[CentOS-devel] Getting Sources for an older revision from git.centos.org

Johnny Hughes

johnny at centos.org
Thu Jun 12 16:16:20 UTC 2014


So, if you want to get SOURCES from the look-aside cache using
get_sources.sh for an older revision, you might possibly hit a DETACHED
HEAD snag that I just hit.

1.  git checkout   https://git.centos.org/git/rpms/firefox.git

(or if you already have it, git pull from within the firefox directory)

2. If you look at firefox's log, there are 2 things to build for c7 GA
and the beta and the RC are there, so four commits for four different SRPMS.

the command "git log" shows us that:

commit 9e6d29c3f16d3692c9cb30371b227d6c08edd591
Author: CentOS Sources <bugs at centos.org>
Date:   Tue Jun 10 16:10:41 2014 -0400

    import firefox-24.6.0-1.el7_0

commit 9a1d2ed9c6faf3da49e78eb41872bde7cfefece2
Author: CentOS Sources <bugs at centos.org>
Date:   Mon Jun 9 03:31:45 2014 -0400

    import firefox-24.5.0-1.el7

commit 6ca8db34a0fc78f0454e96c6f9b715df86529195
Author: CentOS Buildsys <bugs at centos.org>
Date:   Tue Mar 18 09:47:19 2014 +0000

    import firefox-24.4.0-1.el7.src.rpm

commit 29a772037be917dc94c382403705291699865c88
Author: CentOS Buildsys <bugs at centos.org>
Date:   Fri Nov 8 10:07:07 2013 +0000

    import firefox-24.1.0-3.el7.src.rpm

commit 591789b9e3e230f74954ed27b377f8e72068d895
Author: CentOS Buildsys <bugs at centos.org>
Date:   Fri Nov 8 10:07:10 2013 +0000

    init git for firefox

3.  I want to get the sources for .. firefox-24.5.0-1.el7 ... at
revision 9a1d2ed9c6faf3da49e78eb41872bde7cfefece2.  I tried and failed
to get it by simply doing:

git checkout 9a1d2ed9c6faf3da49e78eb41872bde7cfefece2

and then

get_sources.sh

4.  The problem is that going one commit back changes git's HEAD to a
link to the commit number and not what it is when you are on the c7
branch .. and that breaks the get_sources.sh script's branch detection. 
For more on what detached head looks like see this:

http://alblue.bandlem.com/2011/08/git-tip-of-week-detached-heads.html


5.  So, we will try to fix the get_source.sh script to work in that
situation .. in the meantime, you can do this instead.

=================================================

1. go to the firefox repo and make sure you are on the c7 branch:

git checkout c7

2.  Do a git log and find the revision you want (see the above list, step 2)

3.  I want to get the sources for "firefox-24.5.0-1.el7", which is one
revision back from current ... so do this command:

git reset --hard c7~1

4.  It will tell you this:

HEAD is now at 9a1d2ed import firefox-24.5.0-1.el7

5.  Now you can use get_sources.sh to pull the SOURCES for
firefox-24.5.0-1.el7

get_sources.sh

6.  Once the sources are done downloading, build the SRPM with the command:

rpmbuild --define "_topdir $(pwd)" --define "dist .el7" -bs --nodeps
SPECS/firefox.spec

7.  To get back to the current revision of firefox in the c7 branch do this:

git pull --ff-only

8.  It will tell you this:

Updating 9a1d2ed..9e6d29c
Fast-forward
 .firefox.metadata                          |  4 ++--
 .gitignore                                 |  4 ++--
 SOURCES/xulrunner-2.0-chromium-types.patch | 34
----------------------------------
 SOURCES/xulrunner-webrtc-secondarch.patch  | 34
----------------------------------
 SPECS/firefox.spec                         | 14 ++++++++------
 5 files changed, 12 insertions(+), 78 deletions(-)
 delete mode 100644 SOURCES/xulrunner-2.0-chromium-types.patch
 delete mode 100644 SOURCES/xulrunner-webrtc-secondarch.patch


============================================

If you wanted to go two revisions back (in this example that would be
version  "firefox-24.4.0-1.el7.src.rpm" , you would do:


git reset --hard c7~2

(the ~1 or ~2 is the number of revisions to go back)

Don't forget to go back to the top with the "git pull --ff-only" when
you are ready to be on the current revision again

As I said, we are going to try to come up with better branch detection
for getting the sources, but until we do, this should help anyone with
this issue.

Thanks very much to Mike McLean and Karanbir Singh for helping figure
out the issue and the workaround.

Thanks,
Johnny Hughes




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