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