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* Make nix-env --dry-run print the paths to be substituted correctly

Browse source 
again.  (After the previous substituter mechanism refactoring I
  didn't update the code that obtains the references of substitutable
  paths.)  This required some refactoring: the substituter programs
  are now kept running and receive/respond to info requests via
  stdin/stdout.
This commit is contained in:
Eelco Dolstra 2008-08-02 12:54:35 +00:00
parent fc691e1cbd
commit 3c92ea399d
14 changed files with 338 additions and 272 deletions
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22
src/libutil/util.cc
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@ -579,7 +579,14 @@ AutoCloseFD::AutoCloseFD(int fd)
AutoCloseFD::AutoCloseFD(const AutoCloseFD & fd)
{
abort();
/* Copying a AutoCloseFD isn't allowed (who should get to close
it?). But as a edge case, allow copying of closed
AutoCloseFDs. This is necessary due to tiresome reasons
involving copy constructor use on default object values in STL
containers (like when you do `map[value]' where value isn't in
the map yet). */
this->fd = fd.fd;
if (this->fd != -1) abort();
}
@ -832,7 +839,7 @@ string runProgram(Path program, bool searchPath, const Strings & args)
pipe.readSide.close();
if (dup2(pipe.writeSide, STDOUT_FILENO) == -1)
throw SysError("dupping from-hook write side");
throw SysError("dupping stdout");
std::vector<const char *> cargs; /* careful with c_str()! */
cargs.push_back(program.c_str());
@ -868,6 +875,17 @@ string runProgram(Path program, bool searchPath, const Strings & args)
}
void closeMostFDs(const set<int> & exceptions)
{
int maxFD = 0;
maxFD = sysconf(_SC_OPEN_MAX);
for (int fd = 0; fd < maxFD; ++fd)
if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO
&& exceptions.find(fd) == exceptions.end())
close(fd); /* ignore result */
}
void quickExit(int status)
{
#ifdef __CYGWIN__