95 lines
2.1 KiB
C++
95 lines
2.1 KiB
C++
#include "util.hh"
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string thisSystem = SYSTEM;
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string nixHomeDir = "/nix";
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string nixHomeDirEnvVar = "NIX";
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string absPath(string filename, string dir)
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{
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if (filename[0] != '/') {
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if (dir == "") {
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char buf[PATH_MAX];
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if (!getcwd(buf, sizeof(buf)))
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throw Error("cannot get cwd");
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dir = buf;
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}
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filename = dir + "/" + filename;
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/* !!! canonicalise */
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char resolved[PATH_MAX];
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if (!realpath(filename.c_str(), resolved))
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throw Error("cannot canonicalise path " + filename);
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filename = resolved;
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}
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return filename;
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}
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static string printHash(unsigned char * buf)
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{
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ostringstream str;
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for (int i = 0; i < 16; i++) {
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str.fill('0');
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str.width(2);
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str << hex << (int) buf[i];
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}
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return str.str();
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}
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/* Verify that a reference is valid (that is, is a MD5 hash code). */
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bool isHash(const string & s)
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{
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if (s.length() != 32) return false;
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for (int i = 0; i < 32; i++) {
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char c = s[i];
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if (!((c >= '0' && c <= '9') ||
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(c >= 'a' && c <= 'f')))
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return false;
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}
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return true;
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}
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void checkHash(const string & s)
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{
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if (!isHash(s)) throw BadRefError("invalid reference: " + s);
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}
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/* Compute the MD5 hash of a file. */
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string hashFile(string filename)
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{
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unsigned char hash[16];
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FILE * file = fopen(filename.c_str(), "rb");
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if (!file)
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throw BadRefError("file `" + filename + "' does not exist");
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int err = md5_stream(file, hash);
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fclose(file);
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if (err) throw BadRefError("cannot hash file");
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return printHash(hash);
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}
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/* Return the directory part of the given path, i.e., everything
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before the final `/'. */
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string dirOf(string s)
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{
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unsigned int pos = s.rfind('/');
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if (pos == string::npos) throw Error("invalid file name");
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return string(s, 0, pos);
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}
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/* Return the base name of the given path, i.e., everything following
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the final `/'. */
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string baseNameOf(string s)
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{
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unsigned int pos = s.rfind('/');
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if (pos == string::npos) throw Error("invalid file name");
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return string(s, pos + 1);
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}
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