[Qa-jenkins-scm] [jenkins.debian.net] 01/01: add design for reproducible remote building, review+feedback most welcome

[Holger Levsen]

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in repository jenkins.debian.net.

commit 66238afaaf715018dc8f628d9456dc6429121f95
Author: Holger Levsen <holger at layer-acht.org>
Date:   Mon Aug 10 12:20:21 2015 +0200

    add design for reproducible remote building, review+feedback most welcome
---
 TODO | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/TODO b/TODO
index 7d2fcf7..65771a6 100644
--- a/TODO
+++ b/TODO
@@ -207,7 +207,7 @@ properties:
 ** variation of $TERM and $COLUMN (and maybe $LINES), unset in the first run, set to "linux" and "77" (and maybe "42") in the 2nd run. maybe vary $SHELL too.
 *** actually TERM is set to "linux" by default already, COLUMN is unset
 
-* remote building on amd64
+* status of remote build nodes for amd64
 ** profitbricks-build1-amd64 is setup
 *** squid needs proper configuration
 *** tmpfs needs to be set up
@@ -228,6 +228,57 @@ properties:
   <mapreri> that would be wonderful.
 ----
 
+==== design for reproducible remote building
+
+* open questions:
+** save build-host in build_duration table too? (and change to saving the time of a single build, not both combined)
+
+* reproducible_build.sh behaviour change:
+** called without param: behave as always
+** called with a single param, "1" or "2": do first or second build (as specified below)
+** called with two params: $node1 and $node2 where the build should happen.
+
+* reproducible_build.sh (with two params) will be still always be run on the main node, that is the one holding reproducible.db, so jenkins.d.n atm
+* job definitions:
+** reproducible_build_amd64_1 runs "reproducible_build.sh profitbricks-build1-amd64 profitbricks-build2-amd64"	# 8 core machines with 32gb ram
+** reproducible_build_amd64_2 runs "reproducible_build.sh profitbricks-build1-amd64 profitbricks-build2-amd64"
+** reproducible_build_amd64_3 runs "reproducible_build.sh profitbricks-build1-amd64 profitbricks-build2-amd64"
+** reproducible_build_amd64_4 runs "reproducible_build.sh profitbricks-build1-amd64 profitbricks-build2-amd64"
+** reproducible_build_amd64_5 runs "reproducible_build.sh profitbricks-build1-amd64 profitbricks-build2-amd64"
+** reproducible_build_amd64_6 runs "reproducible_build.sh profitbricks-build2-amd64 profitbricks-build1-amd64"
+** reproducible_build_amd64_7 runs "reproducible_build.sh profitbricks-build2-amd64 profitbricks-build1-amd64"
+** reproducible_build_amd64_8 runs "reproducible_build.sh profitbricks-build2-amd64 profitbricks-build1-amd64"
+** reproducible_build_amd64_9 runs "reproducible_build.sh profitbricks-build2-amd64 profitbricks-build1-amd64"
+** reproducible_build_amd64_10 runs "reproducible_build.sh profitbricks-build2-amd64 profitbricks-build1-amd64"
+** reproducible_build_armhf_1 runs "reproducible_build.sh wbq0-armhf-rb bpi0-armhf-rb"			# wbq0 and cbxi4pro0 are the quad cores
+** reproducible_build_armhf_2 runs "reproducible_build.sh wbq0-armhf-rb cbxi4pro0-armhf-rb"		# with 2gb ram and and the other two
+** reproducible_build_armhf_3 runs "reproducible_build.sh cbxi4pro0-armhf-rb hb0-armhf-rb.debian.net"	# have dual cores with 1gb ram
+** reproducible_build_armhf_4 runs "reproducible_build.sh cbxi4pro0-armhf-rb wbq0-armhf-rb"
+
+* then we have a new script, reproducible_info.sh which just outputs key-value pairs, like "ARCH=armhf", DATETIME="Mo 10. Aug 11:56:22 CEST 2015" and "TZ=UTC" and whatever.
+** this script is run on all nodes, but each run is triggered by a single job running on the main node (jenkins atm), so the results can be captured in /srv/reproducible-results/node-information/$NODE and then eg be used by reproducible_html_dashboard.sh to create the table with the differences between 1st and 2nd build...
+** /srv/reproducible-results/node-information/$NODE could also be read by reproducible_build.sh to determine the dpkg-architecture a node is captable of building, but I think we also want that info to be encoded in the build job names, so probably there's no need to read it...
+
+* how to build remotely, some terms and remarks:
+** main node = the one running reproducible_build.sh with two params, so jenkins.d.n atm
+** node = generic term for node1 or node2
+** please note the difference between /srv/workspace/reproducible-builds and /srv/workspace/reproducible-results and /srv/workspace/reproducible-builds/$NODE and /srv/workspace/reproducible-builds/pending and whether these are on a node or on the main node.
+
+
+1. reproducible_build.sh on main node determines what to build,
+2. downloads the sources, and put's the sha256sum of the .dsc file into /srv/workspace/reproducible-builds/$NODE/$SUITE/$ARCH/$PKG/$VERSION on the main node
+3. throws the source files away
+4. scp's /srv/workspace/reproducible-builds/$NODE/$SUITE/$ARCH/$PKG/$VERSION on the node where this should be build 1st
+5. runs "ssh $NODE1 /srv/jenkins/bin/reproducible_build.sh 1"
+6. this causes a 1st build, which downloads the sources as specified in /srv/workspace/reproducible-builds/$NODE/$SUITE/$ARCH/$PKG/$VERSION and compares the sha256sum and builds it and copies the result to /srv/workspace/reproducible-results/$NODE/$SUITE/$ARCH/$PKG/$VERSION and exits.
+7. reproducible_build.sh on the main node then tries to scp the result from $NODE:/srv/workspace/reproducible-results/$NODE...
+8. reproducible_build.sh on the main node then triggers the 2nd build as the 1st.
+9. voila
+
+* more open questions:
+** i believe "reproducible_build.sh 1" should immediatly move /srv/workspace/reproducible-builds/$NODE/$SUITE/$ARCH/$PKG/$VERSION to /srv/workspace/reproducible-builds/pending/$SUITE/$ARCH/$PKG/$VERSION (on the node) so it's only build once and so that we can detect stale builds
+** maintenance is general, cleanup of started but interrupted builds...
+
 ==== reproducible Debian armhf
 
 * then: include armhf in index_scheduled

-- 
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