calmsacibis995
49 lines
2.2 KiB
Plaintext
49 lines
2.2 KiB
Plaintext
There are some rather sticky problems about what to do with respect to
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file ownerships on extracted files. In general there are two cases:
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===========================================================================
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Restore ownership to numeric Set ownership to uid of user
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uid stored in archive running bru
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----------------------------- -----------------------------
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Works properly for system files Fails miserably, with possible
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when doing restoration from system disaster, for system files.
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backups.
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Root permissions can be used to give There is no way for root to easily
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all the files to a single user. give all the files back to their
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(Easy to correct ownerships if other original owners. (Hard to correct
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case is the desired case) if other case is desired case).
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Not desirable for archives imported Most convenient for archives imported
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from foreign systems, where numeric from foreign systems, since all files
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uids are likely to be completely will be owned by user doing extract.
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different.
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Is analogous to handling of other Would imply that other file attributes
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file attributes such as group, mode, should be also set to user defaults.
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dates, etc. These are restored to the Specifically, mode should be modified
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original state. by umask, date should be current date,
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etc. Bru already does some twiddling
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with the file attributes, for security
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purposes. For example, suid programs
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do not have their suid bits preserved
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except when bru is run by root or the
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file owner.
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===========================================================================
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Note that we really need both cases, selectable by the user running
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bru. The only real choice then, is which one to make the default.
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It seems logical that the default should be the case which is most
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often correct, and which is easiest to correct if a mistake is made.
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From the comparison chart, it is apparent that the first case (restore
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ownerships to recorded numeric uid's) is the most desirable.
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Thus, the default is to restore everything as recorded in the archive,
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with the exception of obvious security problems like suid programs. A
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special flag is provided (-C) to make importing archive from other systems
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less painful.
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