pkgdiff-mg: use /var/tmp instead of /tmp as default TMPDIR

pkgdiff can cause large files in the used temprorary directory that
are not cleaned up on exit. Using /tmp for those, which is often a
tmpfs, which means that the files consume main memory at first. Later
the system may move the unused files on the tmpfs into swap.

In any case, using /var/tmp instead of /tmp as default TMPDIR for
pkgdiff-mg is sensible. As a genral rule of thumb, /tmp should be used
for smaller, size bounded files only; /var/tmp for everything else.

Signed-off-by: Florian Schmaus <flow@gentoo.org>

Author: Flowdalic

pkgdiff-mg

@@ -32,7 +32,7 @@ cat2=$(get_category "${2}")
 fn1=${1##*/}
 fn2=${2##*/}
 
-export PORTAGE_TMPDIR="${TMPDIR:-/tmp}"/mgorny-dev-scripts
+export PORTAGE_TMPDIR="${TMPDIR:-/var/tmp}"/mgorny-dev-scripts
 export USE="${USE} test"
 mkdir -p "${PORTAGE_TMPDIR}"
 ebuild "${1}" unpack