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find-package (FindByName): added more comments, for casual readers

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This commit is contained in:
Alexey Tourbin 2007-08-08 00:18:21 +04:00
parent 706ff5d5ec
commit 7c7eccde32
1 changed files with 24 additions and 5 deletions
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29
scripts/find-package.in
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@ -133,7 +133,7 @@ FindByName()
fi
# Check for pkg contents binary index.
rep= package=
local save_rep= save_package=
if [ -n "${RPM_PKG_CONTENTS_INDEX_BIN-}" ] && [ -s "$RPM_PKG_CONTENTS_INDEX_BIN" ] && [ -r "$RPM_PKG_CONTENTS_INDEX_BIN" ]; then
local out="$(awk -v r="$r" -v RPM_FINDPACKAGE_PATH="$RPM_FINDPACKAGE_PATH" '
BEGIN {
@ -177,6 +177,13 @@ FindByName()
printf %s\\n "$package"
return
elif [ "$n" -gt 1 ]; then
# Content index search produced a confict: we have 2 or more paths
# from different packages. Consider this case:
# /usr/bin/r pkgA
# /usr/bin/r pkgB
# /usr/sbin/r pkgC
# Remeber that best paths go first, and each package has only the best path.
# Now if the first two paths are the same, we produce raw dependency on /usr/bin/r.
local Verbose=Info
Info "$f: $r indexed by:$(printf %s "$out" |sed -e 's/\t/ -> /; s/$/,/; $s/,$//' |xargs echo '')"
rep="$(IFS=$'\t\n'; set -- $out; printf %s "$1")"
@ -187,19 +194,31 @@ FindByName()
printf %s\\n "$rep"
return
fi
# However, consdier yet worse real-life case:
# /usr/bin/arpsend arpsend
# /usr/sbin/arpsend vzctl
# In this case, we perfer to put aside the conflict for a while, and query
# the host system first. There's a good chance that the right package, either
# arpsend or vzctl, IS installed, and other unrelated packages are NOT installed.
# However, if /usr/bin/which cannot find any candidate, we have to produce the
# dependency on /usr/bin/arpsend -> arpsend.
save_rep="$rep" save_package="$package"
fi
fi
# Lookup in the host system.
local irep="$rep"
if rep="$(PATH="$RPM_FINDPACKAGE_PATH" /usr/bin/which --all -- "$r" 2>/dev/null)"; then
local n="$(IFS=$'\n'; set -- $rep; echo $#)"
if [ "$n" -gt 1 ]; then
# If '/usr/bin/which --all' yields a few paths,
# e.g. '/usr/bin/which --all awk' -> {/bin/awk,/usr/bin/awk},
# we check if all paths really point to the same file.
n="$(IFS=$'\n'; for f in $rep; do readlink -vm "$f"; done |sort -u |wc -l)"
if [ "$n" -gt 1 ]; then
local Verbose=Info
Info "$f: which $r:$(echo '' $rep)"
fi
# But we select the first path, which is the best, anyway.
rep="$(IFS=$'\n'; set -- $rep; printf %s "$1")"
fi
if [ -n "$rep" ]; then
@ -209,9 +228,9 @@ FindByName()
fi
fi
# Reconsult pkg contents binary index.
if [ -n "$irep" ] && [ -n "$package" ]; then
rep="$irep"
# Reconsult package binary index.
if [ -n "$save_rep" ] && [ -n "$save_package" ]; then
rep="$save_rep" package="$save_package"
$Verbose "$f: $r -> $rep -> $package (via contents_index_bin)"
printf %s\\n "$package"
return