* `nix --restore' command.

This commit is contained in:
Eelco Dolstra 2003-06-23 14:08:34 +00:00
parent 5f5cab0ac7
commit c0cbaef4be

View file

@ -26,9 +26,13 @@ static ArgType argType = atpUnknown;
--delete / -d: delete values
--query / -q: query stored values
--add: add values
--verify: verify Nix structures
--dump: dump a file or value
--dump: dump a value as a Nix archive
--restore: restore a value from a Nix archive
--init: initialise the Nix database
--verify: verify Nix structures
--version: output version information
--help: display help
@ -132,14 +136,14 @@ struct StdoutSink : DumpSink
virtual void operator ()
(const unsigned char * data, unsigned int len)
{
/* Don't use cout, it's slow as hell! */
if (write(STDOUT_FILENO, (char *) data, len) != len)
if (write(STDOUT_FILENO, (char *) data, len) != (ssize_t) len)
throw SysError("writing to stdout");
}
};
/* Dump a value to standard output */
/* Dump a value as a Nix archive. The archive is written to standard
output. */
static void opDump(Strings opFlags, Strings opArgs)
{
getArgType(opFlags);
@ -157,7 +161,33 @@ static void opDump(Strings opFlags, Strings opArgs)
else if (argType == atpPath)
path = arg;
dumpPath(*opArgs.begin(), sink);
dumpPath(path, sink);
}
/* A source that read restore intput to stdin. */
struct StdinSource : RestoreSource
{
virtual void operator () (const unsigned char * data, unsigned int len)
{
ssize_t res = read(STDIN_FILENO, (char *) data, len);
if (res == -1)
throw SysError("reading from stdin");
if (res != (ssize_t) len)
throw Error("not enough data available on stdin");
}
};
/* Restore a value from a Nix archive. The archive is written to
standard input. */
static void opRestore(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() != 1) throw UsageError("only one argument allowed");
StdinSource source;
restorePath(*opArgs.begin(), source);
}
@ -219,6 +249,8 @@ void run(int argc, char * * argv)
op = opAdd;
else if (arg == "--dump")
op = opDump;
else if (arg == "--restore")
op = opRestore;
else if (arg == "--init")
op = opInit;
else if (arg[0] == '-')