New API: pvresize-size to allow shrinking PVs (RHBZ#585222).

[libguestfs.git] / daemon / lvm.c

diff --git a/daemon/lvm.c b/daemon/lvm.c
index 742b40b..70c3c90 100644 (file)
--- a/daemon/lvm.c
+++ b/daemon/lvm.c
@@ -20,12 +20,20 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <inttypes.h>
 #include <string.h>
 #include <unistd.h>
-#include <ctype.h>
 
 #include "daemon.h"
+#include "c-ctype.h"
 #include "actions.h"
+#include "optgroups.h"
+
+int
+optgroup_lvm2_available (void)
+{
+  return prog_exists ("lvm");
+}
 
 /* LVM actions.  Keep an eye on liblvm, although at the time
  * of writing it hasn't progressed very far.
@@ -49,12 +57,12 @@ convert_lvm_output (char *out, const char *prefix)
       pend++;
     }
 
-    while (*p && isspace (*p)) /* Skip any leading whitespace. */
+    while (*p && c_isspace (*p))       /* Skip any leading whitespace. */
       p++;
 
     /* Sigh, skip trailing whitespace too.  "pvs", I'm looking at you. */
     len = strlen (p)-1;
-    while (*p && isspace (p[len]))
+    while (*p && c_isspace (p[len]))
       p[len--] = '\0';
 
     if (!*p) {                 /* Empty line?  Skip it. */
@@ -93,7 +101,7 @@ do_pvs (void)
   int r;
 
   r = command (&out, &err,
-               "/sbin/lvm", "pvs", "-o", "pv_name", "--noheadings", NULL);
+               "lvm", "pvs", "-o", "pv_name", "--noheadings", NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (out);
@@ -113,7 +121,7 @@ do_vgs (void)
   int r;
 
   r = command (&out, &err,
-               "/sbin/lvm", "vgs", "-o", "vg_name", "--noheadings", NULL);
+               "lvm", "vgs", "-o", "vg_name", "--noheadings", NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (out);
@@ -133,7 +141,7 @@ do_lvs (void)
   int r;
 
   r = command (&out, &err,
-               "/sbin/lvm", "lvs",
+               "lvm", "lvs",
                "-o", "vg_name,lv_name", "--noheadings",
                "--separator", "/", NULL);
   if (r == -1) {
@@ -177,7 +185,7 @@ do_pvcreate (const char *device)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "pvcreate", device, NULL);
+               "lvm", "pvcreate", device, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (err);
@@ -204,13 +212,13 @@ do_vgcreate (const char *volgroup, char *const *physvols)
     reply_with_perror ("malloc");
     return -1;
   }
-  argv[0] = "/sbin/lvm";
+  argv[0] = "lvm";
   argv[1] = "vgcreate";
   argv[2] = volgroup;
   for (i = 3; i <= argc; ++i)
     argv[i] = physvols[i-3];
 
-  r = commandv (NULL, &err, (char **) argv);
+  r = commandv (NULL, &err, (const char * const*) argv);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (err);
@@ -234,7 +242,7 @@ do_lvcreate (const char *logvol, const char *volgroup, int mbytes)
   snprintf (size, sizeof size, "%d", mbytes);
 
   r = command (NULL, &err,
-               "/sbin/lvm", "lvcreate",
+               "lvm", "lvcreate",
                "-L", size, "-n", logvol, volgroup, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
@@ -259,10 +267,36 @@ do_lvresize (const char *logvol, int mbytes)
   snprintf (size, sizeof size, "%d", mbytes);
 
   r = command (NULL, &err,
-               "/sbin/lvm", "lvresize",
-               "-L", size, logvol, NULL);
+               "lvm", "lvresize",
+               "--force", "-L", size, logvol, NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}
+
+int
+do_lvresize_free (const char *logvol, int percent)
+{
+  char *err;
+  int r;
+
+  if (percent < 0 || percent > 100) {
+    reply_with_error ("percentage must be [0..100] (was %d)", percent);
+    return -1;
+  }
+
+  char size[64];
+  snprintf (size, sizeof size, "+%d%%FREE", percent);
+
+  r = command (NULL, &err,
+               "lvm", "lvresize", "-l", size, logvol, NULL);
   if (r == -1) {
-    reply_with_error ("lvresize: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -287,7 +321,7 @@ do_lvm_remove_all (void)
     return -1;
 
   for (i = 0; xs[i] != NULL; ++i) {
-    r = command (NULL, &err, "/sbin/lvm", "lvremove", "-f", xs[i], NULL);
+    r = command (NULL, &err, "lvm", "lvremove", "-f", xs[i], NULL);
     if (r == -1) {
       reply_with_error ("lvremove: %s: %s", xs[i], err);
       free (err);
@@ -304,7 +338,7 @@ do_lvm_remove_all (void)
     return -1;
 
   for (i = 0; xs[i] != NULL; ++i) {
-    r = command (NULL, &err, "/sbin/lvm", "vgremove", "-f", xs[i], NULL);
+    r = command (NULL, &err, "lvm", "vgremove", "-f", xs[i], NULL);
     if (r == -1) {
       reply_with_error ("vgremove: %s: %s", xs[i], err);
       free (err);
@@ -321,7 +355,7 @@ do_lvm_remove_all (void)
     return -1;
 
   for (i = 0; xs[i] != NULL; ++i) {
-    r = command (NULL, &err, "/sbin/lvm", "pvremove", "-f", xs[i], NULL);
+    r = command (NULL, &err, "lvm", "pvremove", "-f", xs[i], NULL);
     if (r == -1) {
       reply_with_error ("pvremove: %s: %s", xs[i], err);
       free (err);
@@ -345,7 +379,7 @@ do_lvremove (const char *device)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "lvremove", "-f", device, NULL);
+               "lvm", "lvremove", "-f", device, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (err);
@@ -366,7 +400,7 @@ do_vgremove (const char *device)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "vgremove", "-f", device, NULL);
+               "lvm", "vgremove", "-f", device, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (err);
@@ -387,7 +421,7 @@ do_pvremove (const char *device)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "pvremove", "-ff", device, NULL);
+               "lvm", "pvremove", "-ff", device, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
     free (err);
@@ -408,9 +442,32 @@ do_pvresize (const char *device)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "pvresize", device, NULL);
+               "lvm", "pvresize", device, NULL);
   if (r == -1) {
-    reply_with_error ("pvresize: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}
+
+int
+do_pvresize_size (const char *device, int64_t size)
+{
+  char *err;
+  int r;
+
+  char buf[32];
+  snprintf (buf, sizeof buf, "%" PRIi64 "b", size);
+
+  r = command (NULL, &err,
+               "lvm", "pvresize",
+               "--setphysicalvolumesize", buf,
+               device, NULL);
+  if (r == -1) {
+    reply_with_error ("%s: %s", device, err);
     free (err);
     return -1;
   }
@@ -433,14 +490,14 @@ do_vg_activate (int activate, char *const *volgroups)
     return -1;
   }
 
-  argv[0] = "/sbin/lvm";
+  argv[0] = "lvm";
   argv[1] = "vgchange";
   argv[2] = "-a";
   argv[3] = activate ? "y" : "n";
   for (i = 4; i <= argc; ++i)
     argv[i] = volgroups[i-4];
 
-  r = commandv (NULL, &err, (char **) argv);
+  r = commandv (NULL, &err, (const char * const*) argv);
   if (r == -1) {
     reply_with_error ("vgchange: %s", err);
     free (err);
@@ -460,3 +517,148 @@ do_vg_activate_all (int activate)
   char *empty[] = { NULL };
   return do_vg_activate (activate, empty);
 }
+
+int
+do_lvrename (const char *logvol, const char *newlogvol)
+{
+  char *err;
+  int r;
+
+  r = command (NULL, &err,
+               "lvm", "lvrename",
+               logvol, newlogvol, NULL);
+  if (r == -1) {
+    reply_with_error ("%s -> %s: %s", logvol, newlogvol, err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+
+  udev_settle ();
+
+  return 0;
+}
+
+int
+do_vgrename (const char *volgroup, const char *newvolgroup)
+{
+  char *err;
+  int r;
+
+  r = command (NULL, &err,
+               "lvm", "vgrename",
+               volgroup, newvolgroup, NULL);
+  if (r == -1) {
+    reply_with_error ("%s -> %s: %s", volgroup, newvolgroup, err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+
+  udev_settle ();
+
+  return 0;
+}
+
+static char *
+get_lvm_field (const char *cmd, const char *field, const char *device)
+{
+  char *out;
+  char *err;
+  int r = command (&out, &err,
+                   "lvm", cmd,
+                   "--unbuffered", "--noheadings", "-o", field,
+                   device, NULL);
+  if (r == -1) {
+    reply_with_error ("%s: %s", device, err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  trim (out);
+  return out;                   /* Caller frees. */
+}
+
+char *
+do_pvuuid (const char *device)
+{
+  return get_lvm_field ("pvs", "pv_uuid", device);
+}
+
+char *
+do_vguuid (const char *vgname)
+{
+  return get_lvm_field ("vgs", "vg_uuid", vgname);
+}
+
+char *
+do_lvuuid (const char *device)
+{
+  return get_lvm_field ("lvs", "lv_uuid", device);
+}
+
+static char **
+get_lvm_fields (const char *cmd, const char *field, const char *device)
+{
+  char *out;
+  char *err;
+  int r = command (&out, &err,
+                   "lvm", cmd,
+                   "--unbuffered", "--noheadings", "-o", field,
+                   device, NULL);
+  if (r == -1) {
+    reply_with_error ("%s: %s", device, err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  char **ret = split_lines (out);
+  free (out);
+
+  if (ret == NULL)
+    return NULL;
+
+  size_t i;
+  for (i = 0; ret[i] != NULL; ++i)
+    trim (ret[i]);
+
+  return ret;
+}
+
+char **
+do_vgpvuuids (const char *vgname)
+{
+  return get_lvm_fields ("vgs", "pv_uuid", vgname);
+}
+
+char **
+do_vglvuuids (const char *vgname)
+{
+  return get_lvm_fields ("vgs", "lv_uuid", vgname);
+}
+
+int
+do_vgscan (void)
+{
+  char *err;
+  int r;
+
+  r = command (NULL, &err,
+               "lvm", "vgscan", NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}