static void
test_stringsbuf (void)
{
guestfs_h *g;
DECLARE_STRINGSBUF (sb);
g = guestfs_create ();
assert (g);
guestfs_int_add_string (g, &sb, "aaa");
guestfs_int_add_string (g, &sb, "bbb");
guestfs_int_add_string (g, &sb, "ccc");
guestfs_int_add_string (g, &sb, "");
guestfs_int_end_stringsbuf (g, &sb);
assert (sb.size == 5 /* 4 strings + terminating NULL */);
assert (STREQ (sb.argv[0], "aaa"));
assert (STREQ (sb.argv[1], "bbb"));
assert (STREQ (sb.argv[2], "ccc"));
assert (STREQ (sb.argv[3], ""));
assert (sb.argv[4] == NULL);
assert (guestfs_int_count_strings (sb.argv) == 4);
guestfs_int_free_stringsbuf (&sb);
guestfs_close (g);
}
/* Use vfs-type to look for a filesystem of some sort on 'dev'.
* Apart from some types which we ignore, add the result to the
* 'ret' string list.
*/
static int
check_with_vfs_type (guestfs_h *g, const char *device, struct stringsbuf *sb)
{
const char *v;
CLEANUP_FREE char *vfs_type = NULL;
guestfs_push_error_handler (g, NULL, NULL);
vfs_type = guestfs_vfs_type (g, device);
guestfs_pop_error_handler (g);
if (!vfs_type)
v = "unknown";
else if (STREQ (vfs_type, ""))
v = "unknown";
else if (STREQ (vfs_type, "btrfs")) {
CLEANUP_FREE_BTRFSSUBVOLUME_LIST struct guestfs_btrfssubvolume_list *vols =
guestfs_btrfs_subvolume_list (g, device);
if (vols == NULL)
return -1;
for (size_t i = 0; i < vols->len; i++) {
struct guestfs_btrfssubvolume *this = &vols->val[i];
guestfs_int_add_sprintf (g, sb,
"btrfsvol:%s/%s",
device, this->btrfssubvolume_path);
guestfs_int_add_string (g, sb, "btrfs");
}
v = vfs_type;
}
/* Use vfs-type to look for a filesystem of some sort on 'dev'.
* Apart from some types which we ignore, add the result to the
* 'ret' string list.
*/
static int
check_with_vfs_type (guestfs_h *g, const char *device, struct stringsbuf *sb)
{
const char *v;
CLEANUP_FREE char *vfs_type = NULL;
guestfs_push_error_handler (g, NULL, NULL);
vfs_type = guestfs_vfs_type (g, device);
guestfs_pop_error_handler (g);
if (!vfs_type)
v = "unknown";
else if (STREQ (vfs_type, ""))
v = "unknown";
else if (STREQ (vfs_type, "btrfs")) {
CLEANUP_FREE_BTRFSSUBVOLUME_LIST struct guestfs_btrfssubvolume_list *vols =
guestfs_btrfs_subvolume_list (g, device);
if (vols == NULL)
return -1;
int64_t default_volume = guestfs_btrfs_subvolume_get_default (g, device);
for (size_t i = 0; i < vols->len; i++) {
struct guestfs_btrfssubvolume *this = &vols->val[i];
/* Ignore the default subvolume. We get it by simply mounting
* the whole device of this btrfs filesystem.
*/
if (this->btrfssubvolume_id == (uint64_t) default_volume)
continue;
guestfs_int_add_sprintf (g, sb,
"btrfsvol:%s/%s",
device, this->btrfssubvolume_path);
guestfs_int_add_string (g, sb, "btrfs");
}
v = vfs_type;
}
/**
* Construct the Linux command line passed to the appliance. This is
* used by the C<direct> and C<libvirt> backends, and is simply
* located in this file because it's a convenient place for this
* common code.
*
* The C<appliance_dev> parameter must be the full device name of the
* appliance disk and must have already been adjusted to take into
* account virtio-blk or virtio-scsi; eg C</dev/sdb>.
*
* The C<flags> parameter can contain the following flags logically
* or'd together (or 0):
*
* =over 4
*
* =item C<APPLIANCE_COMMAND_LINE_IS_TCG>
*
* If we are launching a qemu TCG guest (ie. KVM is known to be
* disabled or unavailable). If you don't know, don't pass this flag.
*
* =back
*
* Note that this function returns a newly allocated buffer which must
* be freed by the caller.
*/
char *
guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,
int flags)
{
CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (argv);
char *term = getenv ("TERM");
bool tcg = flags & APPLIANCE_COMMAND_LINE_IS_TCG;
char *ret;
/* We assemble the kernel command line by simply joining the final
* list of strings with spaces. This means (a) the strings are not
* quoted (it's not clear if the kernel can handle quoting in any
* case), and (b) we can append multiple parameters in a single
* argument, as we must do for the g->append parameter.
*/
/* Force kernel to panic if daemon exits. */
guestfs_int_add_string (g, &argv, "panic=1");
#ifdef __arm__
guestfs_int_add_sprintf (g, &argv, "mem=%dM", g->memsize);
#endif
#ifdef __i386__
/* Workaround for RHBZ#857026. */
guestfs_int_add_string (g, &argv, "noapic");
#endif
/* Serial console. */
guestfs_int_add_string (g, &argv, SERIAL_CONSOLE);
#ifdef EARLYPRINTK
/* Get messages from early boot. */
guestfs_int_add_string (g, &argv, EARLYPRINTK);
#endif
#ifdef __aarch64__
guestfs_int_add_string (g, &argv, "ignore_loglevel");
/* This option turns off the EFI RTC device. QEMU VMs don't
* currently provide EFI, and if the device is compiled in it
* will try to call the EFI function GetTime unconditionally
* (causing a call to NULL). However this option requires a
* non-upstream patch.
*/
guestfs_int_add_string (g, &argv, "efi-rtc=noprobe");
#endif
/* RHBZ#1404287 */
guestfs_int_add_string (g, &argv, "edd=off");
/* For slow systems (RHBZ#480319, RHBZ#1096579). */
guestfs_int_add_string (g, &argv, "udevtimeout=6000");
/* Same as above, for newer udevd. */
guestfs_int_add_string (g, &argv, "udev.event-timeout=6000");
/* Fix for RHBZ#502058. */
guestfs_int_add_string (g, &argv, "no_timer_check");
if (tcg) {
const int lpj = guestfs_int_get_lpj (g);
if (lpj > 0)
guestfs_int_add_sprintf (g, &argv, "lpj=%d", lpj);
}
/* Display timestamp before kernel messages. */
guestfs_int_add_string (g, &argv, "printk.time=1");
/* Saves us about 5 MB of RAM. */
guestfs_int_add_string (g, &argv, "cgroup_disable=memory");
/* Disable USB, only saves about 1ms. */
guestfs_int_add_string (g, &argv, "usbcore.nousb");
/* Disable crypto tests, saves 28ms. */
guestfs_int_add_string (g, &argv, "cryptomgr.notests");
/* Don't synch TSCs when using SMP. Saves 21ms for each secondary vCPU. */
guestfs_int_add_string (g, &argv, "tsc=reliable");
/* Don't scan all 8250 UARTS. */
guestfs_int_add_string (g, &argv, "8250.nr_uarts=1");
/* Tell supermin about the appliance device. */
if (appliance_dev)
guestfs_int_add_sprintf (g, &argv, "root=%s", appliance_dev);
/* SELinux - deprecated setting, never worked and should not be enabled. */
if (g->selinux)
guestfs_int_add_string (g, &argv, "selinux=1 enforcing=0");
else
guestfs_int_add_string (g, &argv, "selinux=0");
/* Quiet/verbose. */
if (g->verbose)
guestfs_int_add_string (g, &argv, "guestfs_verbose=1");
else
guestfs_int_add_string (g, &argv, "quiet");
/* Network. */
if (g->enable_network)
guestfs_int_add_string (g, &argv, "guestfs_network=1");
/* TERM environment variable. */
if (term && valid_term (term))
guestfs_int_add_sprintf (g, &argv, "TERM=%s", term);
else
guestfs_int_add_string (g, &argv, "TERM=linux");
/* Handle identifier. */
if (STRNEQ (g->identifier, ""))
guestfs_int_add_sprintf (g, &argv, "guestfs_identifier=%s", g->identifier);
/* Append extra arguments. */
if (g->append)
guestfs_int_add_string (g, &argv, g->append);
guestfs_int_end_stringsbuf (g, &argv);
/* Caller frees. */
ret = guestfs_int_join_strings (" ", argv.argv);
if (ret == NULL)
g->abort_cb ();
return ret;
}
