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97 lines
2.6 KiB
97 lines
2.6 KiB
#!/bin/sh
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# analyze free space, preferring tmpfs over really many gigaz
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# and taking into account configured hasher workdir prefices
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# NB: use BUILDDIR to override autodetection (see ../QUICKSTART)
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# hope there aren't spaces in RM's $HOME are they?
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DIRS="$TMP $TMPDIR $HOME/hasher /tmp /var/tmp .."
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MINSIZE=262144 # face control criterion
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# mkimage needs /proc among those, be clear about that
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check_allowed_mountpoints()
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{
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grep -wqs "^allowed_mountpoints=[^#]*/proc" \
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/etc/hasher-priv/system \
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`/usr/libexec/hasher-priv/getconf.sh`
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}
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# poor man's SourceIfExists()
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try_source() { [ -f "$1" ] && . "$1"; }
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# hasher accepted ones
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get_prefices()
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{
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try_source /etc/hasher-priv/system || exit 1
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try_source `/usr/libexec/hasher-priv/getconf.sh`
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echo "$prefix" | tr ':' '\n' | while read i; do realpath "$i"; done
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}
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# drop candidates that hasher won't handle anyways
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# NB: doesn't take --number into account,
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# prefix lists are defined by the primary configuration
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contemplate_dirs()
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{
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for d in "$@"; do
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D="`realpath "$d"`";
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for p in `get_prefices`; do
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[ "${D#$p}" = "$D" ] || echo "$D";
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done;
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done \
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| uniq # _not_ sort -u
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}
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# hasher emits no meaningful errors regarding those, sigh
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check_options()
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{
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! egrep -q "^$1 $2 .*no(dev|exec)" /proc/mounts
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}
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# pick existing, writeable, >256M free space dirs
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# rank them wrt type: tmpfs > realfs > rootfs
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choose_tmpdir() {
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for i in "$@"; do
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[ -d "$i" -a -w "$i" ] || continue
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echo -n "$i "
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df -PT "$i" | tail -1
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done \
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| sort -unk5 \
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| while read dir dev fstype size used free percent mnt; do
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check_options "$dev" "$mnt" || continue
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[ "$free" -gt "$MINSIZE" ] || continue
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[ "$fstype" = "tmpfs" ] && { echo "2 $dir $free"; continue; }
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[ "$mnt" = "/" ] && { echo "0 $dir $free"; continue; }
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echo "1 $dir $free"
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done \
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| sort -n \
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| tail -1 \
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| cut -f2 -d' '
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}
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# bringing it all together
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if ! check_allowed_mountpoints; then
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echo "error: hasher's allowed_mountpoints do not include /proc;"
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echo "please check hasher docs and /etc/hasher-priv/system"
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exit 1
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fi >&2
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TMPDIRS="`contemplate_dirs $DIRS`"
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if [ -z "$TMPDIRS" ]; then
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echo "error: no suitable directories found;"
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echo "please check QUICKSTART, filesystem and hasher setup"
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echo "(mount enough tmpfs into /tmp or fix hasher-priv prefix?)"
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exit 1
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fi >&2
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TEMP="`choose_tmpdir $TMPDIRS`"
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if [ -z "$TEMP" ]; then
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echo "error: no suitable directories found;"
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echo "please check hasher docs and filesystem setup"
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echo "(nodev and/or noexec on an otherwise suitable filesystem?)"
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exit 1
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fi >&2
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DIR="$TEMP/`dirname "$1"`"
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NAME="`basename "${1:-tmpdir}"`"
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mkdir -p "$DIR" # in case $1 contains slash(es)
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mktemp -d "$NAME.XXXXXXX" --tmpdir="${DIR%/.}"
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