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