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Using CVS (part 2) |
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================== |
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tdb1, 29/10/00. |
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Contents |
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-------- |
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- Errata to "Using CVS (part 1)" |
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- Setting up CVS on a Public PC (with WinCVS/SSH) |
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- Setting up CVS off campus/SSB (with WinCVS/SSH) |
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|
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- How CVS handles binary files |
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- Tagging the Repository |
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- Branching in CVS |
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- Keyword Expansion |
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- Online CVS Resources |
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|
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- See "Using CVS (part 1)" for basic information on setting |
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up and using CVS at UKC. |
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|
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tdb1, 29/10/00. |
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|
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Errata to "Using CVS (part 1)" |
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------------------------------ |
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Setting up CVS on a Public PC (with WinCVS/SSH) |
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----------------------------------------------- |
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Assuming you already have WinCVS working we just need to |
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make a few modifications to get the same thing working with |
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SSH. This will only work on a public PC, although with some |
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careful copying of files you might be able to get it to work |
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Assuming you already have WinCVS working we just need to |
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make a few modifications to get the same thing working with |
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SSH. This will only work on a public PC, although with some |
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careful copying of files you might be able to get it to work |
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on a normal SSB machine. |
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Firstly we need to get SSH working. As it is SSH does work, |
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but it will keep prompting for a password, which is a pain |
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when it's hidden in a cmd window somewhere. We'll start by |
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tweaking the SSH setup, and then we'll setup a key pair to |
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Firstly we need to get SSH working. As it is SSH does work, |
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but it will keep prompting for a password, which is a pain |
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when it's hidden in a cmd window somewhere. We'll start by |
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tweaking the SSH setup, and then we'll setup a key pair to |
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remove the need for a password. |
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[adapted from instructions given by jc] |
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First thing is to setup a few environment variables. This is |
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done in the System part of Control Panel. Under the User |
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First thing is to setup a few environment variables. This is |
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done in the System part of Control Panel. Under the User |
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Variables section add the following; |
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HOME = |
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CVSROOT = |
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:ext:user@raptor.ukc.ac.uk:/usr/local/proj/co600_10/cvs |
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Next we need to go about setting up the key pair. This is |
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done by two batch files called getkey.bat and copy-key.bat |
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which are already on the public PC's. Unfortunately you need |
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to modify getkey.bat to make it work with raptor, so copy it |
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from the C: drive (c:\winnt\system32 I believe) to your |
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desktop (or anywhere else). Edit it so that the third line |
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Next we need to go about setting up the key pair. This is |
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done by two batch files called getkey.bat and copy-key.bat |
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which are already on the public PC's. Unfortunately you need |
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to modify getkey.bat to make it work with raptor, so copy it |
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from the C: drive (c:\winnt\system32 I believe) to your |
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desktop (or anywhere else). Edit it so that the third line |
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reads; |
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set HOST=raptor |
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Then run it. You'll be prompted for your raptor password |
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three times, and then the key is setup. Next you need to run |
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copy-key.bat. Just go to "Start -> Run -> copy-key raptor" |
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Then run it. You'll be prompted for your raptor password |
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three times, and then the key is setup. Next you need to run |
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copy-key.bat. Just go to "Start -> Run -> copy-key raptor" |
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to make it do it's stuff. |
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Now, we're pretty much all set. You should be able to type |
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"ssh raptor" into a command window and log straight in |
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without the need for a password. If not, something has gone |
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wrong ! |
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Now, we're pretty much all set. You should be able to type |
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"ssh -l <user> raptor" into a command window and log |
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straight in without the need for a password. If not, |
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something has gone wrong ! |
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Finally, a quick alteration to WinCVS and we're done. In the |
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Finally, a quick alteration to WinCVS and we're done. In the |
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preferences set the CVS Root to be; |
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:ext:user@raptor.ukc.ac.uk:/usr/local/proj/co600_10/cvs |
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Then set the Authentication type to "SSH server". Assuming |
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you've already done the rest of the setup from the last |
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document you should be able to do a checkout as normal, but |
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this time without the need for a mapped drive - which is a |
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Then set the Authentication type to "SSH server". Assuming |
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you've already done the rest of the setup from the last |
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document you should be able to do a checkout as normal, but |
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this time without the need for a mapped drive - which is a |
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much neater way of doing things. |
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Setting up CVS off campus/SSB (with WinCVS/SSH) |
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----------------------------------------------- |
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To do this you'll need two packages. Firstly, and most |
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obviously WinCVS. The latest version of WinCVS (1.1b16) can |
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be downloaded from the "WinCvs 1.1 *BETA* / Client + Local / |
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Binaries" on the following page; |
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http://www.wincvs.org/download.html |
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Secondly you'll require SSH. I'm not sure where this package |
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orginated, but there is a current version on raptor at; |
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/usr/local/proj/co600_10/sshwin32/ssh-1.2.14-win32bin.zip |
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Armed with those two files you're ready to go. To get |
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started we need to get ssh installed, and a key setup with |
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raptor. |
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Installing ssh is easy. Simply extract the contents of the |
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zip file in to your windows\system32 directory (on |
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winnt/win2k - windows\system on win9x). This will put the |
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DLL's in place and the binary ssh files. |
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|
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Next, setting up a key. This requires a few straightforward |
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steps. |
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- setup a directory (on your machine) to be considered your |
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"home folder" and then ensure that the environment |
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variable HOME is pointed at this directory. Then make a |
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directory called .ssh within this. |
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|
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- telnet into raptor and run this command; |
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ssh-keygen -f ssh-newkey -q -P '' -C '<user> on NT' |
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|
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make sure you change <user> for your userid, and that you |
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notice that there are *only* single quotes like this ' . |
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|
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- using ftp (or by any other means) copy the files named |
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ssh-newkey and ssh-newkey.pub to the .ssh folder you made |
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on your machine. Now rename them to identity and |
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identity.pub respectively. |
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|
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- Finally we need to get the contents of the identity.pub |
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file above into the file ~/.ssh/authorized_keys on |
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raptor. The easiest way to do this is to type the |
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following; |
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cat ssh-newkey.pub >> .ssh/authorized_keys |
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|
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This assumes you didn't delete the ssh-newkey files, and |
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that you are in your home folder. Finally, you can delete |
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the ssh-newkey and ssh-newkey.pub files from raptor. |
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|
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Now, to test this setup you should try the following from a |
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command prompt (on your machine, not raptor); |
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|
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ssh -l <userid> raptor.ukc.ac.uk |
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|
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If everything has completed successfully you should now be |
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looking at a raptor prompt. You should NOT have been asked |
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for a password ! If it went wrong... work out why! |
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|
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Right, now on to WinCVS. This is now a doddle. In the |
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preferences set the CVSROOT to; |
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|
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:ext:<user>@raptor.ukc.ac.uk:/usr/local/proj/co600_10/cvs |
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|
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Set Authentication to SSH server, and set the RSA identity |
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to your identity file (not the .pub one). On the ports tab |
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check the "alternate rsh name" box at the bottom, and make |
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sure "ssh" is in the text box. You might also like to |
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uncheck "checkout read-only" and "prune empty directories" |
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on the globals tab. |
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|
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Finally set the browser directory to a suitable location and |
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try checking something out. If all has worked an SSH window |
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should pop up at the bottom of the screen and the files |
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should appear. |
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|
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As a final note, turning TCP/IP compression on may make it |
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quicker over a modem. |
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|
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How CVS handles binary files |
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---------------------------- |
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Basically CVS can't do version management of binary files, |
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and quite obviously this is because it's not possible to |
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make version comparisons between two revisions in a logical |
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way. But, CVS will let you store binary files and will let |
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you add new versions. However, it will not store "changes" |
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Basically CVS can't do version management of binary files, |
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and quite obviously this is because it's not possible to |
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make version comparisons between two revisions in a logical |
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way. But, CVS will let you store binary files and will let |
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you add new versions. However, it will not store "changes" |
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between them, or allow you to view diffs between them. |
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|
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IMPORTANT: You must make sure you tell CVS that a file is |
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binary, otherwise it will not store it correctly |
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IMPORTANT: You must make sure you tell CVS that a file is |
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binary, otherwise it will not store it correctly |
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and the file will be corrupted. |
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|
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In WinCVS it's really easy to add a binary file, simply |
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select "Add selection binary" instead of the usual "Add |
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selection". WinCVS will display a "binary" icon instead, and |
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add "-kb" into the Option column. This -kb tells the CVS |
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In WinCVS it's really easy to add a binary file, simply |
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select "Add selection binary" instead of the usual "Add |
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selection". WinCVS will display a "binary" icon instead, and |
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add "-kb" into the Option column. This -kb tells the CVS |
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command that the file is binary. |
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|
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This leads nicely into how to do it from the command line. |
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You simply type the following in place of the usual "cvs |
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This leads nicely into how to do it from the command line. |
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You simply type the following in place of the usual "cvs |
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add" command. |
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|
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cvs add -kb <filename> |
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|
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Again, the -kb is present. Now, a quick explanation of what |
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this "-kb" means. Basically it is telling CVS not to do |
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keyword expansion (turning $Revision$ into $Revision$) |
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and tell is not to attempt to convert between unix/windows |
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Again, the -kb is present. Now, a quick explanation of what |
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this "-kb" means. Basically it is telling CVS not to do |
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keyword expansion (turning $Revision$ into $Revision$) |
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and tell is not to attempt to convert between unix/windows |
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text formats. |
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|
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Tagging the Repository |
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---------------------- |
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Tagging the repository is a way of "marking" all the files |
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at a particular point in time. For example, when "release 1" |
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is finished you might want to mark this in the history of |
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all the files, so you can easily come back to it in the |
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future. As every file the makes up "release 1" may be on a |
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different individual revision, it would be tedious to do |
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Tagging the repository is a way of "marking" all the files |
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at a particular point in time. For example, when "release 1" |
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is finished you might want to mark this in the history of |
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> |
all the files, so you can easily come back to it in the |
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future. As every file the makes up "release 1" may be on a |
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different individual revision, it would be tedious to do |
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without the aid of tagging. |
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|
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This is the best example I've seen that clearly shows how a |
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tag is implemented. Imagine the dotted line signfies the |
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point at which you declared the files were "release 1". As |
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you can see, work as continued on the files, but you could |
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This is the best example I've seen that clearly shows how a |
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tag is implemented. Imagine the dotted line signfies the |
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point at which you declared the files were "release 1". As |
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you can see, work as continued on the files, but you could |
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easily pull out each file at "release 1". |
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|
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File A File B File C File D File E |
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\ 1.16 / |
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`-1.17-' |
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|
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In fact, if you imagine pulling this line straight, you'd |
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get the following effect which even more clearly shows where |
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In fact, if you imagine pulling this line straight, you'd |
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get the following effect which even more clearly shows where |
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"release 1" is. |
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|
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File A File B File C File D File E |
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1.3 1.11 1.5 1.17 1.9 |
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1.6 1.17 1.10 |
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|
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Tagging is actually remarkably easy to do. All you do is |
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issue a single command to tag the files at the current point |
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in time. You should make sure all development stops whilst |
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you do it, otherwise a bit of new code could sneak in. |
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Tagging is actually remarkably easy to do. All you do is |
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issue a single command to tag the files at the current point |
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in time. You should make sure all development stops whilst |
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you do it, otherwise a bit of new code could sneak in. |
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Here's how to do it; |
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|
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cvs tag public-release_1 |
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|
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This would mark the files with the tag "public-release_1". |
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You can then continue with developement, knowing that all |
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those files can easily be retrieved. It's again suprisingly |
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easy to do. Instead of typing "cvs checkout source" you |
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This would mark the files with the tag "public-release_1". |
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You can then continue with developement, knowing that all |
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those files can easily be retrieved. It's again suprisingly |
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easy to do. Instead of typing "cvs checkout source" you |
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would type; |
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|
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cvs checkout -r public-release_1 source |
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|
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Which would checkout the source module at the point which |
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you tagged. Alternatively the following would update (or |
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Which would checkout the source module at the point which |
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you tagged. Alternatively the following would update (or |
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downdate ?) your working copy to the tagged point; |
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|
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cvs update -r public-release_1 |
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|
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Finally, a quick mention of why this would be useful. |
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Imagine the development team was split into two groups, one |
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working on coding, another working on testing. When the |
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coding group have finished "release 1" they can tag it and |
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carry on developing for "release 2". At the same time, the |
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testing team can checkout "release 1" and test it, reporting |
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bugs back to the coding team for fixing in "release 2". It |
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could also mean the a customer could still get hold of the |
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> |
Finally, a quick mention of why this would be useful. |
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> |
Imagine the development team was split into two groups, one |
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> |
working on coding, another working on testing. When the |
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> |
coding group have finished "release 1" they can tag it and |
| 281 |
> |
carry on developing for "release 2". At the same time, the |
| 282 |
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testing team can checkout "release 1" and test it, reporting |
| 283 |
> |
bugs back to the coding team for fixing in "release 2". It |
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could also mean the a customer could still get hold of the |
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|
first release whilst you're busy coding for the second. |
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|
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Branching in CVS |
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---------------- |
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So far I've only talked about a single CVS branch, the |
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trunk. There is only ever one "current" revision of each |
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file, and everyone is working on the same files. However, it |
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< |
is possible to branch this out into more than one copy of |
| 293 |
< |
the same files. A good example of why this is useful is |
| 289 |
> |
So far I've only talked about a single CVS branch, the |
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> |
trunk. There is only ever one "current" revision of each |
| 291 |
> |
file, and everyone is working on the same files. However, it |
| 292 |
> |
is possible to branch this out into more than one copy of |
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> |
the same files. A good example of why this is useful is |
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|
continuing the idea at the end of the last section. |
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|
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Imagine the coding team are now busy working on "release 2" |
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and the testing team come up with a major flaw in |
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the older "release 1". Customers have already got this |
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< |
version installed, so it needs fixing straight away. The |
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trick is to make a branch at the point where "release 1" was |
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tagged, and then fix the bugs on this branch. This branch |
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< |
need not carry on, it could just have the few bugs fixed, |
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< |
whilst the main branch (the trunk) has development of |
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> |
Imagine the coding team are now busy working on "release 2" |
| 297 |
> |
and the testing team come up with a major flaw in |
| 298 |
> |
the older "release 1". Customers have already got this |
| 299 |
> |
version installed, so it needs fixing straight away. The |
| 300 |
> |
trick is to make a branch at the point where "release 1" was |
| 301 |
> |
tagged, and then fix the bugs on this branch. This branch |
| 302 |
> |
need not carry on, it could just have the few bugs fixed, |
| 303 |
> |
whilst the main branch (the trunk) has development of |
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|
"release 2" carrying on. This diagram shows this; |
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|
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|
| |
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| |
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| -- tag "release_2" |
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|
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As you can see the customer could then get a copy of |
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"release_1-fixed" and not worry about the unstable code in |
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> |
As you can see the customer could then get a copy of |
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> |
"release_1-fixed" and not worry about the unstable code in |
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|
"release_2". |
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|
|
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Branches can get much more complicated than this, but it's |
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beyond the scope of our requirements. Further info can be |
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> |
Branches can get much more complicated than this, but it's |
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> |
beyond the scope of our requirements. Further info can be |
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|
found on the web. |
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|
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|
Keyword Expansion |
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|
----------------- |
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< |
CVS allows you to put certain keywords into a file which CVS |
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< |
will expand when you check files in and out of the |
| 329 |
< |
repository. There are quite a few, and they're all pretty |
| 327 |
> |
CVS allows you to put certain keywords into a file which CVS |
| 328 |
> |
will expand when you check files in and out of the |
| 329 |
> |
repository. There are quite a few, and they're all pretty |
| 330 |
|
useful in places. Here's a quick summary; |
| 331 |
|
|
| 332 |
|
$Author$ |
| 348 |
|
$Id$ |
| 349 |
|
|
| 350 |
|
$Log$ |
| 351 |
< |
Revision 1.1 2000/11/01 00:50:42 tdb |
| 352 |
< |
Checkin of second "Using CVS" paper, with keyword expansion turned off. |
| 351 |
> |
Revision 1.6 2004/08/01 10:39:54 tdb |
| 352 |
> |
Catch a lot of old URL's and update them. Also remove a couple of old files |
| 353 |
> |
that aren't used. |
| 354 |
|
|
| 355 |
|
Puts the latest log message in. |
| 356 |
|
|
| 378 |
|
State of the file (?). |
| 379 |
|
eg. $State$ |
| 380 |
|
|
| 381 |
< |
The keywords are automatically replaced by CVS, even if it's |
| 381 |
> |
The keywords are automatically replaced by CVS, even if it's |
| 382 |
|
already been expanded. You just put it in and leave it be! |
| 383 |
|
|
| 384 |
|
Online CVS Resources |
| 385 |
|
-------------------- |
| 386 |
< |
That about concludes my guide on the basics of CVS for the |
| 387 |
< |
development work in the project. However, further resources |
| 388 |
< |
can be found on the following webpage. I've learnt an awful |
| 389 |
< |
lot from this "online book", and I'd recommend it to anyone |
| 386 |
> |
That about concludes my guide on the basics of CVS for the |
| 387 |
> |
development work in the project. However, further resources |
| 388 |
> |
can be found on the following webpage. I've learnt an awful |
| 389 |
> |
lot from this "online book", and I'd recommend it to anyone |
| 390 |
|
wanting to get to grips with CVS. |
| 391 |
|
|
| 392 |
|
http://cvsbook.red-bean.com |
| 397 |
|
|
| 398 |
|
About |
| 399 |
|
----- |
| 400 |
< |
This document was written by Tim Bishop [tdb1@ukc.ac.uk] for |
| 401 |
< |
use by the team working on a 3rd year Computer Science |
| 402 |
< |
project called "i-scream". More details can be found on the |
| 400 |
> |
This document was written by Tim Bishop [tdb@i-scream.org] for |
| 401 |
> |
use by the team working on a 3rd year Computer Science |
| 402 |
> |
project called "i-scream". More details can be found on the |
| 403 |
|
project website; |
| 404 |
|
|
| 405 |
< |
http://www.i-scream.org.uk |
| 405 |
> |
http://www.i-scream.org |
