diff options
| author | Eelco Dolstra <e.dolstra@tudelft.nl> | 2005-02-01T12·36+0000 |
|---|---|---|
| committer | Eelco Dolstra <e.dolstra@tudelft.nl> | 2005-02-01T12·36+0000 |
| commit | dcc37c236c66ba463bd61fec23d046485d8a412f (patch) | |
| tree | b1a34feaf2a9a0ca0e0bad89c1671289de9e19d2 /src/libstore/gc.hh | |
| parent | a6b65fd5e107416588a6572a88518d8816abcb12 (diff) | |
* 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.
Diffstat (limited to 'src/libstore/gc.hh')
| -rw-r--r-- | src/libstore/gc.hh | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstore/gc.hh b/src/libstore/gc.hh index 91c5be91406b..03e1d769153b 100644 --- a/src/libstore/gc.hh +++ b/src/libstore/gc.hh @@ -26,5 +26,8 @@ void addTempRoot(const Path & path); as a (permanent) root. */ void removeTempRoots(); +/* Register a permanent GC root. */ +Path addPermRoot(const Path & storePath, const Path & gcRoot); + #endif /* !__GC_H */ |