After installing Nix, I found that all the files and directories
initially copied into the store were writable, with mode 644 or 755:
drwxr-xr-x 9 root root 4096 Dec 31 1969 /nix/store/ddmmzn4ggz1f66lwxjy64n89864yj9w9-nix-2.3.3
The reason is that that's how they were in the unpacked tarball, and
the install-multi-user script used `rsync -p` without doing anything
else to affect the permissions.
The plain `install` script for a single-user install takes care to
do a `chmod -R a-w` on each store path copied. We could do the same
here with one more command; or we can pass `--chmod` to rsync, to
have it write the files with the desired modes in the first place.
Tested the new `rsync` command on both a Linux machine with a
reasonably-modern rsync (3.1.3) and a Mac with its default, ancient,
rsync 2.6.9, and it works as expected on both. Thankfully the latter
is just new enough to have `--chmod`, which dates to rsync 2.6.7.
Sadly 10.15 changed /bin/sh to a shim which executes bash, this means it
can't be used anymore without also opening up the sandbox to allow bash.
Failed to exec /bin/bash as variant for /bin/sh (1: Operation not permitted).
This is used to determine the dependency tree of impure libraries so nix
knows what paths to open in the sandbox. With the less restrictive
defaults it isn't needed anymore.
Running `nix-store --gc --delete` will, as of Nix 2.3.3, simply fail
because the --delete option conflicts with the --delete operation.
$ nix-store --gc --delete
error: only one operation may be specified
Try 'nix-store --help' for more information.
Furthermore, it has been broken since at least Nix 0.16 (which was
released sometime in 2010), which means that any scripts which depend
on it should have been broken at least nine years ago. This commit
simply formally removes the option. There should be no actual difference
in behaviour as far as the user is concerned: it errors with the exact
same error message. The manual has been edited to remove any references
to the (now gone) --delete option.
Other information:
* Path for Nix 0.16 used:
/nix/store/rp3sgmskn0p0pj1ia2qwd5al6f6pinz4-nix-0.16
Unless the 'tested' job in the Nixpkgs/NixOS jobsets, this job isn't
actually used for anything (e.g. we don't update a channel based on
whether 'release' succeeds).
Source tarballs are not very useful anymore. People who want to build
from source can also just build from the Git repository. Once upon a
time, the source tarball also saved users from needing a few
dependencies (e.g. bison and flex) but those are dwarfed by the other
dependencies, so it's no longer worth it.
Note: the release script should be updated to copy the vendoredCrates
tarball.
This file is licensed under the GPL. Originally, Nix was also
GPL-licensed so that was fine. However, we later changed the license
to the LGPL but missed the fact that style.css has an incompatible
license.
Since the Nix manual at nixos.org uses its own styling, we can remove
this file.
Fixes#3392.
In
nix-instantiate --dry-run '<nixpkgs/nixos/release-combined.nix>' -A nixos.tests.simple.x86_64-linux
this reduces time spent in unparse() from 9.15% to 4.31%. The main
culprit was appending characters one at a time to the destination
string. Even though the string has enough capacity, push_back() still
needs to check this on every call.
The problem fixed: each nix-shell invocation creates a new temporary
directory (`/tmp/nix-shell-*`) and never cleans up.
And while I'm here, shellescape all variables inlined into the rcfile.
See what might happen without escaping:
$ export TZ="';echo pwned'"
$ nix-shell -p hello --run hello
pwned
Hello, world!
