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diff --git a/usr/share/rear/conf/default.conf b/usr/share/rear/conf/default.conf
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index 9ada92c3..3bdb5497 100644
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--- a/usr/share/rear/conf/default.conf
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+++ b/usr/share/rear/conf/default.conf
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@@ -57,10 +57,16 @@
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#
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# where /prefix/for/rear/working/directory must already exist.
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# This is useful for example when there is not sufficient free space
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-# in /tmp or $TMPDIR for the ISO image or even the backup archive.
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-# TMPDIR cannot be set to a default value here, otherwise /usr/sbin/rear
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+# in /var/tmp or $TMPDIR for the ISO image or even the backup archive.
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+# TMPDIR cannot be set to a default value here unconditionally but only
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+# if it is not set before calling the program, otherwise /usr/sbin/rear
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# would not work in compliance with the Linux/Unix standards regarding TMPDIR
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# see https://github.com/rear/rear/issues/968
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+# The default is /var/tmp instead of the more usual /tmp (the system default),
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+# because /tmp is not intended for such large amounts of data that ReaR usually
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+# produces when creating the image (see file-hierarchy(7)). In particular,
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+# /tmp can be a tmpfs, and thus restricted by the available RAM/swap.
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+export TMPDIR="${TMPDIR-/var/tmp}"
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##
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# ROOT_HOME_DIR
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diff --git a/usr/share/rear/rescue/GNU/Linux/600_unset_TMPDIR_in_rescue_conf.sh b/usr/share/rear/rescue/GNU/Linux/600_unset_TMPDIR_in_rescue_conf.sh
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deleted file mode 100644
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index 84d0cabb..00000000
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--- a/usr/share/rear/rescue/GNU/Linux/600_unset_TMPDIR_in_rescue_conf.sh
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+++ /dev/null
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@@ -1,8 +0,0 @@
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-cat - <<EOF >> "$ROOTFS_DIR/etc/rear/rescue.conf"
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-# TMPDIR variable may be defined in local.conf file as prefix dir for mktemp command
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-# e.g. by defining TMPDIR=/var we would get our BUILD_DIR=/var/tmp/rear.XXXXXXXXXXXX
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-# However, in rescue we want our BUILD_DIR=/tmp/rear.XXXXXXX as we are not sure that
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-# the user defined TMPDIR would exist in our rescue image
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-# by 'unset TMPDIR' we achieve above goal (as rescue.conf is read after local.conf)!
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-unset TMPDIR
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-EOF
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