Example #1
0
int64_t ga_get_fd_handle(GAState *s, Error **errp)
{
    int64_t handle;

    g_assert(s->pstate_filepath);
    /* we blacklist commands and avoid operations that potentially require
     * writing to disk when we're in a frozen state. this includes opening
     * new files, so we should never get here in that situation
     */
    g_assert(!ga_is_frozen(s));

    handle = s->pstate.fd_counter++;

    /* This should never happen on a reasonable timeframe, as guest-file-open
     * would have to be issued 2^63 times */
    if (s->pstate.fd_counter == INT64_MAX) {
        abort();
    }

    if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
        error_setg(errp, "failed to commit persistent state to disk");
        return -1;
    }

    return handle;
}
Example #2
0
int64_t ga_get_fd_handle(GAState *s, Error **errp)
{
    int64_t handle;

    g_assert(s->pstate_filepath);
    /* we blacklist commands and avoid operations that potentially require
     * writing to disk when we're in a frozen state. this includes opening
     * new files, so we should never get here in that situation
     */
    g_assert(!ga_is_frozen(s));

    handle = s->pstate.fd_counter++;
    if (s->pstate.fd_counter < 0) {
        s->pstate.fd_counter = 0;
    }
    if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
        error_setg(errp, "failed to commit persistent state to disk");
    }

    return handle;
}
Example #3
0
static gboolean read_persistent_state(GAPersistentState *pstate,
                                      const gchar *path, gboolean frozen)
{
    GKeyFile *keyfile = NULL;
    GError *gerr = NULL;
    struct stat st;
    gboolean ret = true;

    g_assert(pstate);

    if (stat(path, &st) == -1) {
        /* it's okay if state file doesn't exist, but any other error
         * indicates a permissions issue or some other misconfiguration
         * that we likely won't be able to recover from.
         */
        if (errno != ENOENT) {
            g_critical("unable to access state file at path %s: %s",
                       path, strerror(errno));
            ret = false;
            goto out;
        }

        /* file doesn't exist. initialize state to default values and
         * attempt to save now. (we could wait till later when we have
         * modified state we need to commit, but if there's a problem,
         * such as a missing parent directory, we want to catch it now)
         *
         * there is a potential scenario where someone either managed to
         * update the agent from a version that didn't use a key store
         * while qemu-ga thought the filesystem was frozen, or
         * deleted the key store prior to issuing a fsfreeze, prior
         * to restarting the agent. in this case we go ahead and defer
         * initial creation till we actually have modified state to
         * write, otherwise fail to recover from freeze.
         */
        set_persistent_state_defaults(pstate);
        if (!frozen) {
            ret = write_persistent_state(pstate, path);
            if (!ret) {
                g_critical("unable to create state file at path %s", path);
                ret = false;
                goto out;
            }
        }
        ret = true;
        goto out;
    }

    keyfile = g_key_file_new();
    g_key_file_load_from_file(keyfile, path, 0, &gerr);
    if (gerr) {
        g_critical("error loading persistent state from path: %s, %s",
                   path, gerr->message);
        ret = false;
        goto out;
    }

    persistent_state_from_keyfile(pstate, keyfile);

out:
    if (keyfile) {
        g_key_file_free(keyfile);
    }
    if (gerr) {
        g_error_free(gerr);
    }

    return ret;
}
static gboolean read_persistent_state(GAPersistentState *pstate,
                                      const gchar *path, gboolean frozen)
{
    GKeyFile *keyfile = NULL;
    GError *gerr = NULL;
    struct stat st;
    gboolean ret = true;

    g_assert(pstate);

#ifdef USE_ANDROID_EMU
    if (android_stat(path, &st) == -1) {
#else  // !USE_ANDROID_EMU
    if (stat(path, &st) == -1) {
#endif  // USE_ANDROID_EMU
        /* it's okay if state file doesn't exist, but any other error
         * indicates a permissions issue or some other misconfiguration
         * that we likely won't be able to recover from.
         */
        if (errno != ENOENT) {
            g_critical("unable to access state file at path %s: %s",
                       path, strerror(errno));
            ret = false;
            goto out;
        }

        /* file doesn't exist. initialize state to default values and
         * attempt to save now. (we could wait till later when we have
         * modified state we need to commit, but if there's a problem,
         * such as a missing parent directory, we want to catch it now)
         *
         * there is a potential scenario where someone either managed to
         * update the agent from a version that didn't use a key store
         * while qemu-ga thought the filesystem was frozen, or
         * deleted the key store prior to issuing a fsfreeze, prior
         * to restarting the agent. in this case we go ahead and defer
         * initial creation till we actually have modified state to
         * write, otherwise fail to recover from freeze.
         */
        set_persistent_state_defaults(pstate);
        if (!frozen) {
            ret = write_persistent_state(pstate, path);
            if (!ret) {
                g_critical("unable to create state file at path %s", path);
                ret = false;
                goto out;
            }
        }
        ret = true;
        goto out;
    }

    keyfile = g_key_file_new();
    g_key_file_load_from_file(keyfile, path, 0, &gerr);
    if (gerr) {
        g_critical("error loading persistent state from path: %s, %s",
                   path, gerr->message);
        ret = false;
        goto out;
    }

    persistent_state_from_keyfile(pstate, keyfile);

out:
    if (keyfile) {
        g_key_file_free(keyfile);
    }
    if (gerr) {
        g_error_free(gerr);
    }

    return ret;
}

int64_t ga_get_fd_handle(GAState *s, Error **errp)
{
    int64_t handle;

    g_assert(s->pstate_filepath);
    /* we blacklist commands and avoid operations that potentially require
     * writing to disk when we're in a frozen state. this includes opening
     * new files, so we should never get here in that situation
     */
    g_assert(!ga_is_frozen(s));

    handle = s->pstate.fd_counter++;

    /* This should never happen on a reasonable timeframe, as guest-file-open
     * would have to be issued 2^63 times */
    if (s->pstate.fd_counter == INT64_MAX) {
        abort();
    }

    if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
        error_setg(errp, "failed to commit persistent state to disk");
        return -1;
    }

    return handle;
}