Commit graph

755 commits

Author SHA1 Message Date
Eelco Dolstra
2e6bf723e4 * Added a global configuration file (/nix/etc/nix/nix.conf). It
contains options for the garbage collector right now, but other
  stuff can be added here later.
2005-02-01 20:53:14 +00:00
Eelco Dolstra
9f6835c282 * Remove debug code. 2005-02-01 17:52:11 +00:00
Eelco Dolstra
c3981d81f6 * Make check fixes. 2005-02-01 17:50:48 +00:00
Eelco Dolstra
65b6c8ab4c * Move root finding from nix-collect-garbage' to nix-store --gc'.
This was necessary becase root finding must be done after
  acquisition of the global GC lock.

  This makes `nix-collect-garbage' obsolete; it is now just a wrapper
  around `nix-store --gc'.

* Automatically remove stale GC roots (i.e., indirect GC roots that
  point to non-existent paths).
2005-02-01 15:05:32 +00:00
Eelco Dolstra
630ae0c9d7 * nix-build: use an indirection scheme to make it easier for users to
get rid of GC roots.  Nix-build places a symlink `result' in the
  current directory.  Previously, removing that symlink would not
  remove the store path being linked to as a GC root.  Now, the GC
  root created by nix-build is actually a symlink in
  `/nix/var/nix/gcroots/auto' to `result'.  So if that symlink is
  removed the GC root automatically becomes invalid (since it can no
  longer be resolved).  The root itself is not automatically removed -
  the garbage collector should delete dangling roots.
2005-02-01 13:48:46 +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
a6b65fd5e1 * Get rid of hardcoded paths. 2005-02-01 09:54:56 +00:00
Eelco Dolstra
06b4424286 * Add missing files to dist.
* Fix GC and substitute bugs related to self-references.  Add a
  regression test.
2005-02-01 09:23:38 +00:00
Eelco Dolstra
32fa82a56a * Acquire a global GC lock to prevent new temporary root files from
being created after the garbage collector has read the temproots
  directory.  This blocks the creation of new processes, but the
  garbage collector could periodically release the GC lock to allow
  them to run.
2005-01-31 22:23:49 +00:00
Eelco Dolstra
89c9bc11ab * Add a test for a more subtle race: a process starting after the
temporary root files have been read but creating outputs before the
  store directory has been read.
2005-01-31 22:01:55 +00:00
Eelco Dolstra
207bdcbe86 * Automatically remove temporary root files. 2005-01-31 21:20:59 +00:00
Eelco Dolstra
252c9c91ab * Topologically sort paths under the references relation to ensure
that they are deleted in an order that maintains the closure
  invariant.
* Presence of a path in a temporary roots file does not imply that all
  paths in its closure are also present, so add the closure.
2005-01-31 14:00:43 +00:00
Eelco Dolstra
33c5d23b81 * Don't delete active lock files. 2005-01-31 12:19:53 +00:00
Eelco Dolstra
1328aa3307 * Start of concurrent garbage collection. Processes write temporary
roots to a per-process temporary file in /nix/var/nix/temproots
  while holding a write lock on that file.  The garbage collector
  acquires read locks on all those files, thus blocking further
  progress in other Nix processes, and reads the sets of temporary
  roots.
2005-01-31 10:27:25 +00:00
Eelco Dolstra
a7668411a1 * Add a test to check whether concurrent garbage collection (i.e.,
running the collector while builds are in progress) works
  correctly.  The test currently fails.
2005-01-28 20:36:46 +00:00
Eelco Dolstra
22cfdfa246 * Use NIX_STORE environment variable to locate the store (in addition
to NIX_STORE_DIR) so that Nix invocations in builders in `make
  check' work correctly if the store doesn't exist.
2005-01-28 13:19:16 +00:00
Eelco Dolstra
9ab0bc9395 * Another horrible `make check' hack. 2005-01-28 11:05:56 +00:00
Eelco Dolstra
0ea8b6993a * Only invalidate paths when they are in fact valid. 2005-01-28 11:05:46 +00:00
Eelco Dolstra
ac2f665853 * Set execute permission. 2005-01-27 19:15:12 +00:00
Eelco Dolstra
a85d1849af * Missing dependency; only a problem when building from Subversion. 2005-01-27 19:00:48 +00:00
Eelco Dolstra
e5c16c9582 * Add missing substitutes files to dist.
* Add a garbage collector test.
2005-01-27 17:48:50 +00:00
Eelco Dolstra
8a3eef22e3 * Fix deadlock. 2005-01-27 17:48:14 +00:00
Eelco Dolstra
c60a4943ba * Update referers mappings when updating/clearing the references
mapping.
* Do things in the right order in invalidatePath().
2005-01-27 16:18:39 +00:00
Eelco Dolstra
4e37548a1e * Remove deleted files from EXTRA_DIST (again). 2005-01-27 15:31:49 +00:00
Eelco Dolstra
c505702265 * Fix and simplify the garbage collector (it's still not concurrent,
though).  In particular it's now much easier to register a GC root.
  Just place a symlink to whatever store path it is that you want to
  keep in /nix/var/nix/gcroots.
2005-01-27 15:21:29 +00:00
Eelco Dolstra
59682e6188 * Make lock removal safe by signalling to blocked processes that the
lock they are waiting on has become stale (we do this by writing a
  meaningless token to the unlinked file).
2005-01-27 12:19:25 +00:00
Eelco Dolstra
a24b78e9f1 * Maintain the references/referers relation also for derivations.
This simplifies garbage collection and `nix-store --query
  --requisites' since we no longer need to treat derivations
  specially.

* Better maintaining of the invariants, e.g., setReferences() can only
  be called on a valid/substitutable path.
2005-01-25 21:28:25 +00:00
Eelco Dolstra
2a2756b856 * Simplification: registerSubstitutes -> registerSubstitute. We no
longer need the former since there we no longer have the
  substitutes-rev table (which triggered a O(n^2) cost in updating
  them).
2005-01-25 20:27:40 +00:00
Eelco Dolstra
a9340fa672 * Remove removed files from EXTRA_DIST. 2005-01-25 17:25:20 +00:00
Eelco Dolstra
498f4915cc * Re-enable all tests. 2005-01-25 17:24:14 +00:00
Eelco Dolstra
066da4ab85 * Really fix the substitute mechanism, i.e., ensure the closure
invariant by registering references through the manifest.
* Added a test for nix-pull.
2005-01-25 17:08:52 +00:00
Eelco Dolstra
c6290e42bc * Fix the `--fallback' switch.
* Fix the substitutes tests.
2005-01-25 13:00:12 +00:00
Eelco Dolstra
581fc47783 * Fix the build hook mechanism; pass the pointer graph to the hook. 2005-01-25 11:55:43 +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
6a0a2d5593 * Terminology fixes. 2005-01-20 16:01:07 +00:00
Eelco Dolstra
6bb5efadec * Ensure that derivation names and sources don't end in `.drv'. 2005-01-20 15:25:01 +00:00
Eelco Dolstra
05f0430de1 * Another change to low-level derivations. The last one this year, I
promise :-) This allows derivations to specify on *what* output
  paths of input derivations they are dependent.  This helps to
  prevent unnecessary downloads.  For instance, a build might be
  dependent on the `devel' and `lib' outputs of some library
  component, but not the `docs' output.
2005-01-20 14:10:19 +00:00
Eelco Dolstra
6ff48e77f6 * Set the Perl search path properly (reported by Roy van den Broek). 2005-01-19 21:55:02 +00:00
Eelco Dolstra
e0f4e587c3 * Nix-store queries --references' and referers' to query the pointer
graph.  That is, `nix-store --query --references PATH' shows the set
  of paths referenced by PATH, and `nix-store --query --referers PATH'
  shows the set of paths referencing PATH.
2005-01-19 16:59:56 +00:00
Eelco Dolstra
96de272b48 * Renamed normalise.cc' -> build.cc', `storeexprs.cc' ->
`derivations.cc', etc.
* Store the SHA-256 content hash of store paths in the database after
  they have been built/added.  This is so that we can check whether
  the store has been messed with (a la `rpm --verify').
* When registering path validity, verify that the closure property
  holds.
2005-01-19 16:39:47 +00:00
Eelco Dolstra
ef5f254a55 * `nix-store --build' now builds its arguments in parallel instead of
sequentially (within the limits set by `--jobs').  This should
  greatly improve the utilisation of the build farm when doing Nixpkgs
  builds.
2005-01-19 15:02:02 +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
863dcff6c5 * Started removing closure store expressions, i.e., the explicit
representation of closures as ATerms in the Nix store.  Instead, the
  file system pointer graph is now stored in the Nix database.  This
  has many advantages:

  - It greatly simplifies the implementation (we can drop the notion
    of `successors', and so on).

  - It makes registering roots for the garbage collector much easier.
    Instead of specifying the closure expression as a root, you can
    simply specify the store path that must be retained as a root.
    This could not be done previously, since there was no way to find
    the closure store expression containing a given store path.
    
  - Better traceability: it is now possible to query what paths are
    referenced by a path, and what paths refer to a path.
2005-01-19 11:16:11 +00:00
Eelco Dolstra
e9762e2d10 * Support arities > 6. 2005-01-19 11:04:24 +00:00
Eelco Dolstra
6d493751c3 * Get --readonly-mode to work again. 2005-01-18 11:15:50 +00:00
Eelco Dolstra
32aac8748a * Actually check that the result of fixed-output derivations matches
the specified hash.
2005-01-17 19:01:48 +00:00
Eelco Dolstra
f3dc231250 * Removed the `id' attribute hack.
* Formalise the notion of fixed-output derivations, i.e., derivations
  for which a cryptographic hash of the output is known in advance.
  Changes to such derivations should not propagate upwards through the
  dependency graph.  Previously this was done by specifying the hash
  component of the output path through the `id' attribute, but this is
  insecure since you can lie about it (i.e., you can specify any hash
  and then produce a completely different output).  Now the
  responsibility for checking the output is moved from the builder to
  Nix itself.

  A fixed-output derivation can be created by specifying the
  `outputHash' and `outputHashAlgo' attributes, the latter taking
  values `md5', `sha1', and `sha256', and the former specifying the
  actual hash in hexadecimal or in base-32 (auto-detected by looking
  at the length of the attribute value).  MD5 is included for
  compatibility but should be considered deprecated.

* Removed the `drvPath' pseudo-attribute in derivation results.  It's
  no longer necessary.

* Cleaned up the support for multiple output paths in derivation store
  expressions.  Each output now has a unique identifier (e.g., `out',
  `devel', `docs').  Previously there was no way to tell output paths
  apart at the store expression level.

* `nix-hash' now has a flag `--base32' to specify that the hash should
  be printed in base-32 notation.

* `fetchurl' accepts parameters `sha256' and `sha1' in addition to
  `md5'.

* `nix-prefetch-url' now prints out a SHA-1 hash in base-32.  (TODO: a
  flag to specify the hash.)
2005-01-17 16:55:19 +00:00
Eelco Dolstra
d58a11e019 * Shorten SHA-256 hashes used in store path name generation to 160
bits, then encode them in a radix-32 representation (using digits
  and letters except e, o, u, and t).  This produces store paths like
  /nix/store/4i0zb0z7f88mwghjirkz702a71dcfivn-aterm-2.3.1.  The nice
  thing about this is that the hash part of the file name is still 32
  characters, as before with MD5.

  (Of course, shortening SHA-256 to 160 bits makes it no better than
  SHA-160 in theory, but hopefully it's a bit more resistant to
  attacks; it's certainly a lot slower.)
2005-01-14 16:04:03 +00:00
Eelco Dolstra
9530cc3170 * Start move towards SHA-256 hashes instead of MD5.
* Start cleaning up unique store path generation (they weren't always
  unique; in particular the suffix ("-aterm-2.2", "-builder.sh") was
  not part of the hash, therefore changes to the suffix would cause
  multiple store objects with the same hash).
2005-01-14 13:51:38 +00:00