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qemu: query nbdkit module dir from binary

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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>
This commit is contained in:
Jonathon Jongsma 2022-12-09 10:29:25 -06:00
parent 1475c8c0d7
commit 4a632de2ac
1 changed files with 61 additions and 18 deletions
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79
src/qemu/qemu_nbdkit.c
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@ -20,7 +20,6 @@
#include <config.h>
#include <glib.h>
#include "configmake.h"
#include "vircommand.h"
#include "virerror.h"
#include "virlog.h"
@ -39,10 +38,6 @@
VIR_LOG_INIT("qemu.nbdkit");
#define NBDKIT_MODDIR LIBDIR "/nbdkit"
#define NBDKIT_PLUGINDIR NBDKIT_MODDIR "/plugins"
#define NBDKIT_FILTERDIR NBDKIT_MODDIR "/filters"
VIR_ENUM_IMPL(qemuNbdkitCaps,
QEMU_NBDKIT_CAPS_LAST,
/* 0 */
@ -56,6 +51,9 @@ struct _qemuNbdkitCaps {
char *path;
char *version;
char *filterDir;
char *pluginDir;
time_t ctime;
time_t libvirtCtime;
time_t pluginDirMtime;
@ -129,18 +127,47 @@ qemuNbdkitCapsQueryFilters(qemuNbdkitCaps *nbdkit)
static int
qemuNbdkitCapsQueryVersion(qemuNbdkitCaps *nbdkit)
qemuNbdkitCapsQueryBuildConfig(qemuNbdkitCaps *nbdkit)
{
size_t i;
g_autofree char *output = NULL;
g_auto(GStrv) lines = NULL;
const char *line;
g_autoptr(virCommand) cmd = virCommandNewArgList(nbdkit->path,
"--version",
"--dump-config",
NULL);
virCommandSetOutputBuffer(cmd, &nbdkit->version);
virCommandSetOutputBuffer(cmd, &output);
if (virCommandRun(cmd, NULL) != 0)
return -1;
VIR_DEBUG("Got nbdkit version %s", nbdkit->version);
lines = g_strsplit(output, "\n", 0);
if (!lines)
return -1;
for (i = 0; (line = lines[i]); i++) {
const char *key;
const char *val;
char *p;
p = strchr(line, '=');
if (!p)
continue;
*p = '\0';
key = line;
val = p + 1;
VIR_DEBUG("Got nbdkit config value %s=%s", key, val);
if (STREQ(key, "version"))
nbdkit->version = g_strdup(val);
else if (STREQ(key, "filterdir"))
nbdkit->filterDir = g_strdup(val);
else if (STREQ(key, "plugindir"))
nbdkit->pluginDir = g_strdup(val);
}
return 0;
}
@ -152,6 +179,8 @@ qemuNbdkitCapsFinalize(GObject *object)
g_clear_pointer(&nbdkit->path, g_free);
g_clear_pointer(&nbdkit->version, g_free);
g_clear_pointer(&nbdkit->filterDir, g_free);
g_clear_pointer(&nbdkit->pluginDir, g_free);
g_clear_pointer(&nbdkit->flags, virBitmapFree);
G_OBJECT_CLASS(qemu_nbdkit_caps_parent_class)->finalize(object);
@ -214,15 +243,15 @@ qemuNbdkitCapsQuery(qemuNbdkitCaps *caps)
return;
}
caps->ctime = st.st_ctime;
caps->filterDirMtime = qemuNbdkitGetDirMtime(NBDKIT_FILTERDIR);
caps->pluginDirMtime = qemuNbdkitGetDirMtime(NBDKIT_PLUGINDIR);
caps->libvirtCtime = virGetSelfLastChanged();
caps->libvirtVersion = LIBVIR_VERSION_NUMBER;
qemuNbdkitCapsQueryBuildConfig(caps);
qemuNbdkitCapsQueryPlugins(caps);
qemuNbdkitCapsQueryFilters(caps);
qemuNbdkitCapsQueryVersion(caps);
caps->ctime = st.st_ctime;
caps->filterDirMtime = qemuNbdkitGetDirMtime(caps->filterDir);
caps->pluginDirMtime = qemuNbdkitGetDirMtime(caps->pluginDir);
caps->libvirtCtime = virGetSelfLastChanged();
caps->libvirtVersion = LIBVIR_VERSION_NUMBER;
}
@ -267,9 +296,9 @@ virNbdkitCapsIsValid(void *data,
if (!nbdkitCaps->path)
return true;
if (!virNbkditCapsCheckModdir(NBDKIT_PLUGINDIR, nbdkitCaps->pluginDirMtime))
if (!virNbkditCapsCheckModdir(nbdkitCaps->pluginDir, nbdkitCaps->pluginDirMtime))
return false;
if (!virNbkditCapsCheckModdir(NBDKIT_FILTERDIR, nbdkitCaps->filterDirMtime))
if (!virNbkditCapsCheckModdir(nbdkitCaps->filterDir, nbdkitCaps->filterDirMtime))
return false;
if (nbdkitCaps->libvirtCtime != virGetSelfLastChanged() ||
@ -421,12 +450,22 @@ qemuNbdkitCapsLoadCache(qemuNbdkitCaps *nbdkitCaps,
}
nbdkitCaps->ctime = (time_t)l;
if ((nbdkitCaps->pluginDir = virXPathString("string(./plugindir)", ctxt)) == NULL) {
VIR_DEBUG("missing plugindir in nbdkit capabilities cache");
return -1;
}
if (virXPathLongLong("string(./plugindirmtime)", ctxt, &l) < 0) {
VIR_DEBUG("missing plugindirmtime in nbdkit capabilities XML");
return -1;
}
nbdkitCaps->pluginDirMtime = (time_t)l;
if ((nbdkitCaps->filterDir = virXPathString("string(./filterdir)", ctxt)) == NULL) {
VIR_DEBUG("missing filterdir in nbdkit capabilities cache");
return -1;
}
if (virXPathLongLong("string(./filterdirmtime)", ctxt, &l) < 0) {
VIR_DEBUG("missing filterdirmtime in nbdkit capabilities XML");
return -1;
@ -482,8 +521,12 @@ qemuNbdkitCapsFormatCache(qemuNbdkitCaps *nbdkitCaps)
nbdkitCaps->path);
virBufferAsprintf(&buf, "<nbdkitctime>%lu</nbdkitctime>\n",
nbdkitCaps->ctime);
virBufferEscapeString(&buf, "<plugindir>%s</plugindir>\n",
nbdkitCaps->pluginDir);
virBufferAsprintf(&buf, "<plugindirmtime>%lu</plugindirmtime>\n",
nbdkitCaps->pluginDirMtime);
virBufferEscapeString(&buf, "<filterdir>%s</filterdir>\n",
nbdkitCaps->filterDir);
virBufferAsprintf(&buf, "<filterdirmtime>%lu</filterdirmtime>\n",
nbdkitCaps->filterDirMtime);
virBufferAsprintf(&buf, "<selfctime>%lu</selfctime>\n",