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Duplicated tokens in close proximity takes too long for my head
to parse; and "dir" is an easy and common abbreviation for
"directory".
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There is only once update thread at a time. Make the "modified" flag
global and remove the return values of most functions. Propagating an
error is only useful for updateDirectory(), since updateInDirectory()
will delete failed subdirectories.
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When a song file was not modified, MPD printed the debug message "not
a directory or music", because the first "if" branch did not return.
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When the update queue is full, directory_update_init() did not free
the path argument.
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Since the return value cannot be -1 anymore, we can make it unsigned.
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The documentation for directory_update_init() was incorrect: a job ID
must be positive, not non-negative. If the update queue is full and
no job was created, it makes more sense to return 0 instead of -1,
because it is more consistent with the return value of isUpdatingDB().
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When the update task is idle, there is no need to check for deleted
songs. Return early from reap_update_task().
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pthread_join() expects a "pointer to a pointer" parameter, but it got
a "pointer to an enum". On AMD64, an enum is smaller than a pointer,
leading to a buffer overflow.
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Removed the local variable "was_empty": don't remember if the
directory is new. Always call removeDeletedFromDirectory().
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In updateInDirectory(), add new directories immediately and
delete them when they turn out to be empty. This simplifies the code
and allows us to eliminate addSubDirectoryToDirectory().
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The recursive checks were performed in several functions, and
sometimes a directory was checked twice.
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When reading a new directory, copy the stat data (which we have
anyway) to the directory struct. This may save a stat() in the
future.
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Pass a pointer to the stat struct to more functions.
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updatePath() duplicated a lot of code from the more generic
updateInDirectory(). Eliminate most of updatePath() and call
updateInDirectory().
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If the user requests database update during startup, call
directory_update_init(). This should be changed to fully asynchronous
update later.
For this to work, main_notify has to be initialized before db_init().
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The stat struct isn't going to be modified, make it const.
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update_task() already checks if it has got a root path. Extend this
check and in turn remove a check in the inner function updatePath().
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The algorithm in addDirectoryPathToDB() can be simplified further if
it is combined with the function addParentPathToDB(). Since there is
no other caller of addDirectoryPathToDB(), we can do that. This saves
another large stack buffer.
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This recursive function is very dangerous because it allocates a large
buffer on the stack in every iteration. That may be misused to
generate a stack overflow.
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When a directory cannot be updated, there must be something wrong with
it, and the database contains stale data. Remove it.
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The branching looks a bit complicated in addDirectoryPathToDB() -
improve its readability by moving code to a simplified separate
function.
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When the root directory fails to update, its contents are invalid.
Clear it then.
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When a directory failed to update, it was removed from the database,
without freeing all children and songs (memory leak), and without
locking (race condition). Introduce the functions clear_directory()
and delete_directory(), which do both.
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Use updateInDirectory() instead of addToDirectory(). Eliminate a
duplicate stat() in updateInDirectory() by calling song_file_update()
directly.
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Don't use db_get_directory() and traverse the full path with every
directory being loaded. Just see if the current parent contains the
entry. Everything else would be invalid anyway..
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A manipulated database could trigger an assertion failure, because the
parent didn't match. Do a proper check if the new directory is within
the parent's. This uses FATAL() to bail out, so MPD still dies, but
it doesn't crash.
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Some tiny utilities... wrappers like these may become helpful when we
introduce locking.
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dirvec_find() does not modify the object, thus it should get a const
pointer.
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No idea why it was created in directory.h, but it should be in
dirvec.h.
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Remove clutter from directory.c. Everything which saves or loads
to/from the hard disk goes to directory_save.c, and code which sends
directory information to the client is moved into directory_print.c.
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Use sizeof(buffer) instead.
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Removed a superfluous closure.
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Commit 0bfe7802 broke update for new files in the root directory,
because music_root->path was an empty string and not NULL. There were
some NULL tests missing. Change them to !isRootDirectory(path)
instead of path!=NULL.
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For the root directory, let's set path to an empty string. This saves
a few checks.
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Also convert directory_get_path() to an inline function, which returns
a constant string.
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Pass const songvec pointers to songvec_find() and songvec_for_each().
[ew: already merged songvec_for_each() cosntification somewhere...]
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CamelCase is ugly, rename the functions.
[ew: "directory_get_directory" was too confusing, using
"directory_get_subdir" instead (old function was named
"getSubDirectory")]
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Yet another CamelCase removal patch.
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The same can be achieved with directory_print(db_get_directory()).
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Taming the directory.c monster, part II: move the database management
stuff to database. directory.c should only contain code which works
on directory objects.
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The function isRootDirectory() is tiny and can be converted to an
inline function. Don't allow name==NULL.
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Eliminate duplicated code.
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Instead of returning 0 or -1, return true on success and false on
failure. This seems more natural, and when the C library was
designed, there was no "bool" data type.
[ew:
changing to bool semantics but sticking with integer type
since bool is C99 and I don't require a C99 compiler,
and I don't feel like writing compatibility wrappers to
support it. _Bool is usually (always?) a signed int
anyways.
]
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This function was never used on remote songs. Replace the runtime
check with an assertion.
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CamelCase is ugly... rename all functions.
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Provide separate constructors for creating a remote song, a local
song, and one for loading data from a song file. This way, we can add
more assertions.
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Check the old status before assigning. This saves a temporary
variable.
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