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search.cc: improve UX for `nix search`
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As proposed in #1634 the `nix search` command could use some
improvements. Initially 0413aeb35d6ee869a98b6565781c1cf47dc80080 added
some basic sorting behavior using `std::map`, a next step would be an
improvement of the output.
This patch includes the following changes:
* Use `$PAGER` for outputs with `RunPager` from `shared.hh`:
The same behavior is defined for `nix-env --query`, furthermore it
makes searching huge results way easier.
* Simplified result blocks:
The new output is heavily inspired by the output from `nox`, the first
line shows the attribute path and the derivaiton name
(`attribute path (derivation name)`) and the description in the second
line.
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Slightly nicer behavior when updates are somewhat far apart
(during a long linking step, perhaps) ensuring things
don't appear unresponsive.
If we wait the maximum amount for the update,
don't bother waiting another 50ms (for rate-limiting purposes)
and just check if we should quit.
This also ensures we'll notice the request to quit within 1s
if quit is signalled but there is not an udpate.
(I'm not sure if this happens or not)
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This makes 'nix copy' and 'nix path-info' work on .drv store
paths. Removing special treatment of .drv files seems the most
future-proof approach given the possible removal of .drv files in the
future.
Note that 'nix build' will still build (rather than substitute) .drv
paths due to the unfortunate overloading in Store::buildPaths().
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EvalState contains a few counters (e.g. nrValues) that increase
quickly enough that they end up being interpreted as pointers by the
garbage collector. Moving it to the heap makes them invisible to the
garbage collector.
This reduces the max RSS doing 100 evaluations of
nixos.tests.firefox.x86_64-linux.drvPath from 455 MiB to 292 MiB.
Note: ideally, allocations would be much further up in the 64-bit
address space to reduce the odds of an integer being misinterpreted as
a pointer. Maybe we can use some linker magic to move the .bss segment
to a higher address.
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Allow global config settings to be defined in multiple Config
classes. For example, this means that libutil can have settings and
evaluator settings can be moved out of libstore. The Config classes
are registered in a new GlobalConfig class to which config files
etc. are applied.
Relevant to https://github.com/NixOS/nix/issues/2009 in that it
removes the need for ad hoc handling of useCaseHack, which was the
underlying cause of that issue.
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The common use case is to search for packages containing multiple words
like a "git" "frontend". Having only one expressions makes this simple regular
use case very complicated. Instead, search accepts multiple regular epressions
which all need to match.
nix search git 'gui|frontend'
returns a list of all git uis for example
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Fixes #2079.
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Fixes #2076
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I couldn't find a good example how to use it with non-us-east-1 buckets.
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Fixes https://github.com/NixOS/nixpkgs/issues/37114.
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nix search: tests and fix #1893 and part of #1892
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Note that clearenv() is not available on macOS.
Fixes #1907.
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This is important since this is given as an example.
Other patterns containing "empty search string" will still
be handled differently on different platforms ("asdf|")
but that's less of an issue.
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This is exposed by the tests added previously,
and resolves the error reported in #1892:
"expected JSON value".
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Alos add a command "nix ping-store" to make it easier to see if Nix
can connect to a remote builder (e.g. 'nix ping-store --store
ssh://mac').
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maybe a left-over from nix-store -r ?
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Also add some examples to nix --help.
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nix-store --export, nix-store --dump, and nix dump-path would previously
fail silently if writing the data out failed, because
a) FdSink::write ignored exceptions, and
b) the commands relied on FdSink's destructor, which ignores
exceptions, to flush the data out.
This could cause rather opaque issues with installing nixos, because
nix-store --export would happily proceed even if it couldn't write its
data out (e.g. if nix-store --import on the other side of the pipe
failed).
This commit adds tests that expose these issues in the nix-store
commands, and fixes them for all three.
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All plugins in plugin-files will be dlopened, allowing them to
statically construct instances of the various Register* types Nix
supports.
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Fixes #1849.
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All ANSI sequences except color setting are now filtered out. In
particular, terminal resets (such as from NixOS VM tests) are filtered
out.
Also, fix the completely broken tab character handling.
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Fixes #1834.
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Say "copying" instead of "fetching" when copying from another local
store. Nice for nixos-install.
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This command upgrades Nix to the latest stable version by installing a
store path obtained from
https://github.com/NixOS/nixpkgs/raw/master/nixos/modules/installer/tools/nix-fallback-paths.nix
which is the same store path that the installer at
https://nixos.org/nix/install.sh uses.
The upgrade fails if Nix is not installed in a profile (e.g. on NixOS,
or when installed outside of the Nix store).
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Thus --json no longer produces a list.
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parseExprFromFile() should be avoided since it doesn't cache anything.
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Fixes #1757.
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(appease clang -Wmismatched-tags warning)
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Thus,
$ nix eval --raw '("foo")'
foo
$ nix eval --raw nixpkgs.hello
/nix/store/1y6ckg6khrdsvll54s5spcmf3w6ka9k4-hello-2.10
$ nix eval --raw '(/etc/resolv.conf)'
/nix/store/vml92ama92i8mz013nny461mlvg8mvap-resolv.conf
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Parenthetical to #1686, we don't need to create a new root if we can
just bind-mount on top of the existing /nix/store.
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Fixes #1686.
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