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# Assert that FILE exists and is executable
#
# assertExecutable FILE
assertExecutable() {
local file="$1"
[[ -f "$file" && -x "$file" ]] || \
die "Cannot wrap '$file' because it is not an executable file"
}
# construct an executable file that wraps the actual executable
# makeWrapper EXECUTABLE OUT_PATH ARGS
# ARGS:
# --argv0 NAME : set name of executed process to NAME
# (otherwise it’s called …-wrapped)
# --set VAR VAL : add VAR with value VAL to the executable’s
# environment
# --set-default VAR VAL : like --set, but only adds VAR if not already set in
# the environment
# --unset VAR : remove VAR from the environment
# --run COMMAND : run command before the executable
# --add-flags FLAGS : add FLAGS to invocation of executable
# --prefix ENV SEP VAL : suffix/prefix ENV with VAL, separated by SEP
# --suffix
# --suffix-each ENV SEP VALS : like --suffix, but VALS is a list
# --prefix-contents ENV SEP FILES : like --suffix-each, but contents of FILES
# are read first and used as VALS
# --suffix-contents
makeWrapper() {
local original="$1"
local wrapper="$2"
local params varName value command separator n fileNames
local argv0 flagsBefore flags
assertExecutable "$original"
mkdir -p "$(dirname "$wrapper")"
echo "#! @shell@ -e" > "$wrapper"
params=("$@")
for ((n = 2; n < ${#params[*]}; n += 1)); do
p="${params[$n]}"
if [[ "$p" == "--set" ]]; then
varName="${params[$((n + 1))]}"
value="${params[$((n + 2))]}"
n=$((n + 2))
echo "export $varName=${value@Q}" >> "$wrapper"
elif [[ "$p" == "--set-default" ]]; then
varName="${params[$((n + 1))]}"
value="${params[$((n + 2))]}"
n=$((n + 2))
echo "export $varName=\${$varName-${value@Q}}" >> "$wrapper"
elif [[ "$p" == "--unset" ]]; then
varName="${params[$((n + 1))]}"
n=$((n + 1))
echo "unset $varName" >> "$wrapper"
elif [[ "$p" == "--run" ]]; then
command="${params[$((n + 1))]}"
n=$((n + 1))
echo "$command" >> "$wrapper"
elif [[ ("$p" == "--suffix") || ("$p" == "--prefix") ]]; then
varName="${params[$((n + 1))]}"
separator="${params[$((n + 2))]}"
value="${params[$((n + 3))]}"
n=$((n + 3))
if test -n "$value"; then
if test "$p" = "--suffix"; then
echo "export $varName=\$$varName\${$varName:+${separator@Q}}${value@Q}" >> "$wrapper"
else
echo "export $varName=${value@Q}\${$varName:+${separator@Q}}\$$varName" >> "$wrapper"
fi
fi
elif [[ "$p" == "--suffix-each" ]]; then
varName="${params[$((n + 1))]}"
separator="${params[$((n + 2))]}"
values="${params[$((n + 3))]}"
n=$((n + 3))
for value in $values; do
echo "export $varName=\$$varName\${$varName:+$separator}${value@Q}" >> "$wrapper"
done
elif [[ ("$p" == "--suffix-contents") || ("$p" == "--prefix-contents") ]]; then
varName="${params[$((n + 1))]}"
separator="${params[$((n + 2))]}"
fileNames="${params[$((n + 3))]}"
n=$((n + 3))
for fileName in $fileNames; do
contents="$(cat "$fileName")"
if test "$p" = "--suffix-contents"; then
echo "export $varName=\$$varName\${$varName:+$separator}${contents@Q}" >> "$wrapper"
else
echo "export $varName=${contents@Q}\${$varName:+$separator}\$$varName" >> "$wrapper"
fi
done
elif [[ "$p" == "--add-flags" ]]; then
flags="${params[$((n + 1))]}"
n=$((n + 1))
flagsBefore="$flagsBefore $flags"
elif [[ "$p" == "--argv0" ]]; then
argv0="${params[$((n + 1))]}"
n=$((n + 1))
else
die "makeWrapper doesn't understand the arg $p"
fi
done
echo exec ${argv0:+-a \"$argv0\"} \""$original"\" \
"$flagsBefore" '"$@"' >> "$wrapper"
chmod +x "$wrapper"
}
addSuffix() {
suffix="$1"
shift
for name in "$@"; do
echo "$name$suffix"
done
}
filterExisting() {
for fn in "$@"; do
if test -e "$fn"; then
echo "$fn"
fi
done
}
# Syntax: wrapProgram <PROGRAM> <MAKE-WRAPPER FLAGS...>
wrapProgram() {
local prog="$1"
local hidden
assertExecutable "$prog"
hidden="$(dirname "$prog")/.$(basename "$prog")"-wrapped
while [ -e "$hidden" ]; do
hidden="${hidden}_"
done
mv "$prog" "$hidden"
# Silence warning about unexpanded $0:
# shellcheck disable=SC2016
makeWrapper "$hidden" "$prog" --argv0 '$0' "${@:2}"
}
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