Age | Commit message (Collapse) | Author | Files | Lines |
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This is a problem because one process may set the immutable bit before
the second process has created its link.
Addressed random Hydra failures such as:
error: cannot rename `/nix/store/.tmp-link-17397-1804289383' to
`/nix/store/rsvzm574rlfip3830ac7kmaa028bzl6h-nixos-0.1pre-git/upstart-interface-version':
Operation not permitted
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Put all Nix configuration flags in a Settings object.
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E.g. Darwin doesn't allow this.
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Auto-optimisation is enabled by default. It can be turned off by
setting auto-optimise-store to false in nix.conf.
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optimiseStore() now creates persistent, content-addressed hard links
in /nix/store/.links. For instance, if it encounters a file P with
hash H, it will create a hard link
P' = /nix/store/.link/<H>
to P if P' doesn't already exist; if P' exist, then P is replaced by a
hard link to P'. This is better than the previous in-memory map,
because it had the tendency to unnecessarily replace hard links with a
hard link to whatever happened to be the first file with a given hash
it encountered. It also allows on-the-fly, incremental optimisation.
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I was bitten one time too many by Python modifying the Nix store by
creating *.pyc files when run as root. On Linux, we can prevent this
by setting the immutable bit on files and directories (as in ‘chattr
+i’). This isn't supported by all filesystems, so it's not an error
if setting the bit fails. The immutable bit is cleared by the garbage
collector before deleting a path. The only tricky aspect is in
optimiseStore(), since it's forbidden to create hard links to an
immutable file. Thus optimiseStore() temporarily clears the immutable
bit before creating the link.
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size of the NAR serialisation of the path, i.e., `nix-store --dump
PATH'). This is useful for Hydra.
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from failing on rename() on BtrFS.
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(There can easily be more than 32000 occurrences of the empty file.)
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* The garbage collector now also prints the number of blocks freed.
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https://svn.nixos.org/repos/nix/nix/branches/no-bdb).
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