Changes

;$SUGAR_ACTIVITY_ROOT/data/: This directory is used similar to a traditional home directory, for persistent activity data such as configuration files. Make sure files in there are group readable and writable (see [[#Users and Groups|users and groups]]). The directory itself is group-writable. Files stored here will survive reboots and OS upgrades.

;$SUGAR_ACTIVITY_ROOT/data/: This directory is used similar to a traditional home directory, for persistent activity data such as configuration files. Make sure files in there are group readable and writable (see [[#Users and Groups|users and groups]]). The directory itself is group-writable. Files stored here will survive reboots and OS upgrades.

;$SUGAR_ACTIVITY_ROOT/tmp/: This directory is used similar to a /tmp directory, being backed by RAM. It may be as small as 1 MB. This directory is deleted when the activity exits (specifically,  as soon as all children of the activity's first process die). This directory is ''only'' accessible to the activity and its children; not even to Sugar.

;$SUGAR_ACTIVITY_ROOT/tmp/: This directory is used similar to a /tmp directory, being backed by RAM if [[olpc:Rainbow|Rainbow]] is present. It may be as small as 1 MB. With [[olpc:Rainbow|Rainbow]], this directory is deleted when the activity exits (specifically,  as soon as all children of the activity's first process die). This directory is ''only'' accessible to the activity and its children; not even to Sugar.

;$SUGAR_ACTIVITY_ROOT/instance/: This directory is used similar to a /var/tmp directory, being backed by flash rather than by RAM. It is unique per instance. It is used for transfer to and from the datastore (see [[#Keeping and Resuming|keeping and resuming]]). This directory is deleted when the activity exits (specifically,  as soon as all children of the activity's first process die)

;$SUGAR_ACTIVITY_ROOT/instance/: This directory is used similar to a /var/tmp directory, being backed by flash rather than by RAM. It is unique per instance. It is used for transfer to and from the datastore (see [[#Keeping and Resuming|keeping and resuming]]). With [[olpc:Rainbow|Rainbow]], this directory is deleted when the activity exits (specifically,  as soon as all children of the activity's first process die).

As of version 8.2, all the activity root directories are created in /home/olpc/isolation and can be examined there with the Terminal activity. However, activities MUST use the $SUGAR_ACTIVITY_ROOT variable because the isolation directory layout is expected to change.

As of version 8.2, all the activity root directories are created in /home/olpc/isolation and can be examined there with the Terminal activity. However, activities MUST use the $SUGAR_ACTIVITY_ROOT variable because the isolation directory layout is expected to change.