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https://github.com/libguestfs/libguestfs.git
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50d2af4f85
These calls allow you to query the relationship between LVM objects, for example, which PVs contain a VG, or which LVs are contained in a VG. See the example / test program 'regressions/test-lvm-mapping.pl' for an example of how to do this from Perl.
598 lines
10 KiB
C
598 lines
10 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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 <string.h>
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#include <unistd.h>
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#include "daemon.h"
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#include "c-ctype.h"
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#include "actions.h"
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#include "optgroups.h"
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int
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optgroup_lvm2_available (void)
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{
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int r = access ("/sbin/lvm", X_OK);
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return r == 0;
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}
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/* LVM actions. Keep an eye on liblvm, although at the time
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* of writing it hasn't progressed very far.
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*/
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static char **
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convert_lvm_output (char *out, const char *prefix)
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{
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char *p, *pend;
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char **r = NULL;
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int size = 0, alloc = 0;
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int len;
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char buf[256];
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char *str;
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p = out;
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while (p) {
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pend = strchr (p, '\n'); /* Get the next line of output. */
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if (pend) {
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*pend = '\0';
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pend++;
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}
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while (*p && c_isspace (*p)) /* Skip any leading whitespace. */
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p++;
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/* Sigh, skip trailing whitespace too. "pvs", I'm looking at you. */
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len = strlen (p)-1;
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while (*p && c_isspace (p[len]))
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p[len--] = '\0';
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if (!*p) { /* Empty line? Skip it. */
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p = pend;
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continue;
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}
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/* Prefix? */
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if (prefix) {
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snprintf (buf, sizeof buf, "%s%s", prefix, p);
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str = buf;
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} else
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str = p;
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if (add_string (&r, &size, &alloc, str) == -1) {
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free (out);
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return NULL;
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}
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p = pend;
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}
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free (out);
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if (add_string (&r, &size, &alloc, NULL) == -1)
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return NULL;
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sort_strings (r, size-1);
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return r;
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}
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char **
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do_pvs (void)
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{
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char *out, *err;
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int r;
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r = command (&out, &err,
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"/sbin/lvm", "pvs", "-o", "pv_name", "--noheadings", NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (out);
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free (err);
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return NULL;
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}
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free (err);
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return convert_lvm_output (out, NULL);
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}
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char **
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do_vgs (void)
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{
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char *out, *err;
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int r;
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r = command (&out, &err,
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"/sbin/lvm", "vgs", "-o", "vg_name", "--noheadings", NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (out);
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free (err);
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return NULL;
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}
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free (err);
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return convert_lvm_output (out, NULL);
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}
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char **
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do_lvs (void)
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{
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char *out, *err;
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int r;
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r = command (&out, &err,
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"/sbin/lvm", "lvs",
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"-o", "vg_name,lv_name", "--noheadings",
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"--separator", "/", NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (out);
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free (err);
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return NULL;
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}
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free (err);
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return convert_lvm_output (out, "/dev/");
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}
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/* These were so complex to implement that I ended up auto-generating
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* the code. That code is in stubs.c, and it is generated as usual
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* by generator.ml.
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*/
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guestfs_int_lvm_pv_list *
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do_pvs_full (void)
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{
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return parse_command_line_pvs ();
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}
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guestfs_int_lvm_vg_list *
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do_vgs_full (void)
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{
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return parse_command_line_vgs ();
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}
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guestfs_int_lvm_lv_list *
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do_lvs_full (void)
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{
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return parse_command_line_lvs ();
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}
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int
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do_pvcreate (const char *device)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "pvcreate", device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_vgcreate (const char *volgroup, char *const *physvols)
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{
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char *err;
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int r, argc, i;
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const char **argv;
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argc = count_strings (physvols) + 3;
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argv = malloc (sizeof (char *) * (argc + 1));
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if (argv == NULL) {
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reply_with_perror ("malloc");
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return -1;
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}
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argv[0] = "/sbin/lvm";
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argv[1] = "vgcreate";
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argv[2] = volgroup;
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for (i = 3; i <= argc; ++i)
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argv[i] = physvols[i-3];
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r = commandv (NULL, &err, (const char * const*) argv);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_lvcreate (const char *logvol, const char *volgroup, int mbytes)
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{
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char *err;
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int r;
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char size[64];
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snprintf (size, sizeof size, "%d", mbytes);
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r = command (NULL, &err,
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"/sbin/lvm", "lvcreate",
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"-L", size, "-n", logvol, volgroup, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_lvresize (const char *logvol, int mbytes)
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{
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char *err;
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int r;
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char size[64];
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snprintf (size, sizeof size, "%d", mbytes);
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r = command (NULL, &err,
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"/sbin/lvm", "lvresize",
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"-L", size, logvol, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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/* Super-dangerous command used for testing. It removes all
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* LVs, VGs and PVs permanently.
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*/
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int
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do_lvm_remove_all (void)
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{
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char **xs;
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int i, r;
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char *err;
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/* Remove LVs. */
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xs = do_lvs ();
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if (xs == NULL)
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return -1;
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for (i = 0; xs[i] != NULL; ++i) {
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r = command (NULL, &err, "/sbin/lvm", "lvremove", "-f", xs[i], NULL);
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if (r == -1) {
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reply_with_error ("lvremove: %s: %s", xs[i], err);
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free (err);
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free_strings (xs);
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return -1;
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}
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free (err);
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}
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free_strings (xs);
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/* Remove VGs. */
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xs = do_vgs ();
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if (xs == NULL)
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return -1;
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for (i = 0; xs[i] != NULL; ++i) {
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r = command (NULL, &err, "/sbin/lvm", "vgremove", "-f", xs[i], NULL);
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if (r == -1) {
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reply_with_error ("vgremove: %s: %s", xs[i], err);
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free (err);
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free_strings (xs);
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return -1;
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}
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free (err);
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}
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free_strings (xs);
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/* Remove PVs. */
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xs = do_pvs ();
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if (xs == NULL)
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return -1;
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for (i = 0; xs[i] != NULL; ++i) {
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r = command (NULL, &err, "/sbin/lvm", "pvremove", "-f", xs[i], NULL);
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if (r == -1) {
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reply_with_error ("pvremove: %s: %s", xs[i], err);
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free (err);
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free_strings (xs);
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return -1;
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}
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free (err);
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}
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free_strings (xs);
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udev_settle ();
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/* There, that was easy, sorry about your data. */
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return 0;
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}
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int
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do_lvremove (const char *device)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "lvremove", "-f", device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_vgremove (const char *device)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "vgremove", "-f", device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_pvremove (const char *device)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "pvremove", "-ff", device, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_pvresize (const char *device)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "pvresize", device, NULL);
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if (r == -1) {
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reply_with_error ("%s: %s", device, err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_vg_activate (int activate, char *const *volgroups)
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{
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char *err;
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int r, i, argc;
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const char **argv;
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argc = count_strings (volgroups) + 4;
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argv = malloc (sizeof (char *) * (argc+1));
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if (argv == NULL) {
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reply_with_perror ("malloc");
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return -1;
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}
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argv[0] = "/sbin/lvm";
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argv[1] = "vgchange";
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argv[2] = "-a";
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argv[3] = activate ? "y" : "n";
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for (i = 4; i <= argc; ++i)
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argv[i] = volgroups[i-4];
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r = commandv (NULL, &err, (const char * const*) argv);
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if (r == -1) {
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reply_with_error ("vgchange: %s", err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_vg_activate_all (int activate)
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{
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char *empty[] = { NULL };
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return do_vg_activate (activate, empty);
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}
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int
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do_lvrename (const char *logvol, const char *newlogvol)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "lvrename",
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logvol, newlogvol, NULL);
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if (r == -1) {
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reply_with_error ("%s -> %s: %s", logvol, newlogvol, err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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int
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do_vgrename (const char *volgroup, const char *newvolgroup)
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{
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char *err;
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int r;
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r = command (NULL, &err,
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"/sbin/lvm", "vgrename",
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volgroup, newvolgroup, NULL);
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if (r == -1) {
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reply_with_error ("%s -> %s: %s", volgroup, newvolgroup, err);
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free (err);
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return -1;
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}
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free (err);
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udev_settle ();
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return 0;
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}
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static char *
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get_lvm_field (const char *cmd, const char *field, const char *device)
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{
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char *out;
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char *err;
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int r = command (&out, &err,
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"/sbin/lvm", cmd,
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"--unbuffered", "--noheadings", "-o", field,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s: %s", device, err);
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free (out);
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free (err);
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return NULL;
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}
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free (err);
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trim (out);
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return out; /* Caller frees. */
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}
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char *
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do_pvuuid (const char *device)
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{
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return get_lvm_field ("pvs", "pv_uuid", device);
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}
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char *
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do_vguuid (const char *vgname)
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{
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return get_lvm_field ("vgs", "vg_uuid", vgname);
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}
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char *
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do_lvuuid (const char *device)
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{
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return get_lvm_field ("lvs", "lv_uuid", device);
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}
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static char **
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get_lvm_fields (const char *cmd, const char *field, const char *device)
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{
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char *out;
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char *err;
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int r = command (&out, &err,
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"/sbin/lvm", cmd,
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"--unbuffered", "--noheadings", "-o", field,
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device, NULL);
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if (r == -1) {
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reply_with_error ("%s: %s", device, err);
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free (out);
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free (err);
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return NULL;
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}
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free (err);
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char **ret = split_lines (out);
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free (out);
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if (ret == NULL)
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return NULL;
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size_t i;
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for (i = 0; ret[i] != NULL; ++i)
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trim (ret[i]);
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return ret;
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}
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char **
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do_vgpvuuids (const char *vgname)
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{
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return get_lvm_fields ("vgs", "pv_uuid", vgname);
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}
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char **
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do_vglvuuids (const char *vgname)
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{
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return get_lvm_fields ("vgs", "lv_uuid", vgname);
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}
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