0store-secure-add — add an implementation to the system cache
This command imports the current directory into the system-wide shared
Zero Install cache, as /var/cache/0install.net/implementations/DIGEST.
This allows a program downloaded by one user to be shared with other
The current directory must contain a file called ’.manifest’ listing
all the files to be added (in the format required by DIGEST), and this
file must have the given digest. If not, the import is refused.
Therefore, it is only possible to add a directory to the cache if its
name matches its contents.
It is intended that it be safe to grant untrusted users permission to
call this command with elevated privileges. To set this up, see below.
SETTING UP SHARING
To enable sharing, the system administrator should follow these steps:
Create a new system user to own the cache:
adduser --system zeroinst
Create the shared directory, owned by this new user:
chown zeroinst /var/cache/0install.net
Use visudo(8) to add these lines to /etc/sudoers:
ALL ALL=(zeroinst) NOPASSWD: /usr/bin/0store-secure-add
Create a script called 0store-secure-add-helper in PATH to call it.
This script must be executable and contain these two lines:
exec sudo -S -u zeroinst /usr/bin/0store-secure-add "$@" < /dev/null
The other Zero Install programs will call this helper script
System-wide Zero Install cache.
Copyright (C) 2009 Thomas Leonard.
You may redistribute copies of this program under the terms of the GNU
Lesser General Public License.
This program is EXPERIMENTAL. It has not been audited. Do not use it
yet in security-critial environments.
The env_reset line in sudoers may not be required. sudo(1) seems to do
If sudo let us check whether we could call a command then we could
switch to using it automatically, instead of needing to add the helper
script. Currently, sudo delays for one second and writes to auth.log if
we try to use this system when it hasn’t been set up.
Please report bugs to the developer mailing list:
Zero Install was created by Thomas Leonard.
The Zero Install web-site: