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qemu: query nbdkit module dir from binary
Rather than hard-coding the nbdkit module directory, query the nbdkit binary for the location to these directories. nbdkit provides a --dump-config optiont that outputs this information and can be easily parsed. We can also get the version from this output rather than executing `nbdkit --version` separately. Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com>
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@ -20,7 +20,6 @@
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#include <config.h>
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#include <glib.h>
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#include "configmake.h"
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#include "vircommand.h"
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#include "virerror.h"
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#include "virlog.h"
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@ -39,10 +38,6 @@
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VIR_LOG_INIT("qemu.nbdkit");
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#define NBDKIT_MODDIR LIBDIR "/nbdkit"
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#define NBDKIT_PLUGINDIR NBDKIT_MODDIR "/plugins"
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#define NBDKIT_FILTERDIR NBDKIT_MODDIR "/filters"
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VIR_ENUM_IMPL(qemuNbdkitCaps,
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QEMU_NBDKIT_CAPS_LAST,
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/* 0 */
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@ -56,6 +51,9 @@ struct _qemuNbdkitCaps {
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char *path;
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char *version;
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char *filterDir;
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char *pluginDir;
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time_t ctime;
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time_t libvirtCtime;
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time_t pluginDirMtime;
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@ -129,18 +127,47 @@ qemuNbdkitCapsQueryFilters(qemuNbdkitCaps *nbdkit)
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static int
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qemuNbdkitCapsQueryVersion(qemuNbdkitCaps *nbdkit)
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qemuNbdkitCapsQueryBuildConfig(qemuNbdkitCaps *nbdkit)
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{
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size_t i;
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g_autofree char *output = NULL;
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g_auto(GStrv) lines = NULL;
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const char *line;
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g_autoptr(virCommand) cmd = virCommandNewArgList(nbdkit->path,
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"--version",
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"--dump-config",
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NULL);
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virCommandSetOutputBuffer(cmd, &nbdkit->version);
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virCommandSetOutputBuffer(cmd, &output);
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if (virCommandRun(cmd, NULL) != 0)
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return -1;
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VIR_DEBUG("Got nbdkit version %s", nbdkit->version);
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lines = g_strsplit(output, "\n", 0);
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if (!lines)
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return -1;
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for (i = 0; (line = lines[i]); i++) {
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const char *key;
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const char *val;
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char *p;
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p = strchr(line, '=');
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if (!p)
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continue;
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*p = '\0';
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key = line;
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val = p + 1;
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VIR_DEBUG("Got nbdkit config value %s=%s", key, val);
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if (STREQ(key, "version"))
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nbdkit->version = g_strdup(val);
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else if (STREQ(key, "filterdir"))
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nbdkit->filterDir = g_strdup(val);
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else if (STREQ(key, "plugindir"))
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nbdkit->pluginDir = g_strdup(val);
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}
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return 0;
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}
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@ -152,6 +179,8 @@ qemuNbdkitCapsFinalize(GObject *object)
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g_clear_pointer(&nbdkit->path, g_free);
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g_clear_pointer(&nbdkit->version, g_free);
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g_clear_pointer(&nbdkit->filterDir, g_free);
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g_clear_pointer(&nbdkit->pluginDir, g_free);
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g_clear_pointer(&nbdkit->flags, virBitmapFree);
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G_OBJECT_CLASS(qemu_nbdkit_caps_parent_class)->finalize(object);
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@ -214,15 +243,15 @@ qemuNbdkitCapsQuery(qemuNbdkitCaps *caps)
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return;
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}
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caps->ctime = st.st_ctime;
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caps->filterDirMtime = qemuNbdkitGetDirMtime(NBDKIT_FILTERDIR);
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caps->pluginDirMtime = qemuNbdkitGetDirMtime(NBDKIT_PLUGINDIR);
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caps->libvirtCtime = virGetSelfLastChanged();
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caps->libvirtVersion = LIBVIR_VERSION_NUMBER;
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qemuNbdkitCapsQueryBuildConfig(caps);
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qemuNbdkitCapsQueryPlugins(caps);
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qemuNbdkitCapsQueryFilters(caps);
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qemuNbdkitCapsQueryVersion(caps);
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caps->ctime = st.st_ctime;
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caps->filterDirMtime = qemuNbdkitGetDirMtime(caps->filterDir);
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caps->pluginDirMtime = qemuNbdkitGetDirMtime(caps->pluginDir);
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caps->libvirtCtime = virGetSelfLastChanged();
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caps->libvirtVersion = LIBVIR_VERSION_NUMBER;
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}
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@ -267,9 +296,9 @@ virNbdkitCapsIsValid(void *data,
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if (!nbdkitCaps->path)
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return true;
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if (!virNbkditCapsCheckModdir(NBDKIT_PLUGINDIR, nbdkitCaps->pluginDirMtime))
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if (!virNbkditCapsCheckModdir(nbdkitCaps->pluginDir, nbdkitCaps->pluginDirMtime))
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return false;
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if (!virNbkditCapsCheckModdir(NBDKIT_FILTERDIR, nbdkitCaps->filterDirMtime))
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if (!virNbkditCapsCheckModdir(nbdkitCaps->filterDir, nbdkitCaps->filterDirMtime))
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return false;
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if (nbdkitCaps->libvirtCtime != virGetSelfLastChanged() ||
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@ -421,12 +450,22 @@ qemuNbdkitCapsLoadCache(qemuNbdkitCaps *nbdkitCaps,
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}
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nbdkitCaps->ctime = (time_t)l;
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if ((nbdkitCaps->pluginDir = virXPathString("string(./plugindir)", ctxt)) == NULL) {
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VIR_DEBUG("missing plugindir in nbdkit capabilities cache");
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return -1;
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}
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if (virXPathLongLong("string(./plugindirmtime)", ctxt, &l) < 0) {
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VIR_DEBUG("missing plugindirmtime in nbdkit capabilities XML");
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return -1;
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}
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nbdkitCaps->pluginDirMtime = (time_t)l;
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if ((nbdkitCaps->filterDir = virXPathString("string(./filterdir)", ctxt)) == NULL) {
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VIR_DEBUG("missing filterdir in nbdkit capabilities cache");
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return -1;
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}
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if (virXPathLongLong("string(./filterdirmtime)", ctxt, &l) < 0) {
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VIR_DEBUG("missing filterdirmtime in nbdkit capabilities XML");
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return -1;
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@ -482,8 +521,12 @@ qemuNbdkitCapsFormatCache(qemuNbdkitCaps *nbdkitCaps)
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nbdkitCaps->path);
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virBufferAsprintf(&buf, "<nbdkitctime>%lu</nbdkitctime>\n",
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nbdkitCaps->ctime);
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virBufferEscapeString(&buf, "<plugindir>%s</plugindir>\n",
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nbdkitCaps->pluginDir);
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virBufferAsprintf(&buf, "<plugindirmtime>%lu</plugindirmtime>\n",
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nbdkitCaps->pluginDirMtime);
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virBufferEscapeString(&buf, "<filterdir>%s</filterdir>\n",
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nbdkitCaps->filterDir);
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virBufferAsprintf(&buf, "<filterdirmtime>%lu</filterdirmtime>\n",
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nbdkitCaps->filterDirMtime);
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virBufferAsprintf(&buf, "<selfctime>%lu</selfctime>\n",
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