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Alexander Egorenkov 1854aeec4d build: fix opkg install step for large package selection 
When the list of packages to be installed in a built image exceeds a certain
number, then 'opkg install' executed for target '$(curdir)/install' in
package/Makefile fails with: /usr/bin/env: Argument list too long.

On Linux, the length of a command-line parameter is limited by
MAX_ARG_STRLEN to max 128 kB.

* https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/binfmts.h#L15
* https://www.in-ulm.de/~mascheck/various/argmax/

To solve the problem, store the package list being passed to 'opkg install'
in a temporary file and use the shell command substitution to pass the
content of the file to 'opkg install'. This guarantees that the length of
the command-line parameters passed to the bash shell is short.

The following bash script demonstrates the problem:
----------------------------------------------------------------------------
count=${1:-1000}

FILES=""
a_file="/home/egorenar/Repositories/openwrt-rel/bin/targets/alpine/generic/packages/base-files_1414-r16464+19-e887049fbb_arm_cortex-a15_neon-vfpv4.ipk"

for i in $(seq 1 $count); do
	FILES="$FILES $a_file"
done

env bash -c "echo $FILES >/dev/null"
echo "$FILES" | wc -c
----------------------------------------------------------------------------

Test run:
----------------------------------------------------------------------------
$ ./test.sh 916
130989
$ ./test.sh 917
./test.sh: line 14: /bin/env: Argument list too long
131132
----------------------------------------------------------------------------

Signed-off-by: Alexander Egorenkov <egorenar-dev@posteo.net>
[reword commit subject]
Signed-off-by: Paul Spooren <mail@aparcar.org>
 		2021-05-12 11:13:53 +02:00
.github build: Update README & github help 2018-07-08 09:41:53 +01:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
config treewide: fix spelling 'seperate' -> 'separate' 2021-02-28 23:59:21 +00:00
include kernel: bump 5.10 to 5.10.35 2021-05-09 09:55:58 +01:00
package build: fix opkg install step for large package selection 2021-05-12 11:13:53 +02:00
scripts build,json: 3rd fixup of default_packages 2021-03-25 10:25:54 -10:00
target generic: platform/mikrotik: release mtd device after use 2021-05-12 10:13:12 +02:00
toolchain glibc: update to latest 2.33 HEAD (bug 27744) 2021-05-01 21:16:11 +02:00
tools firmware-utils: zytrx: Add util for ZyXEL specific header 2021-05-09 09:15:44 +02:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore gitignore: add .vscode for VS Code users 2021-03-08 10:46:06 +01:00
BSDmakefile build: use SPDX license tags 2021-02-05 14:54:47 +01:00
COPYING COPYING: add COPYING file to specify project licenses 2021-02-14 19:21:38 +01:00
Config.in build: use SPDX license tags 2021-02-05 14:54:47 +01:00
Makefile Revert "build: replace which with Bash command built-in" 2021-03-03 22:51:39 +01:00
README.md README: add install command to build requirements 2021-03-26 19:57:20 +01:00
feeds.conf.default feeds: management: remove dead and out of project feed 2021-05-01 00:37:15 +02:00
rules.mk build: make sure asm gets built with -DPIC 2021-03-24 23:47:34 +00:00

README.md

OpenWrt logo

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!

Development

To build your own firmware you need a GNU/Linux, BSD or MacOSX 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 python3.6+ rsync subversion unzip which

Quickstart

  1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

  2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

  3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

  4. Run make to 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.

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 #openwrt on freenode.net.

Developer Community

License

OpenWrt is licensed under GPL-2.0