfg->libDir); - cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->libDir); cfg->nvramDir = g_strdup_printf("%s/nvram", cfg->libDir); cfg->memoryBackingDir = g_strdup_printf("%s/ram", cfg->libDir); cfg->swtpmStorageDir = g_strdup_printf("%s/lib/libvirt/swtpm", @@ -190,8 +189,8 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged, rundir = virGetUserRuntimeDirectory(); cfg->stateDir = g_strdup_printf("%s/qemu/run", rundir); - cfg->swtpmStateDir = g_strdup_printf("%s/swtpm", cfg->stateDir); + cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->stateDir); cfg->configBaseDir = virGetUserConfigDirectory(); @@ -201,8 +200,6 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged, cfg->checkpointDir = g_strdup_printf("%s/qemu/checkpoint", cfg->configBaseDir); cfg->autoDumpPath = g_strdup_printf("%s/qemu/dump", cfg->configBaseDir); - cfg->channelTargetDir = g_strdup_printf("%s/qemu/channel", - cfg->configBaseDir); cfg->nvramDir = g_strdup_printf("%s/qemu/nvram", cfg->configBaseDir); cfg->memoryBackingDir = g_strdup_printf("%s/qemu/ram", cfg->configBaseDir); cfg->swtpmStorageDir = g_strdup_printf("%s/qemu/swtpm", diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index b4844351ba..3b73b7554e 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -5343,6 +5343,28 @@ qemuDomainDefaultNetModel(const virDomainDef *def, } + +static bool +qemuDomainChrMatchDefaultPath(const char *prefix, + const char *infix, + const char *target, + const char *path) +{ + g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER; + g_autofree char *regexp = NULL; + + virBufferEscapeRegex(&buf, "^%s", prefix); + if (infix) + virBufferEscapeRegex(&buf, "%s", infix); + virBufferAddLit(&buf, "/(target/)?([^/]+\\.)|(domain-[^/]+/)|([0-9]+-[^/]+/)"); + virBufferEscapeRegex(&buf, "%s$", target); + + regexp = virBufferContentAndReset(&buf); + + return virStringMatch(path, regexp); +} + + /* * Clear auto generated unix socket paths: * @@ -5363,6 +5385,9 @@ qemuDomainDefaultNetModel(const virDomainDef *def, * * This function clears the path for migration as well, so we need to clear * the path even if we are not storing it in the XML. + * + * Please note, as of libvirt 9.6.0 the channelTargetDir is no longer derived + * from cfg->libDir but rather cfg->stateDir. */ static void qemuDomainChrDefDropDefaultPath(virDomainChrDef *chr, @@ -5381,14 +5406,31 @@ qemuDomainChrDefDropDefaultPath(virDomainChrDef *chr, cfg = virQEMUDriverGetConfig(driver); - virBufferEscapeRegex(&buf, "^%s", cfg->channelTargetDir); - virBufferAddLit(&buf, "/(target/)?([^/]+\\.)|(domain-[^/]+/)|([0-9]+-[^/]+/)"); - virBufferEscapeRegex(&buf, "%s$", chr->target.name); + if (qemuDomainChrMatchDefaultPath(cfg->channelTargetDir, + NULL, + chr->target.name, + chr->source->data.nix.path)) { + VIR_FREE(chr->source->data.nix.path); + return; + } - regexp = virBufferContentAndReset(&buf); + /* Previously, channelTargetDir was derived from cfg->libdir, or + * cfg->configBaseDir even. Try them too. */ + if (qemuDomainChrMatchDefaultPath(cfg->libDir, + "/channel", + chr->target.name, + chr->source->data.nix.path)) { + VIR_FREE(chr->source->data.nix.path); + return; + } - if (virStringMatch(chr->source->data.nix.path, regexp)) + if (qemuDomainChrMatchDefaultPath(cfg->configBaseDir, + "/qemu/channel", + chr->target.name, + chr->source->data.nix.path)) { VIR_FREE(chr->source->data.nix.path); + return; + } } diff --git a/tests/qemuxml2argvdata/channel-unix-source-path.xml b/tests/qemuxml2argvdata/channel-unix-source-path.xml index db0e99c3d1..df548d88e7 100644 --- a/tests/qemuxml2argvdata/channel-unix-source-path.xml +++ b/tests/qemuxml2argvdata/channel-unix-source-path.xml @@ -28,6 +28,10 @@ <source mode='bind' path='/var/lib/libvirt/qemu/channel/1-QEMUGuest1/org.qemu.guest_agent.4'/> <target type='virtio' name='org.qemu.guest_agent.4'/> </channel> + <channel type='unix'> + <source mode='bind' path='/var/run/libvirt/qemu/channel/1-QEMUGuest1/org.qemu.guest_agent.5'/> + <target type='virtio' name='org.qemu.guest_agent.5'/> + </channel> <memballoon model='none'/> </devices> </domain> diff --git a/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml b/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml index 68835ceb15..ec927d37c6 100644 --- a/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml +++ b/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml @@ -46,6 +46,11 @@ <target type='virtio' name='org.qemu.guest_agent.4'/> <address type='virtio-serial' controller='0' bus='0' port='5'/> </channel> + <channel type='unix'> + <source mode='bind' path='/var/run/libvirt/qemu/channel/1-QEMUGuest1/org.qemu.guest_agent.5'/> + <target type='virtio' name='org.qemu.guest_agent.5'/> + <address type='virtio-serial' controller='0' bus='0' port='6'/> + </channel> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <audio id='1' type='none'/> diff --git a/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml b/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml index 738c1184c0..c979bedb39 100644 --- a/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml +++ b/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml @@ -42,6 +42,10 @@ <target type='virtio' name='org.qemu.guest_agent.4'/> <address type='virtio-serial' controller='0' bus='0' port='5'/> </channel> + <channel type='unix'> + <target type='virtio' name='org.qemu.guest_agent.5'/> + <address type='virtio-serial' controller='0' bus='0' port='6'/> + </channel> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <audio id='1' type='none'/> -- 2.41.0