1310e4f1ae
When running a failsafe shell on a console, job control was unavailable, and ^C did not function correctly. This change invokes console failsafe shells via `setsid`, making them session leaders and allowing them to claim controlling terminals, which makes job control function properly. To support this, the busybox `setsid` utility is enabled. This has a minimal 149-byte size impact on a test x86_64 squashfs rootfs image. ^C was ignored in subprocesses of failsafe shells: it was not possible to ^C out of a program that would not exit on its own, such as many typical `ping` invocations. As job control was unavailable, it was not possible to suspend these subprocesses either, causing a hung program to tie up a console indefinitely, unless another means to signal the program was available. This was caused by SIGINT being placed at disposition SIG_IGN by the shell running preinit, which it did because the console shell was executed asynchronously with &. That disposition was inherited by the console shell and its subprocesses, generally causing ^C to have no effect. As there is no way in busybox `ash` to reset the disposition of a signal already ignored at shell entry, and no apparent way to avoid SIGINT being placed at SIG_IGN when & is used in preinit, an alternative construct is needed. Now, `start-stop-daemon` is used to start (-S) the console failsafe shell in the background (-b). This approach does not alter SIGINT, allowing the console shell to be started with that signal's handling intact, and normal ^C processing to occur. busybox `ash` has some behaviors conditional on SHLVL, and while the console shells ought to run at SHLVL=1, they were not by virtue of being started by the shell-based preinit system. Additionally, a variety of detritus was present in the console shell's environment, carried over from preinit. These conditions are corrected by running the console shell via `env -i` to clear the environment and establish a minimum and correct set of environment variables for operation, in the same manner as `login`. HOME is not explicitly set, because it's addressed in /etc/profile. For non-failsafe console shells when system.@system[0].ttylogin = 0, `login -f root` achieves a similar effect. (`login` already started non-failsafe console shells when ttylogin = 1 and behaved correctly. This brings the ttylogin = 0 case to parity.) Note that even `login -f` is somewhat undesirable for failsafe shells because it requires a viable /etc/passwd, hence the `env -i` construct in that case. The TERM environment variable from the preinit environment, with value "linux", would rarely be correct for serial consoles. Now, the preinit TERM value is preserved (or set to "linux" if unset) only when the console is /dev/console or /dev/tty[0-9]*. Otherwise, it will be set to a safe default appropriate for serial consoles, "vt102", as used for serial consoles by busybox init. This "linux"/"vt102" TERM setting is also duplicated for non-failsafe console shells. This also indicates failsafe mode by showing "- failsafe -" on all consoles (not just the last-defined one). It sets a hostname of "OpenWrt-failsafe" in failsafe mode which is rendered in the shell's prompt as a reminder of the mode during interactive failsafe use. Previously, no hostname was set, which resulted in the kernel-default hostname, "(none)", appearing in failsafe shell prompts. Signed-off-by: Mark Mentovai <mark@mentovai.com> Link: https://github.com/openwrt/openwrt/pull/16113 Signed-off-by: Robert Marko <robimarko@gmail.com> |
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| toolchain | ||
| tools | ||
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| README.md | ||
| rules.mk | ||
OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.
Sunshine!
Download
Built firmware images are available for many architectures and come with a package selection to be used as WiFi home router. To quickly find a factory image usable to migrate from a vendor stock firmware to OpenWrt, try the Firmware Selector.
If your device is supported, please follow the Info link to see install instructions or consult the support resources listed below.
An advanced user may require additional or specific package. (Toolchain, SDK, ...) For everything else than simple firmware download, try the wiki download page:
Development
To build your own firmware you need a GNU/Linux, BSD or macOS system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.
Requirements
You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.
binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.7+ rsync subversion unzip which
Quickstart
-
Run
./scripts/feeds update -ato obtain all the latest package definitions defined in feeds.conf / feeds.conf.default -
Run
./scripts/feeds install -ato install symlinks for all obtained packages into package/feeds/ -
Run
make menuconfigto select your preferred configuration for the toolchain, target system & firmware packages. -
Run
maketo build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.
Related Repositories
The main repository uses multiple sub-repositories to manage packages of
different categories. All packages are installed via the OpenWrt package
manager called opkg. If you're looking to develop the web interface or port
packages to OpenWrt, please find the fitting repository below.
-
LuCI Web Interface: Modern and modular interface to control the device via a web browser.
-
OpenWrt Packages: Community repository of ported packages.
-
OpenWrt Routing: Packages specifically focused on (mesh) routing.
-
OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).
Support Information
For a list of supported devices see the OpenWrt Hardware Database
Documentation
Support Community
- Forum: For usage, projects, discussions and hardware advise.
- Support Chat: Channel
#openwrton oftc.net.
Developer Community
- Bug Reports: Report bugs in OpenWrt
- Dev Mailing List: Send patches
- Dev Chat: Channel
#openwrt-develon oftc.net.
License
OpenWrt is licensed under GPL-2.0