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1# Copyright (C) 2004, Advanced Micro Devices, Inc.
2#
3# SPDX-License-Identifier: MIT
4
5# Creates a bootable image using syslinux, your kernel and an optional
6# initrd
7
8#
9# End result is two things:
10#
11# 1. A .hddimg file which is an msdos filesystem containing syslinux, a kernel,
12# an initrd and a rootfs image. These can be written to harddisks directly and
13# also booted on USB flash disks (write them there with dd).
14#
15# 2. A CD .iso image
16
17# Boot process is that the initrd will boot and process which label was selected
18# in syslinux. Actions based on the label are then performed (e.g. installing to
19# an hdd)
20
21# External variables (also used by syslinux.bbclass)
22# ${INITRD} - indicates a list of filesystem images to concatenate and use as an initrd (optional)
23# ${HDDIMG_ID} - FAT image volume-id
24# ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)
25
26inherit live-vm-common image-artifact-names
27
28do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
29 mtools-native:do_populate_sysroot \
30 cdrtools-native:do_populate_sysroot \
31 virtual/kernel:do_deploy \
32 ${MLPREFIX}syslinux:do_populate_sysroot \
33 syslinux-native:do_populate_sysroot \
34 ${@'%s:do_image_%s' % (d.getVar('PN'), d.getVar('LIVE_ROOTFS_TYPE').replace('-', '_')) if d.getVar('ROOTFS') else ''} \
35 "
36
37
38LABELS_LIVE ?= "boot install"
39ROOT_LIVE ?= "root=/dev/ram0"
40INITRD_IMAGE_LIVE ?= "${MLPREFIX}core-image-minimal-initramfs"
41INITRD_LIVE ?= "${DEPLOY_DIR_IMAGE}/${INITRD_IMAGE_LIVE}-${MACHINE}.${INITRAMFS_FSTYPES}"
42
43LIVE_ROOTFS_TYPE ?= "ext4"
44ROOTFS ?= "${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.${LIVE_ROOTFS_TYPE}"
45
46IMAGE_TYPEDEP:live = "${LIVE_ROOTFS_TYPE}"
47IMAGE_TYPEDEP:iso = "${LIVE_ROOTFS_TYPE}"
48IMAGE_TYPEDEP:hddimg = "${LIVE_ROOTFS_TYPE}"
49IMAGE_TYPES_MASKED += "live hddimg iso"
50
51python() {
52 image_b = d.getVar('IMAGE_BASENAME')
53 initrd_i = d.getVar('INITRD_IMAGE_LIVE')
54 if image_b == initrd_i:
55 bb.error('INITRD_IMAGE_LIVE %s cannot use image live, hddimg or iso.' % initrd_i)
56 bb.fatal('Check IMAGE_FSTYPES and INITRAMFS_FSTYPES settings.')
57 elif initrd_i:
58 d.appendVarFlag('do_bootimg', 'depends', ' %s:do_image_complete' % initrd_i)
59}
60
61HDDDIR = "${S}/hddimg"
62ISODIR = "${S}/iso"
63EFIIMGDIR = "${S}/efi_img"
64COMPACT_ISODIR = "${S}/iso.z"
65
66ISOLINUXDIR ?= "/isolinux"
67ISO_BOOTIMG = "isolinux/isolinux.bin"
68ISO_BOOTCAT = "isolinux/boot.cat"
69MKISOFS_OPTIONS = "-no-emul-boot -boot-load-size 4 -boot-info-table"
70
71BOOTIMG_VOLUME_ID ?= "boot"
72BOOTIMG_EXTRA_SPACE ?= "512"
73
74populate_live() {
75 populate_kernel $1
76 if [ -s "${ROOTFS}" ]; then
77 install -m 0644 ${ROOTFS} $1/rootfs.img
78 fi
79}
80
81build_iso() {
82 # Only create an ISO if we have an INITRD and the live or iso image type was selected
83 if [ -z "${INITRD}" ] || [ "${@bb.utils.contains_any('IMAGE_FSTYPES', 'live iso', '1', '0', d)}" != "1" ]; then
84 bbnote "ISO image will not be created."
85 return
86 fi
87 # ${INITRD} is a list of multiple filesystem images
88 for fs in ${INITRD}
89 do
90 if [ ! -s "$fs" ]; then
91 bbwarn "ISO image will not be created. $fs is invalid."
92 return
93 fi
94 done
95
96 populate_live ${ISODIR}
97
98 if [ "${PCBIOS}" = "1" ]; then
99 syslinux_iso_populate ${ISODIR}
100 fi
101 if [ "${EFI}" = "1" ]; then
102 efi_iso_populate ${ISODIR}
103 build_fat_img ${EFIIMGDIR} ${ISODIR}/efi.img
104 fi
105
106 # EFI only
107 if [ "${PCBIOS}" != "1" ] && [ "${EFI}" = "1" ] ; then
108 # Work around bug in isohybrid where it requires isolinux.bin
109 # In the boot catalog, even though it is not used
110 mkdir -p ${ISODIR}/${ISOLINUXDIR}
111 install -m 0644 ${STAGING_DATADIR}/syslinux/isolinux.bin ${ISODIR}${ISOLINUXDIR}
112 fi
113
114 # We used to have support for zisofs; this is a relic of that
115 mkisofs_compress_opts="-r"
116
117 # Check the size of ${ISODIR}/rootfs.img, use mkisofs -iso-level 3
118 # when it exceeds 3.8GB, the specification is 4G - 1 bytes, we need
119 # leave a few space for other files.
120 mkisofs_iso_level=""
121
122 if [ -n "${ROOTFS}" ] && [ -s "${ROOTFS}" ]; then
123 rootfs_img_size=`stat -c '%s' ${ISODIR}/rootfs.img`
124 # 4080218931 = 3.8 * 1024 * 1024 * 1024
125 if [ $rootfs_img_size -gt 4080218931 ]; then
126 bbnote "${ISODIR}/rootfs.img execeeds 3.8GB, using '-iso-level 3' for mkisofs"
127 mkisofs_iso_level="-iso-level 3"
128 fi
129 fi
130
131 if [ "${PCBIOS}" = "1" ] && [ "${EFI}" != "1" ] ; then
132 # PCBIOS only media
133 mkisofs -V ${BOOTIMG_VOLUME_ID} \
134 -o ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso \
135 -b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
136 $mkisofs_compress_opts \
137 ${MKISOFS_OPTIONS} $mkisofs_iso_level ${ISODIR}
138 else
139 # EFI only OR EFI+PCBIOS
140 mkisofs -A ${BOOTIMG_VOLUME_ID} -V ${BOOTIMG_VOLUME_ID} \
141 -o ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso \
142 -b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
143 $mkisofs_compress_opts ${MKISOFS_OPTIONS} $mkisofs_iso_level \
144 -eltorito-alt-boot -eltorito-platform efi \
145 -b efi.img -no-emul-boot \
146 ${ISODIR}
147 isohybrid_args="-u"
148 fi
149
150 isohybrid $isohybrid_args ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso
151}
152
153build_fat_img() {
154 FATSOURCEDIR=$1
155 FATIMG=$2
156
157 # Calculate the size required for the final image including the
158 # data and filesystem overhead.
159 # Sectors: 512 bytes
160 # Blocks: 1024 bytes
161
162 # Determine the sector count just for the data
163 SECTORS=$(expr $(du --apparent-size -ks ${FATSOURCEDIR} | cut -f 1) \* 2)
164
165 # Account for the filesystem overhead. This includes directory
166 # entries in the clusters as well as the FAT itself.
167 # Assumptions:
168 # FAT32 (12 or 16 may be selected by mkdosfs, but the extra
169 # padding will be minimal on those smaller images and not
170 # worth the logic here to caclulate the smaller FAT sizes)
171 # < 16 entries per directory
172 # 8.3 filenames only
173
174 # 32 bytes per dir entry
175 DIR_BYTES=$(expr $(find ${FATSOURCEDIR} | tail -n +2 | wc -l) \* 32)
176 # 32 bytes for every end-of-directory dir entry
177 DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 32))
178 # 4 bytes per FAT entry per sector of data
179 FAT_BYTES=$(expr $SECTORS \* 4)
180 # 4 bytes per FAT entry per end-of-cluster list
181 FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 4))
182
183 # Use a ceiling function to determine FS overhead in sectors
184 DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512)
185 # There are two FATs on the image
186 FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2)
187 SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS))
188
189 # Determine the final size in blocks accounting for some padding
190 BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE})
191
192 # mkdosfs will sometimes use FAT16 when it is not appropriate,
193 # resulting in a boot failure from SYSLINUX. Use FAT32 for
194 # images larger than 512MB, otherwise let mkdosfs decide.
195 if [ $(expr $BLOCKS / 1024) -gt 512 ]; then
196 FATSIZE="-F 32"
197 fi
198
199 # mkdosfs will fail if ${FATIMG} exists. Since we are creating an
200 # new image, it is safe to delete any previous image.
201 if [ -e ${FATIMG} ]; then
202 rm ${FATIMG}
203 fi
204
205 if [ -z "${HDDIMG_ID}" ]; then
206 mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} ${MKDOSFS_EXTRAOPTS} -C ${FATIMG} \
207 ${BLOCKS}
208 else
209 mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} ${MKDOSFS_EXTRAOPTS} -C ${FATIMG} \
210 ${BLOCKS} -i ${HDDIMG_ID}
211 fi
212
213 # Copy FATSOURCEDIR recursively into the image file directly
214 mcopy -i ${FATIMG} -s ${FATSOURCEDIR}/* ::/
215}
216
217build_hddimg() {
218 # Create an HDD image
219 if [ "${@bb.utils.contains_any('IMAGE_FSTYPES', 'live hddimg', '1', '0', d)}" = "1" ] ; then
220 populate_live ${HDDDIR}
221
222 if [ "${PCBIOS}" = "1" ]; then
223 syslinux_hddimg_populate ${HDDDIR}
224 fi
225 if [ "${EFI}" = "1" ]; then
226 efi_hddimg_populate ${HDDDIR}
227 fi
228
229 # Check the size of ${HDDDIR}/rootfs.img, error out if it
230 # exceeds 4GB, it is the single file's max size of FAT fs.
231 if [ -f ${HDDDIR}/rootfs.img ]; then
232 rootfs_img_size=`stat -c '%s' ${HDDDIR}/rootfs.img`
233 max_size=`expr 4 \* 1024 \* 1024 \* 1024`
234 if [ $rootfs_img_size -ge $max_size ]; then
235 bberror "${HDDDIR}/rootfs.img rootfs size is greather than or equal to 4GB,"
236 bberror "and this doesn't work on a FAT filesystem. You can either:"
237 bberror "1) Reduce the size of rootfs.img, or,"
238 bbfatal "2) Use wic, vmdk,vhd, vhdx or vdi instead of hddimg\n"
239 fi
240 fi
241
242 build_fat_img ${HDDDIR} ${IMGDEPLOYDIR}/${IMAGE_NAME}.hddimg
243
244 if [ "${PCBIOS}" = "1" ]; then
245 syslinux_hddimg_install
246 fi
247
248 chmod 644 ${IMGDEPLOYDIR}/${IMAGE_NAME}.hddimg
249 fi
250}
251
252python do_bootimg() {
253 set_live_vm_vars(d, 'LIVE')
254 if d.getVar("PCBIOS") == "1":
255 bb.build.exec_func('build_syslinux_cfg', d)
256 if d.getVar("EFI") == "1":
257 bb.build.exec_func('build_efi_cfg', d)
258 bb.build.exec_func('build_hddimg', d)
259 bb.build.exec_func('build_iso', d)
260 bb.build.exec_func('create_symlinks', d)
261}
262do_bootimg[subimages] = "hddimg iso"
263do_bootimg[imgsuffix] = "."
264
265addtask bootimg before do_image_complete after do_rootfs
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2025-12-15 22:10:43 +0000