Use DIB_IMAGE_CACHE everywhere

disk-image-create processes a DIB_IMAGE_CACHE variable and exports it,
but there are several elements that ignore the value and wrote out
the base location themselves. Use the variable everywhere so that it
will get overridden everywhere.

Change-Id: I00fff354d6c931ad67cf3052d055f0e4604dfdc8

elements/base/root.d/01-ccache

@@ -9,7 +9,7 @@ set -o pipefail
 # after automatically pulling in the Ubuntu element)
 grep " $TMP_MOUNT_PATH/tmp/ccache" /proc/mounts && exit
 
-DIB_CCACHE_DIR=${DIB_CCACHE_DIR:-$HOME/.cache/image-create/ccache}
+DIB_CCACHE_DIR=${DIB_CCACHE_DIR:-$DIB_IMAGE_CACHE/ccache}
 mkdir -p $DIB_CCACHE_DIR
 
 sudo mkdir -p $TMP_MOUNT_PATH/tmp/ccache

elements/pip-cache/root.d/01-pip-cache

@@ -3,7 +3,7 @@
 set -eu
 set -o pipefail
 
-PIP_CACHE_DIR=$HOME/.cache/image-create/pip
+PIP_CACHE_DIR=$DIB_IMAGE_CACHE/pip
 mkdir -p $PIP_CACHE_DIR
 
 sudo mkdir -p $TMP_MOUNT_PATH/tmp/pip

elements/pypi/extra-data.d/00-mount-pypi-mirror

@@ -3,7 +3,7 @@
 set -eu
 set -o pipefail
 
-MIRROR_SOURCE=~/.cache/image-create/pypi/mirror/
+MIRROR_SOURCE=$DIB_IMAGE_CACHE/pypi/mirror/
 if [ -d "$MIRROR_SOURCE" ]; then
     MIRROR_TARGET=$TMP_MOUNT_PATH/tmp/pypi
 

elements/source-repositories/extra-data.d/98-source-repositories

@@ -197,8 +197,8 @@ function get_repos_for_element(){
     done < $REPO_SOURCES
 }
 
-CACHE_BASE=~/.cache/image-create/source-repositories
-OLD_CACHE_BASE=~/.cache/image-create/repository-sources
+CACHE_BASE=$DIB_IMAGE_CACHE/source-repositories
+OLD_CACHE_BASE=$DIB_IMAGE_CACHE/repository-sources
 make_new_cache $OLD_CACHE_BASE $CACHE_BASE
 mkdir -p $CACHE_BASE
 # Use the IMAGE_NAME from the calling script, and make it unique with the temporary path

elements/yum/root.d/50-yum-cache

@@ -5,7 +5,7 @@ set -o pipefail
 
 [ -n "$TARGET_ROOT" ]
 
-YUM_CACHE_DIR=~/.cache/image-create/yum
+YUM_CACHE_DIR=$DIB_IMAGE_CACHE/yum
 mkdir -p $YUM_CACHE_DIR
 
 sudo mkdir -p $TMP_MOUNT_PATH/tmp/yum

elements/zypper/root.d/50-zypper-cache

@@ -5,7 +5,7 @@ set -o pipefail
 
 [ -n "$TARGET_ROOT" ]
 
-ZYPPER_CACHE_DIR=~/.cache/image-create/zypper
+ZYPPER_CACHE_DIR=$DIB_IMAGE_CACHE/zypper
 mkdir -p $ZYPPER_CACHE_DIR
 
 sudo mkdir -p $TMP_MOUNT_PATH/var/cache/zypp