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qemu: expand nbdkit capabilities

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In order to add caching of the nbdkit capabilities, we will need to
compare against file modification times, etc. So look up this
information when creating the nbdkit caps.

Add a nbdkit_moddir build option to allow the builder to specify the
location to look for nbdkit plugins and filters.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Jonathon Jongsma 2022-07-21 17:16:40 -05:00
parent 6b7e6b73a9
commit 03afd10cd3
1 changed files with 42 additions and 0 deletions
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42
src/qemu/qemu_nbdkit.c
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@ -20,6 +20,7 @@
#include <config.h>
#include <glib.h>
#include "configmake.h"
#include "vircommand.h"
#include "virerror.h"
#include "virlog.h"
@ -38,6 +39,10 @@
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 */
@ -51,6 +56,11 @@ struct _qemuNbdkitCaps {
char *path;
char *version;
time_t ctime;
time_t libvirtCtime;
time_t pluginDirMtime;
time_t filterDirMtime;
unsigned int libvirtVersion;
virBitmap *flags;
};
@ -175,9 +185,41 @@ qemuNbdkitCapsNew(const char *path)
}
static time_t
qemuNbdkitGetDirMtime(const char *moddir)
{
struct stat st;
if (stat(moddir, &st) < 0) {
VIR_DEBUG("Failed to stat nbdkit module directory '%s': %s",
moddir,
g_strerror(errno));
return 0;
}
return st.st_mtime;
}
G_GNUC_UNUSED static void
qemuNbdkitCapsQuery(qemuNbdkitCaps *caps)
{
struct stat st;
if (stat(caps->path, &st) < 0) {
VIR_DEBUG("Failed to stat nbdkit binary '%s': %s",
caps->path,
g_strerror(errno));
caps->ctime = 0;
return;
}
caps->ctime = st.st_ctime;
caps->filterDirMtime = qemuNbdkitGetDirMtime(NBDKIT_FILTERDIR);
caps->pluginDirMtime = qemuNbdkitGetDirMtime(NBDKIT_PLUGINDIR);
caps->libvirtCtime = virGetSelfLastChanged();
caps->libvirtVersion = LIBVIR_VERSION_NUMBER;
qemuNbdkitCapsQueryPlugins(caps);
qemuNbdkitCapsQueryFilters(caps);
qemuNbdkitCapsQueryVersion(caps);