dpkg-fsys-usrunmess - Online Linux Manual PageSection : 8
Updated : 2021-04-13
Source : 1.20.9
Note : dpkg suite
NAMEdpkg−fsys−usrunmess − undoes the merged−/usr−via−aliased−dirs mess
SYNOPSIS​dpkg-fsys-usrunmess [option...]
DESCRIPTION​dpkg-fsys-usrunmess is a tool to fix up filesystems that have been installed anew with recent installers with unfortunate defaults or migrated to the broken merged /usr via aliased directories layout, which is not supported by dpkg. See the dpkg FAQ. The program will perform the following overall actions: • Check whether the system needs to be switched, otherwise do nothing, • Check for dpkg database consistency and otherwise abort. • Get the list of files and alternatives that need to be restored. • Create a shadow hierarchy under /.usrunmess, by creating the directories symlinks or hardlinking or copying the files as needed. • Prompt for confirmation before proceeding, if requested on the command-line. • Lock the dpkg database. • Mark all packages as half-configured to force running maintainer scripts that might need to recreate files. • Replace the aliased directories with the shadow ones, by creating a backup of the old symlinked directories and renaming the shadow ones over. • Relabel MAC information for directories and symlinks if necessary. • Reconfigure all packages. • Remove backup symlinks. • Remove old moved objects, but defer directory removal. • Remove old deferred directories that are not referenced by dpkg-query. • Remove shadow root directory. ​Note: When running the program from some shells such as bash (1) or ​zsh (1), after executing it, you might need to request the shell to forget all remembered executable locations with for example hash −r. ​Warning: Note that this operation has the potential to render the system unusable or broken in case of a sudden crash or reboot, unexpected state of the system, or possible bugs in the script. Be prepared with recovery media and consider doing backups beforehand.
OPTIONS−p, −−prompt Prompt at the time of no return, so that the debug output or the shadow hierarchy can be evaluated before proceeding. −n, −−no−act −−dry−run This option enables the dry-run mode, where no destructive action takes place, only the preparatory part. −?, −−help Show the usage message and exit. −−version Show the version and exit.
ENVIRONMENTDPKG_USRUNMESS_NOACT This setting defines whether to enable dry-run mode.
SEE ALSO<https://wiki.debian.org/Teams/Dpkg/FAQ#Q:_Does_dpkg_support_merged−.2Fusr−via−aliased−dirs.3F>. 0
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