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https://github.com/NixOS/nixpkgs.git
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c67f885fe4
When prefixing or suffixing list variables, check that the value or values aren't already part of the list. If this is the case when suffixing, the list won't be touched at all. When prefixing, however, the last matching instance of the value will be moved to the beginning of the list. Any remaining duplicates of the value will be left as-is. Co-authored-by: Vincenzo Mantova <xworld21@users.sf.net>
190 lines
7.3 KiB
Bash
190 lines
7.3 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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# --prefix-each ENV SEP VALS : like --prefix, but VALS is a list
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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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# Write wrapper code which adds `value` to the beginning or end of
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# the list variable named by `varName`, depending on the `mode`
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# specified.
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#
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# A value which is already part of the list will not be added
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# again. If this is the case and the `suffix` mode is used, the
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# list won't be touched at all. The `prefix` mode will however
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# move the last matching instance of the value to the beginning
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# of the list. Any remaining duplicates of the value will be left
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# as-is.
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addValue() {
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local mode="$1" # `prefix` or `suffix` to add to the beginning or end respectively
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local varName="$2" # name of list variable to add to
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local separator="$3" # character used to separate elements of list
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local value="$4" # one value, or multiple values separated by `separator`, to add to list
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if test -n "$value"; then
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local old_ifs=$IFS
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IFS=$separator
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if [[ "$mode" == '--prefix'* ]]; then
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# Keep the order of the components as written when
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# prefixing; normally, they would be added in the
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# reverse order.
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local tmp=
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for v in $value; do
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tmp=$v${tmp:+$separator}$tmp
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done
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value="$tmp"
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fi
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for v in $value; do
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{
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echo "$varName=\${$varName:+${separator@Q}\$$varName${separator@Q}}" # add separators on both ends unless empty
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if [[ "$mode" == '--prefix'* ]]; then # -- in prefix mode --
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echo "$varName=\${$varName/${separator@Q}${v@Q}${separator@Q}/${separator@Q}}" # remove the first instance of the value (if any)
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echo "$varName=${v@Q}\$$varName" # prepend the value
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elif [[ "$mode" == '--suffix'* ]]; then # -- in suffix mode --
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echo "if [[ \$$varName != *${separator@Q}${v@Q}${separator@Q}* ]]; then" # if the value isn't already in the list
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echo " $varName=\$$varName${v@Q}" # append the value
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echo "fi"
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else
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echo "unknown mode $mode!" 1>&2
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exit 1
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fi
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echo "$varName=\${$varName#${separator@Q}}" # remove leading separator
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echo "$varName=\${$varName%${separator@Q}}" # remove trailing separator
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echo "export $varName"
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} >> "$wrapper"
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done
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IFS=$old_ifs
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fi
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}
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mkdir -p "$(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=$((n + 3))
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addValue "$p" "$varName" "$separator" "$value"
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elif [[ ("$p" == "--suffix-each") || ("$p" == "--prefix-each") ]]; then
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varName="${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 $values; do
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addValue "$p" "$varName" "$separator" "$value"
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done
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elif [[ ("$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 "$fileName")"
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addValue "$p" "$varName" "$separator" "$contents"
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done
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elif [[ "$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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