817f533126
For kernel builds, /usr/lib/rpm/kmod.prov is fork+execed by rpmbuild in "Processing files:" step about 8000 times, single-threaded, with cumulative run time of ~2 minutes. Speed up this script, by avoiding additional fork+execing. Tested to work, observed speedup: almost exactly 2 times faster. While verifying correctness, noticed that old script was buggy - it was generating a bogus "Provides:" item - kmod(modules.builtin.modinfo), because the logic in script was filtering for */*.ko files and for */modules.builtin* files, and wasn't prepared for the existence of */modules.builtin.modinfo file. Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
29 lines
682 B
Bash
29 lines
682 B
Bash
#!/bin/sh +x
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# Kernel build can have many thousands of modules.
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# kmod.prov is run for every one of them.
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# Try to make this script run as fast as we can.
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# For example, use shell string ops instead of external programs
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# where possible.
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IFS=$'\n'
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read -r fname || exit
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# Only process files from .../lib/modules/... subtree
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[ "${fname#*/lib/modules/*}" != "$fname" ] || exit 0
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kmod=${fname##*/} # like basename, but faster
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if [ "$kmod" = "modules.builtin" ]; then
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for j in $(cat -- "$fname"); do
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echo "kmod(${j##*/})"
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done
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exit 0
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fi
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kmod=${kmod%.gz}
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kmod=${kmod%.xz}
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if [ "${kmod%.ko}" != "$kmod" ]; then
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echo "kmod($kmod)"
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fi
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