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8 commits

Author SHA1 Message Date
Eelco Dolstra e0181f56be * `nix-store -q --tree' shows a tree representing the dependency graph
of the given derivation.  Useful for getting a quick overview of how
  something was built.  E.g., to find out how the `baffle' program in
  your user environment was built, you can do

    $ nix-store -q --tree $(nix-store -qd $(which baffle))

  Tree nesting depth is minimised (?) by topologically sorting paths
  under the relation A < B iff A \in closure(B).
2005-02-17 15:57:46 +00:00
Eelco Dolstra dcc37c236c * nix-store, nix-instantiate: added an option `--add-root' to
immediately add the result as a permanent GC root.  This is the only
  way to prevent a race with the garbage collector.  For instance, the
  old style

    ln -s $(nix-store -r $(nix-instantiate foo.nix)) \
      /nix/var/nix/gcroots/result

  has two time windows in which the garbage collector can interfere
  (by GC'ing the derivation and the output, respectively).  On the
  other hand,

    nix-store --add-root /nix/var/nix/gcroots/result -r \
      $(nix-instantiate --add-root /nix/var/nix/gcroots/drv \
        foo.nix)

  is safe.

* nix-build: use `--add-root' to prevent GC races.
2005-02-01 12:36:25 +00:00
Eelco Dolstra 52bf9b86bb * In nix-store: added query `--referers-closure' that returns the
closure of the referers relation rather than the references
  relation, i.e., the set of all paths that directly or indirectly
  refer to the given path.  Note that contrary to the references
  closure this set is not fixed; it can change as paths are added to
  or removed from the store.
2005-01-25 11:18:03 +00:00
Eelco Dolstra 80faa2f98a * In nix-store: change --build' back to --realise'. Also brought
back the query flag `--force-realise'.
* Fixed some of the tests.
2005-01-25 10:55:33 +00:00
Eelco Dolstra 06c77bf7a8 * Change extension .store' to .drv'.
* Re-enable `nix-store --query --requisites'.
2005-01-19 14:36:00 +00:00
Eelco Dolstra fa9259f5f5 * Simplify the substitute mechanism:
- Drop the store expression.  So now a substitute is just a
    command-line invocation (a program name + arguments).  If you
    register a substitute you are responsible for registering the
    expression that built it (if any) as a root of the garbage
    collector.
  - Drop the substitutes-rev DB table.
2004-12-20 13:43:32 +00:00
Eelco Dolstra 76c0e85929 * The environment variable NIX_ROOT can now be set to execute Nix in a
chroot() environment.
* A operation `--validpath' to register path validity.  Useful for
  bootstrapping in a pure Nix environment.
* Safety checks: ensure that files involved in store operations are in
  the store.
2004-02-14 21:44:18 +00:00
Eelco Dolstra dfc9c64ead * "Fix expression" -> "Nix expression".
* More refactoring.
2003-11-18 12:06:07 +00:00
Renamed from src/nix-store/nix-help.txt (Browse further)