forked from mirrors/nixpkgs
222 lines
8.8 KiB
Bash
222 lines
8.8 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 the name of the executed process to NAME
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# (if unset or empty, defaults to EXECUTABLE)
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# --inherit-argv0 : the executable inherits argv0 from the wrapper.
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# (use instead of --argv0 '$0')
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# --set VAR VAL : add VAR with value VAL to the executable's environment
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# --set-default VAR VAL : like --set, but only adds VAR if not already set in
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# the environment
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# --unset VAR : remove VAR from the environment
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# --chdir DIR : change working directory (use instead of --run "cd DIR")
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# --run COMMAND : run command before the executable
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# --add-flags ARGS : prepend ARGS to the invocation of the executable
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# (that is, *before* any arguments passed on the command line)
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# --append-flags ARGS : append ARGS to the invocation of the executable
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# (that is, *after* any arguments passed on the command line)
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# --prefix ENV SEP VAL : suffix/prefix ENV with VAL, separated by SEP
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# --suffix
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# --prefix-each ENV SEP VALS : like --prefix, but VALS is a list
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# --suffix-each ENV SEP VALS : like --suffix, but VALS is a list
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# --prefix-contents ENV SEP FILES : like --suffix-each, but contents of FILES
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# are read first and used as VALS
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# --suffix-contents
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makeWrapper() { makeShellWrapper "$@"; }
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makeShellWrapper() {
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local original="$1"
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local wrapper="$2"
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local params varName value command separator n fileNames
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local argv0 flagsBefore flagsAfter flags
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assertExecutable "$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="$4" # one value, or multiple values separated by `separator`, to add to list
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# Disable file globbing, since bash will otherwise try to find
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# filenames matching the the value to be prefixed/suffixed if
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# it contains characters considered wildcards, such as `?` and
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# `*`. We want the value as is, except we also want to split
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# it on on the separator; hence we can't quote it.
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local reenableGlob=0
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if [[ ! -o noglob ]]; then
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reenableGlob=1
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fi
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set -o noglob
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if [[ -n "$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=$old_ifs
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fi
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if (( reenableGlob )); then
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set +o noglob
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fi
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}
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mkdir -p "$(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 [[ "$p" == "--chdir" ]]; then
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dir="${params[$((n + 1))]}"
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n=$((n + 1))
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echo "cd ${dir@Q}" >> "$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" == "--append-flags" ]]; then
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flags="${params[$((n + 1))]}"
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n=$((n + 1))
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flagsAfter="$flagsAfter $flags"
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elif [[ "$p" == "--argv0" ]]; then
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argv0="${params[$((n + 1))]}"
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n=$((n + 1))
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elif [[ "$p" == "--inherit-argv0" ]]; then
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# Whichever comes last of --argv0 and --inherit-argv0 wins
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argv0='$0'
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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" '"$@"' "$flagsAfter" >> "$wrapper"
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chmod +x "$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 "$fn"
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fi
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done
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}
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# Syntax: wrapProgram <PROGRAM> <MAKE-WRAPPER FLAGS...>
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wrapProgram() { wrapProgramShell "$@"; }
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wrapProgramShell() {
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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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makeWrapper "$hidden" "$prog" --inherit-argv0 "${@:2}"
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}
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