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builder.ml
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(* virt-builder
* Copyright (C) 2013-2023 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
open Common_gettext.Gettext
module G = Guestfs
open Std_utils
open Tools_utils
open Unix_utils
open Password
open Planner
open Utils
open Cmdline
open Customize_cmdline
open Unix
open Printf
let () = Random.self_init ()
let remove_duplicates index =
let compare_revisions rev1 rev2 =
match rev1, rev2 with
| Rev_int n1, Rev_int n2 -> compare n1 n2
| Rev_string s1, Rev_int n2 -> compare s1 (string_of_int n2)
| Rev_int n1, Rev_string s2 -> compare (string_of_int n1) s2
| Rev_string s1, Rev_string s2 -> compare s1 s2
in
(* Fill an hash with the higher revision of the available
* (name, arch) tuples, so it possible to ignore duplicates,
* and versions with a lower revision.
*)
let nseen = Hashtbl.create 13 in
List.iter (
fun (name, { Index.arch; revision }) ->
let id = name, arch in
try
let rev = Hashtbl.find nseen id in
if compare_revisions rev revision > 0 then
Hashtbl.replace nseen id revision
with Not_found ->
Hashtbl.add nseen id revision
) index;
List.filter (
fun (name, { Index.arch ; revision }) ->
let id = name, arch in
try
let rev = Hashtbl.find nseen (name, arch) in
(* Take the first occurrency with the higher revision,
* removing it from the hash so the other occurrencies
* are ignored.
*)
if revision = rev then (
Hashtbl.remove nseen id;
true
) else
false
with Not_found ->
(* Already taken, so ignore. *)
false
) index
(* Look for the specified os-version, resolving it as alias first. *)
let selected_cli_item cmdline index =
let arg =
(* Try to resolve the alias. *)
try
let item =
List.find (
fun (name, { Index.aliases }) ->
match aliases with
| None -> false
| Some l -> List.mem cmdline.arg l
) index in
fst item
with Not_found -> cmdline.arg in
let item =
try List.find (
fun (name, { Index.arch = a }) ->
name = arg && cmdline.arch = normalize_arch (Index.string_of_arch a)
) index
with Not_found ->
error (f_"cannot find os-version ‘%s’ with architecture ‘%s’.\n\
Use --list to list available guest types.")
arg cmdline.arch in
item
let main () =
(* Command line argument parsing - see cmdline.ml. *)
let cmdline = parse_cmdline () in
(* If debugging, echo the command line arguments and the sources. *)
if verbose () then (
printf "command line:";
List.iter (printf " %s") (Array.to_list Sys.argv);
print_newline ();
List.iteri (
fun i (source, fingerprint) ->
printf "source[%d] = (%S, %S)\n" i source fingerprint
) cmdline.sources
);
(* Handle some modes here, some later on. *)
let mode =
match cmdline.mode with
| `Get_kernel -> (* --get-kernel is really a different program ... *)
let cmd = [ "virt-get-kernel" ] @
(if verbose () then [ "--verbose" ] else []) @
(if trace () then [ "-x" ] else []) @
(match cmdline.format with
| None -> []
| Some format -> [ "--format"; format ]) @
(match cmdline.output with
| None -> []
| Some output -> [ "--output"; output ]) @
[ "--add"; cmdline.arg ] in
exit (run_command cmd)
| `Delete_cache -> (* --delete-cache *)
(match cmdline.cache with
| Some cachedir ->
message (f_"Deleting: %s") cachedir;
Cache.clean_cachedir cachedir;
exit 0
| None ->
error (f_"could not find cache directory. Is $HOME set?")
)
| (`Install|`List|`Notes|`Print_cache|`Cache_all) as mode -> mode in
(* Check various programs/dependencies are installed. *)
(* Check that gpg is installed. Optional as long as the user
* disables all signature checks.
*)
if cmdline.check_signature then (
let cmd = sprintf "%s --help >/dev/null 2>&1" cmdline.gpg in
if cmdline.gpg = "" || shell_command cmd <> 0 then
error (f_"no GNU Privacy Guard (GnuPG, gpg) binary was found.\n\n\
Either gpg v1 or v2 can be installed to check signatures. \
Virt-builder looks for a binary called either ‘gpg2’ or \
‘gpg‘ on the $PATH. You can also specify a binary using \
the ‘--gpg’ option. If you don't want to check signatures, \
use ’--no-check-signature’ but note that this may make you \
vulnerable to Man-In-The-Middle attacks.")
);
(* Check that curl works. *)
let cmd = sprintf "%s --help >/dev/null 2>&1" cmdline.curl in
if shell_command cmd <> 0 then
error (f_"curl is not installed (or does not work)");
(* Check that virt-resize works. *)
let cmd = "virt-resize --help >/dev/null 2>&1" in
if shell_command cmd <> 0 then
error (f_"virt-resize is not installed (or does not work)");
(* Create the cache. *)
let cache =
match cmdline.cache with
| None -> None
| Some dir ->
try Some (Cache.create ~directory:dir)
with exn ->
warning (f_"cache %s: %s") dir (Printexc.to_string exn);
warning (f_"disabling the cache");
None
in
(* Create a single temporary directory for all the small-or-so
* temporary files that Downloader, Sigchecker, etc, are going
* create.
*)
let tmpdir = Mkdtemp.temp_dir "virt-builder." in
On_exit.rm_rf tmpdir;
(* Download the sources. *)
let downloader = Downloader.create ~curl:cmdline.curl ~cache ~tmpdir in
let repos = Sources.read_sources () in
let sources = List.map (
fun (source, fingerprint) ->
{
Sources.name = source; uri = source;
gpgkey = Utils.Fingerprint fingerprint;
proxy = Curl.SystemProxy;
format = Sources.FormatNative;
}
) cmdline.sources in
let sources = List.append sources repos in
let index : Index.index =
List.concat (
List.map (
fun source ->
let sigchecker =
Sigchecker.create ~gpg:cmdline.gpg
~check_signature:cmdline.check_signature
~gpgkey:source.Sources.gpgkey
~tmpdir in
match source.Sources.format with
| Sources.FormatNative ->
Index_parser.get_index ~downloader ~sigchecker source
| Sources.FormatSimpleStreams ->
Simplestreams_parser.get_index ~downloader ~sigchecker source
) sources
) in
let index = remove_duplicates index in
(* Now handle the remaining modes. *)
let mode =
match mode with
| `List -> (* --list *)
let sources, index =
match cmdline.arg with
| "" -> sources, index (* no template -> all the available ones *)
| arg -> (* just the specified template *)
let item = selected_cli_item cmdline index in
[], [item] in
List_entries.list_entries ~list_format:cmdline.list_format ~sources index;
exit 0
| `Print_cache -> (* --print-cache *)
(match cache with
| Some cache ->
let l = List.filter (
fun (_, { Index.hidden }) ->
hidden <> true
) index in
let l = List.map (
fun (name, { Index.revision; arch }) ->
(name, arch, revision)
) l in
Cache.print_item_status cache ~header:true l
| None -> printf (f_"no cache directory\n")
);
exit 0
| `Cache_all -> (* --cache-all-templates *)
(match cache with
| None ->
error (f_"no cache directory")
| Some _ ->
List.iter (
fun (name,
{ Index.revision; file_uri; proxy; arch }) ->
let template = name, arch, revision in
message (f_"Downloading: %s") file_uri;
let progress_bar = not (quiet ()) in
ignore (Downloader.download downloader ~template ~progress_bar
~proxy file_uri)
) index;
exit 0
);
| (`Install|`Notes) as mode -> mode in
(* Which os-version (ie. index entry)? *)
let item = selected_cli_item cmdline index in
let arg = fst item in
let entry = snd item in
let sigchecker = entry.Index.sigchecker in
(match mode with
| `Notes -> (* --notes *)
let notes =
Languages.find_notes (Languages.languages ()) entry.Index.notes in
(match notes with
| notes :: _ ->
print_endline notes
| [] ->
printf (f_"There are no notes for %s\n") arg
);
exit 0
| `Install ->
() (* fall through to create the guest *)
);
(* --- If we get here, we want to create a guest. --- *)
(* Warn if the user might be writing to a partition on a USB key. *)
(match cmdline.output with
| Some device when is_partition device ->
if cmdline.warn_if_partition then
warning (f_"output device (%s) is a partition. If you are writing \
to a USB key or external drive then you probably need \
to write to the whole device, not to a partition. If \
this warning is wrong then you can disable it with \
--no-warn-if-partition")
device;
| Some _ | None -> ()
);
(* Download the template, or it may be in the cache. *)
let template =
let template, delete_on_exit =
let { Index.revision; file_uri; proxy } = entry in
let template = arg, Index.Arch cmdline.arch, revision in
message (f_"Downloading: %s") file_uri;
let progress_bar = not (quiet ()) in
Downloader.download downloader ~template ~progress_bar ~proxy
file_uri in
if delete_on_exit then On_exit.unlink template;
template in
(* Check the signature of the file. *)
let () =
match entry with
(* New-style: Using a checksum. *)
| { Index.checksums = Some csums } ->
(match Checksums.verify_checksums csums template with
| Checksums.Good_checksum -> ()
| Checksums.Mismatched_checksum (csum, csum_actual) ->
error (f_"%s checksum of template did not match the expected \
checksum!\n found checksum: %s\n expected checksum: %s\n\
Try:\n - Use the ‘-v’ option and look for earlier error \
messages.\n - Delete the cache: \
virt-builder --delete-cache\n - Check no one has tampered \
with the website or your network!")
(Checksums.string_of_csum_t csum) csum_actual
(Checksums.string_of_csum csum)
| Checksums.Missing_file ->
error (f_"%s: template not downloaded or deleted. You may have \
run ‘virt-builder --delete-cache’ in parallel.")
template
)
| { Index.checksums = None } ->
(* Old-style: detached signature. *)
let sigfile =
match entry with
| { Index.signature_uri = None } -> None
| { Index.signature_uri = Some signature_uri } ->
let sigfile, delete_on_exit =
Downloader.download downloader signature_uri in
if delete_on_exit then On_exit.unlink sigfile;
Some sigfile in
Sigchecker.verify_detached sigchecker template sigfile in
(* For an explanation of the Planner, see:
* http://rwmj.wordpress.com/2013/12/14/writing-a-planner-to-solve-a-tricky-programming-optimization-problem/
*)
(* Planner: Input tags. *)
let itags =
let { Index.size; format } = entry in
let format_tag =
match format with
| None -> []
| Some format -> [`Format, format] in
let compression_tag =
match detect_file_type template with
| `XZ -> [ `XZ, "" ]
| `GZip | `Tar | `Zip ->
error (f_"input file (%s) has an unsupported type") template
| `Unknown -> [] in
[ `Template, ""; `Filename, template; `Size, Int64.to_string size ] @
format_tag @ compression_tag in
(* Planner: Goal. *)
let output_filename, output_format =
match cmdline.output, cmdline.format with
| None, None -> sprintf "%s.img" arg, "raw"
| None, Some "raw" -> sprintf "%s.img" arg, "raw"
| None, Some format -> sprintf "%s.%s" arg format, format
| Some output, None -> output, "raw"
| Some output, Some format -> output, format in
if is_char_device output_filename then
error (f_"cannot output to a character device or /dev/null");
let blockdev_getsize64 dev =
let cmd = sprintf "blockdev --getsize64 %s" (quote dev) in
let lines = external_command cmd in
assert (List.length lines >= 1);
Int64.of_string (List.hd lines)
in
let output_is_block_dev, blockdev_size =
let b = is_block_device output_filename in
let sz = if b then blockdev_getsize64 output_filename else 0L in
b, sz in
let output_size =
let { Index.size = original_image_size } = entry in
let size =
match cmdline.size with
| Some size -> size
(* --size parameter missing, output to file: use original image size *)
| None when not output_is_block_dev -> original_image_size
(* --size parameter missing, block device: use block device size *)
| None -> blockdev_size in
if size < original_image_size then
error (f_"images cannot be shrunk, the output size is too small \
for this image. Requested size = %s, minimum size = %s")
(human_size size) (human_size original_image_size)
else if output_is_block_dev &&
output_format = "raw" && size > blockdev_size then
error (f_"output size is too large for this block device. Requested \
size = %s, output block device = %s, output \
block device size = %s")
(human_size size) output_filename (human_size blockdev_size);
size in
(* Goal: must *)
let must = [
`Filename, output_filename;
`Size, Int64.to_string output_size;
`Format, output_format
] in
(* Goal: must not *)
let must_not = [ `Template, ""; `XZ, "" ] in
let cache_dir = (open_guestfs ())#get_cachedir () in
(* Planner: Transitions. *)
let transitions itags =
let is t = List.mem_assoc t itags in
let is_not t = not (is t) in
let remove = List.remove_assoc in
let ret = ref [] in
let infile = List.assoc `Filename itags in
(* The scheme for weights ranges from 0 = free to 100 = most expensive:
*
* 0 = free operations like renaming a file in the same directory
* 10 = in-place conversions (like [qemu-img resize])
* 20 = copy or move a file between two local filesystems
* 30 = copy and convert a file between two local filesystems
* 40 = copy a file within the same local filesystem
* 50 = copy and convert a file within the same local filesystem
* 80 = copy, move, convert if source or target is on network filesystem
* 100 = complex operations like virt-resize
*
* Copies and moves across different local filesystems are
* cheaper than copies within the same filesystem. The
* theory because less bandwith is available if both source
* and destination hit the same device (except in the special
* case of moving within a filesystem which is free).
*
* We could estimate weights better by looking at file sizes.
*)
let weight task otags =
let outfile = List.assoc `Filename otags in
(* If infile/outfile don't exist, get the containing directory. *)
let infile =
if Sys.file_exists infile then infile else Filename.dirname infile in
let outfile =
if Sys.file_exists outfile then outfile else Filename.dirname outfile in
match task with
| `Virt_resize -> 100 (* virt-resize is a special case*)
| (`Copy|`Move|`Pxzcat|`Disk_resize|`Convert) as task ->
if StatVFS.is_network_filesystem infile ||
StatVFS.is_network_filesystem outfile
then 80 (* NFS etc. *)
else (
let across = (lstat infile).st_dev <> (lstat outfile).st_dev in
match task, across with
| `Move, false -> 0 (* rename in same filesystem *)
| `Disk_resize, _ -> 10 (* in-place conversion *)
| `Move, true (* move or copy between two filesystems *)
| `Copy, true -> 20
| (`Pxzcat|`Convert), true -> 30 (* convert between two local fses*)
| `Copy, false -> 40 (* copy within same filesystem *)
| (`Pxzcat|`Convert), false -> 50 (* convert with same local fs*)
)
in
(* Add a transition to the returned list. *)
let tr task otags = List.push_front (task, weight task otags, otags) ret in
(* Since the final plan won't run in parallel, we don't only need
* to choose unique tempfiles per transition, so this is OK:
*)
let tempfile = Filename.temp_file ~temp_dir:cache_dir "vb" ".img" in
On_exit.unlink tempfile;
(* Always possible to copy from one place to another. The only
* thing a copy does is to remove the template tag (since it's always
* copied out of the cache directory).
*)
if infile <> output_filename then
tr `Copy ((`Filename, output_filename) :: remove `Template itags);
tr `Copy ((`Filename, tempfile) :: remove `Template itags);
(* We can rename a file instead of copying, but don't rename the
* cache copy!
*)
if is_not `Template then (
if not output_is_block_dev && infile <> output_filename then
tr `Move ((`Filename, output_filename) :: itags);
tr `Move ((`Filename, tempfile) :: itags)
);
if is `XZ then (
(* If the input is XZ-compressed, then we can run xzcat, either
* to the output file or to a temp file.
*)
if not output_is_block_dev && infile <> output_filename then
tr `Pxzcat
((`Filename, output_filename) :: remove `XZ (remove `Template itags));
tr `Pxzcat
((`Filename, tempfile) :: remove `XZ (remove `Template itags));
)
else (
(* If the input is NOT compressed then we could run virt-resize
* if it makes sense to resize the image. Note that virt-resize
* can do both size and format conversions.
*)
let old_size = Int64.of_string (List.assoc `Size itags) in
let headroom = 256L *^ 1024L *^ 1024L in
if output_size >= old_size +^ headroom then (
if infile <> output_filename then
tr `Virt_resize
((`Size, Int64.to_string output_size) ::
(`Filename, output_filename) ::
(`Format, output_format) :: (remove `Template itags));
tr `Virt_resize
((`Size, Int64.to_string output_size) ::
(`Filename, tempfile) ::
(`Format, output_format) :: (remove `Template itags))
)
(* If the size increase is smaller than the amount of headroom
* inside the disk image, then virt-resize won't work. However
* we can do a disk resize (using 'qemu-img resize') instead,
* although it won't resize the filesystems for the user.
*
* 'qemu-img resize' works on the file in-place and won't change
* the format. It must not be run on a template directly.
*
* Don't run 'qemu-img resize' on an auto format. This is to
* force an explicit conversion step to a real format.
*)
else if output_size > old_size && is_not `Template
&& List.mem_assoc `Format itags then
tr `Disk_resize ((`Size, Int64.to_string output_size) :: itags);
(* qemu-img convert is always possible, and quicker. It doesn't
* resize, but it does change the format.
*)
if infile <> output_filename then
tr `Convert
((`Filename, output_filename) :: (`Format, output_format) ::
(remove `Template itags));
tr `Convert
((`Filename, tempfile) :: (`Format, output_format) ::
(remove `Template itags));
);
(* Return the list of possible transitions. *)
!ret
in
(* Plan how to create the disk image. *)
message (f_"Planning how to build this image");
let plan =
match plan ~max_depth:5 transitions itags ~must ~must_not with
| Some plan -> plan
| None ->
error (f_"no plan could be found for making a disk image with\n\
the required size, format etc. \
This is a bug in libguestfs!\nPlease file a bug, giving \
the command line arguments you used.") in
(* Print out the plan. *)
if verbose () then (
let print_tags tags =
(try
let v = List.assoc `Filename tags in printf " +filename=%s" v
with Not_found -> ());
(try
let v = List.assoc `Size tags in printf " +size=%s" v
with Not_found -> ());
(try
let v = List.assoc `Format tags in printf " +format=%s" v
with Not_found -> ());
if List.mem_assoc `Template tags then printf " +template";
if List.mem_assoc `XZ tags then printf " +xz"
in
let print_task = function
| `Copy -> printf "cp"
| `Move -> printf "mv"
| `Pxzcat -> printf "pxzcat"
| `Virt_resize -> printf "virt-resize"
| `Disk_resize -> printf "qemu-img resize"
| `Convert -> printf "qemu-img convert"
in
List.iteri (
fun i (itags, task, otags) ->
printf "%d: itags:" i;
print_tags itags;
printf "\n";
printf "%d: task : " i;
print_task task;
printf "\n";
printf "%d: otags:" i;
print_tags otags;
printf "\n\n%!"
) plan
);
(* Delete the output file before we finish. However don't delete it
* if it's block device, or if --no-delete-on-failure is set.
*)
let delete_output_file =
ref (cmdline.delete_on_failure && not output_is_block_dev) in
let delete_file () =
if !delete_output_file then
try unlink output_filename with _ -> ()
in
at_exit delete_file;
(* Carry out the plan. *)
List.iter (
function
| itags, `Copy, otags ->
let ifile = List.assoc `Filename itags in
let ofile = List.assoc `Filename otags in
message (f_"Copying");
let cmd = [ "cp"; ifile; ofile ] in
if run_command cmd <> 0 then exit 1
| itags, `Move, otags ->
let ifile = List.assoc `Filename itags in
let ofile = List.assoc `Filename otags in
let cmd = [ "mv"; ifile; ofile ] in
if run_command cmd <> 0 then exit 1
| itags, `Pxzcat, otags ->
let ifile = List.assoc `Filename itags in
let ofile = List.assoc `Filename otags in
message (f_"Uncompressing");
Pxzcat.pxzcat ifile ofile
| itags, `Virt_resize, otags ->
let ifile = List.assoc `Filename itags in
let iformat =
try Some (List.assoc `Format itags) with Not_found -> None in
let ofile = List.assoc `Filename otags in
let osize = Int64.of_string (List.assoc `Size otags) in
let osize = roundup64 osize 512L in
let oformat = List.assoc `Format otags in
let { Index.expand; lvexpand } = entry in
message (f_"Resizing (using virt-resize) to expand the disk to %s")
(human_size osize);
let preallocation =
if oformat = "qcow2" then Some "metadata" else None in
let () =
let g = open_guestfs () in
g#disk_create ?preallocation ofile oformat osize in
let cmd = [ "virt-resize" ] @
(if verbose () then [ "--verbose" ] else [ "--quiet" ]) @
(if is_block_device ofile then [ "--no-sparse" ] else []) @
(match iformat with
| None -> []
| Some iformat -> [ "--format"; iformat ]) @
[ "--output-format"; oformat ] @
(match expand with
| None -> []
| Some expand -> [ "--expand"; expand ]) @
(match lvexpand with
| None -> []
| Some lvexpand -> [ "--lv-expand"; lvexpand ]) @
[ "--unknown-filesystems"; "error"; ifile; ofile ] in
if run_command cmd <> 0 then exit 1
| itags, `Disk_resize, otags ->
let ofile = List.assoc `Filename otags in
let osize = Int64.of_string (List.assoc `Size otags) in
let osize = roundup64 osize 512L in
message (f_"Resizing container (but not filesystems) to \
expand the disk to %s")
(human_size osize);
let cmd = sprintf "qemu-img resize %s %Ld%s"
(quote ofile) osize (if verbose () then "" else " >/dev/null") in
if shell_command cmd <> 0 then exit 1
| itags, `Convert, otags ->
let ifile = List.assoc `Filename itags in
let iformat =
try Some (List.assoc `Format itags) with Not_found -> None in
let ofile = List.assoc `Filename otags in
let oformat = List.assoc `Format otags in
(match iformat with
| None -> message (f_"Converting to %s") oformat
| Some f -> message (f_"Converting %s to %s") f oformat
);
let cmd = sprintf "qemu-img convert%s %s -O %s %s%s"
(match iformat with
| None -> ""
| Some iformat -> sprintf " -f %s" (quote iformat))
(quote ifile) (quote oformat) (quote (qemu_input_filename ofile))
(if verbose () then "" else " >/dev/null 2>&1") in
if shell_command cmd <> 0 then exit 1
) plan;
(* Now mount the output disk so we can make changes. *)
message (f_"Opening the new disk");
let g =
let g = open_guestfs () in
Option.iter g#set_memsize cmdline.memsize;
Option.iter g#set_smp cmdline.smp;
g#set_network cmdline.network;
(* The output disk is being created, so use cache=unsafe here. *)
g#add_drive_opts ~format:output_format ~cachemode:"unsafe" output_filename;
(* Attach ISOs, if we have any. *)
List.iter (
fun (format, file) ->
g#add_drive_opts ?format ~readonly:true file;
) cmdline.attach;
g#launch ();
g in
(* Inspect the disk and mount it up. *)
let root =
match Array.to_list (g#inspect_os ()) with
| [root] ->
inspect_mount_root g root;
root
| _ ->
error (f_"no guest operating systems or multiboot OS \
found in this disk image\nThis is a failure \
of the source repository. Use -v for more information.")
in
Customize_run.run g root cmdline.customize_ops;
(* Collect some stats about the final output file.
* Notes:
* - These are virtual disk stats.
* - Never fail here.
*)
let stats =
if not (quiet ()) then (
try
(* Calculate the free space (in bytes) across all mounted
* filesystems in the guest.
*)
let free_bytes, total_bytes =
let filesystems = List.map snd (g#mountpoints ()) in
let stats = List.map g#statvfs filesystems in
let stats = List.map (
fun { G.bfree; bsize; blocks } ->
bfree *^ bsize, blocks *^ bsize
) stats in
List.fold_left (
fun (f,t) (f',t') -> f +^ f', t +^ t'
) (0L, 0L) stats in
let free_percent = 100L *^ free_bytes /^ total_bytes in
Some (
String.concat "\n" [
sprintf "%30s: %s" (s_"Output file") output_filename;
sprintf "%30s: %s" (s_"Output size") (human_size output_size);
sprintf "%30s: %s" (s_"Output format") output_format;
sprintf "%30s: %s" (s_"Total usable space")
(human_size total_bytes);
sprintf "%30s: %s (%Ld%%)" (s_"Free space")
(human_size free_bytes) free_percent;
] ^ "\n"
)
with
_ -> None
)
else None in
(* Unmount everything and we're done! *)
message (f_"Finishing off");
g#umount_all ();
g#shutdown ();
g#close ();
(* Because we used cache=unsafe when writing the output file, the
* file might not be committed to disk. This is a problem if qemu is
* immediately used afterwards with cache=none (which uses O_DIRECT
* and therefore bypasses the host cache). In general you should not
* use cache=none.
*)
if cmdline.sync then
Fsync.file output_filename;
(* Now that we've finished the build, don't delete the output file on
* exit.
*)
delete_output_file := false;
(* Print the stats calculated above. *)
Stdlib.flush Stdlib.stdout;
Stdlib.flush Stdlib.stderr;
Option.iter print_string stats
let () = run_main_and_handle_errors main