[Libguestfs] [PATCH v6 10/10] Add a virt-builder-repository tool

virt-builder-repository allows users to easily create or update a virt-builder source repository out of disk images. The tool can be run in either interactive or automated mode. --- .gitignore | 3 + builder/Makefile.am | 84 +++++- builder/repository_main.ml | 570 ++++++++++++++++++++++++++++++++++++ builder/test-docs.sh | 2 + builder/virt-builder-repository.pod | 209 +++++++++++++ 5 files changed, 865 insertions(+), 3 deletions(-) create mode 100644 builder/repository_main.ml create mode 100644 builder/virt-builder-repository.pod diff --git a/.gitignore b/.gitignore index 4f04f8451..4b7e44126 100644 --- a/.gitignore +++ b/.gitignore @@ -96,13 +96,16 @@ Makefile.in /builder/oUnit-* /builder/*.qcow2 /builder/stamp-virt-builder.pod +/builder/stamp-virt-builder-repository.pod /builder/stamp-virt-index-validate.pod /builder/test-config/virt-builder/repos.d/test-index.conf /builder/test-console-*.sh /builder/test-simplestreams/virt-builder/repos.d/cirros.conf /builder/test-website/virt-builder/repos.d/libguestfs.conf /builder/virt-builder +/builder/virt-builder-repository /builder/virt-builder.1 +/builder/virt-builder-repository.1 /builder/virt-index-validate /builder/virt-index-validate.1 /builder/*.xz diff --git a/builder/Makefile.am b/builder/Makefile.am index bf4ccb7d7..df09c3f3d 100644 --- a/builder/Makefile.am +++ b/builder/Makefile.am @@ -21,6 +21,8 @@ AM_YFLAGS = -d EXTRA_DIST = \ $(SOURCES_MLI) $(SOURCES_ML) $(SOURCES_C) \ + $(REPOSITORY_SOURCES_ML) \ + $(REPOSITORY_SOURCES_MLI) \ libguestfs.gpg \ opensuse.gpg \ test-console.sh \ @@ -38,6 +40,7 @@ EXTRA_DIST = \ test-virt-index-validate-good-2 \ test-virt-index-validate-good-3 \ virt-builder.pod \ + virt-builder-repository.pod \ virt-index-validate.pod \ yajl_tests.ml @@ -85,13 +88,44 @@ SOURCES_C = \ setlocale-c.c \ yajl-c.c +REPOSITORY_SOURCES_ML = \ + utils.ml \ + index.ml \ + cache.ml \ + downloader.ml \ + sigchecker.ml \ + ini_reader.ml \ + index_parser.ml \ + yajl.ml \ + paths.ml \ + sources.ml \ + repository_main.ml + +REPOSITORY_SOURCES_MLI = \ + cache.mli \ + downloader.mli \ + index.mli \ + index_parser.mli \ + ini_reader.mli \ + sigchecker.mli \ + sources.mli \ + yajl.mli + +REPOSITORY_SOURCES_C = \ + index-scan.c \ + index-struct.c \ + index-parse.c \ + index-parser-c.c \ + yajl-c.c + + man_MANS = noinst_DATA = bin_PROGRAMS = if HAVE_OCAML -bin_PROGRAMS += virt-builder +bin_PROGRAMS += virt-builder virt-builder-repository virt_builder_SOURCES = $(SOURCES_C) virt_builder_CPPFLAGS = \ @@ -101,8 +135,7 @@ virt_builder_CPPFLAGS = \ -I$(shell $(OCAMLC) -where) \ -I$(top_srcdir)/gnulib/lib \ -I$(top_srcdir)/common/utils \ - -I$(top_srcdir)/lib \ - -I$(top_srcdir)/fish + -I$(top_srcdir)/lib virt_builder_CFLAGS = \ -pthread \ $(WARN_CFLAGS) $(WERROR_CFLAGS) \ @@ -115,6 +148,26 @@ virt_builder_CFLAGS = \ BOBJECTS = $(SOURCES_ML:.ml=.cmo) XOBJECTS = $(BOBJECTS:.cmo=.cmx) +virt_builder_repository_SOURCES = $(REPOSITORY_SOURCES_C) +virt_builder_repository_CPPFLAGS = \ + -I. \ + -I$(top_builddir) \ + -I$(top_srcdir)/gnulib/lib -I$(top_builddir)/gnulib/lib \ + -I$(shell $(OCAMLC) -where) \ + -I$(top_srcdir)/gnulib/lib \ + -I$(top_srcdir)/lib \ + -I$(top_srcdir)/fish +virt_builder_repository_CFLAGS = \ + -pthread \ + $(WARN_CFLAGS) $(WERROR_CFLAGS) \ + -Wno-unused-macros \ + $(LIBLZMA_CFLAGS) \ + $(LIBTINFO_CFLAGS) \ + $(LIBXML2_CFLAGS) \ + $(YAJL_CFLAGS) +REPOSITORY_BOBJECTS = $(REPOSITORY_SOURCES_ML:.ml=.cmo) +REPOSITORY_XOBJECTS = $(REPOSITORY_BOBJECTS:.cmo=.cmx) + # -I $(top_builddir)/lib/.libs is a hack which forces corresponding -L # option to be passed to gcc, so we don't try linking against an # installed copy of libguestfs. @@ -149,8 +202,10 @@ OCAMLFLAGS = $(OCAML_FLAGS) $(OCAML_WARN_ERROR) if !HAVE_OCAMLOPT OBJECTS = $(BOBJECTS) +REPOSITORY_OBJECTS = $(REPOSITORY_BOBJECTS) else OBJECTS = $(XOBJECTS) +REPOSITORY_OBJECTS = $(REPOSITORY_XOBJECTS) endif OCAMLLINKFLAGS = mlguestfs.$(MLARCHIVE) mllib.$(MLARCHIVE) customize.$(MLARCHIVE) $(LINK_CUSTOM_OCAMLC_ONLY) @@ -165,6 +220,15 @@ virt_builder_LINK = \ $(OCAMLFIND) $(BEST) $(OCAMLFLAGS) $(OCAMLPACKAGES) $(OCAMLLINKFLAGS) \ $(OBJECTS) -o $@ +virt_builder_repository_DEPENDENCIES = \ + $(REPOSITORY_OBJECTS) \ + ../mllib/mllib.$(MLARCHIVE) \ + $(top_srcdir)/ocaml-link.sh +virt_builder_repository_LINK = \ + $(top_srcdir)/ocaml-link.sh -cclib '$(OCAMLCLIBS)' -- \ + $(OCAMLFIND) $(BEST) $(OCAMLFLAGS) $(OCAMLPACKAGES) $(OCAMLLINKFLAGS) \ + $(REPOSITORY_OBJECTS) -o $@ + # Manual pages and HTML files for the website. man_MANS += virt-builder.1 @@ -183,6 +247,20 @@ stamp-virt-builder.pod: virt-builder.pod $(top_srcdir)/customize/customize-synop $< touch $@ +man_MANS += virt-builder-repository.1 +noinst_DATA += $(top_builddir)/website/virt-builder-repository.1.html + +virt-builder-repository.1 $(top_builddir)/website/virt-builder-repository.1.html: stamp-virt-builder-repository.pod + +stamp-virt-builder-repository.pod: virt-builder-repository.pod + $(PODWRAPPER) \ + --man virt-builder-repository.1 \ + --html $(top_builddir)/website/virt-builder-repository.1.html \ + --license GPLv2+ \ + --warning safe \ + $< + touch $@ + # Tests. TESTS_ENVIRONMENT = $(top_builddir)/run --test diff --git a/builder/repository_main.ml b/builder/repository_main.ml new file mode 100644 index 000000000..6806221c3 --- /dev/null +++ b/builder/repository_main.ml @@ -0,0 +1,570 @@ +(* virt-builder + * Copyright (C) 2016-2017 SUSE 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 +open Common_utils +open Unix_utils +open Getopt.OptionName +open Utils +open Yajl +open Xpath_helpers + +open Printf + +module StringSet = Set.Make(String) + +type cmdline = { + gpg : string; + gpgkey : string option; + interactive : bool; + keep_unsigned : bool; + no_compression : bool; + repo : string; +} + +type disk_image_info = { + format : string; + size : int64; +} + +let parse_cmdline () = + let gpg = ref "gpg" in + let gpgkey = ref "" in + let interactive = ref false in + let keep_unsigned = ref false in + let no_compression = ref false in + let machine_readable = ref false in + + let argspec = [ + [ L"gpg" ], Getopt.Set_string ("gpg", gpg), s_"Set GPG binary/command"; + [ S 'K'; L"gpg-key" ], Getopt.Set_string ("gpgkey", gpgkey), + s_"ID of the GPG key to sign the repo with"; + [ S 'i'; L"interactive" ], Getopt.Set interactive, s_"Ask the user about missing data"; + [ L"keep-index" ], Getopt.Set keep_unsigned, s_"Keep unsigned index"; + [ L"no-compression" ], Getopt.Set no_compression, s_"Don't compress the new images in the index"; + [ L"machine-readable" ], Getopt.Set machine_readable, s_"Make output machine readable"; + ] in + + let args = ref [] in + let anon_fun s = push_front s args in + let usage_msg = + sprintf (f_"\ +%s: create a repository for virt-builder + + virt-builder-repository REPOSITORY_PATH + +A short summary of the options is given below. For detailed help please +read the man page virt-builder-repository(1). +") + prog in + let opthandle = create_standard_options argspec ~anon_fun usage_msg in + Getopt.parse opthandle; + + (* Machine-readable mode? Print out some facts about what + * this binary supports. + *) + if !machine_readable then ( + printf "virt-builder-repository\n"; + exit 0 + ); + + (* Dereference options. *) + let args = List.rev !args in + let gpg = !gpg in + let gpgkey = match !gpgkey with "" -> None | s -> Some s in + let interactive = !interactive in + let keep_unsigned = !keep_unsigned in + let no_compression = !no_compression in + + (* Check options *) + let repo = + match args with + | [repo] -> repo + | [] -> + error (f_"virt-builder-repository /path/to/repo\nUse '/path/to/repo' to point to the repository folder.") + | _ -> + error (f_"too many parameters, only one path to repository is allowed") in + + { + gpg = gpg; + gpgkey = gpgkey; + interactive = interactive; + keep_unsigned = keep_unsigned; + no_compression = no_compression; + repo = repo; + } + +let increment_revision revision = + match revision with + | Utils.Rev_int n -> Utils.Rev_int (n + 1) + | Utils.Rev_string s -> + if Str.string_match (Str.regexp "^\\(.*[-._]\\)\\([0-9]+\\)$") s 0 then + let prefix = Str.matched_group 1 s in + let suffix = int_of_string (Str.matched_group 2 s) in + Utils.Rev_string (prefix ^ (string_of_int (suffix + 1))) + else + Utils.Rev_string (s ^ ".1") + +let checksums_get_sha512 checksums = + match checksums with + | Some csums -> ( + try + List.find ( + fun c -> + match c with + | Checksums.SHA512 _ -> true + | _ -> false + ) csums + with + | _ -> Checksums.SHA512 "" + ) + | None -> Checksums.SHA512 "" + +let osinfo_ids = ref None + +let osinfo_get_short_ids () = + match !osinfo_ids with + | Some ids -> ids + | None -> ( + let set = ref StringSet.empty in + let g = open_guestfs () in + + Osinfo.read_osinfo_db g#ocaml_handle ( + fun filepath -> + let doc = Xml.parse_file filepath in + let xpathctx = Xml.xpath_new_context doc in + let nodes = xpath_get_nodes xpathctx "/libosinfo/os/short-id" in + List.iter ( + fun node -> + let id = Xml.node_as_string node in + set := StringSet.add id !set + ) nodes + ); + g#close (); + osinfo_ids := Some (!set); + !set + ) + +let compress_to file outdir = + let outimg = outdir // (Filename.basename file) ^ ".xz" in + + info "Compressing ...%!"; + let cmd = sprintf "cat \"%s\" | xz -f --best --block-size=16777216 - >\"%s\"" + file outimg in + if shell_command cmd <> 0 then + exit 1; + outimg + +let get_disk_image_info filepath = + let qemuimg_cmd = "qemu-img info --output json " ^ (quote filepath) in + let lines = external_command qemuimg_cmd in + let line = String.concat "\n" lines in + let infos = yajl_tree_parse line in + { + format = object_get_string "format" infos; + size = object_get_number "virtual-size" infos + } + +let compute_short_id distro major minor = + match distro with + | "sles" + | "sled" -> sprintf "%s%dsp%d" distro major minor + | "fedora" -> sprintf "%s%d" distro major + | _ -> sprintf "%s%d.%d" distro major minor + +let has_entry id arch index = + List.exists ( + fun (item_id, { Index.arch = item_arch }) -> + item_id = id && item_arch = arch + ) index + +let process_image acc_entries filename repo tmprepo index interactive + no_compression sigchecker = + message (f_"Preparing %s") filename; + + let filepath = repo // filename in + let { format = format; size = size } = get_disk_image_info filepath in + let out_path = if no_compression then + filepath + else + compress_to filepath tmprepo in + let out_filename = Filename.basename out_path in + let checksum = Checksums.compute_checksum "sha512" out_path in + let compressed_size = (Unix.LargeFile.stat out_path).Unix.LargeFile.st_size in + + let ask ?default ?values message = + let default_str = match default with + | None -> "" + | Some x -> sprintf " [%s] " x in + + let list_str = match values with + | None -> "" + | Some x -> + sprintf (f_"Choose one from the list below:\n %s\n") + (String.concat "\n " x) in + + printf "%s%s%s" message default_str list_str; + + let value = read_line () in + match value with + | "" -> default + | s -> Some s + in + + let rec ask_id default = + match ask (s_"Identifier: ") ~default with + | None -> default + | Some id -> + if not (Str.string_match (Str.regexp "[a-zA-Z0-9-_.]+") id 0) then ( + warning (f_"Allowed characters are letters, digits, - _ and ."); + ask_id default + ) else + id in + + let ask_arch guess = + let arches = [ "x86_64"; "aarch64"; "armv7l"; "i686"; "ppc64"; "ppc64le"; "s390x" ] in + match (ask (s_"Architecture: ") ~default:guess ~values:arches) with + | None -> "unknown" + | Some x -> x + in + + let ask_osinfo default = + match ask (s_ "osinfo short ID (can be found with osinfo-query os command): ") + ~default with + | None -> None + | Some osinfo -> + let osinfo_ids = osinfo_get_short_ids () in + if not (StringSet.mem osinfo osinfo_ids) then + warning (f_"'%s' is not a recognized osinfo OS id; using it anyway") osinfo; + Some osinfo in + + (* Do we have an entry for that file already? *) + let file_entry = + try + List.hd ( + List.filter ( + fun (_, { Index.file_uri = file_uri }) -> + let basename = Filename.basename file_uri in + basename = out_filename || basename = filename + ) index + ) + with + | Failure _ -> + let entry = { Index.printable_name = None; + osinfo = None; + file_uri = ""; + arch = ""; + signature_uri = None; + checksums = None; + revision = Utils.Rev_int 0; + format = Some format; + size = size; + compressed_size = Some compressed_size; + expand = None; + lvexpand = None; + notes = []; + hidden = false; + aliases = None; + sigchecker = sigchecker; + proxy = Curl.UnsetProxy } in + ("", entry) in + + let id, { Index.printable_name = printable_name; + osinfo = osinfo; + arch = arch; + checksums = checksums; + revision = revision; + expand = expand; + lvexpand = lvexpand; + notes = notes; + hidden = hidden; + aliases = aliases } = file_entry in + + let old_checksum = checksums_get_sha512 checksums in + + if old_checksum = checksum then + let id, entry = file_entry in + (id, { entry with Index.file_uri = out_filename }) + else ( + message (f_"Extracting data from the image..."); + let g = new Guestfs.guestfs () in + g#add_drive_ro filepath; + g#launch (); + + let roots = g#inspect_os () in + let nroots = Array.length roots in + if nroots <> 1 then + error (f_"virt-builder template images must have one and only one root file system, found %d") + nroots; + + let root = Array.get roots 0 in + let product = g#inspect_get_product_name root in + let inspected_arch = g#inspect_get_arch root in + let distro = g#inspect_get_distro root in + let version_major = g#inspect_get_major_version root in + let version_minor = g#inspect_get_minor_version root in + let lvs = g#lvs () in + let filesystems = g#inspect_get_filesystems root in + + let shortid = compute_short_id distro version_major version_minor in + + g#close (); + + let id = + if id = "" then ( + if interactive then ask_id shortid + else error (f_"missing image identifier"); + ) else id in + + let arch = + if arch = "" then ( + if interactive then ask_arch inspected_arch + else inspected_arch; + ) else arch in + + if arch = "" then + error (f_"missing architecture for %s") id; + + if has_entry id arch acc_entries then + error (f_"Already existing image with id %s and architecture %s") id arch; + + let printable_name = + if printable_name = None then + if interactive then ask (s_"Display name: ") ~default:product + else Some product + else + printable_name in + + let osinfo = + if osinfo = None then + if interactive then ask_osinfo shortid else Some shortid + else + osinfo in + + let expand = + if expand = None then + if interactive then ask (s_"Expandable partition: ") ~default:root + ~values:(Array.to_list filesystems) + else Some root + else + expand in + + let lvexpand = + if lvexpand = None && lvs <> [||] then + if interactive then + ask (s_"Expandable volume: ") ~values:(Array.to_list lvs) + else Some (Array.get lvs 0) + else + lvexpand in + + let revision = + if old_checksum <> checksum then + increment_revision revision + else + revision in + + (id, { Index.printable_name = printable_name; + osinfo = osinfo; + file_uri = Filename.basename out_path; + arch = arch; + signature_uri = None; + checksums = Some [checksum]; + revision = revision; + format = Some format; + size = size; + compressed_size = Some compressed_size; + expand = expand; + lvexpand = lvexpand; + notes = notes; + hidden = hidden; + aliases = aliases; + sigchecker = sigchecker; + proxy = Curl.UnsetProxy }) + ) + +let main () = + let cmdline = parse_cmdline () in + + (* If debugging, echo the command line arguments. *) + debug "command line: %s\n" (String.concat " " (Array.to_list Sys.argv)); + + (* Check that the paths are existing *) + if not (Sys.file_exists cmdline.repo) then + error (f_"repository folder '%s' doesn't exist") cmdline.repo; + + (* Create a temporary folder to work in *) + let tmpdir = Mkdtemp.temp_dir ~base_dir:cmdline.repo + "virt-builder-repository." "" in + rmdir_on_exit tmpdir; + + let tmprepo = tmpdir // "repo" in + mkdir_p tmprepo 0o700; + + let sigchecker = Sigchecker.create ~gpg:cmdline.gpg + ~check_signature:false + ~gpgkey:No_Key + ~tmpdir in + + let index = + try + let index_filename = + List.find ( + fun filename -> Sys.file_exists (cmdline.repo // filename) + ) [ "index.asc"; "index" ] in + + let downloader = Downloader.create ~curl:"do-not-use-curl" + ~cache:None ~tmpdir in + + let source = { Sources.name = index_filename; + uri = cmdline.repo // index_filename; + gpgkey = No_Key; + proxy = Curl.SystemProxy; + format = Sources.FormatNative } in + + Index_parser.get_index ~downloader ~sigchecker ~template:true source + with Not_found -> [] in + + (* Check for index/interactive consistency *) + if not cmdline.interactive && index == [] then + error (f_"the repository must contain an index file when running in automated mode"); + + debug "Searching for images ...\n"; + + let images = + let is_supported_format file = + let extension = last_part_of file '.' in + match extension with + | Some ext -> List.mem ext [ "qcow2"; "raw"; "img" ] + | None -> file <> "index" in + let is_new file = + try + let _, { Index.checksums = checksums } = + List.find ( + fun (_, { Index.file_uri = file_uri }) -> + Filename.basename file_uri = file + ) index in + let checksum = checksums_get_sha512 checksums in + let path = cmdline.repo // file in + let file_checksum = Checksums.compute_checksum "sha512" path in + checksum <> file_checksum + with Not_found -> true in + let files = Array.to_list (Sys.readdir cmdline.repo) in + List.filter ( + fun file -> + if is_supported_format file then + is_new file + else + false + ) files in + + if images == [] then ( + info (f_ "No new image found"); + exit 0 + ); + + info (f_ "Found new images: %s") (String.concat " " images); + + let outindex_path = tmprepo // "index" in + let index_channel = open_out outindex_path in + + (* Generate entries for uncompressed images *) + let images_entries = List.fold_right ( + fun filename acc -> + let image_entry = process_image acc filename cmdline.repo tmprepo + index cmdline.interactive cmdline.no_compression + sigchecker in + image_entry :: acc + ) images [] in + + (* Filter out entries for newly found images and entries + without a corresponding image file or with empty arch *) + let index = List.filter ( + fun (id, { Index.arch = arch; + Index.file_uri = file_uri }) -> + arch <> "" && not (has_entry id arch images_entries) && + Sys.file_exists file_uri + ) index in + + (* Convert all URIs back to relative ones *) + let index = List.map ( + fun (id, entry) -> + let { Index.file_uri = file_uri } = entry in + let rel_path = + try + subdirectory cmdline.repo file_uri + with + | Invalid_argument _ -> + file_uri in + let rel_entry = { entry with Index.file_uri = rel_path } in + (id, rel_entry) + ) index in + + (* Write all the entries *) + List.iter ( + fun entry -> + Index_parser.write_entry index_channel entry; + ) (index @ images_entries); + + close_out index_channel; + + (* GPG sign the generated index *) + (match cmdline.gpgkey with + | None -> + debug "Skip index signing" + | Some gpgkey -> + message (f_"Signing index with GPG key %s") gpgkey; + let cmd = sprintf "%s --armor --output %s/index.gpg --export %s" + cmdline.gpg tmprepo gpgkey in + if shell_command cmd <> 0 then + error (f_"failed to export GPG key %s") gpgkey; + + let cmd = sprintf "%s --armor --default-key %s --clearsign %s/index" + cmdline.gpg gpgkey tmprepo in + if shell_command cmd <> 0 then + error (f_"failed to sign index"); + + (* Remove the index file since we have the signed version of it *) + if not cmdline.keep_unsigned then + Sys.remove (tmprepo // "index") + ); + + message (f_"Creating index backup copy"); + + List.iter ( + fun filename -> + let filepath = cmdline.repo // filename in + if Sys.file_exists filepath then + do_mv filepath (filepath ^ ".bak") + ) ["index"; "index.asc"]; + + message (f_"Moving files to final destination"); + + Array.iter ( + fun filename -> + do_mv (tmprepo // filename) cmdline.repo + ) (Sys.readdir tmprepo); + + debug "Cleanup"; + + (* Remove the processed image files *) + if not cmdline.no_compression then + List.iter ( + fun filename -> Sys.remove (cmdline.repo // filename) + ) images + +let () = run_main_and_handle_errors main diff --git a/builder/test-docs.sh b/builder/test-docs.sh index 884135de6..6f39b906d 100755 --- a/builder/test-docs.sh +++ b/builder/test-docs.sh @@ -25,3 +25,5 @@ $top_srcdir/podcheck.pl virt-builder.pod virt-builder \ --insert $top_srcdir/customize/customize-synopsis.pod:__CUSTOMIZE_SYNOPSIS__ \ --insert $top_srcdir/customize/customize-options.pod:__CUSTOMIZE_OPTIONS__ \ --ignore=--check-signatures,--no-check-signatures + +$srcdir/../podcheck.pl virt-builder-repository.pod virt-builder-repository diff --git a/builder/virt-builder-repository.pod b/builder/virt-builder-repository.pod new file mode 100644 index 000000000..0521a8e01 --- /dev/null +++ b/builder/virt-builder-repository.pod @@ -0,0 +1,209 @@ +=begin html + +<img src="virt-builder.svg" width="250" + style="float: right; clear: right;" /> + +=end html + +=head1 NAME + +virt-builder-repository - Build virt-builder source repository easily + +=head1 SYNOPSIS + + virt-builder-repository /path/to/repository + [-i|--interactive] [--gpg-key KEYID] + +=head1 DESCRIPTION + +Virt-builder is a tool for quickly building new virtual machines. It can +be configured to use template repositories. However creating and +maintaining a repository involves many tasks which can be automated. +virt-builder-repository is a tool helping to manage these repositories. + +Virt-builder-repository loops over the files in the C</path/to/repository> +folder, compresses the files with a name ending by C<qcow2>, C<raw> or +C<img>, extracts data from them and creates or updates the C<index> file. + +Some of the image-related data needed for the index file can't be +computed from the image file. virt-builder-repository first tries to +find them in the existing index file. If data are still missing after +this, they are prompted in interactive mode, otherwise an error will +be triggered. + +If a C<KEYID> is provided, the generated index file will be signed +with this GPG key. + +=head1 EXAMPLES + +=head2 Create the initial repository + +Create a folder and copy the disk image template files in it. Then +run a command like the following one: + + virt-builder-repository --gpg-key &quot;joe(a)hacker.org&quot; -i /path/to/folder + +Note that this example command runs in interactive mode. To run in +automated mode, a minimal index file needs to be created before running +the command containing sections like this one: + + [template_id] + file=template_filename.qcow.xz + +The file value needs to match the image name extended with the ".xz" +suffix if the C<--no-compression> parameter is not provided or the +image name if no compression is involved. Other optional data can be +prefilled. Default values are computed by inspecting the disk image. +For more informations, see +L<virt-builder(1)/Creating and signing the index file>. + +=head2 Update images in an existing repository + +In this use case, an new image or a new revision of an existing image +needs to be added to the repository. Place the corresponding image +template files in the repository folder. + +To update the revision of an image, the file needs to have the same +name than the existing one (without the C<xz> extension). + +As in the repository creation use case, a minimal fragment can be +added to the index file for the automated mode. This can be done +on the signed index even if it may sound a strange idea: the index +will be resigned by the tool. + +To remove an image from the repository, just remove the corresponding +compressed image file before running virt-builder-repository. + +Then running the following command will complete and update the index +file: + + virt-builder-repository --gpg-key &quot;joe(a)hacker.org&quot; -i /path/to/folder + +virt-builder-repository works in a temporary folder inside the repository +one. If anything wrong happens when running the tool, the repository is +left untouched. + +=head1 OPTIONS + +=over 4 + +=item B<--help> + +Display help. + +=item B<--gpg> GPG + +Specify an alternate L<gpg(1)> (GNU Privacy Guard) binary. You can +also use this to add gpg parameters, for example to specify an +alternate home directory: + + virt-builder-repository --gpg "gpg --homedir /tmp" [...] + +This can also be used to avoid gpg asking for the key passphrase: + + virt-builder-repository --gpg "gpg --passphrase-file /tmp/pass --batch" [...] + +=item B<-K> KEYID + +=item B<--gpg-key> KEYID + +Specify the GPG key to be used to sign the repository index file. +If not provided, the index will left unsigned. C<KEYID> is used to +identify the GPG key to use. This value is passed to gpg's +C<--default-key> option and can can thus be an email address or a +fingerprint. + +B<NOTE>: by default, virt-builder-repository searches for the key +in the user's GPG key ring. + +=item B<-i> + +=item B<--interactive> + +Prompt for missing data. Default values are computed from the disk +image. + +=item B<--keep-index> + +When using a GPG key, don't remove the unsigned index. + +=item B<--no-compression> + +Don't compress the template images. + +=item B<--machine-readable> + +This option is used to make the output more machine friendly +when being parsed by other programs. See +L</MACHINE READABLE OUTPUT> below. + + +=item B<--colors> + +=item B<--colours> + +Use ANSI colour sequences to colourize messages. This is the default +when the output is a tty. If the output of the program is redirected +to a file, ANSI colour sequences are disabled unless you use this +option. + +=item B<-q> + +=item B<--quiet> + +Don't print ordinary progress messages. + +=item B<-v> + +=item B<--verbose> + +Enable debug messages and/or produce verbose output. + +When reporting bugs, use this option and attach the complete output to +your bug report. + +=item B<-V> + +=item B<--version> + +Display version number and exit. + +=item B<-x> + +Enable tracing of libguestfs API calls. + + +=back + +=head1 MACHINE READABLE OUTPUT + +The I<--machine-readable> option can be used to make the output more +machine friendly, which is useful when calling virt-builder-repository from +other programs, GUIs etc. + +Use the option on its own to query the capabilities of the +virt-builder-repository binary. Typical output looks like this: + + $ virt-builder-repository --machine-readable + virt-builder-repository + +A list of features is printed, one per line, and the program exits +with status 0. + +=head1 EXIT STATUS + +This program returns 0 if successful, or non-zero if there was an +error. + +=head1 SEE ALSO + +L<virt-builder(1)> +L<http://libguestfs.org/>. + +=head1 AUTHOR + +Cédric Bosdonnat L<mailto:cbosdonnat@suse.com> + +=head1 COPYRIGHT + +Copyright (C) 2016-2017 SUSE Inc. -- 2.12.0