RESTORE(8) BSD System Manager's Manual RESTORE(8) NNAAMMEE rreessttoorree - restore files or file systems from backups made with dump SSYYNNOOPPSSIISS rreessttoorree _k_e_y [_n_a_m_e _._._.] DDEESSCCRRIIPPTTIIOONN The rreessttoorree command performs the inverse function of dump(8). A full backup of a file system may be restored and subsequent incremental back- ups layered on top of it. Single files and directory subtrees may be re- stored from full or partial backups. RReessttoorree works across a network; to do this see the --ff flag described below. The actions of rreessttoorree are con- trolled by the given kkeeyy, which is a string of characters containing at most one function letter and possibly one or more function modifiers. Other arguments to the command are file or directory names specifying the files that are to be restored. Unless the hh key is specified (see be- low), the appearance of a directory name refers to the files and (recur- sively) subdirectories of that directory. The function portion of the key is specified by one of the following let- ters: rr Restore (rebuild a file system). The target file system should be made pristine with newfs(8), mounted and the user cd'd into the pristine file system before starting the restoration of the initial level 0 backup. If the level 0 restores successfully, the rr key may be used to restore any necessary incremental backups on top of the level 0. The rr key precludes an interactive file ex- traction and can be detrimental to ones health if not used care- fully (not to mention the disk). An example: newfs /dev/rrp0g eagle mount /dev/rp0g /mnt cd /mnt restore rf /dev/rst8 Note that rreessttoorree leaves a file _r_e_s_t_o_r_e_s_y_m_t_a_b_l_e in the root di- rectory to pass information between incremental restore passes. This file should be removed when the last incremental has been restored. RReessttoorree, in conjunction with newfs(8) and dump(8), may be used to modify file system parameters such as size or block size. RR RReessttoorree requests a particular tape of a multi volume set on which to restart a full restore (see the rr key above). This is useful if the restore has been interrupted. xx The named files are read from the given media. If a named file matches a directory whose contents are on the backup and the hh key is not specified, the directory is recursively extracted. The owner, modification time, and mode are restored (if possi- ble). If no file argument is given, then the root directory is extracted, which results in the entire content of the backup be- ing extracted, unless the hh key has been specified. tt The names of the specified files are listed if they occur on the backup. If no file argument is given, then the root directory is listed, which results in the entire content of the backup being listed, unless the hh key has been specified. Note that the tt key replaces the function of the old dumpdir(8) program. ii This mode allows interactive restoration of files from a dump. After reading in the directory information from the dump, rreessttoorree provides a shell like interface that allows the user to move around the directory tree selecting files to be extracted. The available commands are given below; for those commands that re- quire an argument, the default is the current directory. aadddd [_a_r_g] The current directory or specified argument is added to the list of files to be extracted. If a directory is specified, then it and all its descendents are added to the extraction list (unless the hh key is specified on the command line). Files that are on the extraction list are prepended with a ``*'' when they are listed by llss. ccdd _a_r_g Change the current working directory to the specified argument. ddeelleettee [_a_r_g] The current directory or specified argument is delet- ed from the list of files to be extracted. If a di- rectory is specified, then it and all its descendents are deleted from the extraction list (unless the hh key is specified on the command line). The most ex- pedient way to extract most of the files from a di- rectory is to add the directory to the extraction list and then delete those files that are not needed. eexxttrraacctt All the files that are on the extraction list are ex- tracted from the dump. RReessttoorree will ask which volume the user wishes to mount. The fastest way to extract a few files is to start with the last volume, and work towards the first volume. hheellpp List a summary of the available commands. llss [_a_r_g] List the current or specified directory. Entries that are directories are appended with a ``/''. En- tries that have been marked for extraction are prepended with a ``*''. If the verbose key is set the inode number of each entry is also listed. ppwwdd Print the full pathname of the current working direc- tory. qquuiitt Restore immediately exits, even if the extraction list is not empty. sseettmmooddeess All the directories that have been added to the ex- traction list have their owner, modes, and times set; nothing is extracted from the dump. This is useful for cleaning up after a restore has been prematurely aborted. vveerrbboossee The sense of the vv key is toggled. When set, the verbose key causes the llss command to list the inode numbers of all entries. It also causes rreessttoorree to print out information about each file as it is ex- tracted. The following characters may be used in addition to the letter that se- lects the function desired. bb The next argument to rreessttoorree is used as the block size of the me- dia (in kilobytes). If the --bb option is not specified, rreessttoorree tries to determine the media block size dynamically. ff The next argument to rreessttoorree is used as the name of the archive instead of _/_d_e_v_/_r_m_t_?. If the name of the file is of the form ``host:file'', rreessttoorree reads from the named file on the remote host using rmt(8). If the name of the file is `--', rreessttoorree reads from standard input. Thus, dump(8) and rreessttoorree can be used in a pipeline to dump and restore a file system with the command dump 0f - /usr | (cd /mnt; restore xf -) hh RReessttoorree extracts the actual directory, rather than the files that it references. This prevents hierarchical restoration of com- plete subtrees from the dump. mm RReessttoorree will extract by inode numbers rather than by file name. This is useful if only a few files are being extracted, and one wants to avoid regenerating the complete pathname to the file. ss The next argument to rreessttoorree is a number which selects the file on a multi-file dump tape. File numbering starts at 1. vv Normally rreessttoorree does its work silently. The vv (verbose) key causes it to type the name of each file it treats preceded by its file type. yy RReessttoorree will not ask whether it should abort the restore if gets an error. It will always try to skip over the bad block(s) and continue as best it can. DDIIAAGGNNOOSSTTIICCSS Complaints about bad key characters. Complaints if it gets a read error. If yy has been specified, or the user responds `y', rreessttoorree will attempt to continue the restore. If a backup was made using more than one tape volume, rreessttoorree will notify the user when it is time to mount the next volume. If the xx or ii key has been specified, rreessttoorree will also ask which volume the user wishes to mount. The fastest way to extract a few files is to start with the last volume, and work towards the first volume. There are numerous consistency checks that can be listed by rreessttoorree. Most checks are self-explanatory or can ``never happen''. Common errors are given below. Converting to new file system format. A dump tape created from the old file system has been loaded. It is automatically converted to the new file system format. <filename>: not found on tape The specified file name was listed in the tape directory, but was not found on the tape. This is caused by tape read errors while looking for the file, and from using a dump tape created on an active file system. expected next file <inumber>, got <inumber> A file that was not listed in the directory showed up. This can occur when using a dump created on an active file system. Incremental dump too low When doing incremental restore, a dump that was written before the previous incremental dump, or that has too low an incremental level has been loaded. Incremental dump too high When doing incremental restore, a dump that does not begin its coverage where the previous incremental dump left off, or that has too high an incremental level has been loaded. Tape read error while restoring <filename> Tape read error while skipping over inode <inumber> Tape read error while trying to resynchronize A tape (or other media) read error has occurred. If a file name is specified, then its contents are probably partially wrong. If an inode is being skipped or the tape is trying to resynchronize, then no extracted files have been corrupted, though files may not be found on the tape. resync restore, skipped <num> blocks After a dump read error, rreessttoorree may have to resynchronize it- self. This message lists the number of blocks that were skipped over. FFIILLEESS /dev/rmt? the default tape drive /tmp/rstdir* file containing directories on the tape. /tmp/rstmode* owner, mode, and time stamps for directories. ./restoresymtable information passed between incremental restores. SSEEEE AALLSSOO dump(8), newfs(8), mount(8), mkfs(8), rmt(8) BBUUGGSS RReessttoorree can get confused when doing incremental restores from dump that were made on active file systems. A level zero dump must be done after a full restore. Because restore runs in user code, it has no control over inode allocation; thus a full restore must be done to get a new set of directories reflecting the new inode numbering, even though the contents of the files is unchanged. HHIISSTTOORRYY The rreessttoorree command appeared in 4.2BSD. 4th Berkeley Distribution June 5, 1993 4