/lib/init/tmpfs.sh is in initscripts 2.88dsf-59.9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Set tmpfs vars
#
# Get size of physical RAM in kiB
ram_size ()
{
[ -r /proc/meminfo ] && \
grep MemTotal /proc/meminfo | \
sed -e 's;.*[[:space:]]\([0-9][0-9]*\)[[:space:]]kB.*;\1;' || :
}
# Get size of swap space in kiB
swap_size ()
{
[ -r /proc/meminfo ] && \
grep SwapTotal /proc/meminfo | \
sed -e 's;.*[[:space:]]\([0-9][0-9]*\)[[:space:]]kB.*;\1;' || :
}
#
# Get total VM size in kiB. Prints nothing if no RAM and/or swap was
# detectable.
#
vm_size ()
{
RAM=$(ram_size)
SWAP=$(swap_size)
RAM="${RAM:=0}"
SWAP="${SWAP:=0}"
echo $((RAM + SWAP))
return 0;
}
#
# Get size of tmpfs. If the size is absolute or a percentage, return
# that unchanged. If suffixed with "%VM", return the absolute size as
# a percentage of RAM and swap combined. If no swap was available,
# return as a percentage (tmpfs will use a percentage of RAM only).
#
tmpfs_size_vm ()
{
# Handle the no-swap case here, i.e. core memory only. Also handle no
# memory either (no proc) by just returning the original value.
RET="$1"
VMTOTAL="$(vm_size)"
VMPCT="${RET%\%VM}"
if [ "$VMPCT" != "$RET" ]; then
if [ -n "$VMTOTAL" ]; then
RET=$(((VMTOTAL / 100) * VMPCT))
RET="${RET}k"
else
RET="${VMPCT}%"
fi
fi
echo "$RET"
}
# Free space on /tmp in kiB.
tmp_free_space ()
{
LC_ALL=C df -kP /tmp | grep -v Filesystem | sed -e 's;^[^[:space:]][^[:space:]]*[[:space:]][[:space:]]*[0-9][0-9]*[[:space:]][[:space:]]*[0-9][0-9]*[[:space:]][[:space:]]*\([0-9][0-9]*\)[[:space:]][[:space:]]*.*$;\1;'
}
# Check if an emergency tmpfs is needed
need_overflow_tmp ()
{
[ "$VERBOSE" != no ] && log_action_begin_msg "Checking minimum space in /tmp"
ROOT_FREE_SPACE=$(tmp_free_space)
[ "$VERBOSE" != no ] && log_action_end_msg 0
if [ -n "$ROOT_FREE_SPACE" ] && [ -n "$TMP_OVERFLOW_LIMIT" ] \
&& [ $((ROOT_FREE_SPACE < TMP_OVERFLOW_LIMIT)) = "1" ]; then
return 0
fi
return 1
}
# Set defaults for /etc/default/tmpfs, in case any options are
# commented out which are needed for booting. So that an empty or
# outdated file missing newer options works correctly, set the default
# values here.
RAMLOCK=yes
# These might be overridden by /etc/default/rcS
if [ -z "$RAMSHM" ]; then RAMSHM=yes; fi
if [ -z "$RAMTMP" ]; then RAMTMP=no; fi
TMPFS_SIZE=20%VM
TMPFS_MODE=755
RUN_SIZE=10%
RUN_MODE=755
LOCK_SIZE=5242880 # 5MiB
LOCK_MODE=1777
SHM_SIZE=
SHM_MODE=1777
TMP_SIZE=
TMP_MODE=1777
TMP_OVERFLOW_LIMIT=1024
# Source conffile
if [ -f /etc/default/tmpfs ]; then
. /etc/default/tmpfs
fi
TMPFS_SIZE="$(tmpfs_size_vm "$TMPFS_SIZE")"
RUN_SIZE="$(tmpfs_size_vm "$RUN_SIZE")"
LOCK_SIZE="$(tmpfs_size_vm "$LOCK_SIZE")"
SHM_SIZE="$(tmpfs_size_vm "$SHM_SIZE")"
TMP_SIZE="$(tmpfs_size_vm "$TMP_SIZE")"
RUN_OPT=
[ "${RUN_SIZE:=$TMPFS_SIZE}" ] && RUN_OPT=",size=$RUN_SIZE"
[ "${RUN_MODE:=$TMPFS_MODE}" ] && RUN_OPT="$RUN_OPT,mode=$RUN_MODE"
LOCK_OPT=
[ "${LOCK_SIZE:=$TMPFS_SIZE}" ] && LOCK_OPT=",size=$LOCK_SIZE"
[ "${LOCK_MODE:=$TMPFS_MODE}" ] && LOCK_OPT="$LOCK_OPT,mode=$LOCK_MODE"
SHM_OPT=
[ "${SHM_SIZE:=$TMPFS_SIZE}" ] && SHM_OPT=",size=$SHM_SIZE"
[ "${SHM_MODE:=$TMPFS_MODE}" ] && SHM_OPT="$SHM_OPT,mode=$SHM_MODE"
TMP_OPT=
[ "${TMP_SIZE:=$TMPFS_SIZE}" ] && TMP_OPT=",size=$TMP_SIZE"
[ "${TMP_MODE:=$TMPFS_MODE}" ] && TMP_OPT="$TMP_OPT,mode=$TMP_MODE"
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