Commit Graph

31 Commits

Author SHA1 Message Date
Michael Forney
f1c3fd4e44 Remove unnecessary initializers of recursor members 2020-06-23 02:20:41 -07:00
Michael Forney
edbcc223ea libutil/recurse: Use a single path buffer, and directory fd
This way, we don't use PATH_MAX bytes on the stack per path component,
and don't have to keep copying the complete path around.
2020-03-05 00:45:53 -08:00
sin
2f4ab52739 mv: Ensure stat is initialized when we prune a tree
This can happen if you move a file from one filesystem to another.
rename(2) will fail and we will fall through to a manual cp + rm.
Initiate the rm through recurse() like we do for rm(1).

Thanks to Heiko for reporting this.
2015-11-13 14:21:07 +00:00
sin
2366164de7 No need for semicolon after ARGEND
This is also the style used in Plan 9.
2015-11-01 10:18:55 +00:00
FRIGN
7b2465c101 Add maxdepth to recurse()
This also makes more sense.
2015-04-20 11:12:40 +01:00
FRIGN
e14d9412f8 Properly handle recursion in recurse()
The restructuring of recurse() in the last few weeks actually broke
the recursion-flags in different tools.
As a long-term goal, the recursor should have a field "maxdepth"
which should be "1" for the non-Rflag-case. "0" stands for unlimited.
2015-04-20 11:12:40 +01:00
FRIGN
58098575e7 Audit cp() in libutil
1) Rename cp_HLPflag -> cp_follow for consistency.
2) Use function-pointers for stat to clear up the code.
3) BUGFIX: TERMINATE THE RESULT BUFFER OF READLINK !!!
   It's something I noticed earlier and it actually lead to some
   pretty insane behaviour on our side using glibc (musl somehow
   magically solves this).
   Basically, symlinks used to contain the data of the file they
   pointed to. I wondered for weeks where this came from and now
   this has finally been solved.
4) BUGFIX: Do not unconditionally unlink target-files. Even GNU
   coreutils do it wrong.
   The basic idea is this:
   If fflag == 0 --> don't touch target files if they exist.
   If fflag == 1 --> unlink all and don't error out when we try
                     to unlink a file which doesn't exist.
5) Use estrlcpy and estrlcat instead of snprintf for path building.
6) Make it clearer what happens in preserve.
2015-03-19 17:57:12 +01:00
FRIGN
3111908b03 Refactor recurse() again
Okay, why yet another recurse()-refactor?
The last one added the recursor-struct, which simplified things
on the user-end, but there was still one thing that bugged me a lot:
Previously, all fn()'s were forced to (l)stat the paths themselves.
This does not work well when you try to keep up with H-, L- and P-
flags at the same time, as each utility-function would have to set
the right function-pointer for (l)stat every single time.

This is not desirable. Furthermore, recurse should be easy to use
and not involve trouble finding the right (l)stat-function to do it
right.
So, what we needed was a stat-argument for each fn(), so it is
directly accessible. This was impossible to do though when the
fn()'s are still directly called by the programs to "start" the
recurse.
Thus, the fundamental change is to make recurse() the function to
go, while designing the fn()'s in a way they can "live" with st
being NULL (we don't want a null-pointer-deref).

What you can see in this commit is the result of this work. Why
all this trouble instead of using nftw?
The special thing about recurse() is that you tell the function
when to recurse() in your fn(). You don't need special flags to
tell nftw() to skip the subtree, just to give an example.

The only single downside to this is that now, you are not allowed
to unconditionally call recurse() from your fn(). It has to be
a directory.
However, that is a cost I think is easily weighed up by the
advantages.

Another thing is the history: I added a procedure at the end of
the outmost recurse to free the history. This way we don't leak
memory.

A simple optimization on the side:

-		if (h->dev == st.st_dev && h->ino == st.st_ino)
+		if (h->ino == st.st_ino && h->dev == st.st_dev)

First compare the likely difference in inode-numbers instead of
checking the unlikely condition that the device-numbers are
different.
2015-03-19 01:08:19 +01:00
FRIGN
9fd4a745f8 Add history and config-struct to recurse
For loop detection, a history is mandatory. In the process of also
adding a flexible struct to recurse, the recurse-definition was moved
to fs.h.
The motivation behind the struct is to allow easy extensions to the
recurse-function without having to change the prototypes of all
functions in the process.
Adding flags is really simple as well now.

Using the recursor-struct, it's also easier to see which defaults
apply to a program (for instance, which type of follow, ...).

Another change was to add proper stat-lstat-usage in recurse. It
was wrong before.
2015-03-13 00:29:48 +01:00
FRIGN
01de5df8e6 Audit du(1) and refactor recurse()
While auditing du(1) I realized that there's no way the over 100 lines
of procedures in du() would pass the audit.
Instead, I decided to rewrite this section using recurse() from libutil.
However, the issue was that you'd need some kind of payload to count
the number of bytes in the subdirectories and use them in the higher
hierarchies.
The solution is to add a "void *data" data pointer to each recurse-
function-prototype, which we might also be able to use in other
recurse-applications.
recurse() itself had to be augmented with a recurse_samedev-flag, which
basically prevents recurse from leaving the current device.

Now, let's take a closer look at the audit:
1) Removing the now unnecessary util-functions push, pop, xrealpath,
   rename print() to printpath(), localize some global variables.
2) Only pass the block count to nblks instead of the entire stat-
   pointer.
3) Fix estrtonum to use the minimum of LLONG_MAX and SIZE_MAX.
4) Use idiomatic argv+argc-loop
5) Report proper exit-status.
2015-03-11 23:21:52 +01:00
FRIGN
109f6b5a60 Audit mv(1)
1) Make argument-naming consistent with other tools (cp(1), ...)
2) style fixes
3) usage() fix
4) BUGFIX: Probably from the old non-arg.h days, the directory-
   check was only done when argc > 3, but with arg.h, this ignores
   the case when 3 arguments were given.
   This is actually a pretty serious issue and I'm glad it's fixed.
5) Moreover, be more verbose when stat() fails and make it clearer
   what the hell is going on at this checkpoint.
2015-03-04 23:22:43 +01:00
FRIGN
8dc92fbd6c Refactor enmasse() and recurse() to reflect depth
The HLP-changes to sbase have been a great addition of functionality,
but they kind of "polluted" the enmasse() and recurse() prototypes.
As this will come in handy in the future, knowing at which "depth"
you are inside a recursing function is an important functionality.

Instead of having a special HLP-flag passed to enmasse, each sub-
function needs to provide it on its own and can calculate results
based on the current depth (for instance, 'H' implies 'P' at
depth > 0).
A special case is recurse(), because it actually depends on the
follow-type. A new flag "recurse_follow" brings consistency into
what used to be spread across different naming conventions (fflag,
HLP_flag, ...).

This also fixes numerous bugs with the behaviour of HLP in the
tools using it.
2015-03-02 22:50:38 +01:00
sin
0e008fe349 mv: Remove -i from usage and manpage 2015-02-19 14:56:02 +00:00
sin
8f068589fb Fix recurse() prototype and convert char to int flags 2015-02-16 16:23:12 +00:00
FRIGN
31572c8b0e Clean up #includes 2015-02-14 21:12:23 +01:00
Tai Chi Minh Ralph Eastwood
af8be7f92c cp: add symlink deref flags -H and -L for cp and mv 2015-02-09 22:54:52 +00:00
sin
737d23092a Staticise mv_status 2015-01-30 11:48:33 +00:00
FRIGN
e60885699c Fix return values in rm(1) and mv(1)
by setting rm_status to 1 if removing 1 file in the list fails.
Extend this to mv_status in mv(1).
2015-01-30 12:45:54 +01:00
FRIGN
2733fc7249 Rectify order of cases 2015-01-28 22:11:50 +01:00
FRIGN
7437901098 Add mandoc-manpage for mv(1)
and mark it as finished in README.
Make it clear that -i has not been implemented yet and drop the
flag in the code instead of erroring out.
2015-01-28 22:06:50 +01:00
FRIGN
ec8246bbc6 Un-boolify sbase
It actually makes the binaries smaller, the code easier to read
(gems like "val == true", "val == false" are gone) and actually
predictable in the sense of that we actually know what we're
working with (one bitwise operator was quite adventurous and
should now be fixed).

This is also more consistent with the other suckless projects
around which don't use boolean types.
2014-11-14 10:54:20 +00:00
FRIGN
7d2683ddf2 Sort includes and more cleanup and fixes in util/ 2014-11-14 10:54:10 +00:00
FRIGN
eee98ed3a4 Fix coding style
It was about damn time. Consistency is very important in such a
big codebase.
2014-11-13 18:08:43 +00:00
sin
0c5b7b9155 Stop using EXIT_{SUCCESS,FAILURE} 2014-10-02 23:46:59 +01:00
Hiltjo Posthuma
953ebf3573 code style
Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
2014-06-01 18:02:30 +01:00
sin
b5a511dacf Exit with EXIT_SUCCESS/EXIT_FAILURE instead of 0 and 1
Fixed for consistency purposes.
2013-10-07 16:44:22 +01:00
sin
82bff35228 Support -f for mv
At the moment this does nothing as we do not check anyway.
2013-10-05 13:51:45 +01:00
sin
428cd4fe84 None of these work without the proper # of arguments so print usage 2013-10-05 13:51:45 +01:00
stateless
7216a53a7e Remove unnecessary exit(1) in usage()
Signed-off-by: Christoph Lohmann <20h@r-36.net>
2013-06-19 19:58:19 +02:00
Christoph Lohmann
4d38f60685 Eliminating the getopt disgrace. 2013-06-14 20:20:47 +02:00
William Haddon
cec53d14b1 implement cp and mv and improve rm 2012-01-30 22:41:33 +00:00