89 lines
3.1 KiB
Bash
89 lines
3.1 KiB
Bash
# This setup hook modifies a Perl script so that any "-I" flags in its shebang
|
|
# line are rewritten into a "use lib ..." statement on the next line. This gets
|
|
# around a limitation in Darwin, which will not properly handle a script whose
|
|
# shebang line exceeds 511 characters.
|
|
#
|
|
# Each occurrence of "-I /path/to/lib1" or "-I/path/to/lib2" is removed from
|
|
# the shebang line, along with the single space that preceded it. These library
|
|
# paths are placed into a new line of the form
|
|
#
|
|
# use lib "/path/to/lib1", "/path/to/lib2";
|
|
#
|
|
# immediately following the shebang line. If a library appeared in the original
|
|
# list more than once, only its first occurrence will appear in the output
|
|
# list. In other words, the libraries are deduplicated, but the ordering of the
|
|
# first appearance of each one is preserved.
|
|
#
|
|
# Any flags other than "-I" in the shebang line are left as-is, and the
|
|
# interpreter is also left alone (although the script will abort if the
|
|
# interpreter does not seem to be either "perl" or else "env" with "perl" as
|
|
# its argument). Each line after the shebang line is left unchanged. Each file
|
|
# is modified in place.
|
|
#
|
|
# Usage:
|
|
# shortenPerlShebang SCRIPT...
|
|
|
|
shortenPerlShebang() {
|
|
while [ $# -gt 0 ]; do
|
|
_shortenPerlShebang "$1"
|
|
shift
|
|
done
|
|
}
|
|
|
|
_shortenPerlShebang() {
|
|
local program="$1"
|
|
|
|
echo "shortenPerlShebang: rewriting shebang line in $program"
|
|
|
|
if ! isScript "$program"; then
|
|
die "shortenPerlShebang: refusing to modify $program because it is not a script"
|
|
fi
|
|
|
|
local temp="$(mktemp)"
|
|
|
|
gawk '
|
|
(NR == 1) {
|
|
if (!($0 ~ /\/(perl|env +perl)\>/)) {
|
|
print "shortenPerlShebang: script does not seem to be a Perl script" > "/dev/stderr"
|
|
exit 1
|
|
}
|
|
idx = 0
|
|
while (match($0, / -I ?([^ ]+)/, pieces)) {
|
|
matches[idx] = pieces[1]
|
|
idx++
|
|
$0 = gensub(/ -I ?[^ ]+/, "", 1, $0)
|
|
}
|
|
print $0
|
|
if (idx > 0) {
|
|
prefix = "use lib "
|
|
for (idx in matches) {
|
|
path = matches[idx]
|
|
if (!(path in seen)) {
|
|
printf "%s\"%s\"", prefix, path
|
|
seen[path] = 1
|
|
prefix = ", "
|
|
}
|
|
}
|
|
print ";"
|
|
}
|
|
}
|
|
(NR > 1 ) {
|
|
print
|
|
}
|
|
' "$program" > "$temp" || die
|
|
# Preserve the mode of the original file
|
|
cp --preserve=mode --attributes-only "$program" "$temp"
|
|
mv "$temp" "$program"
|
|
|
|
# Measure the new shebang line length and make sure it's okay. We subtract
|
|
# one to account for the trailing newline that "head" included in its
|
|
# output.
|
|
local new_length=$(( $(head -n 1 "$program" | wc -c) - 1 ))
|
|
|
|
# Darwin is okay when the shebang line contains 511 characters, but not
|
|
# when it contains 512 characters.
|
|
if [ $new_length -ge 512 ]; then
|
|
die "shortenPerlShebang: shebang line is $new_length characters--still too long for Darwin!"
|
|
fi
|
|
}
|