/* 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; }
static int disk_create_qcow2 (guestfs_h *g, const char *orig_filename, int64_t size, const char *backingfile, const struct guestfs_disk_create_argv *optargs) { CLEANUP_FREE char *filename = NULL; const char *backingformat = NULL; const char *preallocation = NULL; const char *compat = NULL; int clustersize = -1; CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (optionsv); CLEANUP_CMD_CLOSE struct command *cmd = guestfs_int_new_command (g); int r; /* If the filename is something like "file:foo" then qemu-img will * try to interpret that as "foo" in the file:/// protocol. To * avoid that, if the path is relative prefix it with "./" since * qemu-img won't try to interpret such a path. */ if (orig_filename[0] != '/') filename = safe_asprintf (g, "./%s", orig_filename); else filename = safe_strdup (g, orig_filename); if (optargs->bitmask & GUESTFS_DISK_CREATE_BACKINGFORMAT_BITMASK) { backingformat = optargs->backingformat; /* Conservative whitelist. This can be extended with other * valid formats as required. */ if (STRNEQ (backingformat, "raw") && STRNEQ (backingformat, "qcow2") && STRNEQ (backingformat, "vmdk")) { error (g, _("invalid value for backingformat parameter '%s'"), backingformat); return -1; } } if (optargs->bitmask & GUESTFS_DISK_CREATE_PREALLOCATION_BITMASK) { if (STREQ (optargs->preallocation, "off") || STREQ (optargs->preallocation, "sparse")) preallocation = "off"; else if (STREQ (optargs->preallocation, "metadata")) preallocation = "metadata"; else if (STREQ (optargs->preallocation, "full")) /* Ugh: https://lists.gnu.org/archive/html/qemu-devel/2014-08/msg03863.html */ preallocation = "falloc"; else { error (g, _("invalid value for preallocation parameter '%s'"), preallocation); return -1; } } if (optargs->bitmask & GUESTFS_DISK_CREATE_COMPAT_BITMASK) { compat = optargs->compat; if (STRNEQ (compat, "0.10") && STRNEQ (compat, "1.1")) { error (g, _("invalid value for compat parameter '%s'"), compat); return -1; } } if (optargs->bitmask & GUESTFS_DISK_CREATE_CLUSTERSIZE_BITMASK) { clustersize = optargs->clustersize; if (clustersize < 512 || clustersize > 2097152 || !is_power_of_2 ((unsigned) clustersize)) { error (g, _("invalid value for clustersize parameter '%d'"), clustersize); return -1; } } /* Assemble the qemu-img command line. */ guestfs_int_cmd_add_arg (cmd, "qemu-img"); guestfs_int_cmd_add_arg (cmd, "create"); guestfs_int_cmd_add_arg (cmd, "-f"); guestfs_int_cmd_add_arg (cmd, "qcow2"); /* -o parameter. */ if (backingfile) { CLEANUP_FREE char *p = qemu_escape_param (g, backingfile); guestfs_int_add_sprintf (g, &optionsv, "backing_file=%s", p); } if (backingformat) guestfs_int_add_sprintf (g, &optionsv, "backing_fmt=%s", backingformat); if (preallocation) guestfs_int_add_sprintf (g, &optionsv, "preallocation=%s", preallocation); if (compat) guestfs_int_add_sprintf (g, &optionsv, "compat=%s", compat); if (clustersize >= 0) guestfs_int_add_sprintf (g, &optionsv, "cluster_size=%d", clustersize); guestfs_int_end_stringsbuf (g, &optionsv); if (optionsv.size > 1) { CLEANUP_FREE char *options = guestfs_int_join_strings (",", optionsv.argv); guestfs_int_cmd_add_arg (cmd, "-o"); guestfs_int_cmd_add_arg (cmd, options); } /* Complete the command line. */ guestfs_int_cmd_add_arg (cmd, filename); if (size >= 0) guestfs_int_cmd_add_arg_format (cmd, "%" PRIi64, size); r = guestfs_int_cmd_run (cmd); if (!WIFEXITED (r) || WEXITSTATUS (r) != 0) { guestfs_int_external_command_failed (g, r, "qemu-img", orig_filename); return -1; } return 0; }