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* sockaddr_un doesn't allow path names of more than 108 characters.

Browse source 
This isn't usually a problem, except that it causes tests to fail
  when performed in a directory with a very long path name.  So chdir
  to the socket directory and use a relative path name.
This commit is contained in:
Eelco Dolstra 2008-04-09 05:57:01 +00:00
parent f8985d195e
commit 72034ab35d
2 changed files with 26 additions and 6 deletions
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18
src/libstore/remote-store.cc
View file

@ -137,14 +137,26 @@ void RemoteStore::connectToDaemon()
string socketPath = nixStateDir + DEFAULT_SOCKET_PATH;
/* Urgh, sockaddr_un allows path names of only 108 characters. So
chdir to the socket directory so that we can pass a relative
path name. !!! this is probably a bad idea in multi-threaded
applications... */
AutoCloseFD fdPrevDir = open(".", O_RDONLY);
if (fdPrevDir == -1) throw SysError("couldn't open current directory");
chdir(dirOf(socketPath).c_str());
Path socketPathRel = "./" + baseNameOf(socketPath);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
if (socketPath.size() >= sizeof(addr.sun_path))
throw Error(format("socket path `%1%' is too long") % socketPath);
strcpy(addr.sun_path, socketPath.c_str());
if (socketPathRel.size() >= sizeof(addr.sun_path))
throw Error(format("socket path `%1%' is too long") % socketPathRel);
strcpy(addr.sun_path, socketPathRel.c_str());
if (connect(fdSocket, (struct sockaddr *) &addr, sizeof(addr)) == -1)
throw SysError(format("cannot connect to daemon at `%1%'") % socketPath);
if (fchdir(fdPrevDir) == -1)
throw SysError("couldn't change back to previous directory");
}

14
src/nix-worker/nix-worker.cc
View file

@ -542,11 +542,17 @@ static void daemonLoop()
createDirs(dirOf(socketPath));
/* Urgh, sockaddr_un allows path names of only 108 characters. So
chdir to the socket directory so that we can pass a relative
path name. */
chdir(dirOf(socketPath).c_str());
Path socketPathRel = "./" + baseNameOf(socketPath);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
if (socketPath.size() >= sizeof(addr.sun_path))
throw Error(format("socket path `%1%' is too long") % socketPath);
strcpy(addr.sun_path, socketPath.c_str());
if (socketPathRel.size() >= sizeof(addr.sun_path))
throw Error(format("socket path `%1%' is too long") % socketPathRel);
strcpy(addr.sun_path, socketPathRel.c_str());
unlink(socketPath.c_str());
@ -559,6 +565,8 @@ static void daemonLoop()
if (res == -1)
throw SysError(format("cannot bind to socket `%1%'") % socketPath);
chdir("/"); /* back to the root */
if (listen(fdSocket, 5) == -1)
throw SysError(format("cannot listen on socket `%1%'") % socketPath);