Posts tagged portage


Portage

:: gentoo, portage

By: Maciej Barć

Switching from a git repository hosting

For nearly 2 years I have been synchronizing settings between my Gentoo machines via a git repository that is installed system-wide via portage itself.

This actually gets a little tiresome and slow as the package that installs the configuration has to be re-installed each time we want to update the settings.

So I thought it could be cool if I can just push files around between my machines with one command. Now: we can use rsync or scp but /etc/portage is owned by root so we either have to change the permissions to a user we use to ssh or a group that user is in.

Portage users

First change portage permissions of /etc/portage, now all users in the portage group will be able to modify the configuration

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chown -R root:portage /etc/portage
chmod -R g+w /etc/portage

Synchronizing

We can do a rsync from different machine with:

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rsync -r /etc/portage REMOTEHOST:/etc --exclude=".git" --exclude="make.profile" --copy-unsafe-links

Reminder that this can also be done as a cron job!

Portage snapshots with git

Probably the best thing I got out of genlica is that I engineered a script to automatically do a git commit of the changes to the portage configuration.

Emerge git

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emerge --noreplace --verbose dev-vcs/git

Copy the file that does the snapshots

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mkdir -p /etc/portage/postsync.d
curl -o /etc/portage/postsync.d/99-degitmerge.sh "https://gitlab.com/xgqt/genlica/-/raw/master/portage/postsync.d/99-degitmerge.sh"

Portage system replication

:: gentoo, portage, sysadmin, system

By: Maciej Barć

Intro

Backing up using this method takes a lot less space - ~60MB (without distfiles) and can be restored on almost any system (running portage) and tweaked afterwards for, say, CPU architecture. I've created a a short script with similar method in here.

What we need

  • ebuild repositories are installed with git
  • distfiles (those might be gone when we want to replicate)

Backup

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# System info
emerge --info > info.txt

# Portage tree
cp -Lr /etc/portage .

# Portage layout
tree -a -L 2 /etc/portage > layout.txt

# Packages in @world
cp /var/lib/portage/world .

# Installed sets
cp /var/lib/portage/world_sets .

# Installed packages (with versions)
qlist --installed --nocolor --umap > qlist-use.txt
qlist --installed --nocolor --verbose > qlist-ver.txt

# Distfiles
cp -rv "$(portageq envvar DISTDIR)" distfiles

# Ebuild database
cp -r /var/db/pkg pkgdb

Restoration

To faithfully restore the system perform those actions as root

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# Copy the portage tree to /etc
rm -dr /etc/portage
cp -r portage /etc/portage

# Checkout the gentoo repo to a commit specified in info.txt
cd "$(portageq get_repo_path / gentoo)"
git checkout # <commit ID>

# Copy distfiles
cp -r distfiles/* "$(portageq envvar DISTDIR)"/

# Fake-install @world and sets
cp world /var/lib/portage/world
cp world_sets /var/lib/portage/world_sets

# Emerge the exact packages from qlist-ver.txt
emerge --keep-going=y -1Oav $(sed 's/^/=/' qlist-ver.txt)