diff options
author | Eelco Dolstra <edolstra@gmail.com> | 2019-06-17T07·57+0200 |
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committer | Eelco Dolstra <edolstra@gmail.com> | 2019-06-25T10·45+0200 |
commit | 09dde33c19129b949a064d35e248a3e318178b08 (patch) | |
tree | e0158028616c7f27869700b68b29ecde270e7399 /src/nix/main.cc | |
parent | 5600b070a766b83200a68d3632793917cf19a550 (diff) |
Automatically use --no-net if there are no network interfaces
(cherry picked from commit 04a59769963fe2a28d10ba15de743fe499333c80)
Diffstat (limited to 'src/nix/main.cc')
-rw-r--r-- | src/nix/main.cc | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/nix/main.cc b/src/nix/main.cc index 19bb7a543150..73c4b8db1123 100644 --- a/src/nix/main.cc +++ b/src/nix/main.cc @@ -8,19 +8,52 @@ #include "shared.hh" #include "store-api.hh" #include "progress-bar.hh" +#include "download.hh" #include "finally.hh" +#include <sys/types.h> +#include <sys/socket.h> +#include <ifaddrs.h> +#include <netdb.h> + extern std::string chrootHelperName; void chrootHelper(int argc, char * * argv); namespace nix { +/* Check if we have a non-loopback/link-local network interface. */ +static bool haveInternet() +{ + struct ifaddrs * addrs; + + if (getifaddrs(&addrs)) + return true; + + Finally free([&]() { freeifaddrs(addrs); }); + + for (auto i = addrs; i; i = i->ifa_next) { + if (!i->ifa_addr) continue; + if (i->ifa_addr->sa_family == AF_INET) { + if (ntohl(((sockaddr_in *) i->ifa_addr)->sin_addr.s_addr) != INADDR_LOOPBACK) { + return true; + } + } else if (i->ifa_addr->sa_family == AF_INET6) { + if (!IN6_IS_ADDR_LOOPBACK(((sockaddr_in6 *) i->ifa_addr)->sin6_addr.s6_addr) && + !IN6_IS_ADDR_LINKLOCAL(((sockaddr_in6 *) i->ifa_addr)->sin6_addr.s6_addr)) + return true; + } + } + + return false; +} + std::string programPath; struct NixArgs : virtual MultiCommand, virtual MixCommonArgs { bool printBuildLogs = false; + bool useNet = true; NixArgs() : MultiCommand(*RegisterCommand::commands), MixCommonArgs("nix") { @@ -53,6 +86,11 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs .longName("version") .description("show version information") .handler([&]() { printVersion(programName); }); + + mkFlag() + .longName("no-net") + .description("disable substituters and consider all previously downloaded files up-to-date") + .handler([&]() { useNet = false; }); } void printFlags(std::ostream & out) override @@ -108,6 +146,23 @@ void mainWrapped(int argc, char * * argv) startProgressBar(args.printBuildLogs); + if (args.useNet && !haveInternet()) { + warn("you don't have Internet access; disabling some network-dependent features"); + args.useNet = false; + } + + if (!args.useNet) { + // FIXME: should check for command line overrides only. + if (!settings.useSubstitutes.overriden) + settings.useSubstitutes = false; + if (!settings.tarballTtl.overriden) + settings.tarballTtl = std::numeric_limits<unsigned int>::max(); + if (!downloadSettings.tries.overriden) + downloadSettings.tries = 0; + if (!downloadSettings.connectTimeout.overriden) + downloadSettings.connectTimeout = 1; + } + args.command->prepare(); args.command->run(); } |