104 lines
2.9 KiB
Bash
Executable File
104 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
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# sbang project developers. See the top-level COPYRIGHT file for details.
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#
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# SPDX-License-Identifier: (Apache-2.0 OR MIT)
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#
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# `sbang`: Run scripts with long shebang lines.
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#
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# Many operating systems limit the length and number of possible
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# arguments in shebang lines, making it hard to use interpreters that are
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# deep in the directory hierarchy or require special arguments.
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#
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# To use, put the long shebang on the second line of your script, and
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# make sbang the interpreter, like this:
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#
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# #!/bin/sh /path/to/sbang
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# #!/long/path/to/real/interpreter with arguments
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#
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# `sbang` will run the real interpreter with the script as its argument.
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#
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# See https://github.com/spack/sbang for more details.
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#
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# Generic error handling
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die() {
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echo "$@" 1>&2;
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exit 1
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}
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# set SBANG_DEBUG to make the script print what would normally be executed.
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exec="exec"
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if [ -n "${SBANG_DEBUG}" ]; then
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exec="echo "
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fi
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# First argument is the script we want to actually run.
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script="$1"
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# ensure that the script actually exists
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if [ -z "$script" ]; then
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die "error: sbang requires exactly one argument"
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elif [ ! -f "$script" ]; then
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die "$script: no such file or directory"
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fi
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# Search the first two lines of script for interpreters.
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lines=0
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while read -r line && [ $lines -ne 2 ]; do
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if [ "${line#\#!}" != "$line" ]; then
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shebang_line="${line#\#!}"
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elif [ "${line#//!}" != "$line" ]; then # // comments
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shebang_line="${line#//!}"
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elif [ "${line#--!}" != "$line" ]; then # -- lua comments
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shebang_line="${line#--!}"
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elif [ "${line#<?php\ }" != "$line" ]; then # php comments
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shebang_line="${line#<?php\ \#!}"
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shebang_line="${shebang_line%\ ?>}"
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fi
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lines=$((lines+1))
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done < "$script"
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# error if we did not find any interpreter
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if [ -z "$shebang_line" ]; then
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die "error: sbang found no interpreter in $script"
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fi
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# parse out the interpreter and first argument
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IFS=' ' read -r interpreter arg1 rest <<EOF
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$shebang_line
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EOF
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# Determine if the interpreter is a particular program, accounting for the
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# '#!/usr/bin/env PROGRAM' convention. So:
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#
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# interpreter_is perl
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#
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# will be true for '#!/usr/bin/perl' and '#!/usr/bin/env perl'
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interpreter_is() {
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if [ "${interpreter##*/}" = "$1" ]; then
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return 0
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elif [ "$interpreter" = "/usr/bin/env" ] && [ "$arg1" = "$1" ]; then
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return 0
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else
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return 1
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fi
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}
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if interpreter_is "sbang"; then
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die "error: refusing to re-execute sbang to avoid infinite loop."
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fi
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# Finally invoke the real shebang line
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# ruby and perl need -x to ignore the first line of input (the sbang line)
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#
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if interpreter_is perl || interpreter_is ruby; then
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# shellcheck disable=SC2086
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$exec $shebang_line -x "$@"
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else
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# shellcheck disable=SC2086
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$exec $shebang_line "$@"
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fi
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