85 lines
2.1 KiB
Text
85 lines
2.1 KiB
Text
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#!/bin/sh
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#
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# culldeps
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#
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# Filter redundant dependencies.
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#
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# Each line of input and output contains two syspkg names,
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# where the first syspkg depends on the second syspkg.
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#
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# Emit all the dependencies on the standard input to the standard
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# output EXCEPT the dependencies which can be derived from other
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# dependencies by the transitive rule. For example, omit both A C
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# and A D from
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#
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# A B
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# B C
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# C D
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# A C
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# A D
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#
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# because A C can be derived from A B and B C by transitivity,
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# and A D can be derived from A B, B C, C D by transitivity.
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#
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prog="${0##*/}"
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rundir="$(dirname "$0")" # ${0%/*} isn't good enough when there's no "/"
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. "${rundir}/sets.subr"
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SCRATCH="$(${MKTEMP} -d "/var/tmp/${prog}.XXXXXX")"
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NEXTLEFTOVERS="${SCRATCH}/leftovers0"
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LASTJOIN="${SCRATCH}/join0"
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NEXTJOIN="${SCRATCH}/join1"
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TAB=" "
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${SORT} -k 1 > "${LASTJOIN}"
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LEFTOVERS="${LASTJOIN}"
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while [ "$(${WC} -l "${LASTJOIN}" | ${AWK} '{ print $1; }')" -ne 0 ]; do
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#
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# From dependencies X-requires-Y in ${LEFTOVERS} and Y-requires-Z in
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# ${LASTJOIN}, produce dependencies X-requires-Z and write them to
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# ${NEXTJOIN}.
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#
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${SORT} -k 2 < "${LEFTOVERS}" | \
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${JOIN} -1 2 -2 1 -o '1.1 2.2' - "${LASTJOIN}" | \
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${SORT} -u > "${NEXTJOIN}"
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if [ ${DEBUG:-0} -gt 0 ]; then
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echo >&2 "${prog}: ### begin filtered results ###"
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${JOIN} -t "${TAB}" "${NEXTJOIN}" "${LEFTOVERS}" | ${SORT} 1>&2
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echo >&2 "${prog}: ### end filtered results ###"
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fi
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#
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# Filter out of ${LEFTOVERS} all of the dependencies X-requires-Z, which
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# were produced in the previous step. Write the new leftovers to
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# ${NEXTLEFTOVERS}.
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#
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${JOIN} -v 2 -t "${TAB}" "${NEXTJOIN}" "${LEFTOVERS}" | \
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${SORT} -u > "${NEXTLEFTOVERS}"
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#
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# Swap output files before repeating.
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#
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LASTJOIN="${NEXTJOIN}"
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if [ "$(basename "${NEXTJOIN}")" = join0 ]; then
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NEXTJOIN="${SCRATCH}/join1"
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else
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NEXTJOIN="${SCRATCH}/join0"
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fi
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LEFTOVERS="${NEXTLEFTOVERS}"
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if [ "$(basename "${NEXTLEFTOVERS}")" = leftovers0 ]; then
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NEXTLEFTOVERS="${SCRATCH}/leftovers1"
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else
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NEXTLEFTOVERS="${SCRATCH}/leftovers0"
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fi
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done
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#
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# Output all of the dependencies that were not culled and clean up.
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#
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cat "${LEFTOVERS}"
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rm -r "${SCRATCH}"
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