375e974935
In the gerrit master configure the replication plugin to push changes from refs/changes/ to refs/tmp/changes/: remote.NAME.push = +refs/changes/*:refs/tmp/changes/* Install this hook script as post-receive hook in replicated repositories hosted by a gerrit slave which are updated by push replication from the corresponding gerrit master. In the slave repository configure receive.hideRefs = refs/changes/ in order to not advertise the big number of refs in this namespace when replication is pushing another change. Whenever a ref arrives under refs/tmp/changes/ this git post-receive hook will move it to refs/changes/. This helps to avoid the large overhead of receive-pack advertising all refs/changes/ refs when the gerrit master pushes a pack. We observed a speedup by a factor of 10 when using this replication strategy for replication of a large repository with >400k refs across a WAN link from Germany to Canada. Change-Id: I6115c1ddbcb8e39cc0bdea999262287a9dc36743
80 lines
3.0 KiB
Bash
Executable File
80 lines
3.0 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (C) 2017 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# --------------------------------------------------------
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# Install this hook script as post-receive hook in replicated repositories
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# hosted by a gerrit slave which are updated by push replication from the
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# corresponding gerrit master.
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#
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# In the gerrit master configure the replication plugin to push changes from
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# refs/changes/ to refs/tmp/changes/
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# remote.NAME.push = +refs/changes/*:refs/tmp/changes/*
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# remote.NAME.push = +refs/heads/*:refs/heads/*
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# remote.NAME.push = +refs/tags/*:refs/tags/*
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#
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# In the replicated repository in the gerrit slave configure
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# receive.hideRefs = refs/changes/
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# in order to not advertise the big number of refs in this namespace when
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# the gerrit master's replication plugin is pushing a change
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#
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# Whenever a ref under refs/tmp/changes/ is arriving this hook will move it
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# to refs/changes/. This helps to avoid the large overhead of advertising all
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# refs/changes/ refs to the gerrit master when it replicates changes to the
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# slave..
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#
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# Make this script executable then link to it in the repository you would like
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# to use it in.
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# cd /path/to/your/repository.git
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# ln -sf <shared hooks directory>/post-receive-move-tmp-refs hooks/post-receive
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#
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# If you want to use this by default for repositories on the Gerrit slave you
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# can set up a git template directory $TEMPLATE_DIR/hooks/post-receive and
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# configure init.templateDir in the ~/.gitconfig of the user that receives the
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# replication on the mirror host. That way when a new repository is created on
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# the master and hence on the mirror (if configured that way) it will
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# automatically have the "tmp-refs" commit hook installed.
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# See https://git-scm.com/docs/git-init#_template_directory for details.
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readonly NULL_SHA1=0000000000000000000000000000000000000000
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# move new changes arriving under refs/tmp/changes/ to refs/changes/
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mv_tmp_refs()
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{
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oldrev=$1
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newrev=$2
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refname=$3
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case "$refname","$oldrev" in
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refs/tmp/changes/*,$NULL_SHA1)
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short_refname=${refname##refs/tmp/changes/}
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$(git update-ref refs/changes/$short_refname $newrev $NULL_SHA1 2>/dev/null)
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$(git update-ref -d $refname $newrev 2>/dev/null)
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echo "moved \"$refname\" to \"refs/changes/$short_refname\""
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;;
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esac
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return 0
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}
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GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
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if [ -z "$GIT_DIR" ]; then
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echo >&2 "fatal: post-receive: GIT_DIR not set"
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exit 1
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fi
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# read ref updates passed to post-receive hook
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while read oldrev newrev refname
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do
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mv_tmp_refs $oldrev $newrev $refname || continue
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done
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