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* Get rid of the substitutes database table (NIX-47). Instead, if we

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need any info on substitutable paths, we just call the substituters
  (such as download-using-manifests.pl) directly.  This means that
  it's no longer necessary for nix-pull to register substitutes or for
  nix-channel to clear them, which makes those operations much faster
  (NIX-95).  Also, we don't have to worry about keeping nix-pull
  manifests (in /nix/var/nix/manifests) and the database in sync with
  each other.

  The downside is that there is some overhead in calling an external
  program to get the substitutes info.  For instance, "nix-env -qas"
  takes a bit longer.

  Abolishing the substitutes table also makes the logic in
  local-store.cc simpler, as we don't need to store info for invalid
  paths.  On the downside, you cannot do things like "nix-store -qR"
  on a substitutable but invalid path (but nobody did that anyway).

* Never catch interrupts (the Interrupted exception).
This commit is contained in:
Eelco Dolstra 2007-08-12 00:29:28 +00:00
parent 4695f4edd6
commit 9e975458b4
24 changed files with 357 additions and 469 deletions
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7
src/libutil/util.cc
View file

@ -23,13 +23,13 @@ extern char * * environ;
namespace nix {
Error::Error(const format & f)
BaseError::BaseError(const format & f)
{
err = f.str();
}
Error & Error::addPrefix(const format & f)
BaseError & BaseError::addPrefix(const format & f)
{
err = f.str() + err;
return *this;
@ -491,6 +491,7 @@ string drainFD(int fd)
string result;
unsigned char buffer[4096];
while (1) {
checkInterrupt();
ssize_t rd = read(fd, buffer, sizeof buffer);
if (rd == -1) {
if (errno != EINTR)
@ -775,6 +776,8 @@ void killUser(uid_t uid)
string runProgram(Path program, bool searchPath, const Strings & args)
{
checkInterrupt();
/* Create a pipe. */
Pipe pipe;
pipe.create();