|cd portage/
|git add -A
|snapshot_date{{=}}$(date --date{{=}}@$(( $(cut -f 1 -d " " metadata/timestamp.x) - 86400 )) +%Y-%m-%d)
|git commit -m "Update portage tree to ${snapshot_date}"
|git tag -a -m "Tagging ${snapshot_date}" ${snapshot_date}
}}
{{Note|Concerning the timestamp The subtraction of 86400 (1 day in seconds) above is to account for the downloaded tarball and fact that the timestamp contained inside: "The snapshot for a given day is generated taken at 00:45 UTC on the following day."and the timestamp contained in the tarball therefore is one day ahead (see {{Path|/usr/bin/emerge-webrsync}}). The meaning of the tag is therefore: contains at least all changes from that day (and possibly a bit more).
== Chroot Setup ==
