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Nix
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* Refactoring.

This commit is contained in:
Eelco Dolstra 2003-03-24 11:50:20 +00:00
parent 8d682ba551
commit 9d2f128252
1 changed files with 37 additions and 66 deletions
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103
src/nix.cc
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@ -4,6 +4,7 @@
#include <string>
#include <sstream>
#include <list>
#include <map>
#include <cstdio>
#include <unistd.h>
@ -225,22 +226,17 @@ void readPkgDescr(const string & pkgfile,
string getPkg(string hash);
typedef pair<string, string> EnvPair;
typedef list<EnvPair> Environment;
typedef map<string, string> Environment;
void installPkg(string hash)
void fetchDeps(string hash, Environment & env)
{
string pkgfile;
string src;
string path;
string cmd;
string builder;
if (!queryDB(dbRefs, hash, pkgfile))
throw Error("unknown package " + hash);
cerr << "installing package " + hash + " from " + pkgfile + "\n";
cerr << "reading information about " + hash + " from " + pkgfile + "\n";
/* Verify that the file hasn't changed. !!! race */
if (makeRef(pkgfile) != hash)
@ -252,15 +248,13 @@ void installPkg(string hash)
/* Recursively fetch all the dependencies, filling in the
environment as we go along. */
Environment env;
for (DepList::iterator it = pkgImports.begin();
it != pkgImports.end(); it++)
{
cerr << "fetching package dependency "
<< it->name << " <- " << it->ref
<< endl;
env.push_back(EnvPair(it->name, getPkg(it->ref)));
env[it->name] = getPkg(it->ref);
}
for (DepList::iterator it = fileImports.begin();
@ -278,15 +272,34 @@ void installPkg(string hash)
if (makeRef(file) != it->ref)
throw Error("file " + file + " is stale");
if (it->name == "build")
builder = file;
else
env.push_back(EnvPair(it->name, file));
env[it->name] = file;
}
}
if (builder == "")
throw Error("no builder specified");
string getFromEnv(const Environment & env, const string & key)
{
Environment::const_iterator it = env.find(key);
if (it == env.end())
throw Error("key " + key + " not found in the environment");
return it->second;
}
void installPkg(string hash)
{
string pkgfile;
string src;
string path;
string cmd;
string builder;
Environment env;
/* Fetch dependencies. */
fetchDeps(hash, env);
builder = getFromEnv(env, "build");
/* Construct a path for the installed package. */
path = pkgHome + "/" + hash;
@ -361,62 +374,17 @@ string getPkg(string hash)
void runPkg(string hash)
{
string pkgfile;
string src;
string path;
string cmd;
string runner;
if (!queryDB(dbRefs, hash, pkgfile))
throw Error("unknown package " + hash);
cerr << "running package " + hash + " from " + pkgfile + "\n";
/* Verify that the file hasn't changed. !!! race */
if (makeRef(pkgfile) != hash)
throw Error("file " + pkgfile + " is stale");
/* Read the package description file. */
DepList pkgImports, fileImports;
readPkgDescr(pkgfile, pkgImports, fileImports);
/* Recursively fetch all the dependencies, filling in the
environment as we go along. */
Environment env;
for (DepList::iterator it = pkgImports.begin();
it != pkgImports.end(); it++)
{
cerr << "fetching package dependency "
<< it->name << " <- " << it->ref
<< endl;
env.push_back(EnvPair(it->name, getPkg(it->ref)));
}
for (DepList::iterator it = fileImports.begin();
it != fileImports.end(); it++)
{
cerr << "fetching file dependency "
<< it->name << " = " << it->ref
<< endl;
string file;
if (!queryDB(dbRefs, it->ref, file))
throw Error("unknown file " + it->ref);
if (makeRef(file) != it->ref)
throw Error("file " + file + " is stale");
if (it->name == "run")
runner = file;
else
env.push_back(EnvPair(it->name, file));
}
if (runner == "")
throw Error("no runner specified");
/* Fetch dependencies. */
fetchDeps(hash, env);
runner = getFromEnv(env, "run");
/* Fork a child to build the package. */
pid_t pid;
switch (pid = fork()) {
@ -612,6 +580,9 @@ Subcommands:
Ensure that the package referenced by HASH is installed. Prints
out the path of the package on stdout.
listinst
Prints a list of installed packages.
run HASH
Run the descriptor referenced by HASH.
";