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https://github.com/libguestfs/libguestfs.git
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Rename src/ to lib/
This commit is contained in:
Richard W.M. Jones
205
lib/appliance-kcmdline.c
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205
lib/appliance-kcmdline.c
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/* libguestfs
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* Copyright (C) 2009-2017 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* The appliance kernel command line.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include "c-ctype.h"
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#include "guestfs.h"
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#include "guestfs-internal.h"
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/**
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* Check that the $TERM environment variable is reasonable before
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* we pass it through to the appliance.
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*/
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#define VALID_TERM(term) \
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guestfs_int_string_is_valid ((term), 1, 16, \
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VALID_FLAG_ALPHA|VALID_FLAG_DIGIT, "-_")
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#if defined(__powerpc64__)
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#define SERIAL_CONSOLE "console=hvc0 console=ttyS0"
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#elif defined(__arm__) || defined(__aarch64__)
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#define SERIAL_CONSOLE "console=ttyAMA0"
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#else
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#define SERIAL_CONSOLE "console=ttyS0"
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#endif
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#if defined(__aarch64__)
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#define EARLYPRINTK "earlyprintk=pl011,0x9000000"
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#endif
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/**
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* Construct the Linux command line passed to the appliance. This is
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* used by the C<direct> and C<libvirt> backends, and is simply
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* located in this file because it's a convenient place for this
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* common code.
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*
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* The C<appliance_dev> parameter must be the full device name of the
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* appliance disk and must have already been adjusted to take into
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* account virtio-blk or virtio-scsi; eg C</dev/sdb>.
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*
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* The C<flags> parameter can contain the following flags logically
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* or'd together (or 0):
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*
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* =over 4
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*
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* =item C<APPLIANCE_COMMAND_LINE_IS_TCG>
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*
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* If we are launching a qemu TCG guest (ie. KVM is known to be
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* disabled or unavailable). If you don't know, don't pass this flag.
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*
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* =back
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*
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* Note that this function returns a newly allocated buffer which must
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* be freed by the caller.
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*/
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char *
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guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,
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int flags)
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{
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CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (argv);
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char *term = getenv ("TERM");
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bool tcg = flags & APPLIANCE_COMMAND_LINE_IS_TCG;
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char *ret;
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/* We assemble the kernel command line by simply joining the final
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* list of strings with spaces. This means (a) the strings are not
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* quoted (it's not clear if the kernel can handle quoting in any
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* case), and (b) we can append multiple parameters in a single
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* argument, as we must do for the g->append parameter.
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*/
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/* Force kernel to panic if daemon exits. */
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guestfs_int_add_string (g, &argv, "panic=1");
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#ifdef __arm__
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guestfs_int_add_sprintf (g, &argv, "mem=%dM", g->memsize);
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#endif
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#ifdef __i386__
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/* Workaround for RHBZ#857026. */
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guestfs_int_add_string (g, &argv, "noapic");
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#endif
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/* Serial console. */
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guestfs_int_add_string (g, &argv, SERIAL_CONSOLE);
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#ifdef EARLYPRINTK
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/* Get messages from early boot. */
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guestfs_int_add_string (g, &argv, EARLYPRINTK);
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#endif
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#ifdef __aarch64__
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guestfs_int_add_string (g, &argv, "ignore_loglevel");
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/* This option turns off the EFI RTC device. QEMU VMs don't
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* currently provide EFI, and if the device is compiled in it
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* will try to call the EFI function GetTime unconditionally
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* (causing a call to NULL). However this option requires a
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* non-upstream patch.
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*/
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guestfs_int_add_string (g, &argv, "efi-rtc=noprobe");
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#endif
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/* RHBZ#1404287 */
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guestfs_int_add_string (g, &argv, "edd=off");
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/* For slow systems (RHBZ#480319, RHBZ#1096579). */
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guestfs_int_add_string (g, &argv, "udevtimeout=6000");
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/* Same as above, for newer udevd. */
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guestfs_int_add_string (g, &argv, "udev.event-timeout=6000");
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/* Fix for RHBZ#502058. */
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guestfs_int_add_string (g, &argv, "no_timer_check");
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if (tcg) {
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const int lpj = guestfs_int_get_lpj (g);
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if (lpj > 0)
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guestfs_int_add_sprintf (g, &argv, "lpj=%d", lpj);
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}
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/* Display timestamp before kernel messages. */
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guestfs_int_add_string (g, &argv, "printk.time=1");
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/* Saves us about 5 MB of RAM. */
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guestfs_int_add_string (g, &argv, "cgroup_disable=memory");
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/* Disable USB, only saves about 1ms. */
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guestfs_int_add_string (g, &argv, "usbcore.nousb");
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/* Disable crypto tests, saves 28ms. */
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guestfs_int_add_string (g, &argv, "cryptomgr.notests");
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/* Don't synch TSCs when using SMP. Saves 21ms for each secondary vCPU. */
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guestfs_int_add_string (g, &argv, "tsc=reliable");
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/* Don't scan all 8250 UARTS. */
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guestfs_int_add_string (g, &argv, "8250.nr_uarts=1");
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/* Tell supermin about the appliance device. */
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if (appliance_dev)
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guestfs_int_add_sprintf (g, &argv, "root=%s", appliance_dev);
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/* SELinux - deprecated setting, never worked and should not be enabled. */
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if (g->selinux)
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guestfs_int_add_string (g, &argv, "selinux=1 enforcing=0");
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else
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guestfs_int_add_string (g, &argv, "selinux=0");
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/* Quiet/verbose. */
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if (g->verbose)
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guestfs_int_add_string (g, &argv, "guestfs_verbose=1");
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else
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guestfs_int_add_string (g, &argv, "quiet");
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/* Network. */
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if (g->enable_network)
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guestfs_int_add_string (g, &argv, "guestfs_network=1");
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/* TERM environment variable. */
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if (term && VALID_TERM (term))
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guestfs_int_add_sprintf (g, &argv, "TERM=%s", term);
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else
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guestfs_int_add_string (g, &argv, "TERM=linux");
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/* Handle identifier. */
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if (STRNEQ (g->identifier, ""))
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guestfs_int_add_sprintf (g, &argv, "guestfs_identifier=%s", g->identifier);
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/* Append extra arguments. */
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if (g->append)
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guestfs_int_add_string (g, &argv, g->append);
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guestfs_int_end_stringsbuf (g, &argv);
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/* Caller frees. */
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ret = guestfs_int_join_strings (" ", argv.argv);
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if (ret == NULL)
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g->abort_cb ();
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return ret;
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}
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