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7659 commits

Author SHA1 Message Date
Eelco Dolstra 404a94ab69 Tweak README.md 2020-05-01 11:47:26 +02:00
Domen Kožar 93874cc18a
Merge pull request #3552 from gilligan/revamp-readme
Revamp README.md
2020-05-01 11:23:08 +02:00
Domen Kožar 2a434fc62b
Update README.md 2020-05-01 11:20:39 +02:00
Domen Kožar 30616d8e86
Update README.md
Co-authored-by: worldofpeace <worldofpeace@protonmail.ch>
2020-05-01 11:19:18 +02:00
Domen Kožar 536512d273
Update README.md
Co-authored-by: worldofpeace <worldofpeace@protonmail.ch>
2020-05-01 11:17:38 +02:00
Tobias Pflug 533343628d Revamp README.md 2020-04-30 22:03:34 +02:00
Domen Kožar 625868b33d
Update issue templates 2020-04-30 15:01:23 +02:00
Domen Kožar a15f918cba Update issue templates 2020-04-30 14:57:40 +02:00
Eelco Dolstra 0135fd6ec4
nix dev-shell: Unset shellHook
This avoids inheriting the caller's shellHook, which can happen when
running a dev-shell inside a dev-shell.
2020-04-30 14:47:56 +02:00
Eelco Dolstra efe6c186ea
nix dev-shell: Support structured attrs
Tested against https://github.com/NixOS/nixpkgs/pull/72074.

Fixes #3540.
2020-04-30 14:47:47 +02:00
Eelco Dolstra 2fcfc6c2c6
nix dev-shell: Refactor script for getting the environment 2020-04-30 13:05:29 +02:00
Domen Kožar df8e9d691c
Merge pull request #3548 from Ma27/fetchtarball-pos
Fix displaying error-position in `builtins.fetch{Tree,Tarball}`
2020-04-30 10:33:12 +02:00
Maximilian Bosch d1229859c2
Fix displaying error-position in builtins.fetch{Tree,Tarball}
Without dereferencing this pointer, you'd get an error like this:

```
error: unsupported argument 'abc' to 'fetchTarball', at 0x13627e8
```
2020-04-29 22:53:39 +02:00
Guillaume Bouchard 2e5be2a749 StringSink pre allocate
When used with `readFile`, we have a pretty good heuristic of the file
size, so `reserve` this in the `string`. This will save some allocation
/ copy when the string is growing.
2020-04-29 18:44:01 +02:00
Guillaume Bouchard 7afcb5af98 Remove the drain argument from readFile
Now it is always `drain` (see previous commit).
2020-04-29 18:43:45 +02:00
Eelco Dolstra aeb406dd1b
Merge pull request #3547 from nlewo/grantpt
Only call grantpt on MacOS systems
2020-04-29 16:04:35 +02:00
Antoine Eiche ca93b26db6 Only call grantpt on MacOS systems
The commit 3cc1125595 adds a `grantpt`
call on the builder pseudo terminal fd. This call is actually only
required for MacOS, but it however requires a RW access to /dev/pts
which is only RO bindmounted in the Bazel Linux sandbox. So, Nix can
not be actually run in the Bazel Linux sandbox for unneeded reasons.
2020-04-29 15:43:20 +02:00
Guillaume Bouchard 5a34a473dd builtins.readFile: do not truncate content
This closes #3026 by allowing `builtins.readFile` to read a file with a
wrongly reported file size, for example, files in `/proc` may report a
file size of 0. Reading file in `/proc` is not a good enough motivation,
however I do think it just makes nix more robust by allowing more file
to be read.  Especially, I do considerer the previous behavior to be
dangerous because nix was previously reading truncated files. Examples
of file system which incorrectly report file size may be network file
system or dynamic file system (for performance reason, a dynamic file
system such as FUSE may generate the content of the file on demand).

```
nix-repl> builtins.readFile "/proc/version"
""
```

With this commit:

```
nix-repl> builtins.readFile "/proc/version"
"Linux version 5.6.7 (nixbld@localhost) (gcc version 9.3.0 (GCC)) #1-NixOS SMP Thu Apr 23 08:38:27 UTC 2020\n"
```

Here is a summary of the behavior changes:

- If the reported size is smaller, previous implementation
was silently returning a truncated file content. The new implementation
is returning the correct file content.

- If a file had a bigger reported file size, previous implementation was
failing with an exception, but the new implementation is returning the
correct file content. This change of behavior is coherent with this pull
request.

Open questions

- The behavior is unchanged for correctly reported file size, however
performances may vary because it uses the more complex sink interface.
Considering that sink is used a lot, I don't think this impacts the
performance a lot.
- `builtins.readFile` on an infinite file, such as `/dev/random` may
fill the memory.
- it does not support adding file to store, such as `${/proc/version}`.
2020-04-29 14:50:52 +02:00
Eelco Dolstra 06849c3090
Merge pull request #3542 from mkenigs/gcroots
Set GCROOT to store path to prevent garbage collection
2020-04-28 21:04:06 +02:00
Matthew Kenigsberg 6d40fe573c rename to NIX_GCROOT 2020-04-28 11:18:54 -06:00
Eelco Dolstra 52a3ca823d Tweak warning message 2020-04-28 17:56:01 +02:00
Eelco Dolstra 6a8cba83bb Merge branch 'nix-env-warn-unmatched' of https://github.com/lheckemann/nix 2020-04-28 17:45:25 +02:00
Eelco Dolstra ee754f0f41
Merge pull request #3541 from alyssais/gcdos
Fix long paths permanently breaking GC
2020-04-28 16:33:45 +02:00
Alyssa Ross c05e20daa1
Fix long paths permanently breaking GC
Suppose I have a path /nix/store/[hash]-[name]/a/a/a/a/a/[...]/a,
long enough that everything after "/nix/store/" is longer than 4096
(MAX_PATH) bytes.

Nix will happily allow such a path to be inserted into the store,
because it doesn't look at all the nested structure.  It just cares
about the /nix/store/[hash]-[name] part.  But, when the path is deleted,
we encounter a problem.  Nix will move the path to /nix/store/trash, but
then when it's trying to recursively delete the trash directory, it will
at some point try to unlink
/nix/store/trash/[hash]-[name]/a/a/a/a/a/[...]/a.  This will fail,
because the path is too long.  After this has failed, any store deletion
operation will never work again, because Nix needs to delete the trash
directory before recreating it to move new things to it.  (I assume this
is because otherwise a path being deleted could already exist in the
trash, and then moving it would fail.)

This means that if I can trick somebody into just fetching a tarball
containing a path of the right length, they won't be able to delete
store paths or garbage collect ever again, until the offending path is
manually removed from /nix/store/trash.  (And even fixing this manually
is quite difficult if you don't understand the issue, because the
absolute path that Nix says it failed to remove is also too long for
rm(1).)

This patch fixes the issue by making Nix's recursive delete operation
use unlinkat(2).  This function takes a relative path and a directory
file descriptor.  We ensure that the relative path is always just the
name of the directory entry, and therefore its length will never exceed
255 bytes.  This means that it will never even come close to AX_PATH,
and Nix will therefore be able to handle removing arbitrarily deep
directory hierachies.

Since the directory file descriptor is used for recursion after being
used in readDirectory, I made a variant of readDirectory that takes an
already open directory stream, to avoid the directory being opened
multiple times.  As we have seen from this issue, the less we have to
interact with paths, the better, and so it's good to reuse file
descriptors where possible.

I left _deletePath as succeeding even if the parent directory doesn't
exist, even though that feels wrong to me, because without that early
return, the linux-sandbox test failed.

Reported-by: Alyssa Ross <hi@alyssa.is>
Thanks-to: Puck Meerburg <puck@puckipedia.com>
Tested-by: Puck Meerburg <puck@puckipedia.com>
Reviewed-by: Puck Meerburg <puck@puckipedia.com>
2020-04-27 20:50:17 +00:00
Matthew Kenigsberg 9e95b95a5d comment 2020-04-27 13:18:26 -06:00
Matthew Kenigsberg a3bc695e7d Set GCROOT to store path to prevent garbage collection 2020-04-27 11:22:20 -06:00
Linus Heckemann f59404e1a6 nix-env: refactor uninstallDerivations
Reduces the number of store queries it performs. Also prints a warning
if any of the selectors did not match any installed derivations.

UX Caveats:
- Will print a warning that nothing matched if a previous selector
  already removed the path
- Will not do anything if no selectors were provided (no change from
  before).

Fixes #3531
2020-04-25 16:30:42 +02:00
Eelco Dolstra c9d0cf7e02
Don't include error.hh in util.hh to prevent header bloat 2020-04-22 15:29:27 +02:00
Eelco Dolstra 7114f088fc
Don't install error-demo 2020-04-22 15:29:22 +02:00
Eelco Dolstra 16e3bf4537
Merge branch 'error-format' of https://github.com/bburdette/nix 2020-04-22 15:29:10 +02:00
Eelco Dolstra 2ea4d45449
Path fetcher: Fix store path name
(cherry picked from commit c7af247bea)
2020-04-22 15:27:06 +02:00
Eelco Dolstra 4a2a45f53d
Merge pull request #3522 from HackerFoo/replace-select-with-poll
Replace select() with poll()
2020-04-22 12:25:41 +02:00
Dustin DeWeese c0d940978a Replace select() with poll() to allow waiting on more than FD_SETSIZE fds 2020-04-21 16:21:28 -07:00
Domen Kožar 25ed842725
Merge pull request #3502 from NixOS/more-pos
pass Pos to forceValue to improve infinite recursion error
2020-04-18 14:05:21 +02:00
Ben Burdette 12814806ef iomanip no longer needed 2020-04-16 10:48:15 -06:00
Eelco Dolstra efaffaa9d1 Use Logger::stdout()
(cherry picked from commit 8f41847394)
2020-04-16 18:14:01 +02:00
Eelco Dolstra 67a5941472 Logger: Add method for writing to stdout
Usually this just writes to stdout, but for ProgressBar, we need to
clear the current line, write the line to stdout, and then redraw the
progress bar.

(cherry picked from commit 696c026006)
2020-04-16 18:03:38 +02:00
Eelco Dolstra fcd048a526 Use RootValue 2020-04-16 18:02:59 +02:00
Ben Burdette 96262e744e switch to structs, which don't need public: 2020-04-16 09:55:38 -06:00
Eelco Dolstra 9f46f54de4 JSONSax: Use a RootValue
More #3377.
2020-04-16 17:30:18 +02:00
Eelco Dolstra 10e17eaa58 ValueMap, VectorVector: Use traceable_allocator
We want to *trace* the 'Value *' arrays, not garbage-collect them!
Otherwise the vectors/maps can end up pointing to nowhere.

Fixes #3377. Closes #3384.
2020-04-16 17:30:13 +02:00
Eelco Dolstra b3e5eea4a9 Add function to allocate a Value in traceable memory 2020-04-16 17:30:05 +02:00
Eelco Dolstra 1290411c2d fetchMercurial: Use inputFromAttrs() 2020-04-16 17:29:30 +02:00
Domen Kožar b865b5b40c
pass Pos to forceValue to improve infinite recursion error 2020-04-16 12:32:07 +02:00
Ben Burdette 057e5b6b2e move implementation to cc 2020-04-15 10:09:43 -06:00
Ben Burdette adf03b0b8e Merge branch 'initializer-style' into error-format 2020-04-15 10:06:20 -06:00
Eelco Dolstra 2f9789c2e6
Merge pull request #3492 from andir/nix-build-gc-free
SourceExprCommand: allocate the vSourceExpr via uncollectable memory
2020-04-15 13:01:04 +02:00
Eelco Dolstra a118293bd0
Merge pull request #3458 from zimbatm/nix-user-conf-dir
NIX_USER_CONF_FILES
2020-04-15 13:00:28 +02:00
Jonas Chevalier 895516cadf
add NIX_USER_CONF_FILES
Motivation: maintain project-level configuration files.

Document the whole situation a bit better so that it corresponds to the
implementation, and add NIX_USER_CONF_FILES that allows overriding
which user files Nix will load during startup.
2020-04-14 18:45:06 +02:00
Andreas Rammhold d2c371927e SourceExprCommand: allocate the vSourceExpr via uncollectable memory
Previously the memory would occasionally be collected during eval since
the GC doesn't consider the member variable as alive / doesn't scan the
region of memory where the pointer lives.

By using the traceable_allocator<T> allocator provided by Boehm GC we
can ensure the memory isn't collected. It should be properly freed when
SourceExprCommand goes out of scope.
2020-04-13 21:23:54 +02:00