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Hi everyone,

I'm _proposing_ this patch to support snapshots.debian.org in live-build.

I think this may be of Debian CUT interest also, to build their live

Uses cases

This patch is very usefull to:

1. debug testing and sid (and squeeze), building a live image and
comparing differences and bugs in packages in any date available in

2. if a package is broken/bugged recently, build a live image from
an earlier date and pin the package to prevent its upgrade.

3. build live images with live-installer when daily debian-installer is
broken/not build by setting the date that have a sucessfull d-i build.

Also, this would make possible for Debian CUT to build live images of
their rolling release, with little patch: lb_binary_debian-installer URL
should be changed from d-i.debian.org/daily-images to
alioth.debian.org/~gilbert-guest/snapshots/ and some function to choose
the correct installer added to debian-snapshots.sh, and maybe more, did
not test.


I did not document the patch in the man pages, but the draft for docs
should be something like:

	--mode debian-snapshots
		to enable debian-snapshots mode (will use latest archive
		snapshot available).

	--debian-snapshots-date YYYYMMDD
		empty (or not set) to use latest archive snapshot, or a
		valid date in snapshots.debian.org URL. It chooses the
		same date for d-i/live-installer, will warn if no daily
		d-i is available for that date.


1. Build a wheezy image as wheezy was of today, and is "frozen" (will
not track latest wheezy repos) in today's date (this is the default, binary
mirror is snapshots.debian.org date):

	lb config --mode debian-snapshots -d wheezy
	sudo lb build

2. Build a wheezy image as wheezy was in 15 April, and is "frozen" (will
not track latest wheezy repos) in that date (this is the default, binary
mirror is snapshots.debian.org date):

	lb config --mode debian-snapshots -d wheezy \
		--debian-snapshot-date 20120415
	sudo lb build

The resulting image should have wheezy as of the date and its
sources.list will have it too.

3. Build a wheezy image from a earlier date state, but make the final
image track the normal wheezy repos (to allow latest packages

	lb config --mode debian-snapshots -d wheezy \
		--debian-snapshot-date 20120415 \
		--mirror-binary http://ftp.debian.org/debian
	sudo lb build

The resulting image would be built as in that date but any packages
upgrades or installs would be from latest testing/wheezy.

4. Build a wheezy image with live-installer (if debian-installer was
built on that date and is available). There is no daily d-i available in
15 April, but there is one in 20120101 (see
http://d-i.debian.org/daily-images/amd64/ for available d-i builds).
This is good to track both d-i bugs and release bugs.

	lb config --mode debian-snapshots -d wheezy \
		--debian-snapshot-date 20120101 --debian-installer live \
		--debian-installer-distribution daily
	sudo lb build

With live-installer, the installed to disk sources.list will be, by
default because live-installer is daily, tracking the latest wheezy/sid

5. Build a wheezy image, with installer, and with a "frozen"
installed to disk system (that will track snapshots.debian.org after
install and not get upgrades until sources.list is updated):

	lb config --mode debian-snapshots -d wheezy \
		--debian-snapshot-date $SNAP_DATE --debian-installer live \
		--debian-installer-distribution daily

	# override debian-installer default installed to disk sources.list
	mkdir -p config/binary_debian-installer
	cat > config/binary_debian-installer/preseed.cfg << EOF
	d-i apt-setup/local0/repository string
http://snapshot.debian.org/archive/debian/$SNAP_DATE stable main
contrib non-free
	d-i mirror/country string manual
	d-i mirror/country seen true
	d-i mirror/http/hostname string snapshot.debian.org
	d-i mirror/http/hostname seen true
	d-i mirror/http/directory string /archive/debian/$SNAP_DATE
	d-i mirror/http/directory seen true
	d-i mirror/http/proxy string
	d-i mirror/http/proxy seen true

	sudo lb build

The examples are for wheezy, but can be adapted to sid. For
stable/squeeze the installer will be the existing stable d-i at the
date (6.0.x).


That's all I can think of right now. I must say, again, that this is
very usefull to track testing/unstable and d-i bugs and also to
workaround them with package pinning.

Please review the patch for "incongruencies", typos that i may have
missed, wrong variable names (debian-snapshots or snapshots-debian?) or
wrong approach. I've made this a live-build --mode option, it may not be
best or desired approach, considering that it makes using backports with
snapshots impossible. Nevertheless I think this patch could be a good
starting point to the final patch.

Sorry for this long email.


Rui Miguel P. Bernardo (1):
  support snapshots.debian.org in live-build

 functions/debian-snapshots.sh            |   65 ++++++++++++++++++++++++++++++
 functions/defaults.sh                    |   38 +++++++++++++++++
 scripts/build/lb_binary_debian-installer |    5 +++
 scripts/build/lb_chroot_apt              |   10 +++++
 scripts/build/lb_config                  |   14 ++++++-
 5 files changed, 130 insertions(+), 2 deletions(-)
 create mode 100644 functions/debian-snapshots.sh


Attachment: 0001-support-snapshots.debian.org-in-live-build.patch
Description: Binary data

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