291 lines
7.2 KiB
C++
291 lines
7.2 KiB
C++
#include <iostream>
|
|
|
|
#include "globals.hh"
|
|
#include "store.hh"
|
|
#include "fstate.hh"
|
|
#include "archive.hh"
|
|
#include "shared.hh"
|
|
|
|
|
|
typedef void (* Operation) (Strings opFlags, Strings opArgs);
|
|
|
|
|
|
typedef enum { atpHash, atpPath, atpUnknown } ArgType;
|
|
|
|
static ArgType argType = atpUnknown;
|
|
|
|
|
|
/* Nix syntax:
|
|
|
|
nix [OPTIONS...] [ARGUMENTS...]
|
|
|
|
Operations:
|
|
|
|
--install / -i: realise an fstate
|
|
--delete / -d: delete paths from the Nix store
|
|
--add / -A: copy a path to the Nix store
|
|
--query / -q: query information
|
|
|
|
--dump: dump a path as a Nix archive
|
|
--restore: restore a path from a Nix archive
|
|
|
|
--init: initialise the Nix database
|
|
--verify: verify Nix structures
|
|
|
|
--version: output version information
|
|
--help: display help
|
|
|
|
Source selection for --install, --dump:
|
|
|
|
--file / -f: by file name
|
|
--hash / -h: by hash
|
|
|
|
Query flags:
|
|
|
|
--path / -p: query the path of an fstate
|
|
--refs / -r: query paths referenced by an fstate
|
|
|
|
Options:
|
|
|
|
--verbose / -v: verbose operation
|
|
*/
|
|
|
|
|
|
/* Parse the `-f' / `-h' / flags, i.e., the type of arguments. These
|
|
flags are deleted from the referenced vector. */
|
|
static void getArgType(Strings & flags)
|
|
{
|
|
for (Strings::iterator it = flags.begin();
|
|
it != flags.end(); )
|
|
{
|
|
string arg = *it;
|
|
ArgType tp;
|
|
if (arg == "--hash" || arg == "-h") tp = atpHash;
|
|
else if (arg == "--file" || arg == "-f") tp = atpPath;
|
|
else { it++; continue; }
|
|
if (argType != atpUnknown)
|
|
throw UsageError("only one argument type specified may be specified");
|
|
argType = tp;
|
|
it = flags.erase(it);
|
|
}
|
|
if (argType == atpUnknown)
|
|
throw UsageError("argument type not specified");
|
|
}
|
|
|
|
|
|
static Hash argToHash(const string & arg)
|
|
{
|
|
if (argType == atpHash)
|
|
return parseHash(arg);
|
|
else if (argType == atpPath) {
|
|
string path;
|
|
Hash hash;
|
|
addToStore(arg, path, hash);
|
|
return hash;
|
|
}
|
|
else abort();
|
|
}
|
|
|
|
|
|
/* Realise (or install) paths from the given Nix fstate
|
|
expressions. */
|
|
static void opInstall(Strings opFlags, Strings opArgs)
|
|
{
|
|
getArgType(opFlags);
|
|
if (!opFlags.empty()) throw UsageError("unknown flag");
|
|
|
|
for (Strings::iterator it = opArgs.begin();
|
|
it != opArgs.end(); it++)
|
|
realiseFState(termFromHash(argToHash(*it)));
|
|
}
|
|
|
|
|
|
/* Delete a path in the Nix store directory. */
|
|
static void opDelete(Strings opFlags, Strings opArgs)
|
|
{
|
|
if (!opFlags.empty()) throw UsageError("unknown flag");
|
|
|
|
for (Strings::iterator it = opArgs.begin();
|
|
it != opArgs.end(); it++)
|
|
deleteFromStore(absPath(*it));
|
|
}
|
|
|
|
|
|
/* Add paths to the Nix values directory and print the hashes of those
|
|
paths. */
|
|
static void opAdd(Strings opFlags, Strings opArgs)
|
|
{
|
|
getArgType(opFlags);
|
|
if (!opFlags.empty()) throw UsageError("unknown flag");
|
|
|
|
for (Strings::iterator it = opArgs.begin();
|
|
it != opArgs.end(); it++)
|
|
{
|
|
string path;
|
|
Hash hash;
|
|
addToStore(*it, path, hash);
|
|
cout << format("%1% %2%\n") % (string) hash % path;
|
|
}
|
|
}
|
|
|
|
|
|
/* Perform various sorts of queries. */
|
|
static void opQuery(Strings opFlags, Strings opArgs)
|
|
{
|
|
enum { qPath, qRefs, qUnknown } query = qPath;
|
|
|
|
for (Strings::iterator it = opFlags.begin();
|
|
it != opFlags.end(); )
|
|
{
|
|
string arg = *it;
|
|
if (arg == "--path" || arg == "-p") query = qPath;
|
|
else if (arg == "--refs" || arg == "-r") query = qRefs;
|
|
else { it++; continue; }
|
|
it = opFlags.erase(it);
|
|
}
|
|
|
|
getArgType(opFlags);
|
|
if (!opFlags.empty()) throw UsageError("unknown flag");
|
|
|
|
for (Strings::iterator it = opArgs.begin();
|
|
it != opArgs.end(); it++)
|
|
{
|
|
Hash hash = argToHash(*it);
|
|
|
|
switch (query) {
|
|
|
|
case qPath:
|
|
cout << format("%s\n") %
|
|
(string) fstatePath(termFromHash(hash));
|
|
break;
|
|
|
|
case qRefs: {
|
|
Strings refs = fstateRefs(realiseFState(termFromHash(hash)));
|
|
for (Strings::iterator j = refs.begin();
|
|
j != refs.end(); j++)
|
|
cout << format("%s\n") % *j;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* A sink that writes dump output to stdout. */
|
|
struct StdoutSink : DumpSink
|
|
{
|
|
virtual void operator ()
|
|
(const unsigned char * data, unsigned int len)
|
|
{
|
|
if (write(STDOUT_FILENO, (char *) data, len) != (ssize_t) len)
|
|
throw SysError("writing to stdout");
|
|
}
|
|
};
|
|
|
|
|
|
/* Dump a path as a Nix archive. The archive is written to standard
|
|
output. */
|
|
static void opDump(Strings opFlags, Strings opArgs)
|
|
{
|
|
getArgType(opFlags);
|
|
if (!opFlags.empty()) throw UsageError("unknown flag");
|
|
if (opArgs.size() != 1) throw UsageError("only one argument allowed");
|
|
|
|
StdoutSink sink;
|
|
string arg = *opArgs.begin();
|
|
string path;
|
|
|
|
if (argType == atpHash)
|
|
path = queryPathByHash(parseHash(arg));
|
|
else if (argType == atpPath)
|
|
path = arg;
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/* Initialise the Nix databases. */
|
|
static void opInit(Strings opFlags, Strings opArgs)
|
|
{
|
|
if (!opFlags.empty()) throw UsageError("unknown flag");
|
|
if (!opArgs.empty())
|
|
throw UsageError("--init does not have arguments");
|
|
initDB();
|
|
}
|
|
|
|
|
|
/* Scan the arguments; find the operation, set global flags, put all
|
|
other flags in a list, and put all other arguments in another
|
|
list. */
|
|
void run(Strings args)
|
|
{
|
|
Strings opFlags, opArgs;
|
|
Operation op = 0;
|
|
|
|
for (Strings::iterator it = args.begin();
|
|
it != args.end(); it++)
|
|
{
|
|
string arg = *it;
|
|
|
|
Operation oldOp = op;
|
|
|
|
if (arg == "--install" || arg == "-i")
|
|
op = opInstall;
|
|
else if (arg == "--delete" || arg == "-d")
|
|
op = opDelete;
|
|
else if (arg == "--add" || arg == "-A")
|
|
op = opAdd;
|
|
else if (arg == "--query" || arg == "-q")
|
|
op = opQuery;
|
|
else if (arg == "--dump")
|
|
op = opDump;
|
|
else if (arg == "--restore")
|
|
op = opRestore;
|
|
else if (arg == "--init")
|
|
op = opInit;
|
|
else if (arg[0] == '-')
|
|
opFlags.push_back(arg);
|
|
else
|
|
opArgs.push_back(arg);
|
|
|
|
if (oldOp && oldOp != op)
|
|
throw UsageError("only one operation may be specified");
|
|
}
|
|
|
|
if (!op) throw UsageError("no operation specified");
|
|
|
|
op(opFlags, opArgs);
|
|
}
|
|
|
|
|
|
string programId = "nix";
|