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# Documentation
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Documentation for Kira Linux
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Documentation for Kira Linux
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[Documantation Index](src/index.md)
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Documentation for Kira Linux
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# Documentation for Kira Linux
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[Update Process](updates.md)
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[Back to index](index.md)
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# Update process
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Main feature of Kira Linux is atomic (to some degree) update process that allows roll back of unsuccessful or broken updates.
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We achieve this by relying on bcachefs snapshots and subvolumes.
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The main routine is as follows:
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1. Before update process snapshot /usr and /var directories.
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Put snapshots to **/bzz-snaps** directory named as **bzz-usr-yyyy-mm-ddTHH-MM-SS** and **bzz-var-yyyy-mm-ddTHH-MM-SS**
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2. Set update status in /var/lib/hive-up/hyve-db.json as failed (update_status = false)
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3. Perform update (pacman -Su)
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4. If update was successful, set update status in /var/lib/hive-up/hyve-db.json to true.
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5. Process with reboot.
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6. On boot Nyanit reads update status from /var/lib/hive-up/hyve-db.json and if it is false roll back latest snapshots from /bzz-snaps dir.
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7. Otherwise boot as usual.
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The main internal routine is as follows:
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1. Before update process snapshot /usr and /var directories.
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Put snapshots to `/bzz-snaps` directory named as `bzz-usr-yyyy-mm-ddTHH-MM-SS` and `bzz-var-yyyy-mm-ddTHH-MM-SS`
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2. Set update status in `/var/lib/hive-up/hyve-db.json` as failed (`update_status = false`)
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3. Perform update (`pacman -Su`)
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4. If update was successful, set update status in `/var/lib/hive-up/hyve-db.json` to true.
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5. Process with reboot.
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6. On boot **nyanit** reads update status from `/var/lib/hive-up/hyve-db.json` and if it is false **nyanit** roll back latest snapshots from `/bzz-snaps` dir.
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7. Otherwise boot as usual.
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