Annotation of wikisrc/tracking_current.mdwn, revision 1.1
1.1 ! jdf 1: # Tracking NetBSD-current
! 3: **Contents**
! 5: [[!toc levels=2]]
! 7: ## Why track NetBSD-current?
! 9: The developers of NetBSD have made the current development sources
! 10: available to the public for several reasons. Overall, providing
! 11: NetBSD-current helps us to create a more stable, accessible system.
! 13: It makes it easier for people to become involved in the development of
! 14: NetBSD. Distributing the current development sources allows a greater
! 15: number of people to see where the system is going, and to become
! 16: involved with new features as they are implemented.
! 18: It also makes changes from users easier to integrate. If users make
! 19: changes against the current development sources, then virtually no
! 20: integration is needed to get them into the master source tree.
! 22: It also allows wider testing of the software as it is developed. Users
! 23: of NetBSD-current are encouraged to send in
! 24: [bug reports](http://netbsd.org/support/send-pr.html) about the current sources,
! 25: and that helps find and fix bugs. Because people are testing the software soon
! 26: after it's written, more bugs can be found and eliminated.
! 28: ## Things you need to remember
! 30: * People using NetBSD-current are strongly encouraged to subscribe to
! 31: the [current-users](http://netbsd.org/mailinglists/#current-users) mailing
! 32: list. The [source-changes](http://netbsd.org/mailinglists/#source-changes)
! 33: mailing list is also of interest.
! 35: # XXX
! 36: * When upgrading to a more recent version of -current you should
! 37: *always* install and boot a new kernel before installing any new
! 38: libs ([[http://netbsd.org/docs/current/index.html#star|*]]). In general the best approach is to try the new
! 39: kernel before anything else, and if you hit any problems see the
! 40: entry in the [[http://netbsd.org/docs/kernel/#problems_compiling_a_current_kernel|Kernel FAQ]].
! 42: * When compiling a -current kernel, always remember to include the
! 43: `COMPAT_<lastrelease>` option (e.g., `COMPAT_16`). As current diverges from
! 44: the last s"table release, compatibility code will be added, but it will only
! 45: be enabled if this option is present. At a bare minimum, you will need this
! 46: compatibility code for the time between booting the new kernel and finishing
! 47: your build via `build.sh`
! 49: # XXX
! 50: \*: Unless you are certain there have been no new system calls added,
! 51: but do it anyway; it's safer.
! 53: ## Updating an existing system from a current snapshot
! 55: *Please remember to check
! 56: [src/UPDATING](http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/UPDATING) for
! 57: quirks around certain specific changes.*
! 59: To quickly begin using current, start with a snapshot generated by release
! 60: engineering. The current status of each platform can be seen at
! 61: [NetBSD Autobuild](http://releng.NetBSD.org/cgi-bin/builds.cgi) and the
! 62: corresponding releases found in by date and platform.
! 64: 1. Hunt down to the desired `binary/sets` directory, and `mget *.tgz` files
! 65: into your favorite local administrative directory (for example,
! 66: `$HOME/current`); when limited by disk space and/or time, only
! 67: `kern-GENERIC`, `etc`, `base`, and `comp` (if you want a compiler) are
! 68: essential.
! 69: 2. Extract the desired kernel (usually `GENERIC`), copy it into (root) directory.
! 71: # cd /root
! 72: # tar -zxpf ~/kern-GENERIC.tgz
! 73: # ln -fh /netbsd /netbsd.old
! 74: # cp netbsd /netbsd.new
! 75: # ln -fh /netbsd.new /netbsd
! 77: > **Warning**: Don't extract any userland binary sets before rebooting your
! 78: > machine with the new kernel. Newer binaries might use new system calls an
! 79: > old running kernel doesn't support.
! 81: 3. Check if there are any other files which might also be required by a new
! 82: kernel. Again,
! 83: [src/UPDATING](http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/UPDATING)
! 84: might mention possible quirks on daily changes.
! 86: The following items are typical files that possibly need to be updated:
! 88: 1. bootloader
! 90: Usually a machine specific bootloader passes several parameters to a
! 91: loaded kernel. If some new parameters have been added or some existing
! 92: APIs between bootloader and kernel are changed you might also have to
! 93: install new bootloader files for a new kernel to handle new features. A
! 94: method to update bootloader files is quite machine dependent, so check
! 95: boot(8) and installboot(8) man pages for details.
! 98: On i386 and amd64, if you are using FFSv1 for root file system on `wd0a`
! 99: (i.e. first ATA drive), typical commands to update bootloaders are:
! 101: # tar -C /tmp -zxf ~/base.tgz ./usr/mdec
! 102: # cp /tmp/usr/mdec/boot /
! 103: # installboot -v /dev/rwd0a /tmp/usr/mdec/bootxx_ffsv1
! 105: If you are using FFSv2 for root file system use the following commands
! 106: instead:
! 108: # tar -C /tmp -zxf ~/base.tgz ./usr/mdec
! 109: # cp /tmp/usr/mdec/boot /
! 110: # installboot -v /dev/rwd0a /tmp/usr/mdec/bootxx_ffsv2
! 112: Note `/usr/mdec/bootxx_ffsv1` and `/usr/mdec/bootxx_ffsv2` are primary
! 113: bootloaders which are file system dependent. `/usr/mdec/boot` is
! 114: secondary loader and it's file system independenet.
! 116: If you forget your root file system type (FFSv1 or FFSv2), you can check
! 117: it by dumpfs(8) command:
! 119: # dumpfs /dev/rwd0a | head -3
! 120: file system: /dev/rwd0a
! 121: format FFSv2
! 122: endian little-endian
! 124: 2. kernel modules
! 126: A new framework *kernel modules* has been introduced after netbsd-5 was
! 127: branched, and `GENERIC` kernel on i386 port has been switched to using
! 128: the kernel module files since November 2008. The kernel module files
! 129: will be loaded dynamically by the kernel to support various kernel
! 130: options (including file systems) on demand, rather than linking all
! 131: necessary (but possibly unused) object files into the kernel binary.
! 132: This means if you are trying to boot a new `GENERIC` kernel, you also
! 133: have to prepare new kernel module files for the new kernel.
! 135: To prepare new kernel module files, you can simply use a new `modules`
! 136: set file which has been prepared since September 2009:
! 138: # cd /
! 139: # tar -zxpf ~/modules.tgz
! 141: Note i386 port also provides `MONOLITHIC` kernel binary in
! 142: `kern-MONOLITHIC.tgz` set file since October 2009. The `MONOLITHIC`
! 143: kernel includes all necessary options in its kernel as well as 5.0 and
! 144: prior `GENERIC` kernels and it doesn't depend on kernel module files at
! 145: all. If you would just like to test new features of a new kernel without
! 146: updating kernel modules, using `MONOLITHIC` kernel is easier way for the
! 147: first and quick trial.
! 149: It's also a good idea to put an old `MONOLITHIC` kernel into `/` (root)
! 150: directory for emergency and recovery because if newer modules have some
! 151: fatal issue there is no easy way to specify an alternative path of old
! 152: module files to a modular'ized kernel (and you can't rename directories
! 153: without a working kernel).
! 155: **Warning**: The infrastructure of kernel module files mentioned here is
! 156: still under discussion on -current development. It could be changed at
! 157: some point before the next 6.0 release and in that case the description
! 158: in this section will be obsolete. Again, check
! 159: [src/UPDATING](http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/UPDATING)
! 160: and
! 161: [currenet-users mailing list](http://mail-index.netbsd.org/current-users/)
! 162: for updated information.
! 164: There is
! 165: [a possible alternative structure for kernel modules](http://mail-index.netbsd.org/current-users/2009/05/10/msg009372.html)
! 166: which was proposed on May 2009, but we have not got any conclusion yet.
! 167: This would be because most -current users build their own custom kernels
! 168: from sources, but kernel modules might be rather useful for users who
! 169: don't want to bother to compile their own kernels from sources to just
! 170: try to use optinal functions. Anyway, any feedback about this brandnew
! 171: kernel modules is quite appreciated.
! 173: 4. Reboot machine with the new kernel:
! 175: # shutdown -r now
! 177: 5. Make sure the new kernel boots and works properly. If your new kernel has
! 178: any trouble, you can recover it by loading the renamed old one. If you are
! 179: using modular'ized GENERIC kernel mentioned above, you might also have to
! 180: restore old kernel module files.
! 182: 6. Extract the matching base, and any other desirable feature sets **except
! 183: etc**:
! 185: # cd /
! 186: # tar -zxpf ~/base.tgz
! 187: # tar -zxpf ~/comp.tgz
! 188: # ...
! 191: Don't forget to specify "p" option (preserve permissions) on tar(1) command
! 192: otherwise setuid'ed commands (like su(1)) won't work.
! 194: **Warning**: Extracting `etc.tgz` on the installed system will overwrite your
! 195: local settings.
! 197: 7. [Update](http://netbsd.org/docs/current/index.html#etcupdate) `/etc` as the
! 198: last step: postinstall(8) will first check and fix most things that can be
! 199: automated, and etcupdate(8) in the second step will ask on what to merge:
! 201: # /usr/sbin/postinstall -s ~/etc.tgz check
! 202: # /usr/sbin/postinstall -s ~/etc.tgz fix
! 203: # /usr/sbin/etcupdate -s ~/etc.tgz
! 204: # shutdown -r now
! 206: If you have the X sets installed (xbase, ...), you can repeat the
! 207: postinstall and etcupdate steps with xetc.tgz as argument before rebooting.
! 209: At this point, you are relatively current and ready to build your own current
! 210: source.
! 212: ## Downloading current source
! 214: See the [Obtaining the sources](http://netbsd.org/docs/guide/en/chap-fetch.html)
! 215: section in the [[NetBSD Guide|guide/index]].
! 217: ## Building a release from source
! 219: See the [Crosscompiling NetBSD](http://netbsd.org/docs/guide/en/chap-build.html)
! 220: section in the [[NetBSD Guide|guide/index]].
! 222: ## Updating an existing system from source
! 224: See the [[Updating an existing system from sources|guide/updating]] section in
! 225: the [[NetBSD Guide|guide/index]].
! 227: ## Updating the configuration and startup files
! 229: # XXX
! 230: See the [[http://netbsd.org/docs/guide/en/chap-updating.html#updating-etcupdate|More details about the updating of configuration and startup files]] section in the [[http://netbsd.org/docs/guide/en/|NetBSD Guide]].
! 232: ## What if I get an error?
! 234: If you try to build -current, either from a snapshot or an earlier -current, and
! 235: it doesn't work, don't panic. Try these steps:
! 237: 1. Read the
! 238: [src/UPDATING](http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/UPDATING)
! 239: file from the release you're trying to build.
! 241: 2. Read the [current-users archive](http://mail-index.netbsd.org/current-users/)
! 242: for hints.
! 244: 3. Update again. You may have caught the repository in the middle of a commit
! 245: to several related files, or the problem might have already been fixed.
! 247: 4. If all else fails, send email to current-users explaining the problem.
! 248: Include the date, time, and method you used to get your -current sources, as
! 249: well as any local changes you've made. Then put in a **short** script that
! 250: includes the error messages you're getting. Somebody will probably fix the
! 251: problem momentarily.
! 253: ## Tracking NetBSD-current with anoncvs
! 255: See the
! 256: [Fetching by CVS](http://netbsd.org/docs/guide/en/chap-fetch.html#chap-fetch-cvs)
! 257: section in the [[NetBSD Guide|guide/index]].
! 259: ### To check out the sources from a certain date
! 261: $ cvs checkout -D 20020501-UTC src
! 263: ### To check out the sources from a certain branch
! 265: $ cvs checkout -rnetbsd-5-0 src
! 267: See
! 268: [src/doc/BRANCHES](http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/doc/BRANCHES)
! 269: for a description of the branches in the CVS repository.
! 271: ### Useful hints
! 273: * Do not use the cvs `-z` flag. The data stream gets out of sync,
! 274: leading to corruption on the client, or causing the client to hang
! 275: completely. The additional load is also hard on the cvs server.
! 276: * If you want to check out a certain branch of the tree, you may want
! 277: to take caution not to overwrite any existing directories by
! 278: creating a new directory for this branch:
! 280: $ cd /parent/dir/to/checkout/into
! 281: $ mkdir NewName-temp
! 282: $ cd NewName-temp
! 283: $ cvs checkout ... src
! 284: $ mv src ../NewName
! 285: $ cd ..
! 286: $ rmdir NewName-temp
! 288: * You will have to use objdirs in order for cvs updates to work correctly. If
! 289: you happen to get errors from cvs saying things like:
! 291: cvs [update aborted]: could not chdir to gnu/usr.bin/gdb/gdb: Not a directory
! 293: You should do a make cleandir and try again. Make sure to run make obj after
! 294: the cvs update.
! 296: * You can put switches for specific commands in a `.cvsrc` in your home
! 297: directory, and they will be automatically used. A sample `.cvsrc` would be:
! 299: update -dP
! 300: checkout -P
! 301: diff -u
! 303: ## Importing and merging sources.
! 305: Sources are imported as follows:
! 307: $ cvs -d /misc/cvsrep import -I ! -I CVS netbsd netbsd current-date
! 309: `date` is replaced by the date of the SUP for tracking purposes. The
! 310: `-I ! -I CVS` options ensure that no file in the source tree is ignored
! 311: except 'CVS' directories. This is because some NetBSD source files have
! 312: extensions which are normally ignored by CVS. If there are any conflicts
! 313: with local patches the import command will report them and will describe
! 314: a command to merge the conflicts something like:
! 316: $ cvs checkout -jnetbsd:yesterday -jnetbsd netbsd
! 318: This merge command will correctly merge the imported NetBSD sources but
! 319: it will not handle the removal of files locally which have already been
! 320: removed by the SUP process. To do this the merge command would be:
! 322: $ cvs update -jprevious_import_tag -j current-date
! 324: `previous_import_tag` should be replaced with the name of the tag used
! 325: for the previous cvs import. `date` should be replaced with the current
! 326: date to yield the same tag used on the current import that has just been
! 327: merged.
! 329: The conflicts reported by the import command are potential conflicts.
! 330: These are usually merged by the update command but in some cases a real
! 331: conflict occurs. In these cases a manual merge of the conflicting lines
! 332: will be required. A real conflict will be reported in the cvs update
! 333: output as a `C` followed by a filename.
! 335: Merging conflicts manually is not a simple process but in most cases it
! 336: should be resolved by removing the local changes and making the file
! 337: like the original NetBSD source code.
! 339: CVS marks conflicts as follows:
! 341: <<<<<<
! 342: code from local file
! 343: ======
! 344: code from imported file
! 345: >>>>>> local revision number of newly imported revision
! 347: If the import reports no conflicts the checked out copy of the tree
! 348: should be updated in exactly the same way as for the conflicts case.
! 350: All update and checkout commands should be done in the directory where
! 351: the sources have been checked out. On my system this is
! 352: `/usr/src/netbsd`.
! 354: If this is the first import then there will be no sources checked out.
! 355: Assuming you wish to create the source tree in `/usr/src/netbsd` The
! 356: following commands will check out the source and no merge step is
! 357: required.
! 359: $ cd /usr/src
! 360: $ cvs -d /misc/cvsrep checkout netbsd
! 362: ## Tagging a successful build
! 364: If the build completes successfully, and produces a working set of binaries, it
! 365: can be useful to tag the working sources. This allows rewinding to a working
! 366: build tree with a single CVS command in the event that the current tree becomes
! 367: unbuildable for any reason. This can be performed by issuing the following
! 368: command:
! 370: $ cvs tag successful-build-BUILD date
! 372: ### Notes
! 374: * If the NetBSD customised version of CVS, which recognises `$NetBSD$`
! 375: markers in files, is not used, the NetBSD revision number of the file is
! 376: available for reference purposes when build problems occur.
! 377: * The sup/import/merge sequence described above is quite easily
! 378: automatable. The following Perl script automates this process.
! 380: #!/usr/pkg/bin/perl
! 381: #
! 382: # Script to SUP NetBSD-current, import it into CVS and merge it with
! 383: # any local changes.
! 384: #
! 385: # NOTES:
! 386: # This script does no error handling so is not really suitable for
! 387: # non-interactive use.
! 388: #
! 389: # This script has only been test with cvs-1.10.1 and cvs-1.9.18.
! 390: #
! 391: $SRCROOT="/usr/src/netbsd";
! 392: $IMPORTROOT="/misc/import";
! 393: $CVSROOT="/misc/cvsrep";
! 394: #run the sup into a perl stream
! 395: system "/usr/sbin/sup -zsv" ; # This may need to change for none
! 396: # current systems
! 397: # now import the new files into CVS
! 399: chdir $IMPORTROOT or die "Could not cd to $IMPORTROOT\n";
! 401: ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime;
! 402: $date = localtime;
! 403: $shortdate = sprintf "%02d%02d%04d",$mday,$mon+1,1900+$year;
! 404: system "/usr/local/bin/cvs -d$CVSROOT import -I ! -m\"SUP Import $date\" netbsd netbsd current-$shortdate ";
! 406: # make the working directory the local NetBSD Tree
! 407: chdir $SRCROOT or die "Could not change to $SRCROOT directory\n";
! 409: # Now do the import.
! 410: $lastimport = `cat /usr/src/netbsd/.tag`; # `s are backquotes
! 411: $lastimport =~ s/\n//; # strip off any trailing newline in the string
! 412: system "/usr/local/bin/cvs update -j $lastimport -j
! 413: current-$shortdate ";
! 414: # Now write the current file into tag save file
! 415: open TAG,">$SRCROOT/.tag" or die "Could not open new tag file";
! 416: print TAG "current-$shortdate";
! 417: close TAG;
! 419: This script was written in Perl since it is the scripting tool which the
! 420: author has the most experience with. It should be fairly straightforward to
! 421: write a shell script to perform the same task.
! 423: * Techniques for tracking current with CVS have been discussed several times on
! 424: the NetBSD current-users mailing list. For alternative techniques try
! 425: searching the NetBSD mailing lists.
! 427: If you have any comments or suggestions please send them to
! 428: [Mike Pumford](mailto:email@example.com) (who maintains this
! 429: entry) or <www@NetBSD.org>.
! 431: ## Getting the whole repository
! 433: All the procedures described above allow you keeping your own changes in your
! 434: repository, which has its advantages if you develop your own software based on
! 435: NetBSD. If you don't want to maintain your own CVS repository, but just want to
! 436: mirror NetBSD's CVS repository, there are three ways to do so.
! 438: Each of the methods described briefly below will get you a copy of the NetBSD
! 439: CVS repository (i.e. the RCS ,v files, not the checked out files!). You can then
! 440: setup your own anoncvs server or check out to a local harddisk. It's also useful
! 441: for fast access to the history information stored in the repository.
! 443: The methods to retrieve the whole repository are:
! 445: * **sup**
! 447: If you use sup already to mirror other parts of the NetBSD source,
! 448: you will want to add the following lines to your sup config file:
! 450: anoncvs release=all host=sup.NetBSD.org hostbase=/ftp/pub \
! 451: base=/usr prefix=/usr backup use-rel-suffix compress
! 453: After that, run `sup /path/to/supfile anoncvs` to retrieve the files.
! 455: Some example sup files are available in `/usr/share/examples/supfiles`. Also,
! 456: check our
! 457: [list of SUP mirrors](http://netbsd.org/mirrors/#sup) to find the server
! 458: closest to you!
! 460: * **rsync**
! 462: Note that rsync puts quite a heavy load on our rsync server, and as such the
! 463: number of concurrent rsync users is restricted. If you still want to try
! 464: rsync, the command to retrieve the repository is:
! 466: $ rsync -v -a --delete --exclude '#cvs.lock' rsync://anoncvs.NetBSD.org/cvsroot/src .
! 468: Please see our [list of rsync mirrors](http://netbsd.org/mirrors/#rsync)!
! 470: * **cvsup**
! 472: * CVSup is not currently available for all NetBSD architectures, since the M3
! 473: compiler has not been ported. On i386, you can mirror the repository from
! 474: cvsup.de.NetBSD.org with the `devel/cvsup` package and the following config
! 475: file:
! 477: *default host=cvsup.de.NetBSD.org
! 478: *default base=/usr
! 479: *default prefix=/local/NetBSD-cvs
! 480: *default release=cvs
! 481: *default delete use-rel-suffix
! 482: *default compress
! 484: netbsd
! 486: Please see our [list of CVSup mirrors](http://netbsd.org/mirrors/#cvsup)!
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