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  1. 02 Jul, 2020 1 commit
    • Dmitry's avatar
      modules: allow user to configure decompression program · 62aca914
      Dmitry authored 
      Commit 3753b5fd ("modules: let tar automatically determine decompression program")
introduced a regression for not gzip compatible compressors, which is sad.

Let's allow user to explicitly configure decompression programm if required,
and pick decompression programm automatically otherwise.

New option:
  --decompressprog (default is empty)
New variable:
   DECOMPRESSPROG: default is empty, let tar automatically determine decompression program

For example, pigz decompression is about 30% faster than gzip, but personaly I prefer zstd
(https://github.com/facebook/zstd) which support smp and has very fast decompression speed.

Comparison:
$ time pbuilder --execute --configfile pbuilderrc-gz  /bin/true  > /dev/null 2>&1
real    0m2.339s

$ time pbuilder --execute --configfile pbuilderrc-gz --decompressprog pigz /bin/true  > /dev/null 2>&1
real    0m1.576s

## pbuilderrc-zst
# COMPRESSPROG=zstdmt
# DECOMPRESSPROG=zstdmt
# BASETGZ=base.tar.zst
$ time pbui...
      62aca914
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