source: MondoRescue/branches/stable/mindi-busybox/TODO @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 12 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 14.0 KB
Line 
1Busybox TODO
2
3Stuff that needs to be done.  This is organized by who plans to get around to
4doing it eventually, but that doesn't mean they "own" the item.  If you want to
5do one of these bounce an email off the person it's listed under to see if they
6have any suggestions how they plan to go about it, and to minimize conflicts
7between your work and theirs.  But otherwise, all of these are fair game.
8
9Rob Landley <rob@landley.net>:
10  Add BB_NOMMU to platform.h and migrate __uClinux__ tests to that.
11    #if defined __UCLIBC__ && !defined __ARCH_USE_MMU__
12  Add a libbb/platform.c
13    Implement fdprintf() for platforms that haven't got one.
14    Implement bb_realpath() that can handle NULL on non-glibc.
15    Cleanup bb_asprintf()
16
17  Migrate calloc() and bb_calloc() occurrences to bb_xzalloc().
18  Remove obsolete _() wrapper crud for internationalization we don't do.
19  Figure out where we need utf8 support, and add it.
20
21  sh
22    The command shell situation is a big mess.  We have three or four different
23    shells that don't really share any code, and the "standalone shell" doesn't
24    work all that well (especially not in a chroot environment), due to apps not
25    being reentrant.  I'm writing a new shell (bbsh) to unify the various
26    shells and configurably add the minimal set of bash features people
27    actually use.  The hardest part is it has to configure down as small as
28    lash while providing lash's features.  The rest is easy in comparison.
29  bzip2
30    Compression-side support.
31  init
32    General cleanup (should use ENABLE_FEATURE_INIT_SYSLOG and ENABLE_FEATURE_INIT_DEBUG).
33  depmod
34    busybox lacks a way to update module deps when running from firmware without the
35    use of the depmod.pl (perl is to bloated for most embedded setups) and or orig
36    modutils. The orig depmod is rather pointless to have to add to a firmware image
37    in when we already have a insmod/rmmod and friends.
38  Unify base64 handling.
39    [done]
40  Do a SUSv3 audit
41    Look at the full Single Unix Specification version 3 (available online at
42    "http://www.opengroup.org/onlinepubs/009695399/nfindex.html") and
43    figure out which of our apps are compliant, and what we're missing that
44    we might actually care about.
45
46    Even better would be some kind of automated compliance test harness that
47    exercises each command line option and the various corner cases.
48  Internationalization
49    How much internationalization should we do?
50
51    The low hanging fruit is UTF-8 character set support.  We should do this.
52    (Vodz pointed out the shell's cmdedit as needing work here.  What else?)
53
54    We also have lots of hardwired english text messages.  Consolidating this
55    into some kind of message table not only makes translation easier, but
56    also allows us to consolidate redundant (or close) strings.
57
58    We probably don't want to be bloated with locale support.  (Not unless we
59    can cleanly export it from our underlying C library without having to
60    concern ourselves with it directly.  Perhaps a few specific things like a
61    config option for "date" are low hanging fruit here?)
62
63    What level should things happen at?  How much do we care about
64    internationalizing the text console when X11 and xterms are so much better
65    at it?  (There's some infrastructure here we don't implement: The
66    "unicode_start" and "unicode_stop" shell scripts need "vt-is-UTF8" and a
67    --unicode option to loadkeys.  That implies a real loadkeys/dumpkeys
68    implementation to replace loadkmap/dumpkmap.  Plus messing with console font
69    loading.  Is it worth it, or do we just say "use X"?)
70
71  Individual compilation of applets.
72    It would be nice if busybox had the option to compile to individual applets,
73    for people who want an alternate implementation less bloated than the gnu
74    utils (or simply with less political baggage), but without it being one big
75    executable.
76
77    Turning libbb into a real dll is another possibility, especially if libbb
78    could export some of the other library interfaces we've already more or less
79    got the code for (like zlib).
80  buildroot - Make a "dogfood" option
81    Busybox 1.1 will be capable of replacing most gnu packages for real world
82    use, such as developing software or in a live CD.  It needs wider testing.
83
84    Busybox should now be able to replace bzip2, coreutils, e2fsprogs, file,
85    findutils, gawk, grep, inetutils, less, modutils, net-tools, patch, procps,
86    sed, shadow, sysklogd, sysvinit, tar, util-linux, and vim.  The resulting
87    system should be self-hosting (I.E. able to rebuild itself from source
88    code).  This means it would need (at least) binutils, gcc, and make, or
89    equivalents.
90
91    It would be a good "eating our own dogfood" test if buildroot had the option
92    of using a "make allyesconfig" busybox instead of the all of the above
93    packages.  Anything that's wrong with the resulting system, we can fix.  (It
94    would be nice to be able to upgrade busybox to be able to replace bash and
95    diffutils as well, but we're not there yet.)
96
97    One example of an existing system that does this already is Firmware Linux:
98      http://www.landley.net/code/firmware
99  initramfs
100    Busybox should have a sample initramfs build script.  This depends on
101    bbsh, mdev, and switch_root.
102  mkdep
103    Write a mkdep that doesn't segfault if there's a directory it doesn't
104    have permission to read, isn't based on manually editing the output of
105    lexx and yacc, doesn't make such a mess under include/config, etc.
106  Group globals into unions of structures.
107    Go through and turn all the global and static variables into structures,
108    and have all those structures be in a big union shared between processes,
109    so busybox uses less bss.  (This is a big win on nommu machines.)  See
110    sed.c and mdev.c for examples.
111  Go through bugs.busybox.net and close out all of that somehow.
112    This one's open to everybody, but I'll wind up doing it...
113
114
115Bernhard Fischer <busybox@busybox.net> suggests to look at these:
116  New debug options:
117    -Wlarger-than-127
118    Cleanup any big users
119    -Wunused-parameter
120    Facilitate applet PROTOTYPES to provide means for having applets that
121    do a) not take any arguments b) need only one of argc or argv c) need
122    both argc and argv. All of these three options should go for the most
123    feature complete denominator.
124  Collate BUFSIZ IOBUF_SIZE MY_BUF_SIZE PIPE_PROGRESS_SIZE BUFSIZE PIPESIZE
125    make bb_common_bufsiz1 configurable, size wise.
126    make pipesize configurable, size wise.
127    Use bb_common_bufsiz1 throughout applets!
128
129As yet unclaimed:
130
131----
132find
133  doesn't understand (), lots of susv3 stuff.
134----
135diff
136  Make sure we handle empty files properly:
137    From the patch man page:
138
139    you can remove a file by sending out a context diff that compares
140    the file to be deleted with an empty file dated the Epoch.  The
141    file will be removed unless patch is conforming to POSIX and the
142    -E or --remove-empty-files option is not given.
143---
144patch
145  Should have simple fuzz factor support to apply patches at an offset which
146  shouldn't take up too much space.
147
148  And while we're at it, a new patch filename quoting format is apparently
149  coming soon:  http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
150---
151ps / top
152  Add support for both RSS and VSIZE rather than just one or the other.
153  Or make it a build option.
154---
155man
156  It would be nice to have a man command.  Not one that handles troff or
157  anything, just one that can handle preformatted ascii man pages, possibly
158  compressed.  This could probably be a script in the extras directory that
159  calls cat/zcat/bzcat | less
160
161  (How doclifter might work into this is anybody's guess.)
162---
163ar
164  Write support?
165---
166stty / catv
167  stty's visible() function and catv's guts are identical. Merge them into
168  an appropriate libbb function.
169---
170struct suffix_mult
171  Several duplicate users of: grep -r "1024\*1024" * -B2 -A1
172  Merge to a single size_suffixes[] in libbb.
173  Users: head tail od_bloaty hexdump and (partially as it wouldn't hurt) svlogd
174---
175tail
176  ./busybox tail -f foo.c~ TODO
177  should not print fmt=header_fmt for subsequent date >> TODO; i.e. only
178  fmt+ if another (not the current) file did change
179
180Architectural issues:
181
182bb_close() with fsync()
183  We should have a bb_close() in place of normal close, with a CONFIG_ option
184  to not just check the return value of close() for an error, but fsync().
185  Close can't reliably report anything useful because if write() accepted the
186  data then it either went out to the network or it's in cache or a pipe
187  buffer.  Either way, there's no guarantee it'll make it to its final
188  destination before close() gets called, so there's no guarantee that any
189  error will be reported.
190
191  You need to call fsync() if you care about errors that occur after write(),
192  but that can have a big performance impact.  So make it a config option.
193---
194Unify archivers
195  Lots of archivers have the same general infrastructure.  The directory
196  traversal code should be factored out, and the guts of each archiver could
197  be some setup code and a series of callbacks for "add this file",
198  "add this directory", "add this symlink" and so on.
199
200  This could clean up tar and zip, and make it cheaper to add cpio and ar
201  write support, and possibly even cheaply add things like mkisofs or
202  mksquashfs someday, if they become relevant.
203---
204Text buffer support.
205  Several existing applets (sort, vi, less...) read
206  a whole file into memory and act on it.  There might be an opportunity
207  for shared code in there that could be moved into libbb...
208---
209Memory Allocation
210  We have a CONFIG_BUFFER mechanism that lets us select whether to do memory
211  allocation on the stack or the heap.  Unfortunately, we're not using it much.
212  We need to audit our memory allocations and turn a lot of malloc/free calls
213  into RESERVE_CONFIG_BUFFER/RELEASE_CONFIG_BUFFER.
214  For a start, see e.g. make EXTRA_CFLAGS=-Wlarger-than-64
215
216  And while we're at it, many of the CONFIG_FEATURE_CLEAN_UP #ifdefs will be
217  optimized out by the compiler in the stack allocation case (since there's no
218  free for an alloca()), and this means that various cleanup loops that just
219  call free might also be optimized out by the compiler if written right, so
220  we can yank those #ifdefs too, and generally clean up the code.
221---
222Switch CONFIG_SYMBOLS to ENABLE_SYMBOLS
223
224  In busybox 1.0 and earlier, configuration was done by CONFIG_SYMBOLS
225  that were either defined or undefined to indicate whether the symbol was
226  selected in the .config file.  They were used with #ifdefs, ala:
227
228    #ifdef CONFIG_SYMBOL
229      if (other_test) {
230        do_code();
231      }
232    #endif
233
234  In 1.1, we have new ENABLE_SYMBOLS which are always defined (as 0 or 1),
235  meaning you can still use them for preprocessor tests by replacing
236  "#ifdef CONFIG_SYMBOL" with "#if ENABLE_SYMBOL".  But more importantly, we
237  can use them as a true or false test in normal C code:
238
239    if (ENABLE_SYMBOL && other_test) {
240      do_code();
241    }
242
243  (Optimizing away if() statements that resolve to a constant value
244  is known as "dead code elimination", an optimization so old and simple that
245  Turbo Pascal for DOS did it twenty years ago.  Even modern mini-compilers
246  like the Tiny C Compiler (tcc) and the Small Device C Compiler (SDCC)
247  perform dead code elimination.)
248
249  Right now, busybox.h is #including both "config.h" (defining the
250  CONFIG_SYMBOLS) and "bb_config.h" (defining the ENABLE_SYMBOLS).  At some
251  point in the future, it would be nice to wean ourselves off of the
252  CONFIG versions.  (Among other things, some defective build environments
253  leak the Linux kernel's CONFIG_SYMBOLS into the system's standard #include
254  files.  We've experienced collisions before.)
255---
256FEATURE_CLEAN_UP
257  This is more an unresolved issue than a to-do item.  More thought is needed.
258
259  Normally we rely on exit() to free memory, close files, and unmap segments
260  for us.  This makes most calls to free(), close(), and unmap() optional in
261  busybox applets that don't intend to run for very long, and optional stuff
262  can be omitted to save size.
263
264  The idea was raised that we could simulate fork/exit with setjmp/longjmp
265  for _really_ brainless embedded systems, or speed up the standalone shell
266  by not forking.  Doing so would require a reliable FEATURE_CLEAN_UP.
267  Unfortunately, this isn't as easy as it sounds.
268
269  The problem is, lots of things exit(), sometimes unexpectedly (xmalloc())
270  and sometimes reliably (bb_perror_msg_and_die() or show_usage()).  This
271  jumps out of the normal flow control and bypasses any cleanup code we
272  put at the end of our applets.
273
274  It's possible to add hooks to libbb functions like xmalloc() and xopen()
275  to add their entries to a linked list, which could be traversed and
276  freed/closed automatically.  (This would need to be able to free just the
277  entries after a checkpoint to be usable for a forkless standalone shell.
278  You don't want to free the shell's own resources.)
279
280  Right now, FEATURE_CLEAN_UP is more or less a debugging aid, to make things
281  like valgrind happy.  It's also documentation of _what_ we're trusting
282  exit() to clean up for us.  But new infrastructure to auto-free stuff would
283  render the existing FEATURE_CLEAN_UP code redundant.
284
285  For right now, exit() handles it just fine.
286
287
288
289Minor stuff:
290  watchdog.c could autodetect the timer duration via:
291    if(!ioctl (fd, WDIOC_GETTIMEOUT, &tmo)) timer_duration = 1 + (tmo / 2);
292  Unfortunately, that needs linux/watchdog.h and that contains unfiltered
293  kernel types on some distros, which breaks the build.
294---
295  use bb_error_msg where appropriate: See
296  egrep "(printf.*\([[:space:]]*(stderr|2)|[^_]write.*\([[:space:]]*(stderr|2))"
297---
298  use bb_perror_msg where appropriate: See
299  egrep "[^_]perror"
300---
301  Remove superfluous fmt occurances: e.g.
302  fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
303  -> fprintf(stderr, "unalias: %s not found\n", *argptr);
304---
305  possible code duplication ingroup() and is_a_group_member()
306---
307  Move __get_hz() to a better place and (re)use it in route.c, ash.c, msh.c
308---
309
310
311Code cleanup:
312
313Replace deprecated functions.
314
315bzero() -> memset()
316---
317sigblock(), siggetmask(), sigsetmask(), sigmask() -> sigprocmask et al
318---
319vdprintf() -> similar sized functionality
320---
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