Commit graph

24 commits

Author SHA1 Message Date
Greg Price
7313aa267b installer: Fix terminal colors.
The install-multi-user script uses blue, green, and red colors, as
well as bold and underline, to add helpful formatting that helps
structure its rather voluminous output.

Unfortunately, the terminal escape sequences it uses are not quite
well-formed.  The relevant information is all there, just obscured
by some extra noise, a leading parameter `38`.  Empirically, the
result is:

 * On macOS, in both Terminal.app and iTerm2, the spurious `38` is
   ignored, the rest of the escape sequence is applied, and the colors
   show up as intended.

 * On Linux, in at least gnome-terminal and xterm, the spurious `38`
   and the next parameter after it are ignored, and what's left is
   applied.  So in the sequence `38;4;32`, the 4 (underline) is
   ignored but the 32 (green) takes effect; in a more typical sequence
   like `38;34`, the 34 (blue) is ignored and nothing happens.

These codes are all unchanged since this script's origins as a
Darwin-only script -- so the fact that they work fine in common macOS
terminals goes some way to explain how the bug arose.

Happily, we can make the colors work as intended by just deleting the
extra `38;`.  Tested in all four terminals mentioned above; the new
codes work correctly on all of them, and on the two macOS terminals
they work exactly the same as before.

---

In a bit more technical detail -- perhaps more than anyone, me
included, ever wanted to know, but now that I've gone and learned it
I'll write it down anyway :) -- here's what's happening in these codes:

An ECMA-48 "control sequence" begins with `\033[` aka "CSI", contains
any number of parameters as semicolon-separated decimal numbers (plus
sometimes other wrinkles), and ends with a byte from 0x40..0x7e.  In
our case, with `m` aka "SGR", "Select Graphic Rendition".

An SGR control sequence `\033[...m` sets colors, fonts, text styles,
etc.  In particular a parameter `31` means red, `32` green, `34` blue,
`4` underline, and `0` means reset to normal.  Those are all we use.

There is also a `38`.  This is used for setting colors too... but it
needs arguments.  `38;5;nn` is color nn from a 256-color palette, and
`38;2;rr;gg;bb` has the given RGB values.

There is no meaning defined for `38;1` or `38;34` etc.  On seeing a
parameter `38` followed by an unrecognized argument for it, apparently
some implementations (as seen on macOS) discard only the `38` and
others (as seen on Linux) discard the argument too before resuming.
2020-03-24 21:15:01 -07:00
Greg Price
26851dd2c2 installer: Set files read-only when copying into store
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.
2020-03-22 23:07:20 -07:00
Eelco Dolstra
2f96a89646 install-multi-user.sh: Remove unused variables
https://hydra.nixos.org/build/104119659
2019-10-23 21:24:21 +02:00
Eelco Dolstra
9277e72cb0
Typo 2019-10-09 23:35:02 +02:00
Eelco Dolstra
c43d9f6131
Remove some redundant initialization 2019-10-09 23:35:01 +02:00
Eelco Dolstra
5a303093dc
Remove world-writability from per-user directories
'nix-daemon' now creates subdirectories for users when they first
connect.

Fixes #509 (CVE-2019-17365).
Should also fix #3127.
2019-10-09 23:34:48 +02:00
Matthew Bauer
d4e51aac08 Make preexisting Nix install a warning, not a failure
In the multi-user install script, we originally made sure no previous
references to Nix existed. This prevented any previous installs from
contaminating the new install. However, some users need the ability to
repair their existing Nix installation without uninstalling all
references to Nix. This change allows users with existing Nix
installations to use the installer, while still outputing a warning
message on the dangers of this. As a result, the multi-user install
script work much more like the single-user install script has worked
in the past.

This is a requirement for macOS Catalina users now that
/Library/LaunchDaemons/org.nixos.nix-daemon.plisg is not managed by
the Nix store. If there is ever a change to the .plist, all users will
need to rerun this install script to get the new changes. Otherwise,
changes to the launch daemon will require manual interventions.
2019-10-08 21:53:06 -04:00
Eelco Dolstra
ad03159e25
Merge pull request #2745 from samueldr/install/detect-systemd-separately
install-multi-user: Detect and fail lack of systemd separately
2019-08-28 11:34:23 +02:00
Matthew Bauer
0463d5e36f Allow empty /nix directory in multi-user installer
With macOS catalina, we can no longer modify the root system
volume (#2925). macOS provides a system configuration file in
synthetic.conf(5) to create empty root directories. This can be used
to mount /nix to a separate volume. As a result, this directory will
need to already exist prior to installation. Instead, check for
/nix/store and /nix/var for a live Nix installation.
2019-08-22 23:38:52 -04:00
Eelco Dolstra
38a4d38bc3
Merge pull request #2746 from bjornfor/install-multi-user-defaults
install-multi-user: reduce max-jobs from 32 to 1
2019-06-17 10:17:40 +02:00
Eelco Dolstra
989cb37777
Merge pull request #2679 from bjornfor/offline-install
install script: don't abort when "nix-channel --update" fails
2019-05-01 15:48:39 +02:00
Bjørn Forsman
07d9981f34 install-multi-user: remove unneeded settings from nix.conf
Hardcoding the "max-jobs" and "cores" settings in nix.conf at install
time, to the same value as Nix' built-in default, makes little sense to
me.
2019-03-27 16:26:14 +01:00
Bjørn Forsman
dbe4c043d7 install-multi-user: reduce max-jobs from 32 to 1
Having max-jobs = 32 ($NIX_USER_COUNT is hardcoded to that value) may
severely overload the machine. The nix.conf(5) manual page says max-jobs
defaults to 1, so let's use that value.

NOTE: Both max-jobs and cores are now being set to their default value,
so they can be removed alltogether.
2019-03-27 16:23:35 +01:00
Samuel Dionne-Riel
d854e7dfd6 install-multi-user: Detect and fail lack of systemd separately
Otherwise, the user is shown:

```
Sorry, I don't know what to do on Linux
```

Which is... not exactly right.
2019-03-26 21:08:22 -04:00
Domen Kožar
6f0359012c
Merge pull request #2693 from thoughtpolice/scripts/multi-user-sandbox
scripts: remove default 'sandbox = false' from multi-user installer
2019-03-24 19:45:56 +07:00
Austin Seipp
d7a7a029ff
scripts: remove default 'sandbox = false' from multi-user installer
Sandboxing is now enabled by default on Linux, but is still disabled on
macOS. However, the installer always turned it off to ensure consistent
behavior.

Remove this default configuration, so we fall back to the default
platform-specific value.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
2019-02-23 08:35:26 -06:00
zimbatm
b402148d8f
remove noop uses of nix-store --init
the nix-store --init command is a noop apparently
2019-02-22 21:07:53 +01:00
Bjørn Forsman
b9567aa8b6 install script: don't abort when "nix-channel --update" fails
Instead, print a message about what happened and tell the user what can
be done (run "[sudo -i] nix-channel --update nixpkgs" again at a later
time). This change allows installing Nix when you're offline.

Since the multi-user installer is so verbose, the message isn't printed
until the end.

Fixes issue #2650 ("installation without internet connection").
2019-02-20 09:35:01 +01:00
Graham Christensen
6ba1726eeb
install-multi-user: support 'set -u' runs, closes #2193 2018-05-30 09:35:21 -04:00
Graham Christensen
c4b9486f9b
install-multi-user: don't force NIX_SSL_CERT_FILE
Following the lead of the single user installer, if NIX_SSL_CERT_FILE is explicitly set prior to running, accept the user-provided version.
2018-05-25 15:54:55 -04:00
Graham Christensen
4eb40c72ed
macos: Handle when a build user doesn't have a user ID 2018-03-30 13:57:00 -04:00
Graham Christensen
f06f8102bd
Use a looser comparison for the 'user note' check
We use grep instead of an equality check because it is difficult
to extract _just_ the user's note, instead it is prefixed with
some plist junk. This was causing the user note to always be set,
even if there was no reason for it.
2018-03-30 11:38:08 -04:00
Graham Christensen
4ba91f5bae
Check for the existence of a profile target before seeing if it mentions Nix
Grep would ignore files that didn't exist, but would complain
about files in a directory if the directory didn't exist. Simply check
for the directory first, prior to grepping it.
2018-03-30 11:37:32 -04:00
Graham Christensen
2921165a9d
Expand the multi-user installer to support Linuxes with systemd
- darwin installer: delete hardware report, not necessary
 - moves os-specific code from the darwin installer to to `poly_*`
   functions
 - adds profile.d support to the profile targets, which automatically
   handles many distros which don't have a /etc/bashrc but do have an
   /etc/profile.d
 - /bin/bash -> /usr/bin/env bash
 - document why each excluded shellcheck check is excluded
 - rename the multi-user to Daemon-based
2018-03-29 15:38:01 -04:00