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The flag ‘--check’ to ‘nix-store -r’ or ‘nix-build’ will cause Nix to
redo the build of a derivation whose output paths are already valid.
If the new output differs from the original output, an error is
printed. This makes it easier to test if a build is deterministic.
(Obviously this cannot catch all sources of non-determinism, but it
catches the most common one, namely the current time.)
For example:
$ nix-build '<nixpkgs>' -A patchelf
...
$ nix-build '<nixpkgs>' -A patchelf --check
error: derivation `/nix/store/1ipvxsdnbhl1rw6siz6x92s7sc8nwkkb-patchelf-0.6' may not be deterministic: hash mismatch in output `/nix/store/4pc1dmw5xkwmc6q3gdc9i5nbjl4dkjpp-patchelf-0.6.drv'
The --check build fails if not all outputs are valid. Thus the first
call to nix-build is necessary to ensure that all outputs are valid.
The current outputs are left untouched: the new outputs are either put
in a chroot or diverted to a different location in the store using
hash rewriting.
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Its linker is too old to understand --no-copy-dt-needed-entries.
http://hydra.nixos.org/build/9113883
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Mac OS X doesn't allow renaming a read-only directory.
http://hydra.nixos.org/build/9113895
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In particular, do replacing of valid paths during repair later. This
prevents us from replacing a valid path after the build fails.
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E.g. "--max-freed 10G" means "free ten gigabytes".
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This will allow Hydra to detect that a build should not be marked as
"permanently failed", allowing it to be retried later.
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Since normal builds don't execute shellHook, this allows nix-shell
specific customisation. Suggested by Domen.
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Closes #208.
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"echo -n" doesn't work with /bin/sh on Darwin.
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The tarball can now be unpacked anywhere. The installation script
uses "sudo" to create /nix if it doesn't exist. It also fetches the
nixpkgs-unstable channel.
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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This substituter connects to a remote host, runs nix-store --serve
there, and then forwards substituter commands on to the remote host and
sends their results to the calling program. The ssh-substituter-hosts
option can be specified as a list of hosts to try.
This is an initial implementation and, while it works, it has some
limitations:
* Only the first host is used
* There is no caching of query results (all queries are sent to the
remote machine)
* There is no informative output (such as progress bars)
* Some failure modes may cause unhelpful error messages
* There is no concept of trusted-ssh-substituter-hosts
Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Also remove signing support
Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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nix-store --export takes a tmproot, which can only release by exiting.
Substituters don't currently work in a way that could take advantage of
the looping, anyway.
Signed-off-by: Shea Levy <shea@shealevy.com>
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This is essentially the substituter API operating on the local store,
which will be used by the ssh substituter. It runs in a loop rather than
just taking one command so that in the future nix will be able to keep
one connection open for multiple instances of the substituter.
Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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Signed-off-by: Shea Levy <shea@shealevy.com>
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This allows running nix-instantiate --eval-only without performing the
evaluation in readonly mode, letting features like import from
derivation and automatic substitution of builtins.storePath paths work.
Signed-off-by: Shea Levy <shea@shealevy.com>
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Issue #202.
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http://hydra.nixos.org/build/8715639
Not sure why this causes a failure now.
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http://hydra.nixos.org/build/8715502
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