add migration example, plus some other little mig doc fixes
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Sitaram Chamarty
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doc/g2migr-example.mkd
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269
doc/g2migr-example.mkd
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# migration example
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This shows what a typical migration would look like, using a test setup.
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[[TOC]]
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## existing setup
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The existing gitolite is the latest in the "g2" (v2.x) branch.
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First, the rc file has the following lines different from the default:
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-$GL_WILDREPOS = 0;
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+$GL_WILDREPOS = 1;
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-$GL_GITCONFIG_KEYS = "";
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+$GL_GITCONFIG_KEYS = ".*";
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Next, the conf/gitolite.conf file in `~/.gitolite`:
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repo gitolite-admin
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RW+ = tester u1
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repo testing
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RW+ = @all
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repo foo
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RW+ = u1 u2
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RW+ NAME/ = u1
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RW+ NAME/u2 = u2
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repo bar
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RW = u2
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repo baz/..*
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C = u3 u4
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RW+ = CREATOR
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config foo.bar = baz
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(Note that this conf file has NAME/ rules, which **have changed**
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significantly in g3; see [here][g2i-name] for details).
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These are the repos already existing
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$ find repositories -name "*.git" | sort
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repositories/bar.git
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repositories/baz/u3.git
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repositories/baz/u4.git
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repositories/baz/uthree.git
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repositories/foo.git
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repositories/gitolite-admin.git
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repositories/testing.git
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The config entries exist for all the baz/ repos:
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$ grep -2 foo `find repositories -name "config" `
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repositories/baz/uthree.git/config-[gitweb]
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repositories/baz/uthree.git/config- owner = u3
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repositories/baz/uthree.git/config:[foo]
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repositories/baz/uthree.git/config- bar = baz
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--
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repositories/baz/u4.git/config-[gitweb]
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repositories/baz/u4.git/config- owner = u4
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repositories/baz/u4.git/config:[foo]
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repositories/baz/u4.git/config- bar = baz
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--
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repositories/baz/u3.git/config-[gitweb]
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repositories/baz/u3.git/config- owner = u3
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repositories/baz/u3.git/config:[foo]
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repositories/baz/u3.git/config- bar = baz
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## preparing for the migration
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### getting g3
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Fortunately this is easy here; I just happened to have the repo already
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fetched so I just had to switch branches. You may have to 'git clone ...'
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from github.
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$ cd gitolite
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$ git checkout master
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Branch master set up to track remote branch master from origin.
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Switched to a new branch 'master'
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### run check-g2-compat
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This is a quick and dirty program to catch some of the big issues.
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$ cd
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$ gitolite/check-g2-compat
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INFO This program only checks for uses that make the new g3 completely unusable
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or that might end up giving *more* access to someone if migrated as-is.
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It does NOT attempt to catch all the differences described in the docs.
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INFO 'see docs' usually means doc/g2migr.mkd
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(online at http://sitaramc.github.com/gitolite/g3/g2migr.html)
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checking rc file...
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NOTE GL_ADMINDIR is in the right place; assuming you did not mess with
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GL_CONF, GL_LOGT, GL_KEYDIR, and GL_CONF_COMPILED
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checking conf file(s)...
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SEVERE NAME rules; see docs
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checking repos...
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WARNING found 3 gl-creater files; see docs
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...all done...
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## the actual migration
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Here's the actual migration, step by step
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### step 1
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$ ls -a bin
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. gl-admin-push gl-install gl-setup-authkeys gl-VREF-DUPKEYS
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.. gl-auth-command gl-mirror-push gl-system-install gl-VREF-EMAIL_CHECK
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gitolite_env.pm gl-compile-conf gl-mirror-shell gl-time gl-VREF-FILETYPE
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gitolite.pm gl-conf-convert gl-query-rc gl-tool gl-VREF-MERGE_CHECK
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gitolite_rc.pm gl-dryrun gl-setup gl-VREF-COUNT sshkeys-lint
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$ rm -rf bin;mkdir bin
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$ grep GL_PACKAGE .gitolite.rc
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$GL_PACKAGE_CONF = "/home/g3/share/gitolite/conf";
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$GL_PACKAGE_HOOKS = "/home/g3/share/gitolite/hooks";
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$ rm -rf share
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$GL_PACKAGE_HOOKS = "/home/g3/share/gitolite/hooks";
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$ rm -rf share
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$ mv .gitolite.rc old.grc
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(still on step 1, this is substep 3) notice we are cloning **on the server**,
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using a **full path** to the repo.
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$ git clone repositories/gitolite-admin.git old.ga
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Cloning into 'old.ga'...
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done.
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$ rm -rf repositories/gitolite-admin.git/
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Since I'm not interested in preserving the logs and don't have any custom
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hooks:
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$ rm -rf .gitolite
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### step 2
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I have no variables that *must* be preset, since the report by
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`check-g2-compat` is clear.
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### step 3
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Here we install the new gitolite. Remember we already got the new software
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(in order to run 'check-g2-compat').
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Just check that bin is empty, then run 'install -ln' from the gitolite source
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tree:
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$ ls -al bin
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total 8
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drwxrwxr-x 2 g3 g3 4096 Apr 24 10:57 .
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drwx------ 8 g3 g3 4096 Apr 24 10:59 ..
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$ gitolite/install -ln
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$ ls -al bin
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total 8
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drwxrwxr-x 2 g3 g3 4096 Apr 24 11:01 .
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drwx------ 8 g3 g3 4096 Apr 24 10:59 ..
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lrwxrwxrwx 1 g3 g3 30 Apr 24 11:01 gitolite -> /home/g3/gitolite/src/gitolite
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OK that went well. Now setup gitolite. You don't need a key here; just use a
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random name:
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$ gitolite setup -a admin
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Initialized empty Git repository in /home/g3/repositories/gitolite-admin.git/
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### step 4
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Now go to your old clone, and push it:
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$ cd old.ga
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$ gitolite push -f
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...usual git progress output deleted...
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remote: FATAL: git config foo.bar not allowed
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remote: check GIT_CONFIG_KEYS in the rc file
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To /home/g3/repositories/gitolite-admin.git
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+ 7eb8163...1474770 master -> master (forced update)
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Aaha! I forgot to set `CONFIG_KEYS` (new name for `GL_GIT_CONFIG_KEYS`) in
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the new rc file so fix that:
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$ vim ~/.gitolite.rc
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(edit and set it to `.*` for now)
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and push again:
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$ gitolite push -f
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Everything up-to-date
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Damn. We have to make a dummy commit to allow the push to do something.
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But wait! We forgot fix the [NAME/][g2i-name] rules, so may as well fix
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those, add, and push:
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$ vim conf/gitolite.conf
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# change all NAME/ to VREF/NAME/
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# append a '- VREF/NAME/ = @all' at the end
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# save
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git add conf
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$ git commit -m name-rules
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... some output for add...
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$ gitolite push -f
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Counting objects: 1, done.
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Writing objects: 100% (1/1), 181 bytes, done.
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Total 1 (delta 0), reused 0 (delta 0)
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Unpacking objects: 100% (1/1), done.
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To /home/g3/repositories/gitolite-admin.git
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1474770..4c2b41d master -> master
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### step 5
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The only thing left is to fix up the gl-creater files:
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$ cd $HOME/repositories
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$ find . -type d -name "*.git" -prune | while read r
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> do
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> mv $r/gl-creater $r/gl-creator
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> done 2>/dev/null
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And we're done!
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## checking things out
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Let's see what repos u3 has:
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ssh u3 info
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hello u3, this is g3@sita-lt running gitolite3 v3.0-11-g090b0f5 on git 1.7.7.6
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C baz/..*
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R W baz/u3
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R W baz/uthree
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R W gitolite-admin
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R W testing
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That's a combination of 'info' and 'expand', by the way. There is no expand
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command any more.
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How about adding a new repo and checking if the config entries made it?
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$ git ls-remote u4:baz/ufour
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Initialized empty Git repository in /home/g3/repositories/baz/ufour.git/
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$ grep -A1 foo `find repositories -name "config" `
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repositories/baz/u3.git/config:[foo]
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repositories/baz/u3.git/config- bar = baz
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--
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repositories/baz/u4.git/config:[foo]
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repositories/baz/u4.git/config- bar = baz
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--
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repositories/baz/ufour.git/config:[foo]
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repositories/baz/ufour.git/config- bar = baz
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--
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repositories/baz/uthree.git/config:[foo]
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repositories/baz/uthree.git/config- bar = baz
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And there it is, in the second block of lines...
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And now we're really done.
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@ -145,7 +145,7 @@ Some of them have links where there is more detail than I want to put here.
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business touching these anyway; if you did, move them into the expected
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default locations before attempting to run `gitolite setup`
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* `GL_GITCONFIG_KEYS` -- is now `GITCONFIG_KEYS`.
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* `GL_GITCONFIG_KEYS` -- is now `GIT_CONFIG_KEYS`.
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* `GL_LOGT` -- now has a fixed value; email me if this is a problem.
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@ -166,13 +166,21 @@ are the steps:
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you were to a default install of the old gitolite, the less time a
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migration will take.)
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This includes at least running `check-g2-compat` to see what are the big
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issues you might need to address during the migration.
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### the actual migration
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(Note: You may also like the [example migration][g2migr-example] page).
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**Note**: nothing in any of the gitolite install/setup/etc will ever touch the
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*data* in any repository except the gitolite-admin repo. The only thing it
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will normally touch in normal repos is the `update` hook.
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1. **On the server**, carefully wipe out the old gitolite:
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**Note: all migration happens on the server; you do not need your
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workstation**.
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1. Carefully wipe out the old gitolite:
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* The **code**
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@ -209,7 +217,11 @@ will normally touch in normal repos is the `update` hook.
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your new rc file.
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3. Install gitolite g3; see [quick install and setup][qi] or [install][]
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followed by [setup][].
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followed by [setup][]. However, the 'setup' step need not supply a
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private key. You can run it as `gitolite setup -a admin`.
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NOTE: ignore any 'split conf not set, gl-conf present...' errors at this
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time. You may see none, some, or many. It does not matter right now.
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4. Make sure your gitolite-admin clone has the correct pubkey for the
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administrator in its `keydir` directory, then run [`gitolite push
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