Error 403 when git push (multiple github accounts on the same mac)

When you are using a Git repository as a central repo (as you seem to be), you generally should not have a working directory on that repo. The reason for this is listed in the error you mentioned: pushing into a branch which is checked out can cause the working tree to become out of sync.

If the people you are sharing with can use Git, then you instead can set up a bare repository on the server, then push to it.

# On the server
git init --bare ~/project.git

# On your computer
git remote add origin ssh://username@example.com/~/project.git
git push origin master

# On everyone else's computer
git remote add origin http://example.com/~david/project.git
git pull origin master
git checkout master

If they cannot use Git, then you'll need a slightly more complicated workflow:

# On the server, once
git init ~/project
git config receive.denyCurrentBranch ignore

# On your computer
git remote add origin ssh://username@example.com/~/project
git push origin master

# On the server after each push
cd ~/project
git reset --hard

After this step, then the files should be available under /project

After many tries I've found the solution. The problem was in incorrect VirtualHost configuration for git-http-backend.

Here's my working config:

<IfModule mod_ssl.c>
<VirtualHost _default_:443>

        DocumentRoot /git/myrepos

        SetEnv GIT_PROJECT_ROOT /git/myrepos
        SetEnv GIT_HTTP_EXPORT_ALL
        ScriptAlias /myrepos/ /usr/lib/git-core/git-http-backend
        AliasMatch ^/myrepos/(.*/objects/[0-9a-f]{2}/[0-9a-f]{38})$ /git/myrepos/$1
        AliasMatch ^/repos/(.*/objects/pack/pack-[0-9a-f]{40}.(pack|idx))$ /git/myrepos/$1

        ScriptAliasMatch "(?x)^/(.*/(HEAD | info/refs | objects/(info/[^/]+ | [0-9a-f]{2}/[0-9a-f]{38} | pack/pack-[0-9a-f]{40}\.(pack|idx)) | git-(upload|receive)-pack))$" /usr/lib/git-core/git-http-backend/$1

        <Directory "/usr/lib/git-core/">
        Options +ExecCGI
        Allow From All
        </Directory>

        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                AllowOverride None
                Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                Order allow,deny
                Allow from all
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        LogLevel warn
        CustomLog ${APACHE_LOG_DIR}/ssl_access.log combined

        SSLEngine on
        SSLCertificateFile    /etc/ssl/git.crt
        SSLCertificateKeyFile /etc/ssl/git.key

        <FilesMatch "\.(cgi|shtml|phtml|php)$">
                SSLOptions +StdEnvVars
        </FilesMatch>
        <Directory /usr/lib/cgi-bin>
                SSLOptions +StdEnvVars
        </Directory>

        BrowserMatch "MSIE [2-6]" \
                nokeepalive ssl-unclean-shutdown \
                downgrade-1.0 force-response-1.0
        BrowserMatch "MSIE [17-9]" ssl-unclean-shutdown


<Location /repo1.git>
Order deny,allow
Deny from all
Allow from all
AuthName "GIT Authentication"
AuthType Basic
AuthBasicProvider ldap
AuthzLDAPAuthoritative off
AuthLDAPBindDN domain\user
AuthLDAPBindPassword passwd
AuthLDAPURL ldap://ldap.server:389/ou=git,DC=domain?sAMAccountName
Require ldap-group cn=git_repo1,ou=git,dc=domain
</Location>

</VirtualHost>
</IfModule>

Now all git operations works properly with git-http-backend via https with ldap authorization :)

Maybe it will be useful for someone.