5ae18574fc
extraFlagsArray should not be exposed outside of `makeWrapper`, it should only be possible to set it inside a script supplied via the `--run` argument.
135 lines
4.3 KiB
Bash
135 lines
4.3 KiB
Bash
# construct an executable file that wraps the actual executable
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# makeWrapper EXECUTABLE 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 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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# The command can push extra flags to a magic list variable
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# extraFlagsArray, which are then added to the invocation
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# of 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=$2
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local params varName value command separator n fileNames
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local argv0 flagsBefore flags extraFlagsArray
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mkdir -p "$(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[$n]}
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if test "$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\"" >> $wrapper
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fi
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if test "$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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fi
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if test "$p" = "--run"; then
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command=${params[$((n + 1))]}
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n=$((n + 1))
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echo "$command" >> $wrapper
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fi
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if test "$p" = "--suffix" -o "$p" = "--prefix"; then
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varName=${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}$value" >> $wrapper
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else
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echo "export $varName=$value\${$varName:+$separator}\$$varName" >> $wrapper
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fi
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fi
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fi
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if test "$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" >> $wrapper
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done
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fi
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if test "$p" = "--suffix-contents" -o "$p" = "--prefix-contents"; then
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varName=${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 $fileNames; do
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if test "$p" = "--suffix-contents"; then
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echo "export $varName=\$$varName\${$varName:+$separator}$(cat $fileName)" >> $wrapper
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else
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echo "export $varName=$(cat $fileName)\${$varName:+$separator}\$$varName" >> $wrapper
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fi
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done
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fi
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if test "$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 $flags"
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fi
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if test "$p" = "--argv0"; then
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argv0=${params[$((n + 1))]}
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n=$((n + 1))
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fi
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done
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# Note: extraFlagsArray is an array containing additional flags
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# that may be set by --run actions.
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echo exec ${argv0:+-a $argv0} "$original" \
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$flagsBefore '"${extraFlagsArray[@]}"' '"$@"' >> $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="$1"
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local hidden="$(dirname "$prog")/.$(basename "$prog")"-wrapped
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mv $prog $hidden
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makeWrapper $hidden $prog --argv0 '"$0"' "$@"
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}
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