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https://github.com/NixOS/nixpkgs.git
synced 2024-12-16 01:46:30 +00:00
a45b3ad89f
There is a bug in this feature: It allows extra arguments to leak in from the environment. For example: $ export extraFlagsArray=date $ man ls Note that you get the man page for date rather than for ls. This happens because 'man' happens to use a wrapper (to add groff to its PATH). An attempt to fix this was made in5ae18574fcin PR #19328 for issue #2537, but 1. That change didn't actually fix the problem because it addressed makeWrapper's environment during the build process, not the constructed wrapper script's environment after installation, and 2. That change was apparently accidentally lost when merged with7ff6eec5fd. Rather than trying to fix the bug again, we remove the extraFlagsArray feature, since it has never been used in the public repo in the ten years it has been available. wrapAclocal continues to use its own, separate flavor of extraFlagsArray in a more limited context. The analogous bug there was fixed in4d7d10da6bin 2011.
147 lines
4.9 KiB
Bash
147 lines
4.9 KiB
Bash
# Assert that FILE exists and is executable
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#
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# assertExecutable FILE
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assertExecutable() {
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local file="$1"
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[[ -f "$file" && -x "$file" ]] || \
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die "Cannot wrap '$file' because it is not an executable file"
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}
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# construct an executable file that wraps the actual executable
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# makeWrapper EXECUTABLE OUT_PATH ARGS
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# ARGS:
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# --argv0 NAME : set name of executed process to NAME
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# (otherwise it’s called …-wrapped)
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# --set VAR VAL : add VAR with value VAL to the executable’s
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# environment
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# --set-default VAR VAL : like --set, but only adds VAR if not already set in
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# the environment
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# --unset VAR : remove VAR from the environment
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# --run COMMAND : run command before the executable
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# --add-flags FLAGS : add FLAGS to invocation of executable
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# --prefix ENV SEP VAL : suffix/prefix ENV with VAL, separated by SEP
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# --suffix
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# --suffix-each ENV SEP VALS : like --suffix, but VALS is a list
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# --prefix-contents ENV SEP FILES : like --suffix-each, but contents of FILES
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# are read first and used as VALS
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# --suffix-contents
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makeWrapper() {
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local original="$1"
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local wrapper="$2"
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local params varName value command separator n fileNames
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local argv0 flagsBefore flags
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assertExecutable "$original"
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mkdir -p "$(dirname "$wrapper")"
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echo "#! @shell@ -e" > "$wrapper"
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params=("$@")
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for ((n = 2; n < ${#params[*]}; n += 1)); do
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p="${params[$n]}"
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if [[ "$p" == "--set" ]]; then
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varName="${params[$((n + 1))]}"
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value="${params[$((n + 2))]}"
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n=$((n + 2))
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echo "export $varName=${value@Q}" >> "$wrapper"
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elif [[ "$p" == "--set-default" ]]; then
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varName="${params[$((n + 1))]}"
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value="${params[$((n + 2))]}"
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n=$((n + 2))
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echo "export $varName=\${$varName-${value@Q}}" >> "$wrapper"
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elif [[ "$p" == "--unset" ]]; then
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varName="${params[$((n + 1))]}"
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n=$((n + 1))
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echo "unset $varName" >> "$wrapper"
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elif [[ "$p" == "--run" ]]; then
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command="${params[$((n + 1))]}"
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n=$((n + 1))
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echo "$command" >> "$wrapper"
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elif [[ ("$p" == "--suffix") || ("$p" == "--prefix") ]]; then
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varName="${params[$((n + 1))]}"
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separator="${params[$((n + 2))]}"
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value="${params[$((n + 3))]}"
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n=$((n + 3))
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if test -n "$value"; then
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if test "$p" = "--suffix"; then
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echo "export $varName=\$$varName\${$varName:+${separator@Q}}${value@Q}" >> "$wrapper"
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else
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echo "export $varName=${value@Q}\${$varName:+${separator@Q}}\$$varName" >> "$wrapper"
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fi
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fi
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elif [[ "$p" == "--suffix-each" ]]; then
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varName="${params[$((n + 1))]}"
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separator="${params[$((n + 2))]}"
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values="${params[$((n + 3))]}"
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n=$((n + 3))
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for value in $values; do
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echo "export $varName=\$$varName\${$varName:+$separator}${value@Q}" >> "$wrapper"
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done
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elif [[ ("$p" == "--suffix-contents") || ("$p" == "--prefix-contents") ]]; then
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varName="${params[$((n + 1))]}"
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separator="${params[$((n + 2))]}"
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fileNames="${params[$((n + 3))]}"
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n=$((n + 3))
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for fileName in $fileNames; do
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contents="$(cat "$fileName")"
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if test "$p" = "--suffix-contents"; then
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echo "export $varName=\$$varName\${$varName:+$separator}${contents@Q}" >> "$wrapper"
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else
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echo "export $varName=${contents@Q}\${$varName:+$separator}\$$varName" >> "$wrapper"
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fi
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done
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elif [[ "$p" == "--add-flags" ]]; then
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flags="${params[$((n + 1))]}"
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n=$((n + 1))
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flagsBefore="$flagsBefore $flags"
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elif [[ "$p" == "--argv0" ]]; then
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argv0="${params[$((n + 1))]}"
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n=$((n + 1))
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else
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die "makeWrapper doesn't understand the arg $p"
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fi
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done
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echo exec ${argv0:+-a \"$argv0\"} \""$original"\" \
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"$flagsBefore" '"$@"' >> "$wrapper"
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chmod +x "$wrapper"
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}
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addSuffix() {
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suffix="$1"
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shift
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for name in "$@"; do
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echo "$name$suffix"
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done
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}
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filterExisting() {
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for fn in "$@"; do
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if test -e "$fn"; then
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echo "$fn"
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fi
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done
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}
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# Syntax: wrapProgram <PROGRAM> <MAKE-WRAPPER FLAGS...>
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wrapProgram() {
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local prog="$1"
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local hidden
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assertExecutable "$prog"
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hidden="$(dirname "$prog")/.$(basename "$prog")"-wrapped
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while [ -e "$hidden" ]; do
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hidden="${hidden}_"
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done
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mv "$prog" "$hidden"
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# Silence warning about unexpanded $0:
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# shellcheck disable=SC2016
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makeWrapper "$hidden" "$prog" --argv0 '$0' "${@:2}"
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}
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