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Enrico Weigelt schrieb: |
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> * Florian Philipp <lists@f_philipp.fastmail.net> wrote: |
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> |
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> Hi folks, |
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> |
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> |
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>> On Sun, 2008-01-27 at 11:40 +0100, Justin wrote: |
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>> |
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>>> Is there a way to use 7zip for decompression with emerge? |
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>>> |
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>> I fear, no easy one. Of course, since emerge is just a python script, |
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>> you could rewrite it but 7z-syntax isn't compatible with bzip2 or |
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>> gnu-tar so it will be some work. I also tried to use star as a drop-in |
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>> replacement for gnu-tar, once. Didn't work well although their syntax is |
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>> nearly identical, but just nearly... |
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>> |
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> |
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> Why not an universal wrapper script ? |
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> |
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> maybe something like: |
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> |
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> magic-uncompress [-t <format>] [-c] [-o <output>] <input> |
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> |
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> This script could try to find out the input format automatically |
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> (the optional -t parameter allows to explicitly specifiy the format) |
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> |
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> Once we have this script, ebuilds could be rewritten step by step |
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> and no one (else than magic-uncompress) has to care about the actual |
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> commands behind. |
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> |
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> Some could be done w/ tar and zip, etc. |
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> |
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> |
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> cu |
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> |
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|
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But than there is still the incompability problem with pbzip2 with bzip2 |
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compressed files. The best solution at this point would be to compress |
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all official tarballs with pbzip2, because now and especially in future |
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parallel processing is the solution and second there is no problem |
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decompressing parallel compressed tarballs in single mode. |
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|
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|
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For an temporary work around I figured out this hack: |
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|
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in /usr/lib/portage/bin/ebuild.sh there is a function defined for each |
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type of compression algorithm. I changed following lines |
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|
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--- ebuild.sh.orig 2008-01-27 19:16:22.000000000 +0100 |
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+++ ebuild.sh 2008-01-27 19:15:36.000000000 +0100 |
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@@ -479,7 +479,7 @@ |
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;; |
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bz2|bz) |
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if [ "${y}" == "tar" ]; then |
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- 7za x -so "${srcdir}${x}" | tar |
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xof - ${tar_opts} |
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+ bzip2 -dc "${srcdir}${x}" | tar |
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xof - ${tar_opts} |
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assert "$myfail" |
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else |
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bzip2 -dc "${srcdir}${x}" > |
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${x%.*} || die "$myfail" |
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|
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ebuild.sh.orig: |
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real 0m16.962s |
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user 0m16.289s |
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sys 0m2.780s |
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|
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|
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ebuild.sh: |
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real 0m12.805s |
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user 0m13.209s |
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sys 0m2.666s |
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|
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With this trick you can change every kind of decompression command. |
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|
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In this example you can save 25% of the time. |
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-- |
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