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Module for processing and ordering mount configurations for website isolation.
This module handles the logic for ordering mounts with proper parent-child
relationships, remounting parents after children, and adding mkdir attributes
when paths are inside tmpfs mounts.
Optimization: tmpfs mounts that are inside another tmpfs are skipped because
the parent tmpfs already makes them inaccessible.
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Build the parent-child tree structure from docroots.
Call this once and pass the result to process_ordered_mounts() for each
active docroot to avoid rebuilding the tree on every call.
Args:
all_docroots: Set of all docroot paths
Returns:
DocrootTree structure to pass to process_ordered_mounts()
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Process docroots and return ordered mounts list.
Mounts are generated to a fake home directory structure. The active docroot
is mounted from its real path to the corresponding path inside the fake home.
Other docroots are hidden with tmpfs mounts in the fake home.
Rules:
1. Only one record is marked as "docroot" (the active_docroot)
2. Parents must be mounted before children
3. If parent is mounted first, it must be rw mount with remount to ro after all child records mounted
4. If path is inside another path that we marked as tmpfs, we must add mkdir attribute
Args:
active_docroot: The docroot that should be marked as "docroot" in the output
tree: Pre-computed DocrootTree from build_docroot_tree()
uid: User ID for tmpfs mounts
gid: Group ID for tmpfs mounts
Returns:
List of MountEntry in the correct order
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