forked from josch/mmdebstrap
tarfilter: Compile prefix pattern only once
According to Debian bug #978742, mmtarfilter has a slow performance with many path exclusions. The execution can be speed up if the regular expression is only compiled once instead of every time in the hot loop. Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>
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1 changed files with 2 additions and 1 deletions
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@ -61,6 +61,7 @@ dpkg(1) for information on how these two options work in detail.
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exit()
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# same logic as in dpkg/src/filters.c/filter_should_skip()
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prefix_prog = re.compile(r"^([^*?[\\]*).*")
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def filter_should_skip(member):
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skip = False
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if not args.filter:
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@ -75,7 +76,7 @@ dpkg(1) for information on how these two options work in detail.
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for (t, r) in args.filter:
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if t != "path_include":
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continue
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prefix = re.sub(r"^([^*?[\\]*).*", r"\1", r.pattern)
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prefix = prefix_prog.sub(r"\1", r.pattern)
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prefix = prefix.rstrip("/")
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if member.name[1:].startswith(prefix):
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if member.name == "./usr/share/doc/doc-debian":
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