103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
#include "values.hh"
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#include "globals.hh"
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#include "db.hh"
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static void copyFile(string src, string dst)
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{
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int res = system(("cat " + src + " > " + dst).c_str()); /* !!! escape */
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if (WEXITSTATUS(res) != 0)
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throw Error("cannot copy " + src + " to " + dst);
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}
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static string absValuePath(string s)
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{
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return nixValues + "/" + s;
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}
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Hash addValue(string path)
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{
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path = absPath(path);
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Hash hash = hashPath(path);
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string name;
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if (queryDB(nixDB, dbRefs, hash, name)) {
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debug((string) hash + " already known");
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return hash;
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}
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string baseName = baseNameOf(path);
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string targetName = (string) hash + "-" + baseName;
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copyFile(path, absValuePath(targetName));
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setDB(nixDB, dbRefs, hash, targetName);
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return hash;
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}
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#if 0
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/* Download object referenced by the given URL into the sources
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directory. Return the file name it was downloaded to. */
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string fetchURL(string url)
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{
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string filename = baseNameOf(url);
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string fullname = nixSourcesDir + "/" + filename;
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struct stat st;
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if (stat(fullname.c_str(), &st)) {
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cerr << "fetching " << url << endl;
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/* !!! quoting */
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string shellCmd =
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"cd " + nixSourcesDir + " && wget --quiet -N \"" + url + "\"";
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int res = system(shellCmd.c_str());
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if (WEXITSTATUS(res) != 0)
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throw Error("cannot fetch " + url);
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}
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return fullname;
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}
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#endif
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string queryValuePath(Hash hash)
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{
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bool checkedNet = false;
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while (1) {
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string name, url;
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if (queryDB(nixDB, dbRefs, hash, name)) {
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string fn = absValuePath(name);
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/* Verify that the file hasn't changed. !!! race !!! slow */
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if (hashPath(fn) != hash)
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throw Error("file " + fn + " is stale");
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return fn;
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}
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throw Error("a file with hash " + (string) hash + " is required, "
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"but it is not known to exist locally or on the network");
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#if 0
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if (checkedNet)
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throw Error("consistency problem: file fetched from " + url +
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" should have hash " + (string) hash + ", but it doesn't");
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if (!queryDB(nixDB, dbNetSources, hash, url))
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throw Error("a file with hash " + (string) hash + " is required, "
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"but it is not known to exist locally or on the network");
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checkedNet = true;
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fn = fetchURL(url);
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setDB(nixDB, dbRefs, hash, fn);
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#endif
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}
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}
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