/usr/share/initramfs-tools/hooks/compcache is in initramfs-tools-core 0.130ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #!/bin/sh
set -e
if [ "$1" = prereqs ]; then
exit 0
fi
. /usr/share/initramfs-tools/hook-functions
number=
suffix=
eval $(printf "%s" "$COMPCACHE_SIZE" | \
sed -nre 's/^ *([1-9][0-9]*) *([%KMGT]) *$/number="\1"; suffix="\2";/p')
if [ -z "$number" ] || [ -z "$suffix" ]; then
exit 0
fi
if have_module zram; then
name=zram
manual_add_modules zram
elif have_module ramzswap; then
name=ramzswap
manual_add_modules ramzswap
elif have_module compcache; then
name=compcache
manual_add_modules compcache
else
exit 0
fi
copy_exec /sbin/swapon
copy_exec /sbin/mkswap
copy_exec /usr/lib/initramfs-tools/bin/rzscontrol /sbin
mem_total="\$(sed -nre 's/^MemTotal:\\s*([0-9]+) kB\$/\\1/p' /proc/meminfo)"
case "$suffix" in
%) kbytes="\$(($mem_total * $number / 100))" ;;
K) kbytes=$(($number)) ;;
M) kbytes=$(($number * 1024)) ;;
G) kbytes=$(($number * 1024 * 1024)) ;;
T) kbytes=$(($number * 1024 * 1024 * 1024)) ;;
esac
cat >"$DESTDIR"/sbin/compcache-enable <<'EOF'
#!/bin/sh
if [ "$#" != 3 ]; then
echo "Usage: $0 <type> <size> <device>" 1>&2
exit 1
fi
type="$1"
size="$2"
device="$3"
number=
suffix=
eval $(printf "%s" "$size" | \
sed -nre 's/^ *([1-9][0-9]*) *([%KMGT]) *$/number="\1"; suffix="\2";/p')
mem_total="$(sed -nre 's/^MemTotal:\s*([0-9]+) kB$/\1/p' /proc/meminfo)"
case "$suffix" in
%) kbytes="$(($mem_total * $number / 100))" ;;
K) kbytes=$(($number)) ;;
M) kbytes=$(($number * 1024)) ;;
G) kbytes=$(($number * 1024 * 1024)) ;;
T) kbytes=$(($number * 1024 * 1024 * 1024)) ;;
esac
bytes="$(($kbytes * 1024))"
if [ "$type" = zram ]; then
echo "$bytes" >/sys/block/$device/disksize && \
/sbin/mkswap "/dev/$device" >/dev/null
elif [ "$type" = ramzswap ]; then
/sbin/rzscontrol "/dev/$device" --disksize_kb="$kbytes" --init
fi
/sbin/swapon -p 100 "/dev/$device" 2>/dev/null
exit 0
EOF
chmod 0755 "$DESTDIR"/sbin/compcache-enable
mkdir -p "$DESTDIR"/etc/udev/rules.d
if [ "$name" = zram ]; then
cat >"$DESTDIR"/etc/udev/rules.d/80-compcache.rules <<EOF
KERNEL=="zram0", ACTION=="add", \\
RUN+="/sbin/compcache-enable zram $COMPCACHE_SIZE zram0"
EOF
elif [ "$name" = ramzswap ]; then
cat >"$DESTDIR"/etc/udev/rules.d/80-compcache.rules <<EOF
KERNEL=="ramzswap0", ACTION=="add", \\
RUN+="/sbin/compcache-enable ramzswap $COMPCACHE_SIZE ramzswap0"
EOF
else
cat >"$DESTDIR"/etc/udev/rules.d/80-compcache.rules <<EOF
KERNEL=="ramzswap0", ACTION=="add", \\
RUN+="/sbin/compcache-enable compcache $COMPCACHE_SIZE ramzswap0"
EOF
fi
cat >"$DESTDIR"/scripts/init-top/compcache <<EOF
#!/bin/sh
PREREQ=""
prereqs()
{
echo "\$PREREQ"
}
case \$1 in
prereqs)
prereqs
exit 0
;;
esac
# find total amount of available ram
TOTAL_RAM=\$( grep MemTotal /proc/meminfo |tr -d ': [A-Z][a-z]')
# Do not use compcache on the liveCD if we have more than 512M
if [ "\${BOOT}" = "casper" ]; then
if [ "\${TOTAL_RAM}" -gt 524288 ]; then
exit 0
fi
fi
for x in \$(cat /proc/cmdline); do
case \${x} in
nocompcache)
exit 0
;;
esac
done
EOF
if [ "$name" = zram ]; then
cat >>"$DESTDIR"/scripts/init-top/compcache <<EOF
modprobe -q --ignore-install zram
EOF
elif [ "$name" = ramzswap ]; then
cat >>"$DESTDIR"/scripts/init-top/compcache <<EOF
modprobe -q --ignore-install ramzswap
EOF
else
cat >>"$DESTDIR"/scripts/init-top/compcache <<EOF
modprobe -q --ignore-install compcache compcache_size_kbytes="$kbytes"
EOF
fi
chmod 0755 "$DESTDIR"/scripts/init-top/compcache
# vim:set et sw=2 sts=2:
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