| May 4, 2001 |
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| User tools for zisofs: |
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| The user tools for zisofs come in two parts: a utility "mkzftree" and |
| a patch for cdrtools-1.10 (which includes mkisofs). |
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| First create a directory tree containing compressed files: |
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| mkzftree input_dir compressed_dir |
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| mkzftree will not overwrite an existing directory; you may want to "rm |
| -rf" the directory tree if you are doing this from a script: |
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| Second, invoke the patched mkisofs with the -z option: |
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| mkisofs -z -R [other options] -o compressed.iso compressed_dir |
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| IMPORTANT: you *must* use RockRidge (-R) since this is an extensions |
| to the RockRidge specification. Without the -R, -z will have no effect. |
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| Note that if there are files you do not want compressed (for example, |
| files involved in booting, or README files you want to be readable |
| under all circumstances) you can simply put them in a separate tree |
| and not run mkzftree on that tree. |
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| mkzftree will not compress files that end up larger when compressed; |
| if you want it to compress the files anyway, you can give the -f |
| option to mkzftree. |
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| mkzftree also accepts a -u option (uncompress), which can be used to |
| convert a compressed tree back to normal form. This can be used to |
| read a zisofs CD-ROM on a machine without zisofs kernel support. |
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| This version of mkzftree supports a -p option (parallelize.) |
| Specifying -p and a parallelism (e.g. -p4) allows up to four files to |
| compress in parallel. Depending on your setup and your data set size, |
| this might speed things up if you are not completely I/O bound. Use |
| -p0 to completely disable parallel execution; this is the default. |
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