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/*
* qemu_interop_config.c: QEMU firmware/vhost-user etc configs
*
* Copyright (C) 2019 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "qemu_interop_config.h"
#include "configmake.h"
#include "virerror.h"
#include "virfile.h"
#include "virhash.h"
#include "virlog.h"
#include "virutil.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
VIR_LOG_INIT("qemu.qemu_configs");
static int
qemuBuildFileList(GHashTable *files, const char *dir)
{
g_autoptr(DIR) dirp = NULL;
struct dirent *ent = NULL;
int rc;
if ((rc = virDirOpenIfExists(&dirp, dir)) < 0)
return -1;
if (rc == 0)
return 0;
while ((rc = virDirRead(dirp, &ent, dir)) > 0) {
g_autofree char *filename = NULL;
g_autofree char *path = NULL;
struct stat sb;
if (STRPREFIX(ent->d_name, "."))
continue;
filename = g_strdup(ent->d_name);
path = g_strdup_printf("%s/%s", dir, filename);
if (stat(path, &sb) < 0) {
virReportSystemError(errno, _("Unable to access %1$s"), path);
return -1;
}
if (!S_ISREG(sb.st_mode) && !S_ISLNK(sb.st_mode))
continue;
if (virHashUpdateEntry(files, filename, path) < 0)
return -1;
path = NULL;
}
if (rc < 0)
return -1;
return 0;
}
#define QEMU_CONFDIR SYSCONFDIR "/qemu"
int
qemuInteropFetchConfigs(const char *name,
char ***configs,
bool privileged)
{
g_autoptr(GHashTable) files = virHashNew(g_free);
g_autofree char *homeConfig = NULL;
g_autofree char *xdgConfig = NULL;
g_autofree char *dataLocation = virFileBuildPath(QEMU_DATADIR, name, NULL);
g_autofree char *confLocation = virFileBuildPath(QEMU_CONFDIR, name, NULL);
g_autofree virHashKeyValuePair *pairs = NULL;
size_t npairs;
virHashKeyValuePair *tmp = NULL;
size_t nconfigs = 0;
*configs = NULL;
if (!privileged) {
/* This is a slight divergence from the specification.
* Since the system daemon runs as root, it doesn't make
* much sense to parse files in root's home directory. It
* makes sense only for session daemon which runs under
* regular user. */
xdgConfig = g_strdup(getenv("XDG_CONFIG_HOME"));
if (!xdgConfig) {
g_autofree char *home = virGetUserDirectory();
xdgConfig = g_strdup_printf("%s/.config", home);
}
homeConfig = g_strdup_printf("%s/qemu/%s", xdgConfig, name);
}
if (qemuBuildFileList(files, dataLocation) < 0)
return -1;
if (qemuBuildFileList(files, confLocation) < 0)
return -1;
if (homeConfig &&
qemuBuildFileList(files, homeConfig) < 0)
return -1;
/* At this point, the @files hash table contains unique set of filenames
* where each filename (as key) has the highest priority full pathname
* associated with it. */
if (!(pairs = virHashGetItems(files, &npairs, true)))
return -1;
if (npairs == 0)
return 0;
*configs = g_new0(char *, npairs + 1);
for (tmp = pairs; tmp->key; tmp++) {
const char *path = tmp->value;
off_t len;
if ((len = virFileLength(path, -1)) < 0) {
virReportSystemError(errno,
_("unable to get size of '%1$s'"),
path);
return -1;
}
VIR_DEBUG("%s description path '%s' len=%jd",
name, path, (intmax_t) len);
if (len == 0) {
/* Empty files are used to mask less specific instances
* of the same file. */
continue;
}
(*configs)[nconfigs++] = g_strdup(path);
}
return 0;
}
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