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#! /bin/sh
# Use df to find a writable directory on a file system different from that
# of the current directory. If one is found, create a temporary directory
# inside it.
: ${DF=df}
: ${MKDIR=mkdir}
# Try these
: ${CANDIDATE_TMP_DIRS="$TMPDIR /tmp /var/tmp /usr/tmp $HOME"}
other_partition_tmpdir=
# WARNING: using sed like this to extract the mount point will fail
# if the mount point name contains `% '.
dot_mount_point=`$DF --no-sync -P . | sed -n '2s/.*% *//p'`
for d in $CANDIDATE_TMP_DIRS; do
d_mount_point=`$DF --no-sync -P $d | sed -n '2s/.*% *//p'`
# Same partition? Skip it.
test x$d_mount_point = x$dot_mount_point && continue
# See if we can create a directory in it.
if $MKDIR "$d/df-$$" > /dev/null 2>&1; then
other_partition_tmpdir="$d/df-$$"
break
fi
done
if test -z "$other_partition_tmpdir"; then
cat <<EOF 1>&2
**************************************
This test requires a writable directory on a different disk partition,
and I couldn\'t find one. I tried these defaults:
$CANDIDATE_TMP_DIRS
Set your environment variable CANDIDATE_TMP_DIRS to make this test
use a different list.
**************************************
EOF
fi
test "$VERBOSE" = yes && set -x
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