diff options
| -rw-r--r-- | daemon/lvm.c | 88 | ||||
| -rw-r--r-- | generator/generator_actions.ml | 10 | ||||
| -rw-r--r-- | src/MAX_PROC_NR | 2 |
3 files changed, 99 insertions, 1 deletions
diff --git a/daemon/lvm.c b/daemon/lvm.c index 9103a33d..06fdbff0 100644 --- a/daemon/lvm.c +++ b/daemon/lvm.c @@ -23,6 +23,7 @@ #include <inttypes.h> #include <string.h> #include <unistd.h> +#include <fcntl.h> #include <sys/stat.h> #include <dirent.h> @@ -872,3 +873,90 @@ do_list_dm_devices (void) return ret.argv; } + +char * +do_vgmeta (const char *vg, size_t *size_r) +{ + char *err; + int fd, r; + char tmp[] = "/tmp/vgmetaXXXXXX"; + size_t alloc, size, max; + ssize_t rs; + char *buf, *buf2; + + /* Make a temporary file. */ + fd = mkstemp (tmp); + if (fd == -1) { + reply_with_perror ("mkstemp"); + return NULL; + } + + close (fd); + + r = command (NULL, &err, "lvm", "vgcfgbackup", "-f", tmp, vg, NULL); + if (r == -1) { + reply_with_error ("vgcfgbackup: %s", err); + free (err); + return NULL; + } + free (err); + + /* Now read back the temporary file. */ + fd = open (tmp, O_RDONLY|O_CLOEXEC); + if (fd == -1) { + reply_with_error ("%s", tmp); + return NULL; + } + + /* Read up to GUESTFS_MESSAGE_MAX - <overhead> bytes. If it's + * larger than that, we need to return an error instead (for + * correctness). + */ + max = GUESTFS_MESSAGE_MAX - 1000; + buf = NULL; + size = alloc = 0; + + for (;;) { + if (size >= alloc) { + alloc += 8192; + if (alloc > max) { + reply_with_error ("metadata is too large for message buffer"); + free (buf); + close (fd); + return NULL; + } + buf2 = realloc (buf, alloc); + if (buf2 == NULL) { + reply_with_perror ("realloc"); + free (buf); + close (fd); + return NULL; + } + buf = buf2; + } + + rs = read (fd, buf + size, alloc - size); + if (rs == -1) { + reply_with_perror ("read: %s", tmp); + free (buf); + close (fd); + return NULL; + } + if (rs == 0) + break; + if (rs > 0) + size += rs; + } + + if (close (fd) == -1) { + reply_with_perror ("close: %s", tmp); + free (buf); + return NULL; + } + + unlink (tmp); + + *size_r = size; + + return buf; /* caller will free */ +} diff --git a/generator/generator_actions.ml b/generator/generator_actions.ml index a2710080..8c074ca9 100644 --- a/generator/generator_actions.ml +++ b/generator/generator_actions.ml @@ -6812,6 +6812,16 @@ Note that in the common case where you have added an ISO file as a libguestfs device, you would I<not> call this. Instead you would call C<guestfs_isoinfo_device>."); + ("vgmeta", (RBufferOut "metadata", [String "vgname"], []), 315, [Optional "lvm2"], + [], + "get volume group metadata", + "\ +C<vgname> is an LVM volume group. This command examines the +volume group and returns its metadata. + +Note that the metadata is an internal structure used by LVM, +subject to change at any time, and is provided for information only."); + ] let all_functions = non_daemon_functions @ daemon_functions diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR index 9346fabb..66953656 100644 --- a/src/MAX_PROC_NR +++ b/src/MAX_PROC_NR @@ -1 +1 @@ -314 +315 |