aboutsummaryrefslogtreecommitdiff
path: root/scripts/mkroot.sh
blob: ade50a06ec10f62039b3fe988c624d6fd8d06928 (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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
#!/bin/bash

# Clear environment variables by restarting script w/bare minimum passed through
[ -z "$NOCLEAR" ] && exec env -i NOCLEAR=1 HOME="$HOME" PATH="$PATH" \
    "LINUX=$LINUX" "CROSS=$CROSS" CROSS_COMPILE="$CROSS_COMPILE" "$0" "$@"

# assign command line NAME=VALUE args to env vars, keeping rest as packages
while [ $# -ne 0 ]; do
  [ "${1/=/}" != "$1" ] && eval "export ${1/=*/}=\"\${1#*=}\"" ||
    { [ "$1" != '--' ] && PKG="${PKG:-plumbing} $1"; }
  shift
done

die() { echo "$@" >&2; exit 1; }
announce() { echo -e "\033]2;$CROSS $*\007\n=== $*"; }

# Create target-independent working directories (cmdline can change locations)
TOP="$PWD/root"
mkdir -p ${BUILD:=$TOP/build} ${AIRLOCK:=$TOP/airlock} ${LOG:=$TOP/log} ||exit 1

# set CROSS_COMPILE from $CROSS using ccc. Handle "all" w/log, list, and err chk
if [ ! -z "$CROSS" ]; then
  [ ! -d "${CCC:=$PWD/ccc}" ] && die "No ccc symlink to compiler directory."
  CROSS_COMPILE="$(echo "$CCC/$CROSS"-*cross/bin/"$CROSS"*-cc | sed 's/cc$//')"
  if [ "${CROSS::3}" == all ]; then
    for i in $(ls "$CCC" | sed -n 's/-.*//p' | sort -u | xargs); do
      { rm -f "$LOG/$i-log".{failed,success}
        "$0" "$@" CROSS=$i ; [ $((X=$?)) -eq 0 ] && mv "$LOG/$i".{txt,success}
      } |& tee "$LOG/$i.txt"
      [ ! -e "$LOG/$i.success" ] &&
        { mv "$LOG/$i".{txt,failed};[ "$CROSS" != allnonstop ] && exit 1; }
    done
    exit
  elif [ ! -e "${CROSS_COMPILE}cc" ]; then
    ls "$CCC" | sed -n 's/-.*//p' | sort -u | xargs
    exit
  fi
fi

${CROSS_COMPILE}cc --static -xc - -o /dev/null <<< "int main(void){return 0;}"||
  die "${CROSS_COMPILE}cc can't create static binaries"

# Parse and sanity check $CROSS_COMPILE (if any)
if [ ! -z "$CROSS_COMPILE" ]; then
  CROSS_PATH="$(dirname "$(which "${CROSS_COMPILE}cc")")"
  [ -z "$CROSS_PATH" ] && die "no ${CROSS_COMPILE}cc in path"
  : ${CROSS_BASE:=$(basename "$CROSS_COMPILE")} ${CROSS:=${CROSS_BASE/-*/}}
fi
echo "Building for ${CROSS:=host}"

# Create target-specific work/output directories
: ${OUTPUT:=$TOP/$CROSS} ${PKGDIR:=$PWD/scripts/root}
MYBUILD="$BUILD/${CROSS_BASE:-host-}tmp"
rm -rf "$MYBUILD" && mkdir -p "$MYBUILD" || exit 1
[ -z "$ROOT" ] && ROOT="$OUTPUT/fs" && rm -rf "$ROOT" # only blank if NOT set

# When cross compiling build everything under a host toybox with known behavior
if [ ! -z "$CROSS_COMPILE" ]; then
  if [ ! -e "$AIRLOCK/toybox" ]; then
    announce "airlock"
    PREFIX="$AIRLOCK" KCONFIG_CONFIG="$TOP"/.airlock CROSS_COMPILE= \
      make clean defconfig toybox install_airlock && rm "$TOP"/.airlock ||exit 1
  fi
  export PATH="$CROSS_PATH:$AIRLOCK"
fi

# Create new root filesystem's directory layout
mkdir -p "$ROOT"/{etc,tmp,proc,sys,dev,home,mnt,root,usr/{bin,sbin,lib},var} &&
chmod a+rwxt "$ROOT"/tmp && ln -s usr/{bin,sbin,lib} "$ROOT" || exit 1

# Write init script. Runs as pid 1 from initramfs to set up and hand off system.
cat > "$ROOT"/init << 'EOF' &&
#!/bin/sh

export HOME=/home PATH=/bin:/sbin

mountpoint -q proc || mount -t proc proc proc
mountpoint -q sys || mount -t sysfs sys sys
if ! mountpoint -q dev; then
  mount -t devtmpfs dev dev || mdev -s
  for i in ,fd /0,stdin /1,stdout /2,stderr
  do ln -sf /proc/self/fd${i/,*/} dev/${i/*,/}; done
  mkdir -p dev/{shm,pts}
  mountpoint -q dev/pts || mount -t devpts dev/pts dev/pts
  chmod +t /dev/shm
fi

if [ $$ -eq 1 ]; then # Setup networking for QEMU (needs /proc)
  ifconfig lo 127.0.0.1
  ifconfig eth0 10.0.2.15
  route add default gw 10.0.2.2
  [ "$(date +%s)" -lt 1000 ] && timeout 2 sntp -sq 10.0.2.2 # Ask host
  [ "$(date +%s)" -lt 10000000 ] && sntp -sq time.google.com

  # Run package scripts (if any)
  [ -e /etc/rc ] && for i in $(echo /etc/rc/* | sort); do . $i; done

  [ -z "$CONSOLE" ] && CONSOLE="$(</sys/class/tty/console/active)"
  [ -z "$HANDOFF" ] && HANDOFF=/bin/sh && echo Type exit when done.
  exec oneit -c /dev/"${CONSOLE:-console}" $HANDOFF
else # for chroot
  /bin/sh
  umount /dev/pts /dev /sys /proc
fi
EOF
chmod +x "$ROOT"/init &&

# Google's nameserver, passwd+group with special (root/nobody) accounts + guest
echo "nameserver 8.8.8.8" > "$ROOT"/etc/resolv.conf &&
cat > "$ROOT"/etc/passwd << 'EOF' &&
root:x:0:0:root:/root:/bin/sh
guest:x:500:500:guest:/home/guest:/bin/sh
nobody:x:65534:65534:nobody:/proc/self:/dev/null
EOF
echo -e 'root:x:0:\nguest:x:500:\nnobody:x:65534:' > "$ROOT"/etc/group || exit 1

# Build static toybox with existing .config if there is one, else defconfig+sh
announce toybox
[ -e .config ] && CONF=silentoldconfig || unset CONF
make clean ${CONF:-defconfig KCONFIG_ALLCONFIG=<(echo $'CONFIG_SH=y\nCONFIG_ROUTE=y')} &&
LDFLAGS=--static PREFIX="$ROOT" make toybox install || exit 1

# Build any packages listed on command line
for i in $PKG; do
  announce "$i"; PATH="$PKGDIR:$PATH" source $i; [ $? -ne 0 ] && die $i
done

if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ]; then
  echo 'No $LINUX directory, kernel build skipped.'
else
  # Which architecture are we building a kernel for?
  LINUX="$(realpath "$LINUX")"
  [ -z "$TARGET" ] && TARGET="${CROSS_BASE/-*/}"
  [ -z "$TARGET" ] && TARGET="$(uname -m)"

  # Target-specific info in an (alphabetical order) if/else staircase
  # Each target needs board config, serial console, RTC, ethernet, block device.

  if [ "$TARGET" == armv5l ]; then
    # This could use the same VIRT board as armv7, but let's demonstrate a
    # different one requiring a separate device tree binary.
    QEMU="arm -M versatilepb -net nic,model=rtl8139 -net user"
    KARCH=arm KARGS=ttyAMA0 VMLINUX=arch/arm/boot/zImage
    KCONF=CPU_ARM926T,MMU,VFP,ARM_THUMB,AEABI,ARCH_VERSATILE,ATAGS,DEPRECATED_PARAM_STRUCT,ARM_ATAG_DTB_COMPAT,ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_DRV_PL031,RTC_HCTOSYS,PCI,PCI_VERSATILE,BLK_DEV_SD,SCSI,SCSI_LOWLEVEL,SCSI_SYM53C8XX_2,SCSI_SYM53C8XX_MMIO,NET_VENDOR_REALTEK,8139CP
    KERNEL_CONFIG="CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0"
    DTB=arch/arm/boot/dts/versatile-pb.dtb
  elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ]; then
    if [ "$TARGET" == aarch64 ]; then
      QEMU="aarch64 -M virt -cpu cortex-a57"
      KARCH=arm64 VMLINUX=arch/arm64/boot/Image
    else
      QEMU="arm -M virt" KARCH=arm VMLINUX=arch/arm/boot/zImage
    fi
    KARGS=ttyAMA0
    KCONF=MMU,ARCH_MULTI_V7,ARCH_VIRT,SOC_DRA7XX,ARCH_OMAP2PLUS_TYPICAL,ARCH_ALPINE,ARM_THUMB,VDSO,CPU_IDLE,ARM_CPUIDLE,KERNEL_MODE_NEON,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_HCTOSYS,RTC_DRV_PL031,NET_CORE,VIRTIO_MENU,VIRTIO_NET,PCI,PCI_HOST_GENERIC,VIRTIO_BLK,VIRTIO_PCI,VIRTIO_MMIO,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,PATA_PLATFORM,PATA_OF_PLATFORM,ATA_GENERIC
  elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] ||
       [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ]; then
    if [ "$TARGET" == i486 ]; then
      QEMU="i386 -cpu 486 -global fw_cfg.dma_enabled=false" KCONF=M486
    elif [ "$TARGET" == i686 ]; then
      QEMU="i386 -cpu pentium3" KCONF=MPENTIUMII
    else
      QEMU=x86_64 KCONF=64BIT
      [ "$TARGET" == x32 ] && KCONF=X86_X32
    fi
    KARCH=x86 KARGS=ttyS0 VMLINUX=arch/x86/boot/bzImage
    KCONF=$KCONF,UNWINDER_FRAME_POINTER,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_INTEL,E1000,SERIAL_8250,SERIAL_8250_CONSOLE,RTC_CLASS
  elif [ "$TARGET" == m68k ]; then
    QEMU="m68k -M q800" KARCH=m68k KARGS=ttyS0 VMLINUX=vmlinux
    KCONF=MMU,M68040,M68KFPU_EMU,MAC,SCSI_MAC_ESP,MACINTOSH_DRIVERS,ADB,ADB_MACII,NET_CORE,MACSONIC,SERIAL_PMACZILOG,SERIAL_PMACZILOG_TTYS,SERIAL_PMACZILOG_CONSOLE
  elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ]; then
    QEMU="mips -M malta" KARCH=mips KARGS=ttyS0 VMLINUX=vmlinux
    KCONF=MIPS_MALTA,CPU_MIPS32_R2,SERIAL_8250,SERIAL_8250_CONSOLE,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_AMD,PCNET32,POWER_RESET,POWER_RESET_SYSCON
    [ "$TARGET" == mipsel ] && KCONF=$KCONF,CPU_LITTLE_ENDIAN &&
      QEMU="mipsel -M malta"
  elif [ "$TARGET" == powerpc ]; then
    KARCH=powerpc QEMU="ppc -M g3beige" KARGS=ttyS0 VMLINUX=vmlinux
    KCONF=ALTIVEC,PPC_PMAC,PPC_OF_BOOT_TRAMPOLINE,IDE,IDE_GD,IDE_GD_ATA,BLK_DEV_IDE_PMAC,BLK_DEV_IDE_PMAC_ATA100FIRST,MACINTOSH_DRIVERS,ADB,ADB_CUDA,NET_VENDOR_NATSEMI,NET_VENDOR_8390,NE2K_PCI,SERIO,SERIAL_PMACZILOG,SERIAL_PMACZILOG_TTYS,SERIAL_PMACZILOG_CONSOLE,BOOTX_TEXT
  elif [ "$TARGET" == powerpc64le ]; then
    KARCH=powerpc QEMU="ppc64 -M pseries -vga none" KARGS=/dev/hvc0
    VMLINUX=vmlinux
    KCONF=PPC64,PPC_PSERIES,CPU_LITTLE_ENDIAN,PPC_OF_BOOT_TRAMPOLINE,BLK_DEV_SD,SCSI_LOWLEVEL,SCSI_IBMVSCSI,ATA,NET_VENDOR_IBM,IBMVETH,HVC_CONSOLE,PPC_TRANSACTIONAL_MEM,PPC_DISABLE_WERROR,SECTION_MISMATCH_WARN_ONLY
  elif [ "$TARGET" = s390x ]; then
    QEMU="s390x" KARCH=s390 VMLINUX=arch/s390/boot/bzImage
    KCONF=MARCH_Z900,PACK_STACK,NET_CORE,VIRTIO_NET,VIRTIO_BLK,SCLP_TTY,SCLP_CONSOLE,SCLP_VT220_TTY,SCLP_VT220_CONSOLE,S390_GUEST
  elif [ "$TARGET" == sh2eb ]; then
    KARCH=sh VMLINUX=vmlinux KERNEL_CONFIG='CONFIG_MEMORY_START=0x10000000
CONFIG_CMDLINE="console=ttyUL0 earlycon"' BUILTIN=1
    KCONF=CPU_SUBTYPE_J2,CPU_BIG_ENDIAN,SH_JCORE_SOC,SMP,BINFMT_ELF_FDPIC,JCORE_EMAC,SERIAL_UARTLITE,SERIAL_UARTLITE_CONSOLE,HZ_100,CMDLINE_OVERWRITE,SPI,SPI_JCORE,MMC,PWRSEQ_SIMPLE,MMC_BLOCK,MMC_SPI
  elif [ "$TARGET" == sh4 ]; then
    QEMU="sh4 -M r2d -serial null -serial mon:stdio" KARCH=sh
    KARGS="ttySC1 noiotrap" VMLINUX=arch/sh/boot/zImage
    KERNEL_CONFIG="CONFIG_MEMORY_START=0x0c000000"
    KCONF=CPU_SUBTYPE_SH7751R,MMU,VSYSCALL,SH_FPU,SH_RTS7751R2D,RTS7751R2D_PLUS,SERIAL_SH_SCI,SERIAL_SH_SCI_CONSOLE,PCI,NET_VENDOR_REALTEK,8139CP,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,PATA_PLATFORM,BINFMT_ELF_FDPIC,BINFMT_FLAT
#see also SPI SPI_SH_SCI MFD_SM501 RTC_CLASS RTC_DRV_R9701 RTC_DRV_SH RTC_HCTOSYS
  else die "Unknown \$TARGET"
  fi

  # Write the qemu launch script
  if [ ! -z "$QEMU" ]; then
    [ -z "$BUILTIN" ] && INITRD="-initrd ${CROSS_BASE}root.cpio.gz"
    echo qemu-system-"$QEMU" '"$@"' $QEMU_MORE -nographic -no-reboot -m 256 \
         -kernel $(basename $VMLINUX) $INITRD \
         "-append \"quiet panic=1 HOST=$TARGET console=$KARGS \$KARGS\"" \
         ${DTB:+-dtb "$(basename "$DTB")"} ";echo -e '\e[?7h'" \
         > "$OUTPUT/qemu-$TARGET.sh" &&
    chmod +x "$OUTPUT/qemu-$TARGET.sh" || exit 1
  fi

  announce "linux-$KARCH"
  pushd "$LINUX" && make distclean && popd &&
  cp -sfR "$LINUX" "$MYBUILD/linux" && pushd "$MYBUILD/linux" &&

  # Write miniconfig
  { echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=$TARGET.miniconf"
    echo -e "# make ARCH=$KARCH -j \$(nproc)\n# boot $VMLINUX\n\n"
    echo "# CONFIG_EMBEDDED is not set"

    # Expand list of =y symbols, first generic then architecture-specific
    for i in BINFMT_ELF,BINFMT_SCRIPT,NO_HZ,HIGH_RES_TIMERS,BLK_DEV,BLK_DEV_INITRD,RD_GZIP,BLK_DEV_LOOP,EXT4_FS,EXT4_USE_FOR_EXT2,VFAT_FS,FAT_DEFAULT_UTF8,MISC_FILESYSTEMS,SQUASHFS,SQUASHFS_XATTR,SQUASHFS_ZLIB,DEVTMPFS,DEVTMPFS_MOUNT,TMPFS,TMPFS_POSIX_ACL,NET,PACKET,UNIX,INET,IPV6,NETDEVICES,NET_CORE,NETCONSOLE,ETHERNET,COMPAT_32BIT_TIME,EARLY_PRINTK,IKCONFIG,IKCONFIG_PROC $KCONF ; do
      echo "# architecture ${X:-independent}"
      sed -E '/^$/d;s/([^,]*)($|,)/CONFIG_\1=y\n/g' <<< "$i"
      X=specific
    done
    [ ! -z "$BUILTIN" ] && echo -e CONFIG_INITRAMFS_SOURCE="\"$OUTPUT/fs\""
    echo "$KERNEL_CONFIG"
  } > "$OUTPUT/miniconfig-$TARGET" &&
  make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG="$OUTPUT/miniconfig-$TARGET" &&

  # Second config pass to remove stupid kernel defaults
  # See http://lkml.iu.edu/hypermail/linux/kernel/1912.3/03493.html
  sed -e 's/# CONFIG_EXPERT .*/CONFIG_EXPERT=y/' -e "$(sed -E -e '/^$/d' \
    -e 's@([^,]*)($|,)@/^CONFIG_\1=y/d;$a# CONFIG_\1 is not set/\n@g' \
       <<< VT,SCHED_DEBUG,DEBUG_MISC,X86_DEBUG_FPU)" -i .config &&
  yes "" | make ARCH=$KARCH oldconfig > /dev/null &&

  # Build kernel. Copy config, device tree binary, and kernel binary to output
  make ARCH=$KARCH CROSS_COMPILE="$CROSS_COMPILE" -j $(nproc) &&
  cp .config "$OUTPUT/linux-fullconfig" || exit 1
  [ ! -z "$DTB" ] && { cp "$DTB" "$OUTPUT" || exit 1 ;}
  cp "$VMLINUX" "$OUTPUT" && cd .. && rm -rf linux && popd || exit 1
fi

# clean up and package root filesystem for initramfs.
[ -z "$BUILTIN" ] && announce "${CROSS_BASE}root.cpio.gz" &&
  (cd "$ROOT" && find . | cpio -o -H newc --no-preserve-owner | gzip) \
    > "$OUTPUT/$CROSS_BASE"root.cpio.gz
rmdir "$MYBUILD" "$BUILD" 2>/dev/null # remove if empty