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/* Example showing how to create a disk image. */
package main
import (
"fmt"
"libguestfs.org/guestfs"
)
func main() {
output := "disk.img"
g, errno := guestfs.Create ()
if errno != nil {
panic (errno)
}
defer g.Close ()
/* Create a raw-format sparse disk image, 512 MB in size. */
if err := g.Disk_create (output, "raw", 512 * 1024 * 1024); err != nil {
panic (err)
}
/* Set the trace flag so that we can see each libguestfs call. */
g.Set_trace (true)
/* Attach the disk image to libguestfs. */
optargs := guestfs.OptargsAdd_drive{
Format_is_set: true,
Format: "raw",
Readonly_is_set: true,
Readonly: false,
}
if err := g.Add_drive (output, &optargs); err != nil {
panic (err)
}
/* Run the libguestfs back-end. */
if err := g.Launch (); err != nil {
panic (err)
}
/* Get the list of devices. Because we only added one drive
* above, we expect that this list should contain a single
* element.
*/
devices, err := g.List_devices ()
if err != nil {
panic (err)
}
if len(devices) != 1 {
panic ("expected a single device from list-devices")
}
/* Partition the disk as one single MBR partition. */
err = g.Part_disk (devices[0], "mbr")
if err != nil {
panic (err)
}
/* Get the list of partitions. We expect a single element, which
* is the partition we have just created.
*/
partitions, err := g.List_partitions ()
if err != nil {
panic (err)
}
if len(partitions) != 1 {
panic ("expected a single partition from list-partitions")
}
/* Create a filesystem on the partition. */
err = g.Mkfs ("ext4", partitions[0], nil)
if err != nil {
panic (err)
}
/* Now mount the filesystem so that we can add files. */
err = g.Mount (partitions[0], "/")
if err != nil {
panic (err)
}
/* Create some files and directories. */
err = g.Touch ("/empty")
if err != nil {
panic (err)
}
message := []byte("Hello, world\n")
err = g.Write ("/hello", message)
if err != nil {
panic (err)
}
err = g.Mkdir ("/foo")
if err != nil {
panic (err)
}
/* This one uploads the local file /etc/resolv.conf into
* the disk image.
*/
err = g.Upload ("/etc/resolv.conf", "/foo/resolv.conf")
if err != nil {
panic (err)
}
/* Because we wrote to the disk and we want to detect write
* errors, call g:shutdown. You don't need to do this:
* g.Close will do it implicitly.
*/
if err = g.Shutdown (); err != nil {
panic (fmt.Sprintf ("write to disk failed: %s", err))
}
}
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