94 lines
2.9 KiB
Bash
Executable File
94 lines
2.9 KiB
Bash
Executable File
#!/bin/sh -e
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#
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# 2014 Daniel Heule (hda at sfs.biz)
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# 2014 Thomas Oettli (otho at sfs.biz)
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# Copyright 2017, Philippe Gregoire <pg@pgregoire.xyz>
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# 2020 Dennis Camera <dennis.camera at ssrq-sds-fds.ch>
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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# Returns the amount of memory physically installed in the system, or if that
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# cannot be determined the amount available to the operating system kernel,
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# in kibibytes (kiB).
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str2bytes() {
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awk -F' ' '
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$2 == "B" || !$2 { print $1 }
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$2 == "kB" { print $1 * 1000 }
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$2 == "MB" { print $1 * 1000 * 1000 }
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$2 == "GB" { print $1 * 1000 * 1000 * 1000 }
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$2 == "TB" { print $1 * 1000 * 1000 * 1000 * 1000 }
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$2 == "kiB" { print $1 * 1024 }
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$2 == "MiB" { print $1 * 1024 * 1024 }
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$2 == "GiB" { print $1 * 1024 * 1024 * 1024 }
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$2 == "TiB" { print $1 * 1024 * 1024 * 1024 * 1024 }'
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}
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bytes2kib() {
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set -- "$(cat)"
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test "$1" -gt 0 && echo $(($1 / 1024))
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}
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case $(uname -s)
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in
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(Darwin)
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sysctl -n hw.memsize | bytes2kib
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;;
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(FreeBSD)
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sysctl -n hw.realmem | bytes2kib
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;;
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(NetBSD|OpenBSD)
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# NOTE: This reports "usable" memory, not physically installed memory.
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command -p sysctl -n hw.physmem | bytes2kib
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;;
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(SunOS)
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# Make sure that awk from xpg4 is used for the scripts to work
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export PATH="/usr/xpg4/bin:${PATH}"
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prtconf \
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| awk -F ': ' '
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$1 == "Memory size" { sub(/Megabytes/, "MiB", $2); print $2 }
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/^$/ { exit }' \
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| str2bytes \
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| bytes2kib
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;;
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(Linux)
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if test -d /sys/devices/system/memory
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then
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# Use memory blocks if the architecture (e.g. x86, PPC64, s390)
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# supports them (they denote physical memory)
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num_mem_blocks=$(cat /sys/devices/system/memory/memory[0-9]*/state | grep -cxF online)
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mem_block_size=$(cat /sys/devices/system/memory/block_size_bytes)
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echo $((num_mem_blocks * 0x$mem_block_size)) | bytes2kib && exit
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fi
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if test -r /proc/meminfo
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then
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# Fall back to meminfo file on other architectures (e.g. ARM, MIPS,
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# PowerPC)
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# NOTE: This is "usable" memory, not physically installed memory.
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awk -F ': +' '$1 == "MemTotal" { sub(/B$/, "iB", $2); print $2 }' /proc/meminfo \
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| str2bytes \
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| bytes2kib
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fi
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;;
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(*)
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printf "Your kernel (%s) is currently not supported by the memory explorer\n" "$(uname -s)" >&2
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printf "Please contribute an implementation for it if you can.\n" >&2
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exit 1
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;;
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esac
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