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Diffstat (limited to 'recipes/slugos-init/files/functions')
| -rw-r--r-- | recipes/slugos-init/files/functions | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/recipes/slugos-init/files/functions b/recipes/slugos-init/files/functions new file mode 100644 index 0000000000..38a3b4d166 --- /dev/null +++ b/recipes/slugos-init/files/functions @@ -0,0 +1,427 @@ +#!/bin/sh +# . this file to load the following utility functions +# +# hardware +# the 'Hardware' string from cpuinfo +hardware(){ + sed -n 's!^Hardware *: !!p' /proc/cpuinfo +} +# +# machine +# outputs an identifier of the current machine - i.e. the board +# slugos is running on. +machine(){ + case "$(hardware)" in + *Coyote*) echo coyote;; + *IXDPG425*) echo ixdpg425;; + *WRV54G*) echo wrv54g;; + *IXDP425*) echo ixdp425;; + *IXDP465*) echo ixdp465;; + *IXCDP1100*) echo ixcdp1100*;; + *Avila*) echo avila;; + *Loft*) echo loft;; + *NAS?100d*) echo nas100d;; + *DSM?G600*) echo dsmg600;; + *NSLU2*) echo nslu2;; + *FSG?3*) echo fsg3;; + *) echo unknown;; + esac +} +# +# single_user_ok +# if the machine is capable of single user interaction return +# true, else return false. The result of this function is +# preempted by setting SULOGIN to 'yes' or 'ok' in /etc/default/rcS +single_user_ok() { + # list known good machines in the 'case' + test "$SULOGIN" = yes -o "$SULOGIN" = ok || + case "$(machine)" in + ixdp*|avila|loft) + test "$SULOGIN" != never;; + *) return 1;; + esac +} +# +# load_functions "source" +# load the functions in '/sbin/source' - relies on /sbin/source being +# a shell script and having support for this function. +load_functions(){ + test -n "$1" -a -x "/sbin/$1" && . "/sbin/$1" || { + echo "$0: /sbin/$1: script not found" >&2 + return 1 + } +} +# +# mtdev "name" +# return (output) the character device name for flash parition "name" +# /proc/mtd has the general form: +# dev: size erasesize name +# mtd5: 00020000 00020000 "FIS directory" +# use this rather than hard-wiring the device because the partition +# table can change - looking in /proc/mtd is more reliable. +mtdev(){ + sed -n 's!^\(mtd[0-9][0-9]*\):[^"]*"'"$1"'"$!/dev/\1!p' /proc/mtd +} +# +# mtblockdev "name" +# as mtdev but output the name of the block (not character) device +mtblockdev(){ + sed -n 's!^mtd\([0-9][0-9]*\):[^"]*"'"$1"'"$!/dev/mtdblock\1!p' /proc/mtd +} +# +# mtsize "name" +# the size of the partition as a hexadecimal value (with 0x at the front) +mtsize(){ + sed -n 's!^mtd[0-9][0-9]*: \([^ ]*\)[^"]*"'"$1"'"$!0x\1!p' /proc/mtd +} +# +# sysvalmatch "section" "name" 'pattern' "configuration file" +# sysvalof "section" "name" "configuration file" +# sysval "section" "name" +# outputs the value of the SysConf variable 'name' from section 'section', +# if there are multiple definitions only the last is output +# NOTE: these functions should only be used internally, add entries to 'config' +# below if necessary. This is because 'config' does the defaulting. +sysvalmatch(){ + sed -n '/^\['"$1"'\]$/,/^\[.*\]$/s/^'"$2"'=\('"$3"'\)$/\1/p' "$4" | sed -n '$p' +} +sysvalof(){ + sysvalmatch "$1" "$2" '.*' "$3" +} +sysval(){ + test -r "$config_root/etc/default/sysconf" && + sysvalof "$1" "$2" "$config_root/etc/default/sysconf" +} +# +# syssection "section" +# outputs all the values from the given section changed to the format "name value" +# (i.e. the '=' is dropped). +syssection(){ + test -r "$config_root/etc/default/sysconf" && + sed -n '/^\['"$1"'\]$/,/^\[.*\]$/s/^\([^=]*\)=\(.*\)$/\1 \2/p' "$config_root/etc/default/sysconf" +} +# +# config "value" +# convenience callers for specific values to avoid mis-typing in scripts +# NOTE: this function does the defaulting, 'sysval' does not! +# config_root: if set this will override the root where config/sysval +# looks for /etc/default/sysconf +config(){ + local mac + mac="$(test -r /proc/net/maclist && + sed -n '/^[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]$/p' /proc/net/maclist | + sed -n 1p)" + # + case "$1" in + mac) test -n "$mac" && echo "$mac";; + host) if test -n "$(sysval network disk_server_name)" + then + sysval network disk_server_name + elif test -n "$(sysval network default_server_name)" + then + sysval network default_server_name + elif test -n "$mac" + then + echo "$mac" | sed -n 's/^\(..\):\(..\):\(..\):\(..\):\(..\):\(..\)$/slug\1\2\3\4\5\6/p' + else + # because we want the name to remain constant: + echo "brokenslug" + fi;; + domain) sysval network w_d_name;; + iface) if test -n "$(sysval network lan_interface)" + then + sysval network lan_interface + else + echo eth0 + fi;; + ip) if test -n "$(sysval network ip_addr)" + then + sysval network ip_addr + else + echo 192.168.1.77 + fi;; + netmask)sysval network netmask;; + gateway)sysval network gateway;; + dns) sysval network dns_server1;; + dns2) sysval network dns_server2;; + dns3) sysval network dns_server3;; + boot) if test -n "$(sysval network bootproto)" + then + sysval network bootproto + else + echo dhcp + fi;; + valid) test -r "$config_root/etc/default/sysconf" -a -n "$mac";; + *) return 1;; + esac +} +# +# checkif "iface" +# Validate an interface name by making sure that it exists +# in /proc/net/dev (and is not lo). The listing outputs the +# interface followed by a :, the check function looks for +# something of the form '$1[a-zA-Z0-9]*:' and outputs the +# part preceding the ':' +checkif(){ + sed -n '/^[ ]*lo:/d;s/^[ ]*\('"$1"'[a-zA-Z0-9]*\):.*$/\1/p;tE;d;:E;q' /proc/net/dev +} +# +# checkmount "mountpoint" +# tests an already mounted mountpoint to see whether to attempt to +# boot with this as root. Returns success if it appears ok. +checkmount(){ + # basic test for init (the kernel will try to load this) + # but require a shell in bin/sh too + test \( -d "$1/mnt" \) -a \ + \( -d "$1/dev" \) -a \ + \( -x "$1/bin/sh" -o -h "$1/bin/sh" \) -a \ + \( -x "$1/usr/sbin/chroot" -o -h "$1/usr/sbin/chroot" -o \ + -x "$1/sbin/chroot" -o -h "$1/sbin/chroot" \) -a \ + \( -x "$1/sbin/init" -o -h "$1/sbin/init" -o \ + -x "$1/etc/init" -o -h "$1/etc/init" -o \ + -x "$1/bin/init" -o -h "$1/bin/init" \) +} +# +# minimaldevnodes "mountpoint" +# tests an already mounted mountpoint to see if a very minimal +# set of devices exists or can be created in dev, and returns +# failure if not. This is required for booting to an nfsroot +# with an empty dev directory, as commonly occurs when the rootfs +# is created from a tar.gz image. This is also required for mdev. +minimaldevnodes(){ + [ -c "$1/dev/console" ] || mknod -m 600 "$1/dev/console" c 5 1 || return 1 + [ -c "$1/dev/null" ] || mknod -m 666 "$1/dev/null" c 1 3 || return 1 + [ -c "$1/dev/tty0" ] || mknod -m 644 "$1/dev/tty0" c 4 0 || return 1 + return 0 +} +# +# swivel "new root" "old root" +# NOTE: the arguments must be paths relative to /, bad things +# will happen if the arguments themselves start with / +# Pivot to a new root. This does all the fancy pivot_root stuff +# including closing streams and does a umount of /proc and /sys - +# it doesn't matter if this fails (failure codes are ignored), +# but if /proc and/or /sys was mounted it must be restored by the +# caller on return. Normally this function never returns! +# On return 0,1,2 are connected to /dev/console - this may not +# have been true before! +swivel(){ + cd "$1" + exec <&- >&- 2>&- + # This is just-in-case the caller mounted either /proc or + # /sys, and was unable to close them + umount /sys 2>/dev/null + umount /proc 2>/dev/null + if pivot_root . "$2" + then + # everything must move out of the old root, this process + # is $2/bin/sh so it must die, IO is redirected + # just in case - typically it will be to a device so it + # won't hold the old root open. + # the exec here is the first point at which the old root + # is unused - before the exec regardless of the close of + # 0,1,2 above ash still has *this* shell script open! + # (it's on fd 10). + # init closes all file descriptors, there's no point + # supplying it with fds. + # NOTE: this used to use $2/usr/sbin/chroot, however on + # linux / is already . when the command is executed + # therefore it is essential to use the local (new root) + # chroot to ensure it gets the correct shared libraries. + if test -x usr/sbin/chroot -o -h usr/sbin/chroot + then + chroot=usr/sbin/chroot + elif test -x sbin/chroot -o -h sbin/chroot + then + chroot=sbin/chroot + else + chroot=chroot + fi + # + exec "$chroot" . bin/sh -c "\ + test -x sbin/init && exec sbin/init + test -x etc/init && exec etc/init + test -x bin/init && exec bin/init + # Problematic failure! The chroot worked, but the + # exec failed. Nothing to do but blink the LEDs. + # (Use a wildcard because the LED names depend on + # the version of the kernel in use.) + mount -t sysfs sysfs /mnt + for i in /mnt/class/leds/*[ready\|status] + do + echo -n timer >$i/trigger + echo -n 60 >$i/delay_on + echo -n 30 >$i/delay_off + done + umount /mnt + sync;sync;sync + exit 1" + fi + # + # recovery - must restore the old root + cd "$2" + sbin/pivot_root . "$1" + # cd is back to $1 - either pivot_root doesn't change it and the + # chroot above was not executed, or pivot_root does change it and + # has just changed it back! + exec <>/dev/console >&0 2>&0 +} +# +# ifup "interface" +# bring that interface up with the configured ip and other +# information +ifup(){ + local ip hostname router subnet iface HOSTNAME NETMASK BROADCAST + + iface="$1" + ip="$(config ip)" + hostname="$(config host)" + router="$(config gateway)" + broadcast= + + if test -n "$ip" + then + # only if an ip was specified + subnet="$(config netmask)" + else + ip=192.168.1.77 + fi + + # First try udhcpc - note that the /boot/udhcpc.script + # simply records the values returned and the udhcpc + # is not left running so this will only work for + # the lease length time! + ifconfig "$iface" up + if test "$(config boot)" != static + then + test -n "$hostname" && HOSTNAME="-H $hostname" + # Pause a moment in case link negotiation takes a while + sleep 3 + # The script writes the required shell variable assignments + # to file descriptor 9 + eval $(udhcpc -i "$iface" -n -q -r "$ip" $HOSTNAME -s /boot/udhcpc.script 9>&1 >/dev/null) + fi + + test -n "$broadcast" && BROADCAST="broadcast $broadcast" + test -n "$subnet" && NETMASK="netmask $subnet" + + if ifconfig "$iface" "$ip" $NETMASK $BROADCAST + then + for route in $router + do + route add default gw "$route" dev "$iface" + done + return 0 + else + ifconfig "$iface" down + return 1 + fi +} +# +# ifdown "interface" +# take the interface down +ifdown(){ + ifconfig "$1" down +} +# +# mountflash "flash device" "flash root directory" {mount options} +# Finds and mounts the flash file system on the given directory +mountflash(){ + local ffsdev ffsdir + + ffsdev="$1" + test -n "$ffsdev" -a -b "$ffsdev" || { + echo "$0: unable to find flash file system to copy ($ffsdev)" >&2 + return 1 + } + shift + + ffsdir="$1" + test -n "$ffsdir" -a -d "$ffsdir" || { + echo "$0: mountflash $ffsdir: not a directory (internal error)" >&2 + return 1 + } + shift + + mount -t jffs2 "$@" "$ffsdev" "$ffsdir" || { + echo "$0: $ffsdev: unable to mount flash file system on $ffsdir" >&2 + return 1 + } + return 0 +} +# +# umountflash [-r] "flash device" +# unmount any instance of the given flash device, if -r is specified a mount on +# root is an error, otherwise a mount on root is ignored (and remains). +umountflash(){ + local rootok ffsno ffsdev + rootok=1 + case "$1" in + -r) rootok= + shift;; + esac + # + # The argument is ffsdev + ffsdev="$1" + ffsno="$(devio "<<$ffsdev" prd)" + test -n "$ffsno" -a "$ffsno" -ge 0 || { + echo "$0: $ffsdev: device number $ffsno is not valid, cannot continue." >&2 + return 1 + } + # + # Make sure that Flashdisk isn't mounted on / + if test -z "$rootok" -a "$(devio "<</etc/init.d/sysconfsetup" prd)" -eq "$ffsno" + then + echo "$0: $ffsdev is mounted on /, use turnup ram" >&2 + return 1 + fi + # + # The function is currently always used interactively, so output + echo "$0: umounting any existing mount of $ffsdev" >&2 + # + # check each mount point, do this last first because otherwise nested + # mounts of ffsdev cannot be umounted. + ffs_umount() { + local device mp type options stuff + + read device mp type options stuff + test -z "$device" && return 0 + + # handle following entries first + ffs_umount || return 1 + + # handle this entry, since this is currently only used for unmounting + # the flash root partition we know a file which must exist... + case "$mp/$type" in + //jffs2);; # skip / + */jffs2)test "$(devio "<<$mp/etc/init.d/sysconfsetup" prd 2>/dev/null)" -ne "$ffsno" || + umount "$mp" || { + echo "$0: $mp: unable to umount $ffsdev" >&2 + return 1 + };; + esac + + return 0 + } + # + ffs_umount </proc/mounts || { + echo "$0: umount $ffsdev from all mount points then re-run $0" >&2 + return 1 + } + + return 0 +} + +# +# uuid_by_partition +# output a list of partitions and their UUIDs +uuid_by_partition() { + blkid -c /dev/null -s UUID | sed -n 's/^\([^:]*\): .*UUID="\([^"]*\)".*$/\1 \2/p' +} + +# +# partition_of uuid +# return the partition corresponding to the UUID +partition_of() { + sed -n 's/^\([^ ]*\) '"$1"'$/\1/p' +} |