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* nix-store, nix-instantiate: added an option `--add-root' to

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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.
This commit is contained in:
Eelco Dolstra 2005-02-01 12:36:25 +00:00
parent a6b65fd5e1
commit dcc37c236c
11 changed files with 165 additions and 17 deletions
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4
src/nix-instantiate/help.txt
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@ -1,6 +1,6 @@
nix-instantiate [OPTIONS...] [FILES...]
`nix-instantiate' turns Nix expressions into store expressions.
`nix-instantiate' turns Nix expressions into store derivations.
The argument `-' may be specified to read a Nix expression from
standard input.
@ -14,3 +14,5 @@ Options:
--eval-only: evaluate and print resulting term; do not instantiate
--parse-only: parse and print abstract syntax tree
--add-root: add garbage collector roots for the result