I'm guessing that you are not particularly familiar with git, but a 'checkout' is essentially trying to find the code at a point in time. My guess is that it is a tag and you probably won't have it until you fetch from the remote repo.

Usually the remote repo will be called 'origin', but you can check like this:

cd /home/git/gitaly
sudo -u git -H git remote -v

Assuming that it's called 'origin', it should give output like this:

origin	https://gitlab.com/gitlab-org/gitaly.git (fetch)
origin	https://gitlab.com/gitlab-org/gitaly.git (push)

Assuming that's right (if not, use the remote name that you see instead of 'origin' from teh command above), then fetch all the tags like this:

sudo -u git -H git fetch origin --tags

Then try the checkout again (you can rerun the same command as you did previously, but now you know the name of the tag, you can just explicitly use that):

sudo -u git -H git checkout v0.11.2

Hopefully that gets you going again. :)

Did you use exactly what is in your post? Including all the spaces and no updates specific to your server and scenario? If so, that's almost certainly the issue.

You will need to update some of the values. Let me write it out but with some comments so that hopefully it is a bit clearer. Note that comments start with '#'. The '#' and everything after it (on the same line) is ignored. E.g.:

# this is a comment and will be ignored...

Try pasting that in the commandline and hit enter and you will see that nothing happens... (No error, nothing at all...). So I'll provide the code again, but this time with some inline comments.:

# This sets the variable '$MYSQL_USER' to have the value 'root'
MYSQL_USER=root

# The next line sets the variable '$MYSQL_PASS' - so you need to include your MySQL root password.
# If your password includes spaces and/or special characters, enclose in single quotes.
# E.g.:
# MYSQL_PASS='My_MySQL_root_password'
MYSQL_PASS=   # include your password after the "=" with no spaces...

# This needs to be the IP address to the server that is running MySQL with your existing GitLab DB
# E.g.:
# OLD_SERVER_IP=192.168.1.108
# Or if it's on the same server (not recommended but should probably work):
# OLD_SERVER_IP=127.0.0.1
OLD_SERVER_IP=    # include the desired IP address after the "="; again no spaces

# this next part will generate a file called "/tmp/commands.load" and uses the values of the variables that you set above.
cat > /tmp/commands.load 

That should complete with no errors. To double check that it worked, try running this:

cat /tmp/commands.load

If I run the above commands, with my examples, this is the full output (Note that the 'root@tkldev ~# ' is the prompt from my local server):

root@tkldev ~# MYSQL_USER=root
root@tkldev ~# MYSQL_PASS='My_MySQL_root_password'
root@tkldev ~# OLD_SERVER_IP=192.168.1.108
root@tkldev ~# cat > /tmp/commands.load 

Then to double check the file created:

root@tkldev ~# cat /tmp/commands.load
LOAD DATABASE
 FROM mysql://root@192.168.1.108/gitlab_production
 INTO postgresql://gitlabpsql@unix://var/opt/gitlab/postgresql:/gitlabhq_production
WITH include no drop, truncate, disable triggers, create no tables,
 create no indexes, preserve index names, no foreign keys,
 data only
ALTER SCHEMA 'gitlab_production' RENAME TO 'public'
;


Hopefully that makes things a little clearer?!