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Add download-via-ssh substituter

Browse source 
This substituter connects to a remote host, runs nix-store --serve
there, and then forwards substituter commands on to the remote host and
sends their results to the calling program. The ssh-substituter-hosts
option can be specified as a list of hosts to try.

This is an initial implementation and, while it works, it has some
limitations:

* Only the first host is used
* There is no caching of query results (all queries are sent to the
  remote machine)
* There is no informative output (such as progress bars)
* Some failure modes may cause unhelpful error messages
* There is no concept of trusted-ssh-substituter-hosts

Signed-off-by: Shea Levy <shea@shealevy.com>
This commit is contained in:
Shea Levy 2014-02-08 00:05:46 -05:00
parent 5671188eb2
commit 64e23d0a38
6 changed files with 168 additions and 0 deletions
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6
src/libstore/globals.hh
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@ -25,6 +25,8 @@ struct Settings {
string pack();
void unpack(string pack);
SettingsMap getOverrides();
/* The directory where we store sources and derived files. */
@ -144,6 +146,9 @@ struct Settings {
chroot. */
StringSet dirsInChroot;
/* Set of ssh connection strings for the ssh substituter */
Strings sshSubstituterHosts;
/* Whether to impersonate a Linux 2.6 machine on newer kernels. */
bool impersonateLinux26;
@ -195,6 +200,7 @@ private:
void get(string & res, const string & name);
void get(bool & res, const string & name);
void get(StringSet & res, const string & name);
void get(Strings & res, const string & name);
template<class N> void get(N & res, const string & name);
};