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       0store-secure-add — add an implementation to the system cache


       0store-secure-add DIGEST


       This  command imports the current directory into the system-wide shared
       Zero Install cache, as  /var/cache/
       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.


       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:

       mkdir /var/cache/

       chown zeroinst /var/cache/

       Use visudo(8) to add these lines to /etc/sudoers:

       Defaults>zeroinst env_reset,always_set_home

       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
       it automatically.

       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: