This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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37 lines
894 B
37 lines
894 B
'use strict'; |
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var fs = require('fs'); |
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var LRU = require('lru-cache'); |
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var shebangCommand = require('shebang-command'); |
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var shebangCache = new LRU({ max: 50, maxAge: 30 * 1000 }); // Cache just for 30sec |
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function readShebang(command) { |
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var buffer; |
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var fd; |
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var shebang; |
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// Check if it is in the cache first |
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if (shebangCache.has(command)) { |
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return shebangCache.get(command); |
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} |
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// Read the first 150 bytes from the file |
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buffer = new Buffer(150); |
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try { |
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fd = fs.openSync(command, 'r'); |
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fs.readSync(fd, buffer, 0, 150, 0); |
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fs.closeSync(fd); |
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} catch (e) { /* empty */ } |
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// Attempt to extract shebang (null is returned if not a shebang) |
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shebang = shebangCommand(buffer.toString()); |
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// Store the shebang in the cache |
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shebangCache.set(command, shebang); |
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return shebang; |
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} |
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module.exports = readShebang;
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