aboutsummaryrefslogtreecommitdiffstats
path: root/meta/classes/bootimg.bbclass
blob: a4c0e8d93108700820e80c9769847f1f11940c72 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
# Copyright (C) 2004, Advanced Micro Devices, Inc.  All Rights Reserved
# Released under the MIT license (see packages/COPYING)

# Creates a bootable image using syslinux, your kernel and an optional
# initrd

#
# End result is two things:
#
# 1. A .hddimg file which is an msdos filesystem containing syslinux, a kernel,
# an initrd and a rootfs image. These can be written to harddisks directly and
# also booted on USB flash disks (write them there with dd).
#
# 2. A CD .iso image

# Boot process is that the initrd will boot and process which label was selected
# in syslinux. Actions based on the label are then performed (e.g. installing to
# an hdd)

# External variables (also used by syslinux.bbclass)
# ${INITRD} - indicates a filesystem image to use as an initrd (optional)
# ${NOISO}  - skip building the ISO image if set to 1
# ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)

do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
                        mtools-native:do_populate_sysroot \
                        cdrtools-native:do_populate_sysroot"

PACKAGES = " "
EXCLUDE_FROM_WORLD = "1"

HDDDIR = "${S}/hddimg"
ISODIR = "${S}/iso"

BOOTIMG_VOLUME_ID   ?= "boot"
BOOTIMG_EXTRA_SPACE ?= "512"

EFI = "${@base_contains("MACHINE_FEATURES", "efi", "1", "0", d)}"
EFI_CLASS = "${@base_contains("MACHINE_FEATURES", "efi", "grub-efi", "dummy", d)}"

# Include legacy boot if MACHINE_FEATURES includes "pcbios" or if it does not
# contain "efi". This way legacy is supported by default if neither is
# specified, maintaining the original behavior.
def pcbios(d):
	pcbios = base_contains("MACHINE_FEATURES", "pcbios", "1", "0", d)
	if pcbios == "0":
		pcbios = base_contains("MACHINE_FEATURES", "efi", "0", "1", d)
	return pcbios

def pcbios_class(d):
	if d.getVar("PCBIOS", True) == "1":
		return "syslinux"
	return "dummy"

PCBIOS = "${@pcbios(d)}"
PCBIOS_CLASS = "${@pcbios_class(d)}"

inherit ${PCBIOS_CLASS}
inherit ${EFI_CLASS}

populate() {
	DEST=$1
	install -d ${DEST}

	# Install bzImage, initrd, and rootfs.img in DEST for all loaders to use.
	install -m 0644 ${STAGING_KERNEL_DIR}/bzImage ${DEST}/vmlinuz

	if [ -n "${INITRD}" ] && [ -s "${INITRD}" ]; then
		install -m 0644 ${INITRD} ${DEST}/initrd
	fi

	if [ -n "${ROOTFS}" ] && [ -s "${ROOTFS}" ]; then
		install -m 0644 ${ROOTFS} ${DEST}/rootfs.img
	fi

}

build_iso() {
	# Only create an ISO if we have an INITRD and NOISO was not set
	if [ -z "${INITRD}" ] || [ ! -s "${INITRD}" ] || [ "${NOISO}" = "1" ]; then
		bbnote "ISO image will not be created."
		return
	fi

	populate ${ISODIR}

	if [ "${PCBIOS}" = "1" ]; then
		syslinux_iso_populate
	fi
	if [ "${EFI}" = "1" ]; then
		grubefi_iso_populate
	fi

	if [ "${PCBIOS}" = "1" ]; then
		mkisofs -V ${BOOTIMG_VOLUME_ID} \
		        -o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
			-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} -r \
			${MKISOFS_OPTIONS} ${ISODIR}
	else
		bbnote "EFI-only ISO images are untested, please provide feedback."
		mkisofs -V ${BOOTIMG_VOLUME_ID} \
		        -o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
			-r ${ISODIR}
	fi

	isohybrid ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso

	cd ${DEPLOY_DIR_IMAGE}
	rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
	ln -s ${IMAGE_NAME}.iso ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
}

build_hddimg() {
	# Create an HDD image
	if [ "${NOHDD}" != "1" ] ; then
		populate ${HDDDIR}

		if [ "${PCBIOS}" = "1" ]; then
			syslinux_hddimg_populate
		fi
		if [ "${EFI}" = "1" ]; then
			grubefi_hddimg_populate
		fi

		# Calculate the size required for the final image including the
		# data and filesystem overhead.
		# Sectors: 512 bytes
		#  Blocks: 1024 bytes

		# Determine the sector count just for the data
		SECTORS=$(expr $(du --apparent-size -ks ${HDDDIR} | cut -f 1) \* 2)

		# Account for the filesystem overhead. This includes directory
		# entries in the clusters as well as the FAT itself.
		# Assumptions:
		#   FAT32 (12 or 16 may be selected by mkdosfs, but the extra
		#   padding will be minimal on those smaller images and not
		#   worth the logic here to caclulate the smaller FAT sizes)
		#   < 16 entries per directory
		#   8.3 filenames only

		# 32 bytes per dir entry
		DIR_BYTES=$(expr $(find ${HDDDIR} | tail -n +2 | wc -l) \* 32)
		# 32 bytes for every end-of-directory dir entry
		DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${HDDDIR} -type d | tail -n +2 | wc -l) \* 32))
		# 4 bytes per FAT entry per sector of data
		FAT_BYTES=$(expr $SECTORS \* 4)
		# 4 bytes per FAT entry per end-of-cluster list
		FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${HDDDIR} -type d | tail -n +2 | wc -l) \* 4))

		# Use a ceiling function to determine FS overhead in sectors
		DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512)
		# There are two FATs on the image
		FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2)
		SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS))

		# Determine the final size in blocks accounting for some padding
		BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE})

		# Ensure total sectors is an integral number of sectors per
		# track or mcopy will complain. Sectors are 512 bytes, and we
		# generate images with 32 sectors per track. This calculation is
		# done in blocks, thus the mod by 16 instead of 32.
		BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16)))

		IMG=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg
		mkdosfs -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${IMG} ${BLOCKS}
		# Copy HDDDIR recursively into the image file directly
		mcopy -i ${IMG} -s ${HDDDIR}/* ::/

		if [ "${PCBIOS}" = "1" ]; then
			syslinux_hddimg_install
		fi

		chmod 644 ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg

		cd ${DEPLOY_DIR_IMAGE}
		rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
		ln -s ${IMAGE_NAME}.hddimg ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
	fi
}

python do_bootimg() {
	if d.getVar("PCBIOS", True) == "1":
		bb.build.exec_func('build_syslinux_cfg', d)
	if d.getVar("EFI", True) == "1":
		bb.build.exec_func('build_grub_cfg', d)
	bb.build.exec_func('build_hddimg', d)
	bb.build.exec_func('build_iso', d)
}

addtask bootimg before do_build
do_bootimg[nostamp] = "1"