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| -rw-r--r-- | doc/tarlz.info | 78 |
1 files changed, 49 insertions, 29 deletions
diff --git a/doc/tarlz.info b/doc/tarlz.info index fc1f092..f49bb43 100644 --- a/doc/tarlz.info +++ b/doc/tarlz.info @@ -11,7 +11,7 @@ File: tarlz.info, Node: Top, Next: Introduction, Up: (dir) Tarlz Manual ************ -This manual is for Tarlz (version 0.14, 12 March 2019). +This manual is for Tarlz (version 0.15, 11 April 2019). * Menu: @@ -59,7 +59,8 @@ archive, but it has the following advantages: parallel, multiplying the decompression speed. * New members can be appended to the archive (by removing the EOF - member) just like to an uncompressed tar archive. + member), and unwanted members can be deleted from the archive. Just + like an uncompressed tar archive. * It is a safe posix-style backup format. In case of corruption, tarlz can extract all the undamaged members from the tar.lz @@ -88,8 +89,11 @@ The format for running tarlz is: tarlz [OPTIONS] [FILES] -On archive creation or appending tarlz archives the files specified, but -removes from member names any leading and trailing slashes and any +All operations except '--concatenate' operate on whole trees if any +FILE is a directory. + + On archive creation or appending tarlz archives the files specified, +but removes from member names any leading and trailing slashes and any filename prefixes containing a '..' component. On extraction, leading and trailing slashes are also removed from member names, and archive members containing a '..' component in the filename are skipped. Tarlz @@ -176,6 +180,15 @@ equivalent to '-1 --solid' Make '--diff' ignore differences in owner and group IDs. This option is useful when comparing an '--anonymous' archive. +'--delete' + Delete the specified files and directories from an archive in + place. It currently can delete only from uncompressed archives and + from archives with individually compressed files ('--no-solid' + archives). To delete a directory without deleting the files under + it, use 'tarlz --delete -f foo --exclude='dir/*' dir'. Deleting in + place may be dangerous. A corrupt archive, a power cut, or an I/O + error may cause data loss. + '--exclude=PATTERN' Exclude files matching a shell pattern like '*.o'. A file is considered to match if any component of the filename matches. For @@ -240,8 +253,10 @@ equivalent to '-1 --solid' '-x' '--extract' - Extract files from an archive. If FILES are given, extract only - the FILES given. Else extract all the files in the archive. + Extract files from an archive. If FILES are given, extract only the + FILES given. Else extract all the files in the archive. To extract + a directory without extracting the files under it, use + 'tarlz -xf foo --exclude='dir/*' dir'. '-0 .. -9' Set the compression level for '--create' and '--append'. The @@ -597,7 +612,7 @@ characters in the array contain non-null characters including the last character. Each numeric field contains a leading space- or zero-filled, optionally null-terminated octal number using digits from the ISO/IEC 646:1991 (ASCII) standard. Tarlz is able to decode numeric fields 1 -byte larger than standard ustar by not requiring a terminating null +byte longer than standard ustar by not requiring a terminating null character. @@ -607,10 +622,10 @@ File: tarlz.info, Node: Amendments to pax format, Next: Multi-threaded tar, P ****************************************** Tarlz is meant to reliably detect invalid or corrupt metadata during -extraction and to not create safety risks in the archives it creates. In -order to achieve these goals, tarlz makes some changes to the variant -of the pax format that it uses. This chapter describes these changes -and the concrete reasons to implement them. +decoding, and to create safe archives where corrupt metadata can be +reliably detected. In order to achieve these goals, tarlz makes some +changes to the variant of the pax format that it uses. This chapter +describes these changes and the concrete reasons to implement them. 4.1 Add a CRC of the extended records @@ -659,9 +674,9 @@ overridden by extended records. size larger than 8 GiB or a link name longer than 100 bytes), tarlz moves the filename also to the extended header to prevent an ustar tool from trying to extract the file or link. This also makes easier during -parallel extraction or listing the detection of a tar member split -between two lzip members at the boundary between the extended header -and the ustar header. +parallel decoding the detection of a tar member split between two lzip +members at the boundary between the extended header and the ustar +header. 4.3 As simple as possible (but not simpler) @@ -673,6 +688,10 @@ of a file exceed the limits of the ustar format. Adding extended headers to each member just to record subsecond timestamps seems wasteful for a backup format. + Global pax headers are tolerated, but not supported; they are parsed +and ignored. Some operations may not behave as expected if the archive +contains global headers. + 4.4 Avoid misconversions to/from UTF-8 ====================================== @@ -817,9 +836,10 @@ Example 6: Extract all files from archive 'archive.tar.lz'. tarlz -xf archive.tar.lz -Example 7: Extract files 'a' and 'c' from archive 'archive.tar.lz'. +Example 7: Extract files 'a' and 'c', and the whole tree under +directory 'dir1' from archive 'archive.tar.lz'. - tarlz -xf archive.tar.lz a c + tarlz -xf archive.tar.lz a c dir1 Example 8: Copy the contents of directory 'sourcedir' to the directory @@ -869,19 +889,19 @@ Concept index Tag Table: Node: Top223 Node: Introduction1086 -Node: Invoking tarlz3280 -Ref: --data-size5339 -Ref: --bsolid11442 -Node: File format15072 -Ref: key_crc3219892 -Node: Amendments to pax format25309 -Ref: crc3225833 -Ref: flawed-compat26858 -Node: Multi-threaded tar29225 -Node: Minimum archive sizes31764 -Node: Examples33897 -Node: Problems35566 -Node: Concept index36092 +Node: Invoking tarlz3337 +Ref: --data-size5489 +Ref: --bsolid12172 +Node: File format15802 +Ref: key_crc3220622 +Node: Amendments to pax format26039 +Ref: crc3226580 +Ref: flawed-compat27605 +Node: Multi-threaded tar30128 +Node: Minimum archive sizes32667 +Node: Examples34800 +Node: Problems36517 +Node: Concept index37043 End Tag Table |