CODEWITHSUNDEEP
mercurialbackupbackup-strategiesrhodecode
Rajeev Saraswat
Rajeev Saraswat

Reputation: 11

Hg ( Merculrial ) Backup policy

We have 500 plus Hg repositories and am looking for a quick and efficient want of backup. Is there a script or Tool that we can use to backup these repositories. We tried Hg bundle, hg clone and regular file system backup but they are not helping.

Is there a standard practice, or some documentation for Hg repositories backup policy?

A follow-up question, what will happen when a user is in a middle of pushing the changeset and we start the backup ?

We do use RhodeCode to publish the Hg repositories. Thanks

Upvotes: 1

Views: 171

Answers (2)

Christophe Muller
Christophe Muller

Reputation: 5090

I have a somewhat similar solution of cloning/pulling from a backup server but I trigger the backup on an hg hook.

In the main server global hgrc, I have:

changegroup.backup = .../backup.sh

and in backup.sh something like:

REPO=`hg root`
ts sshpass -p '...' ssh hg@backupserver "~/bin/pull.exp $REPO" 2>> $LOG

Ts (task spooler) allows the operation to happen asynchronously. The expect script is handling the fact that the repository might be new (thus performing an hg clone --noupdate) or already existing (thus performing an hg pull) and also can give the ssh key a passphrase when requested.

Pushing on the second server is only allowed for the backup hook, so no issue of multiple heads or needed force can happen.

What I find interesting in this type of real time backup is that in case of crash of the main server, it should be much faster to switch to the backup one.

Upvotes: 0

Ry4an Brase
Ry4an Brase

Reputation: 78350

There's no standard. A true FS-level snapshot taken during a push will be fine, but a non-instantaneous mirroring operation (recursive copy) could end up with a corrupt repo, though it would be repairable to the pre-push state.

In the past I've done something as simple as:

for repo in $(find /srv/repos -type d -name .hg | sed 's/\.hg$//') ; do
    hg --cwd $repo --repository $repo push ssh://backupserver/$(basename $repo)
done

That pushes all repos to a remote ssh server, incrementally, with full updating-while-pushing integrity, creating them if necessary.

Upvotes: 2

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