Initramfs » История » Версия 7
Андрей Волков, 2015-08-19 16:51
| 1 | 1 | Андрей Волков | h1. Initramfs |
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| 2 | |||
| 3 | 3 | Андрей Волков | /init |
| 4 | 1 | Андрей Волков | <pre> |
| 5 | #!/bin/busybox sh |
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| 6 | |||
| 7 | # Mount the /proc and /sys filesystems. |
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| 8 | mount -t proc none /proc |
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| 9 | mount -t sysfs none /sys |
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| 10 | |||
| 11 | # Do your stuff here. |
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| 12 | echo "This script mounts rootfs and boots it up, nothing more!" |
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| 13 | |||
| 14 | rescue_shell() { |
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| 15 | echo "Something went wrong. Dropping you to a shell." |
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| 16 | busybox --install -s |
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| 17 | exec /bin/sh |
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| 18 | } |
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| 19 | |||
| 20 | mini_udev() { |
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| 21 | ln -s ../bin/busybox /sbin/mdev |
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| 22 | echo /sbin/mdev > /proc/sys/kernel/hotplug |
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| 23 | /sbin/mdev -s |
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| 24 | } |
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| 25 | |||
| 26 | # Use devtmpfs if possible |
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| 27 | if grep -qs devtmpfs /proc/filesystems; then |
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| 28 | mount -n -t devtmpfs -o "exec,nosuid,mode=0755,size=10M" udev /dev |
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| 29 | devtmpfs=true |
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| 30 | else |
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| 31 | mini_udev |
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| 32 | devtmpfs=false |
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| 33 | fi |
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| 34 | |||
| 35 | uuidlabel_root() { |
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| 36 | for cmd in $(cat /proc/cmdline) ; do |
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| 37 | case $cmd in |
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| 38 | root=*) |
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| 39 | |||
| 40 | 2 | Андрей Волков | mkdir -p /etc/lvm |
| 41 | echo 'devices { filter = [ "a|/dev/md[0-9]+$|", "a|/dev/[hsv]d[a-z][0-9]*$|", "r/.*/" ] }' > /etc/lvm/lvm.conf |
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| 42 | |||
| 43 | 4 | Андрей Волков | echo 'activation { udev_rules = 0 }' >> /etc/lvm/lvm.conf |
| 44 | |||
| 45 | 1 | Андрей Волков | /sbin/lvm vgscan |
| 46 | /sbin/lvm vgchange -ay --sysinit |
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| 47 | |||
| 48 | type=$(echo $cmd | cut -d= -f2) |
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| 49 | if [ $type == "LABEL" ] || [ $type == "UUID" ] ; then |
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| 50 | uuid=$(echo $cmd | cut -d= -f3) |
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| 51 | mount -o ro $(blkid |grep "$type=\"$uuid\"" | cut -d: -f1 | grep -v '/dev/dm-[0-9]*$\|-real$' | sort | head -n1 ) /mnt/root || rescue_shell |
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| 52 | else |
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| 53 | mount -o ro $(echo $cmd | cut -d= -f2) /mnt/root || rescue_shell |
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| 54 | fi |
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| 55 | ;; |
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| 56 | rescue) |
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| 57 | rescue_shell |
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| 58 | ;; |
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| 59 | esac |
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| 60 | done |
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| 61 | } |
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| 62 | |||
| 63 | uuidlabel_root || rescue_shell |
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| 64 | |||
| 65 | # Remount /dev if devtmpfs |
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| 66 | $devtmpfs && mount -n --move /dev /mnt/root/dev |
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| 67 | |||
| 68 | # Clean up. |
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| 69 | umount /proc |
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| 70 | umount /sys |
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| 71 | |||
| 72 | # Boot the real thing. |
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| 73 | exec switch_root /mnt/root /sbin/init |
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| 74 | 3 | Андрей Волков | </pre> |
| 75 | |||
| 76 | 6 | Андрей Волков | h3. Вариант с gzip |
| 77 | |||
| 78 | 3 | Андрей Волков | <pre> |
| 79 | cd initramfs |
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| 80 | find | cpio -o -H newc | gzip -9 > ../initramfs-2012-04-03.igz |
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| 81 | 7 | Андрей Волков | </pre> |
| 82 | 6 | Андрей Волков | |
| 83 | h3. Вариант с xz |
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| 84 | |||
| 85 | 7 | Андрей Волков | <pre> |
| 86 | 6 | Андрей Волков | cd initramfs |
| 87 | find | cpio -o -H newc | xz -v --check=crc32 --x86 --lzma2 > ../initramfs-2015-04-03.ixz |
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| 88 | 1 | Андрей Волков | </pre> |
| 89 | 5 | Андрей Волков | |
| 90 | для сборки i686: |
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| 91 | |||
| 92 | /etc/paludis/bashrc |
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| 93 | |||
| 94 | <pre> |
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| 95 | CC="x86_64-pc-linux-gnu-gcc -m32" |
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| 96 | </pre> |
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| 97 | |||
| 98 | для dropbear --enable-static-nss (glibc) |
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| 99 | |||
| 100 | /etc/paludis/use.conf.d/initramfs.conf |
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| 101 | |||
| 102 | <pre> |
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| 103 | dev-libs/libtommath static-libs |
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| 104 | net-misc/dropbear minimal -pam -shadow static -zlib |
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| 105 | dev-libs/popt static-libs |
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| 106 | net-misc/rsync static -drop_cache -iconv -ipv6 |
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| 107 | sys-fs/lvm2 static -udev |
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| 108 | sys-apps/busybox -ipv6 static |
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| 109 | </pre> |