[FS#3849] opkg: Feature request: Add possibility to read packages from a file instead from the command line.

[OpenWrt Bugs]

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User who did this - Drei Eck (dreieck) 

Attached to Project - OpenWrt/LEDE Project
Summary - opkg: Feature request: Add possibility to read packages from a file instead from the command line.
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I suggest to enhance `opkg` so that with a command line option it can read the list of packages to operate on (e.g. install, remove) from a file or from standard input rather than from the command line.

This would enable the build system to be re-written so that the build of images with a lot amount of packages compiled in succeeds. Now it bails out with `/usr/bin/env: Argument list too long`, since at one point all the packages are to be installed at once (and this cannot be split up to enable proper dependency handling), which will inevitably fail for a lot of packages (even with high stack size set with `ulimit`) due to a too long command line.

There are several reports of this in the forum; I refer to [[https://forum.openwrt.org/t/96942|this thread "`/usr/bin/env: Argument list too long`-error persisting – OpenWRT 21.02.0-rc1 package installation creates a huge command line although far far from most packages selected"]], where a case is reported of a 210800 characters long command and ideas to change the build system.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3849

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