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Proof of concept remote builder of clean Gentoo tree to provide on demand binary packages to desktop and
laptop comptuers.
- This will not work with presence of any significant unstable packet.
* For instance, unstable firefox depends on unstable "nss-3.45". After update it is replaced in portage
with "nss-3.46". Either full "nss-3.*" branch should be unmasked (which may bring its own problems or the
manual intervention is required)
- Even with stable tree, there are pereodically circular dependencies (always during the bootstrap phase)
Idea:
- Create 'Bootstrap' image, i.e. Gentoo image with all configuration. Solved circular dependencies ready to build
make bootstrap
make check
- Instantiate 'Builder', i.e. synced configs and portage tree
make builder
make bash
- Update builder to integrate latest configuration/portage changes
make update
make bash
- Start building
make build
make logs
It will build packages and put it on the attached volume. The script is designed to run forever.
* If crashed it will start idle sleep until the connected user solves the problem and kills the
sleep. It will restart building, then.
* If it finishes, it will re-sync after given interval or just wait until the user triggers rebuild
manually, again by killing sleep.
If the script is restarted for some reason (crash/server reboot), emerge will first re-use already
built binaries and, then, will continue compilling.
* At some point a snapshot could be made by converting 'container' into the huge 'image' with
'docker commit'.
Problems:
- This requires large and fast storage. I guess overlayfs2 based stuff is helpful.
- It also requires a novel kernel on the docker machine. For instance, QT would not
compile on the old kernel. The library now may incorporate information about the minimum
kernel version which is required to run it, e.g.
readelf -n /usr/lib64/libQt5Core.so|grep Linux
OS: Linux, ABI: 3.17.0
However, such elf-header is (at the moment) also preventing it from linking. So, you not
only unable to run a novel QT with old kenrel, but also compile it.
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