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|
fixupOutputHooks+=(_patchPpdFileCommands4fixupOutputHooks)
# Install a hook for the `fixupPhase`:
# If the variable `ppdFileCommands` contains a list of
# executable names, the hook calls `patchPpdFileCommands`
# on each output's `/share/cups/model` and `/share/ppds`
# directories in order to replace calls to those executables.
_patchPpdFileCommands4fixupOutputHooks () {
[[ -n $ppdFileCommands ]] || return 0
if [[ -d $prefix/share/cups/model ]]; then
patchPpdFileCommands "$prefix/share/cups/model" $ppdFileCommands
fi
if [[ -d $prefix/share/ppds ]]; then
patchPpdFileCommands "$prefix/share/ppds" $ppdFileCommands
fi
}
# patchPpdFileCommands PPD-ROOT PROGNAME...
#
# Look for ppd files in the directory PPD-ROOT.
# Descend into subdirectories, even if they are symlinks.
# However, ignore ppd files that don't belong to the same
# prefix ($NIX_STORE/$package_name) as PPD-ROOT-DIR does,
# to avoid stepping into other package's directories.
# ppd files may be gzipped; if the are,
# uncompress them, later recompress them.
# Skip symlinks to ppd files.
# PPD-ROOT may also be a single ppd file.
#
# Look for the PROGNAME executable in outputs and `buildInputs`,
# then look for PROGNAME invocations in the ppd files,
# without path or with common paths like `/usr/bin/$PROGNAME`.
# Replace those invocations with an absolute path to the
# corresponding executable from the outputs or `buildInputs`.
# Executables are searched where CUPS would search them,
# i.e., in `/bin` and `/lib/cups/filter`.
#
# As soon as an executable's path is replaced as
# described above, the package containing the binary
# is added to the list of propagated build inputs.
# This ensures the executable's package is still
# recognized as runtime dependency of the ppd file
# even if the ppd file is compressed lateron.
#
# PROGNAME may not contain spaces or tabs.
# The function will also likely fail or produce
# broken results if PROGNAME contains characters that
# require shell or regex escaping (e.g. a backslash).
patchPpdFileCommands () {
local bin binnew binold binoldgrep cupspath path ppdroot ppdrootprefix
# we will store some temporary data here
pushd "$(mktemp -d --tmpdir patch-ppd-file-commands.XXXX)"
# remember the ppd root path
[[ "$1" == $NIX_STORE/* ]] # ensure it's a store directory
ppdroot=$1
shift # now "$@" is the list of binaries
ppdrootprefix=${ppdroot%"/${ppdroot#"$NIX_STORE"/*/}"}
# create `cupspath` (where we should look for binaries),
# with these priorities
# * outputs of current build before buildInputs
# * `/lib/cups/filter' before `/bin`
# * add HOST_PATH at end, so we don't miss anything
for path in $outputs; do
addToSearchPath cupspath "${!path}/lib/cups/filter"
addToSearchPath cupspath "${!path}/bin"
done
for path in ${pkgsHostTarget+"${pkgsHostTarget[@]}"}; do
addToSearchPath cupspath "$path/lib/cups/filter"
addToSearchPath cupspath "$path/bin"
done
while read -r -d : path; do
addToSearchPath cupspath "$path"
done <<< "${HOST_PATH:+"${HOST_PATH}:"}"
# create list of compressed ppd files
# so we can recompress them later
find -L "$ppdroot" -type f -iname '*.ppd.gz' '!' -xtype l -print0 > gzipped
# decompress gzipped ppd files
echo "patchPpdFileCommands: decompressing $(grep -cz '^' < gzipped) gzipped ppd file(s) in $ppdroot"
xargs -0r -n 64 -P "$NIX_BUILD_CORES" gunzip < gzipped
# create list of all ppd files to be checked
find -L "$ppdroot" -type f -iname '*.ppd' '!' -xtype l -print0 > ppds
for bin in "$@"; do
# discover new path
binnew=$(PATH=$cupspath '@which@/bin/which' "$bin")
echo "patchPpdFileCommands: located binary $binnew"
# for each binary, we look for the name itself, but
# also for a couple of common paths that might be used
for binold in {/usr,}/{lib/cups/filter,sbin,bin}/"$bin" "$bin"; do
# escape regex characters in the old command string
binoldgrep=$(sed 's,[]$.*[\^],\\&,g' <<< "$binold")
# ...and surround old command with some regex
# that singles out shell command invocations
# to avoid replacing other strings that might contain the
# command name by accident (like "perl" in "perl-script")
binoldgrep='\(^\|[;&| '$'\t''"`(]\)'"$binoldgrep"'\($\|[);&| '$'\t''"`<>]\)'
# this string is used to *quickly* filter out
# unaffected files before the (slower) awk script runs;
# note that a similar regex is build in the awk script;
# if `binoldgrep` is changed, the awk script should also be checked
# create list of likely affected files
# (might yield exit status != 0 if there are no matches)
xargs -0r grep -lZ "$binoldgrep" < ppds > ppds-to-patch || true
echo "patchPpdFileCommands: $(grep -cz '^' < ppds-to-patch) ppd file(s) contain $binold"
# actually patch affected ppd files with awk;
# this takes some time but can be parallelized;
# speed up with LC_ALL=C, https://stackoverflow.com/a/33850386
LC_ALL=C xargs -0r -n 64 -P "$NIX_BUILD_CORES" \
awk -i inplace -v old="${binold//\\/\\\\}" -v new="${binnew//\\/\\\\}" -f "@awkscript@" \
< ppds-to-patch
done
# create list of affected files
xargs -0r grep -lZF "$binnew" < ppds > patched-ppds || true
echo "patchPpdFileCommands: $(grep -cz '^' < patched-ppds) ppd file(s) patched with $binnew"
# if the new command is contained in a file,
# remember the new path so we can add it to
# the list of propagated dependencies later
if [[ -s patched-ppds ]]; then
printf '%s\0' "${binnew%"/${binnew#"${NIX_STORE}"/*/}"}" >> dependencies
fi
done
# recompress ppd files that have been decompressed before
echo "patchPpdFileCommands: recompressing $(grep -cz '^' < gzipped) gzipped ppd file(s)"
# we can't just hand over the paths of the uncompressed files
# to gzip as it would add the lower-cased extension ".gz"
# even for files where the original was named ".GZ"
xargs -0r -n 1 -P "$NIX_BUILD_CORES" \
"$SHELL" -c 'gzip -9nS ".${0##*.}" "${0%.*}"' \
< gzipped
# enlist dependencies for propagation;
# this is needed in case ppd files are compressed later
# (Nix won't find dependency paths in compressed files)
if [[ -s dependencies ]]; then
# weed out duplicates from the dependency list first
sort -zu dependencies > sorted-dependencies
mkdir -p "$ppdrootprefix/nix-support"
while IFS= read -r -d '' path; do
printWords "$path" >> "$ppdrootprefix/nix-support/propagated-build-inputs"
# stdenv writes it's own `propagated-build-inputs`,
# based on the variable `propagatedBuildInputs`,
# but only to one output (`outputDev`).
# So we also add our dependencies to that variable.
# If our file survives as written above, great!
# If stdenv overwrits it,
# our dependencies will still be added to the file.
# The end result might contain too many
# propagated dependencies for multi-output packages,
# but never a broken package.
propagatedBuildInputs+=("$path")
done < sorted-dependencies
fi
popd
}
|
