appliance: Set $PATH instead of hard-coding paths to binaries everywhere.

Change the appliance so PATH includes common directories.  Thus
we don't need to hard-code paths to binaries (eg. "/sbin/fdisk")
everywhere.

17 files changed, 91 insertions, 70 deletions

diff --git a/appliance/init b/appliance/init
index 84ee96e3..fe01e005 100755
--- a/appliance/init
+++ b/appliance/init
@@ -2,7 +2,8 @@
 
 echo Starting /init script ...
 
-PATH=/sbin:/usr/sbin:$PATH
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+export PATH
 
 mount -t proc /proc /proc
 mount -t sysfs /sys /sys
diff --git a/daemon/blkid.c b/daemon/blkid.c
index 4c77b82a..dcfac65d 100644
--- a/daemon/blkid.c
+++ b/daemon/blkid.c
@@ -34,7 +34,7 @@ do_vfs_type (const char *device)
   int r;
 
   r = command (&out, &err,
-               "/sbin/blkid", "-o", "value", "-s", "TYPE", device, NULL);
+               "blkid", "-o", "value", "-s", "TYPE", device, NULL);
   if (r == -1) {
     reply_with_error ("%s: %s", device, err);
     free (out);
diff --git a/daemon/blockdev.c b/daemon/blockdev.c
index 95e5246c..3df1807d 100644
--- a/daemon/blockdev.c
+++ b/daemon/blockdev.c
@@ -38,7 +38,7 @@ call_blockdev (const char *device, const char *switc, int extraarg, int prints)
   int64_t rv;
   char *out, *err;
   const char *argv[] = {
-    "/sbin/blockdev",
+    "blockdev",
     switc,
     NULL,
     NULL,
diff --git a/daemon/daemon.h b/daemon/daemon.h
index 777cf332..19dd69cd 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -70,6 +70,8 @@ extern void trim (char *str);
 
 extern int device_name_translation (char *device, const char *func);
 
+extern int prog_exists (const char *prog);
+
 extern void udev_settle (void);
 
 /* This just stops gcc from giving a warning about our custom
diff --git a/daemon/ext2.c b/daemon/ext2.c
index c90ee05c..3758f4ee 100644
--- a/daemon/ext2.c
+++ b/daemon/ext2.c
@@ -43,11 +43,11 @@ e2prog (char *name)
   p++;
 
   *p = '4';
-  if (access (name, X_OK) == 0)
+  if (prog_exists (name))
     return 0;
 
   *p = '2';
-  if (access (name, X_OK) == 0)
+  if (prog_exists (name))
     return 0;
 
   reply_with_error ("cannot find required program %s", name);
@@ -63,7 +63,7 @@ do_tune2fs_l (const char *device)
   char **ret = NULL;
   int size = 0, alloc = 0;
 
-  char prog[] = "/sbin/tune2fs";
+  char prog[] = "tune2fs";
   if (e2prog (prog) == -1)
     return NULL;
 
@@ -151,7 +151,7 @@ do_set_e2label (const char *device, const char *label)
   int r;
   char *err;
 
-  char prog[] = "/sbin/e2label";
+  char prog[] = "e2label";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -172,7 +172,7 @@ do_get_e2label (const char *device)
   int r, len;
   char *out, *err;
 
-  char prog[] = "/sbin/e2label";
+  char prog[] = "e2label";
   if (e2prog (prog) == -1)
     return NULL;
 
@@ -200,7 +200,7 @@ do_set_e2uuid (const char *device, const char *uuid)
   int r;
   char *err;
 
-  char prog[] = "/sbin/tune2fs";
+  char prog[] = "tune2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -225,7 +225,7 @@ do_get_e2uuid (const char *device)
    * to use tune2fs -l and then look for a particular string in
    * the output.
    */
-  char prog[] = "/sbin/tune2fs";
+  char prog[] = "tune2fs";
   if (e2prog (prog) == -1)
     return NULL;
 
@@ -285,7 +285,7 @@ do_resize2fs (const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/resize2fs";
+  char prog[] = "resize2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -306,7 +306,7 @@ do_e2fsck_f (const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/e2fsck";
+  char prog[] = "e2fsck";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -334,7 +334,7 @@ do_mke2journal (int blocksize, const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -360,7 +360,7 @@ do_mke2journal_L (int blocksize, const char *label, const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -387,7 +387,7 @@ do_mke2journal_U (int blocksize, const char *uuid, const char *device)
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -415,7 +415,7 @@ do_mke2fs_J (const char *fstype, int blocksize, const char *device,
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -446,7 +446,7 @@ do_mke2fs_JL (const char *fstype, int blocksize, const char *device,
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
@@ -477,7 +477,7 @@ do_mke2fs_JU (const char *fstype, int blocksize, const char *device,
   char *err;
   int r;
 
-  char prog[] = "/sbin/mke2fs";
+  char prog[] = "mke2fs";
   if (e2prog (prog) == -1)
     return -1;
 
diff --git a/daemon/fsck.c b/daemon/fsck.c
index 932f1c57..e452adc0 100644
--- a/daemon/fsck.c
+++ b/daemon/fsck.c
@@ -32,7 +32,7 @@ do_fsck (const char *fstype, const char *device)
   char *err;
   int r;
 
-  r = commandr (NULL, &err, "/sbin/fsck", "-a", "-t", fstype, device, NULL);
+  r = commandr (NULL, &err, "fsck", "-a", "-t", fstype, device, NULL);
   if (r == -1) {
     reply_with_error ("%s: %s", device, err);
     free (err);
diff --git a/daemon/grub.c b/daemon/grub.c
index 579cc6b1..f394eefe 100644
--- a/daemon/grub.c
+++ b/daemon/grub.c
@@ -37,7 +37,7 @@ do_grub_install (const char *root, const char *device)
     return -1;
   }
 
-  r = command (NULL, &err, "/sbin/grub-install", buf, device, NULL);
+  r = command (NULL, &err, "grub-install", buf, device, NULL);
   free (buf);
 
   if (r == -1) {
diff --git a/daemon/guestfsd.c b/daemon/guestfsd.c
index 5265ab52..84b62ab5 100644
--- a/daemon/guestfsd.c
+++ b/daemon/guestfsd.c
@@ -220,8 +220,11 @@ main (int argc, char *argv[])
   /* Set up a basic environment.  After we are called by /init the
    * environment is essentially empty.
    * https://bugzilla.redhat.com/show_bug.cgi?id=502074#c5
+   *
+   * NOTE: if you change $PATH, you must also change 'prog_exists'
+   * function below.
    */
-  setenv ("PATH", "/usr/bin:/bin", 1);
+  setenv ("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
   setenv ("SHELL", "/bin/sh", 1);
   setenv ("LC_ALL", "C", 1);
 
@@ -1056,6 +1059,25 @@ device_name_translation (char *device, const char *func)
   goto error;
 }
 
+/* Check program exists and is executable on $PATH.  Actually, we
+ * just assume PATH contains the default entries (see main() above).
+ */
+int
+prog_exists (const char *prog)
+{
+  static const char *dirs[] =
+    { "/sbin", "/usr/sbin", "/bin", "/usr/bin" };
+  size_t i;
+  char buf[1024];
+
+  for (i = 0; i < sizeof dirs / sizeof dirs[0]; ++i) {
+    snprintf (buf, sizeof buf, "%s/%s", dirs[i], prog);
+    if (access (buf, X_OK) == 0)
+      return 1;
+  }
+  return 0;
+}
+
 /* LVM and other commands aren't synchronous, especially when udev is
  * involved.  eg. You can create or remove some device, but the /dev
  * device node won't appear until some time later.  This means that
@@ -1073,6 +1095,6 @@ device_name_translation (char *device, const char *func)
 void
 udev_settle (void)
 {
-  (void) command (NULL, NULL, "/sbin/udevadm", "settle", NULL);
-  (void) command (NULL, NULL, "/sbin/udevsettle", NULL);
+  (void) command (NULL, NULL, "udevadm", "settle", NULL);
+  (void) command (NULL, NULL, "udevsettle", NULL);
 }
diff --git a/daemon/lvm.c b/daemon/lvm.c
index 82cdf3fb..e4fa54e8 100644
--- a/daemon/lvm.c
+++ b/daemon/lvm.c
@@ -31,8 +31,7 @@
 int
 optgroup_lvm2_available (void)
 {
-  int r = access ("/sbin/lvm", X_OK);
-  return r == 0;
+  return prog_exists ("lvm");
 }
 
 /* LVM actions.  Keep an eye on liblvm, although at the time
@@ -101,7 +100,7 @@ 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);
@@ -121,7 +120,7 @@ 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);
@@ -141,7 +140,7 @@ 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) {
@@ -185,7 +184,7 @@ 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);
@@ -212,7 +211,7 @@ 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)
@@ -242,7 +241,7 @@ 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);
@@ -267,7 +266,7 @@ do_lvresize (const char *logvol, int mbytes)
   snprintf (size, sizeof size, "%d", mbytes);
 
   r = command (NULL, &err,
-               "/sbin/lvm", "lvresize",
+               "lvm", "lvresize",
                "-L", size, logvol, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);
@@ -295,7 +294,7 @@ 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);
@@ -312,7 +311,7 @@ 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);
@@ -329,7 +328,7 @@ 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);
@@ -353,7 +352,7 @@ 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);
@@ -374,7 +373,7 @@ 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);
@@ -395,7 +394,7 @@ 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);
@@ -416,7 +415,7 @@ 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 ("%s: %s", device, err);
     free (err);
@@ -441,7 +440,7 @@ 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";
@@ -476,7 +475,7 @@ do_lvrename (const char *logvol, const char *newlogvol)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "lvrename",
+               "lvm", "lvrename",
                logvol, newlogvol, NULL);
   if (r == -1) {
     reply_with_error ("%s -> %s: %s", logvol, newlogvol, err);
@@ -498,7 +497,7 @@ do_vgrename (const char *volgroup, const char *newvolgroup)
   int r;
 
   r = command (NULL, &err,
-               "/sbin/lvm", "vgrename",
+               "lvm", "vgrename",
                volgroup, newvolgroup, NULL);
   if (r == -1) {
     reply_with_error ("%s -> %s: %s", volgroup, newvolgroup, err);
@@ -519,7 +518,7 @@ get_lvm_field (const char *cmd, const char *field, const char *device)
   char *out;
   char *err;
   int r = command (&out, &err,
-                   "/sbin/lvm", cmd,
+                   "lvm", cmd,
                    "--unbuffered", "--noheadings", "-o", field,
                    device, NULL);
   if (r == -1) {
@@ -559,7 +558,7 @@ get_lvm_fields (const char *cmd, const char *field, const char *device)
   char *out;
   char *err;
   int r = command (&out, &err,
-                   "/sbin/lvm", cmd,
+                   "lvm", cmd,
                    "--unbuffered", "--noheadings", "-o", field,
                    device, NULL);
   if (r == -1) {
diff --git a/daemon/mkfs.c b/daemon/mkfs.c
index 2beb82ad..6735d24d 100644
--- a/daemon/mkfs.c
+++ b/daemon/mkfs.c
@@ -40,7 +40,7 @@ mkfs (const char *fstype, const char *device,
   int r;
   char *err;
 
-  argv[i++] = "/sbin/mkfs";
+  argv[i++] = "mkfs";
   argv[i++] = "-t";
   argv[i++] = fstype;
 
diff --git a/daemon/modprobe.c b/daemon/modprobe.c
index ac62b349..0d7318c3 100644
--- a/daemon/modprobe.c
+++ b/daemon/modprobe.c
@@ -28,15 +28,14 @@
 int
 optgroup_linuxmodules_available (void)
 {
-  int r = access ("/sbin/modprobe", X_OK);
-  return r == 0;
+  return prog_exists ("modprobe");
 }
 
 int
 do_modprobe (const char *module)
 {
   char *err;
-  int r = command (NULL, &err, "/sbin/modprobe", module, NULL);
+  int r = command (NULL, &err, "modprobe", module, NULL);
 
   if (r == -1) {
     reply_with_error ("%s", err);
diff --git a/daemon/parted.c b/daemon/parted.c
index 3b656bc2..99417c23 100644
--- a/daemon/parted.c
+++ b/daemon/parted.c
@@ -46,7 +46,7 @@ recover_blkrrpart (const char *device, const char *err)
                "Error informing the kernel about modifications to partition"))
     return -1;
 
-  r = command (NULL, NULL, "/sbin/blockdev", "--rereadpt", device, NULL);
+  r = command (NULL, NULL, "blockdev", "--rereadpt", device, NULL);
   if (r == -1)
     return -1;
 
@@ -61,7 +61,7 @@ recover_blkrrpart (const char *device, const char *err)
     char *err;                                                          \
                                                                         \
     r = commandf (NULL, &err, COMMAND_FLAG_FOLD_STDOUT_ON_STDERR,       \
-                  "/sbin/parted", "-s", "--", (device), __VA_ARGS__);   \
+                  "parted", "-s", "--", (device), __VA_ARGS__);   \
     if (r == -1) {                                                      \
       if (recover_blkrrpart ((device), err) == -1) {                    \
         reply_with_error ("%s: parted: %s: %s", __func__, (device), err); \
@@ -229,7 +229,7 @@ print_partition_table (const char *device)
   int r;
   char **lines;
 
-  r = command (&out, &err, "/sbin/parted", "-m", "--", device,
+  r = command (&out, &err, "parted", "-m", "--", device,
                "unit", "b",
                "print", NULL);
   if (r == -1) {
diff --git a/daemon/scrub.c b/daemon/scrub.c
index 08c6d47d..573385f0 100644
--- a/daemon/scrub.c
+++ b/daemon/scrub.c
@@ -31,8 +31,7 @@
 int
 optgroup_scrub_available (void)
 {
-  int r = access ("/usr/bin/scrub", X_OK);
-  return r == 0;
+  return prog_exists ("scrub");
 }
 
 int
diff --git a/daemon/sfdisk.c b/daemon/sfdisk.c
index 14297e7e..20d7dc82 100644
--- a/daemon/sfdisk.c
+++ b/daemon/sfdisk.c
@@ -38,7 +38,7 @@ sfdisk (const char *device, int n, int cyls, int heads, int sectors,
   char buf[256];
   int i;
 
-  strcpy (buf, "/sbin/sfdisk");
+  strcpy (buf, "sfdisk");
 
   if (n > 0)
     sprintf (buf + strlen (buf), " -N %d", n);
@@ -122,7 +122,7 @@ sfdisk_flag (const char *device, const char *flag)
   char *out, *err;
   int r;
 
-  r = command (&out, &err, "/sbin/sfdisk", flag, device, NULL);
+  r = command (&out, &err, "sfdisk", flag, device, NULL);
   if (r == -1) {
     reply_with_error ("%s: %s", device, err);
     free (out);
diff --git a/daemon/swap.c b/daemon/swap.c
index fbeb895f..67d553ae 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -39,7 +39,7 @@ optgroup_linuxfsuuid_available (void)
   int av;
 
   /* Ignore return code - mkswap --help *will* fail. */
-  command (NULL, &err, "/sbin/mkswap", "--help", NULL);
+  command (NULL, &err, "mkswap", "--help", NULL);
 
   av = strstr (err, "-U") != NULL;
   free (err);
@@ -53,9 +53,9 @@ mkswap (const char *device, const char *flag, const char *value)
   int r;
 
   if (!flag)
-    r = command (NULL, &err, "/sbin/mkswap", "-f", device, NULL);
+    r = command (NULL, &err, "mkswap", "-f", device, NULL);
   else
-    r = command (NULL, &err, "/sbin/mkswap", "-f", flag, value, device, NULL);
+    r = command (NULL, &err, "mkswap", "-f", flag, value, device, NULL);
 
   if (r == -1) {
     reply_with_error ("%s", err);
@@ -128,13 +128,13 @@ swaponoff (const char *cmd, const char *flag, const char *value)
 int
 do_swapon_device (const char *device)
 {
-  return swaponoff ("/sbin/swapon", NULL, device);
+  return swaponoff ("swapon", NULL, device);
 }
 
 int
 do_swapoff_device (const char *device)
 {
-  return swaponoff ("/sbin/swapoff", NULL, device);
+  return swaponoff ("swapoff", NULL, device);
 }
 
 int
@@ -149,7 +149,7 @@ do_swapon_file (const char *path)
     return -1;
   }
 
-  r = swaponoff ("/sbin/swapon", NULL, buf);
+  r = swaponoff ("swapon", NULL, buf);
   free (buf);
   return r;
 }
@@ -166,7 +166,7 @@ do_swapoff_file (const char *path)
     return -1;
   }
 
-  r = swaponoff ("/sbin/swapoff", NULL, buf);
+  r = swaponoff ("swapoff", NULL, buf);
   free (buf);
   return r;
 }
@@ -174,23 +174,23 @@ do_swapoff_file (const char *path)
 int
 do_swapon_label (const char *label)
 {
-  return swaponoff ("/sbin/swapon", "-L", label);
+  return swaponoff ("swapon", "-L", label);
 }
 
 int
 do_swapoff_label (const char *label)
 {
-  return swaponoff ("/sbin/swapoff", "-L", label);
+  return swaponoff ("swapoff", "-L", label);
 }
 
 int
 do_swapon_uuid (const char *uuid)
 {
-  return swaponoff ("/sbin/swapon", "-U", uuid);
+  return swaponoff ("swapon", "-U", uuid);
 }
 
 int
 do_swapoff_uuid (const char *uuid)
 {
-  return swaponoff ("/sbin/swapoff", "-U", uuid);
+  return swaponoff ("swapoff", "-U", uuid);
 }
diff --git a/daemon/zerofree.c b/daemon/zerofree.c
index 84073dd0..f98c69b1 100644
--- a/daemon/zerofree.c
+++ b/daemon/zerofree.c
@@ -31,8 +31,7 @@
 int
 optgroup_zerofree_available (void)
 {
-  int r = access ("/usr/sbin/zerofree", X_OK);
-  return r == 0;
+  return prog_exists ("zerofree");
 }
 
 int
@@ -41,7 +40,7 @@ do_zerofree (const char *device)
   char *err;
   int r;
 
-  r = command (NULL, &err, "/usr/sbin/zerofree", device, NULL);
+  r = command (NULL, &err, "zerofree", device, NULL);
   if (r == -1) {
     reply_with_error ("%s: %s", device, err);
     free (err);
diff --git a/src/generator.ml b/src/generator.ml
index b04bbe03..e9965212 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -6145,7 +6145,7 @@ and generate_daemon_actions () =
         pr "  ret->guestfs_int_lvm_%s_list_val = NULL;\n" typ;
         pr "\n";
         pr "  r = command (&out, &err,\n";
-        pr "	       \"/sbin/lvm\", \"%ss\",\n" typ;
+        pr "	       \"lvm\", \"%ss\",\n" typ;
         pr "	       \"-o\", lvm_%s_cols, \"--unbuffered\", \"--noheadings\",\n" typ;
         pr "	       \"--nosuffix\", \"--separator\", \",\", \"--units\", \"b\", NULL);\n";
         pr "  if (r == -1) {\n";