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libutil: Fix restoring mount namespace
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libfetchers: Fix assertion
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Rename `nixosModule` to `nixosModules.default` consistent with other outputs
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The filter expects all paths to have a prefix of the raw `actualUrl`, but
`Store::addToStore(...)` provides absolute canonicalized paths.
To fix this create an absolute and canonicalized path from the `actualUrl` and
use it instead.
Fixes #6195.
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Installer: Use curl --fail so we don't silently ignore download errors
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Fix empty 'nix copy' error message
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This was caused by SubstitutionGoal not setting the errorMsg field in
its BuildResult. We now get a more descriptive message than in 2.7.0, e.g.
error: path '/nix/store/13mh...' is required, but there is no substituter that can build it
instead of the misleading (since there was no build)
error: build of '/nix/store/13mh...' failed
Fixes #6295.
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fetchClosure: Don't allow URL query parameters
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Allowing this is a potential security hole, since it allows the user
to specify parameters like 'local-nar-cache'.
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libutil: Reserve memory when en/decoding base64
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tokenizeString: Fix semantic mistake
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`string_view::find_first_not_of(...)` and
`string_view::find_first_of(...)` return `string_view::npos` on error
not `string::npos`.
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The size of the output when encoding to and decoding from base64 is
(roughly) known so we can allocate it in advance to prevent
reallocation.
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doctor: Always show the output
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Add anchors to the nix.conf options in the manual
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Update to latest Nixpkgs 21.05
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Flake lock file updates:
• Updated input 'nixpkgs':
'github:NixOS/nixpkgs/82891b5e2c2359d7e58d08849e4c89511ab94234' (2021-09-28)
→ 'github:NixOS/nixpkgs/530a53dcbc9437363471167a5e4762c5fcfa34a1' (2022-02-19)
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Fix https://github.com/NixOS/nix/issues/6342
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For each `nix.conf` option, add an empty html node with a unique `id`
that can be used as an anchor target. Also make the name of the option
be a link to that target so that it’s easily discoverable.
We can’t rewrite the whole list as an html definition list like it’s
done for the builtins because these options also appear in a man page,
and the manpage renderer (lowdown) can’t render arbitrary html. But the
hack here allows to keep the manpage and have the links in the html
version.
Fix https://github.com/NixOS/nix/issues/5745
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Allow `welcomeText` when checking a flake template
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Fix https://github.com/NixOS/nix/issues/6321
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Saving the cwd fd didn't actually work well -- prior to this commit, the
following would happen:
: ~/w/vc/nix ; doas outputs/out/bin/nix --experimental-features 'nix-command flakes' run nixpkgs#coreutils -- --coreutils-prog=pwd
pwd: couldn't find directory entry in ‘../../../..’ with matching i-node
: ~/w/vc/nix ; doas outputs/out/bin/nix --experimental-features 'nix-command flakes' develop -c pwd
pwd: couldn't find directory entry in ‘../../../..’ with matching i-node
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This doesn't work very well (maybe I'm misunderstanding the desired
implementation):
: ~/w/vc/nix ; doas outputs/out/bin/nix --experimental-features 'nix-command flakes' develop -c pwd
pwd: couldn't find directory entry in ‘../../../..’ with matching i-node
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Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
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fix(run): set applyNixConfig lockFlag
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It's a GNU extension, as pointed out by pennae.
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Just in case making libutil depend on std::filesystem is unacceptable,
here is the non-filesystem approach.
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I regularly pass around simple scripts by using nix-shell as the script
interpreter, eg. like this:
#!/usr/bin/env nix-shell
#!nix-shell -p dd_rescue coreutils bash -i bash
While this works most of the time, I recently had one occasion where it
would not and the above would result in the following:
$ sudo ./myscript.sh
bash: ./myscript.sh: No such file or directory
Note the "sudo" here, because this error only occurs if we're root.
The reason for the latter is because running Nix as root means that we
can directly access the store, which makes sure we use a filesystem
namespace to make the store writable. XXX - REWORD!
So when stracing the process, I stumbled on the following sequence:
openat(AT_FDCWD, "/proc/self/ns/mnt", O_RDONLY) = 3
unshare(CLONE_NEWNS) = 0
... later ...
getcwd("/the/real/cwd", 4096) = 14
setns(3, CLONE_NEWNS) = 0
getcwd("/", 4096) = 2
In the whole strace output there are no calls to chdir() whatsoever, so
I decided to look into the kernel source to see what else could change
directories and found this[1]:
/* Update the pwd and root */
set_fs_pwd(fs, &root);
set_fs_root(fs, &root);
The set_fs_pwd() call is roughly equivalent to a chdir() syscall and
this is called when the setns() syscall is invoked[2].
[1]: https://github.com/torvalds/linux/blob/b14ffae378aa1db993e62b01392e70d1e585fb23/fs/namespace.c#L4659
[2]: https://github.com/torvalds/linux/blob/b14ffae378aa1db993e62b01392e70d1e585fb23/kernel/nsproxy.c#L346
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