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[osdn-codes/image-creator.git] / create-image
1 #!/usr/bin/ruby
2 require 'pp'
3 require 'shellwords'
4 require 'tmpdir'
5 require 'yaml'
6 require 'json'
7
8 class SyncDirDef
9   DEFAULT_EXCLUDE = %w[/proc/* /sys/* /dev/mqueue /dev/hugepages /run/* /var/lib/os-prober/mount /swap /dev/shm/* /var/lib/lxcfs/*]
10   attr_accessor :path, :size, :exclude, :size, :srcpath, :fs_features, :device, :fs_uuid
11   def initialize(path: '/', size: 8, exclude: DEFAULT_EXCLUDE, srcpath: nil, fs_features: nil)
12     @path = path
13     @size = size.to_f
14     @exclude = (DEFAULT_EXCLUDE + [*exclude]).uniq
15     @srcpath = srcpath || path
16     @fs_features = fs_features
17     @device = nil
18     @fs_uuid = nil
19   end
20 end
21
22 class ImageCreator
23   attr_accessor :name, :dirs, :src_host, :img_path_base
24   MiB = 1024 ** 2
25   GiB = 1024 ** 3
26
27   def initialize(name, dirs, src_host: nil)
28     @name = name
29     @dirs = dirs
30     @src_host = src_host || name
31     @img_path_base = "#{name}_#{Time.now.strftime '%FT%T%z'}"
32   end
33
34   def imgpath(idx)
35     "#{img_path_base}_#{idx}.img"
36   end
37
38   def create_disk
39     dirs.each_with_index do |di, idx|
40       _create_disk imgpath(idx), di, idx != 0
41     end
42   end
43
44   def _create_disk path, di, use_gpt = false
45     size_gb = di.size
46     raise "Disk image #{path} is already exists!" if File.exists? path
47     puts "Creating disk image #{path} (#{'%5.2f' % size_gb.to_f} GiB)..."
48     File.open(path, "w") do |f|
49       f.truncate(size_gb * GiB)
50     end
51     system("parted", "-s", path, "mklabel", use_gpt ? 'gpt' : 'msdos') or raise "Failed to create partition label"
52     system("parted", "-s", path, "mkpart", "primary", "1MiB", "#{size_gb * 1024 - 1}MiB") or raise "Failed to create partition"
53     if !use_gpt
54       system("parted", "-s", path, "set", "1", "boot", "on") or raise "Failed to set bios boot partition"
55     end
56     puts "Image partition has been created."
57   end
58   
59   def with_loopdev &block
60     begin
61       devices = []
62       dirs.each_with_index do |di, idx|
63         system("kpartx", "-as", imgpath(idx)) or raise "Failed to map loop device"
64         di.device = "/dev/mapper/" + `kpartx -l #{Shellwords.escape imgpath(idx)}`.split("\n").first[/loop\d+p\d+/]
65         devices << di.device
66       end
67       yield devices
68     ensure
69       dirs.each_with_index do |di, idx|
70         system "kpartx", "-d", imgpath(idx), err: "/dev/null"
71         di.device = nil
72       end
73     end
74   end
75
76   def create_fs
77     with_loopdev do |devices|
78       dirs.each_with_index do |di, index|
79         dev = di.device
80         puts "Creating filesystem on #{dev}..."
81         cmd = %w(mkfs.ext4 -q)
82         di = dirs[index]
83         if di.fs_features
84           cmd << '-O' << di.fs_features
85         end
86         cmd << dev
87         system(*cmd) or raise "Failed to create file system on #{dev}"
88         system "e2label", dev, di.path == '/' ? 'ROOT' : di.path[1..-1].tr('/', '-')
89         di.fs_uuid = `blkid -o value -s UUID #{di.device}`.chomp("\n")
90       end
91     end
92   end
93
94   def sync_dirs
95     with_loopdev do |devices|
96       devices.each_with_index do |dev, idx|
97         di = dirs[idx]
98         mount_point = "/mnt/ci-#{$$}-#{name}-#{idx}"
99         system("mkdir", "-p", mount_point)
100         begin
101           system("mount", dev, mount_point) or raise "Failed to mount file system #{dev} on #{mount_point}"
102           puts "Copying #{src_host}:#{di.srcpath} to #{dev}..."
103           unless system("rsync", "-azHSAX", "--numeric-ids", "--info=progress2", "#{src_host}:#{di.srcpath}/", "#{mount_point}/", *((["--exclude"] * di.exclude.size).zip(di.exclude).flatten))
104             warn "rsync exit with error, file transfer may not be completed."
105           end
106         ensure
107           system("umount", mount_point)
108           File.directory?(mount_point) and
109             Dir.rmdir mount_point
110         end
111       end
112     end
113   end
114
115   def fix_boot
116     puts "Fixing boot environments..."
117     Dir.mktmpdir("ci-#{$$}-#{name}") do |dir|
118       with_loopdev do |devices|
119         puts "Override grub with host version..."
120         root_dev = "/dev/#{devices.first[/loop\d+/]}"
121         rootfs_uuid = dirs.find { |d| d.path == '/'}.fs_uuid
122         puts "New rootfs UUID=#{rootfs_uuid}"
123         begin
124           system("mount", devices.first, dir) or raise "Failed to mount #{devices.first} to #{dir}"
125           system("mount", "--bind", "/dev", "#{dir}/dev") or raise "Failed to mount /dev to #{dir}/dev"
126           system("mount", "--bind", "/proc", "#{dir}/proc") or raise "Failed to mount /proc to #{dir}/proc"
127
128           dirs[1..-1].each_with_index do |di, idx|
129             system "mkdir", "-p", "#{dir}#{di.path}"
130             system("mount", di.device, "#{dir}#{di.path}") or raise "Failed to mount #{di.device} to #{dir}#{path}"
131           end
132
133           system "rm", "-f", "#{dir}/etc/systemd/system/udev.service", "#{dir}/etc/systemd/system/systemd-udevd.service"
134
135           puts "Rewrite fstab..."
136           File.open "#{dir}/etc/fstab", "w" do |f|
137             dirs.each_with_index do |di, idx|
138               f << %W(UUID=#{di.fs_uuid} #{di.path} ext4 defaults,noatime 0 #{di.path == '/' ? 1 : 2}).join("\t")
139               f << "\n"
140             end
141           end
142
143           system("chroot", dir, "apt-get", "-qy", "update")
144           if File.read("#{dir}/etc/debian_version").to_f >= 9.0
145             # Note: 2019-10-08 時点で Debian9 のカーネルバージョンに対応していないので、エラー回避のために既存のカーネルを全て削除し、強制的に jessie のカーネルをイントールする
146             system("rm", "-f", "#{dir}/var/lib/dpkg/info/linux-image-#{`uname -r`.chomp}.prerm")
147             system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt", "remove", "--purge", "-y", "linux-image-*")
148             system("wget", "-O", "#{dir}/tmp/linux.deb", "http://security-cdn.debian.org/debian-security/pool/updates/main/l/linux/linux-image-3.16.0-10-amd64_3.16.81-1_amd64.deb") or raise "Failed to get jessie kernel"
149             system("chroot", dir, "dpkg", "-i", "/tmp/linux.deb")
150             system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt", "install", "-f", "-y") or raise "Failed to install jessie kernel"
151           else
152             system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt-get", "-y", "install", "linux-image-amd64")
153           end
154
155           puts "Update grub..."
156           if File.exists? "#{dir}/var/lib/dpkg/info/grub-efi-amd64.list"
157             system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt", "remove", "--purge", "-y", "grub-efi-amd64") or raise "Failed to purge grub-efi"
158           end
159           unless File.exists? "#{dir}/var/lib/dpkg/info/grub-pc.list"
160             system("chroot", dir, "apt-get", "-qy", "update") or raise "Failed to install grub-pc"
161             system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt-get", "-y", "install", "grub-pc")
162           end
163           File.open "#{dir}/boot/grub/device.map", "w" do |f|
164             f.puts "(hd0)\t#{root_dev}"
165           end
166           system("chroot", dir, "grub-mkconfig", "-o", "/boot/grub/grub.cfg") or raise "grub-mkconfig fails."
167           system(*%W(grub-install --no-floppy --grub-mkdevicemap=#{dir}/boot/grub/device.map --root-directory=#{dir} #{root_dev})) or raise "grub-install failed."
168         ensure
169           system("umount", "#{dir}/dev")
170           system("umount", "#{dir}/proc")
171           dirs.reverse[0..-2].each do |di, idx|
172             system("umount", "#{dir}#{di.path}")
173           end
174           system("umount", dir)
175         end
176       end
177     end
178   end
179
180   def write_json
181     jdef = []
182     dirs.each_with_index do |dir, idx|
183       jdef.push({
184         "Description" => dir.path == '/' ? 'root' : dir.path[1..-1].tr('/', '-'),
185         "Format" => "raw",
186         "UserBucket" => {
187           "S3Bucket" => ENV.fetch("S3_BUCKET", "osdn-base-images"),
188           "S3Key" => "#{ENV.fetch("S3_KEY_PREFIX", "src-disks/")}#{img_path_base}_#{idx}.img"
189         }
190       })
191     end
192     File.write "#{img_path_base}.json", JSON.pretty_generate(jdef)
193   end
194
195
196   def run
197     create_disk
198     create_fs
199     sync_dirs
200     fix_boot
201     write_json
202     puts "Image creation has been complated (#{name})"
203   end
204 end
205
206 if $0 == __FILE__
207   require 'optparse'
208
209   opts = ARGV.getopts('l:', 'limit:', 'skip:')
210   limit_pat = opts['limit'] || opts['l']
211   limit_pat and
212     limit_pat = Regexp.new(limit_pat)
213
214   list = YAML.load_file(ARGV[0] || 'image-list.yml')
215   list.each do |imgdef|
216     name = nil
217     dirs = []
218     if imgdef.kind_of?(Hash)
219       name = imgdef['name']
220       (imgdef['dirs'] || {}).each do |path, opts|
221         opts.kind_of?(Hash) or opts = {size: opts}
222         dirs << SyncDirDef.new({path: path}.merge(opts.keys.map(&:to_sym).zip(opts.values).to_h))
223       end
224     else
225       name = imgdef
226     end
227     if limit_pat
228       limit_pat.match?(name) or next
229     end
230     dirs.empty? and dirs << SyncDirDef.new
231     ImageCreator.new(name, dirs).run
232   end
233 end