|Maximum RPM: Taking the Red Hat Package Manager to the Limit|
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Now that amanda has been configured, built, and is operational on our build system, it's time to have RPM take over each of these tasks. The first task is to have RPM make the necessary changes to the original sources. To do that, RPM needs a patch file.
The amanda-2.3.0 directory tree is where we did all our work building amanda. We need to take all the work we've done in that directory tree and compare it against the original sources contained in the amanda-2.3.0-orig directory tree. But before we do that, we need to clean things up a bit.
Looking through our work tree, it has all sorts of junk in it: emacs save files, object files, and the executable programs. In order to generate a clean set of patches, all these extraneous files must go. Looking over amanda's makefiles, there is a clean target that should take care of most of the junk:
# make clean Making clean in common-src … rm -f *~ *.o *.a genversion version.c Makefile.out … Making clean in client-src … rm -f amandad sendsize calcsize sendbackup-dump sendbackup-gnutar runtar selfcheck *~ *.o Makefile.out … Making clean in server-src … rm -f amrestore amadmin amflush amlabel amcheck amdump amcleanup amtape taper dumper driver planner reporter getconf *~ *.o Makefile.out … Making clean in changer-src … rm -f chg-generic *~ *.o Makefile.out … Making clean in man … rm -f *~ Makefile.out … #
Looking in the tools and config directories where we did all our work, we see there are still emacs save files there. A bit of studying confirms that the makefiles don't bother to clean these two directories. That's a nice touch because a make clean won't wipe out old copies of the config files, giving you a chance to go back to them in case you've botched something. However, in our case, we're sure we won't need the save files, so out they go:
# cd /usr/src/redhat/SOURCES/amanda-2.3.0 # find . -name "*~" -exec rm -vf \; ./config/config.h~ ./config/options.h~ ./tools/munge~ #
We let find take a look at the whole directory tree, just in case there was something still out there that we'd forgotten about. As you can see, the only save files are from the three files we've been working on.
You'll note that we've left our modified munge file, as well as the config.h and options.h files we so carefully crafted. That's intentional, as we want to make sure those changes are applied when RPM patches the sources. Everything looks pretty clean, so it's time to make the patches.
This step is actually pretty anticlimactic:
# diff -uNr amanda-2.3.0-orig/ amanda-2.3.0/ > amanda-2.3.0-linux.patch #
With that one command, we've compared each file in the untouched directory tree (amanda-2.3.0-orig) with the directory tree we've been working in (amanda-2.3.0). If we've done our homework, the only things in the patch file should be related to the files we've changed. Let's take a look through it to make sure:
# cd /usr/src/redhat/SOURCES # cat amanda-2.3.0-linux.patch diff -uNr amanda-2.3.0-orig/config/config.h amanda-2.3.0/config/config.h --- amanda-2.3.0-orig/config/config.h Wed Dec 31 19:00:00 1969 +++ amanda-2.3.0/config/config.h Sat Nov 16 16:22:47 1996 @@ -0,0 +1,52 @@ … diff -uNr amanda-2.3.0-orig/config/options.h amanda-2.3.0/config/options.h --- amanda-2.3.0-orig/config/options.h Wed Dec 31 19:00:00 1969 +++ amanda-2.3.0/config/options.h Sat Nov 16 17:08:57 1996 @@ -0,0 +1,211 @@ … diff -uNr amanda-2.3.0-orig/tools/munge amanda-2.3.0/tools/munge --- amanda-2.3.0-orig/tools/munge Sun May 19 22:11:25 1996 +++ amanda-2.3.0/tools/munge Sat Nov 16 16:23:50 1996 @@ -35,10 +35,10 @@ # Customize CPP to point to your system's C preprocessor. # if cpp is on your path: -CPP=cpp +# CPP=cpp # if cpp is not on your path, try one of these: -# CPP=/lib/cpp # traditional +CPP=/lib/cpp # traditional # CPP=/usr/lib/cpp # also traditional # CPP=/usr/ccs/lib/cpp # Solaris 2.x #
The patch file contains complete copies of our config.h and options.h files, followed by the changes we've made to munge. Looks good! Time to hand this grunt work over to RPM.
Since amanda comes in two parts, it's obvious we'll need to use subpackages: one for the client software, and one for the server. Given that, and the fact that the first part of any spec file consists of tags that are easily filled in, let's sit down and fill in the blanks, tag-wise:
Summary: Amanda Network Backup System Name: amanda Version: 2.3.08 Release: 1 Group: System/Backup Copyright: BSD-like, but see COPYRIGHT file for details Packager: Edward C. Bailey <email@example.com> URL: http://www.cs.umd.edu/projects/amanda/ Source: ftp://ftp.cs.umd.edu/pub/amanda/amanda-2.3.0.tar.gz Patch: amanda-2.3.0-linux.patch %description Amanda is a client/server backup system. It uses standard tape devices and networking, so all you need is any working tape drive and a network. You can use it for local backups as well.
That part was pretty easy. We set the package's release number to 1. We'll undoubtedly be changing that as we continue work on the spec file. You'll notice that we've included a URL tag line; the Uniform Resource Locator there points to the homepage for the amanda project, making it easier for the user to get additional information on amanda.
The Source tag above includes the name of the original source tar file and is preceded by the URL pointing to the file's primary location. Again, this makes it easy for the user to grab a copy of the sources from the software's "birthplace".
Finally, the patch file that we've just created gets a line of its own on the Patch tag line. Next, let's take a look at the tags for our two subpackages. Let's start with the client:
%package client Summary: Client-side Amanda package Group: System/Backup Requires: dump %description client The Amanda Network Backup system contains software necessary to automatically perform backups across a network. Amanda consists of two packages -- a client (this package), and a server: The client package enable a network-capable system to have its filesystems backed up by a system running the Amanda server. NOTE: In order for a system to perform backups of itself, install both the client and server packages!
The %package directive names the package. Since we wanted the subpackages to be named amanda-<something>, we didn't use the -n option. This means our client subpackage will be called amanda-client, just as we wanted. RPM requires unique summary, %description, and group tags for each subpackage, so we've included them. Of course, it would be a good idea even if RPM didn't require them — we've used the tags to provide client-specific information.
The requires tag is the only other tag in the client subpackage. Since amanda uses dump on the client system, we included this tag so that RPM will ensure that the dump package is present on client systems.
Next, let's take a look at the tags for the server subpackage:
%package server Summary: Server-side Amanda package Group: System/Backup %description server The Amanda Network Backup system contains software necessary to automatically perform backups across a network. Amanda consists of two package -- a client, and a server (this package): The server package enables a network-capable system to control one or more Amanda client systems performing backups. The server system will direct all backups to a locally attached tape drive. Therefore, the server system requires a tape drive. NOTE: In order for a system to perform backups of itself, install both the client and server packages!
No surprises here, really. You'll note that the server subpackage has no requires tag for the dump package. The reason for that is due to a design decision we've made. Since amanda is comprised of a client and a server component, in order for the server system to perform backups of itself, the client component must be installed. Since we've already made the client subpackage require dump, we've already covered the bases.
Since an amanda server cannot back itself up without the client software, why don't we have the server subpackage require the client subpackage? Well, that could be done, but the fact of the matter is that there are cases where an amanda server won't need to back itself up. So the server subpackage needs no package requirements.
Next we need to add the build-time scripts. There's really not much to them:
%prep %setup %build make %install make install
The %prep script consists of one line containing the simplest flavor of %setup macro. Since we only need %setup to unpack one set of sources, there are no options we need to add.
The %build script is just as simple, with the single make command required to build amanda.
Finally, the %install script maintains our singe-line trend for build-time scripts. Here a simple make install will put all the files where they need to be for RPM to package them.
The last part of our initial attempt at a spec file is a %files list for each package the spec file will build. Since we're planning on a client and a server subpackage, we'll need two %files lists. For the time being, we'll just add the %files lines — we'll be adding the actual filenames later:
%files client %file server
There's certainly more to come, but this is enough to get us started. And the first thing we want RPM to do is to unpack the amanda sources.
In keeping with a step-by-step approach, RPM has an option that let's us stop the build process after the %prep script has run. Let's give the -bp option a try, and see how things look:
# rpm -bp amanda-2.3.0.spec * Package: amanda * Package: amanda-client * Package: amanda-server + umask 022 + echo Executing: %prep Executing: %prep + cd /usr/src/redhat/BUILD + cd /usr/src/redhat/BUILD + rm -rf amanda-2.3.0 + gzip -dc /usr/src/redhat/SOURCES/amanda-2.3.0.tar.gz + tar -xvvf - drwxr-xr-x 3/20 0 May 19 22:10 1996 amanda-2.3.0/ -rw-r--r-- 3/20 1389 May 19 22:11 1996 amanda-2.3.0/COPYRIGHT -rw-r--r-- 3/20 1958 May 19 22:11 1996 amanda-2.3.0/Makefile -rw-r--r-- 3/20 11036 May 19 22:11 1996 amanda-2.3.0/README … -rw-r--r-- 3/20 2010 May 19 22:11 1996 amanda-2.3.0/man/amtape.8 drwxr-xr-x 3/20 0 May 19 22:11 1996 amanda-2.3.0/tools/ -rwxr-xr-x 3/20 2437 May 19 22:11 1996 amanda-2.3.0/tools/munge + [ 0 -ne 0 ] + cd amanda-2.3.0 + cd /usr/src/redhat/BUILD/amanda-2.3.0 + chown -R root.root . + chmod -R a+rX,g-w,o-w . + exit 0 #
By looking at the output, it would be pretty hard to miss the fact that the sources were unpacked. If we look in RPM's default build area (/usr/src/redhat/BUILD), we'll see an amanda directory tree:
# cd /usr/src/redhat/BUILD/ # ls -l total 3 drwxr-xr-x 11 root root 1024 May 19 1996 amanda-2.3.0 #
After a quick look around, it seems like the sources were unpacked properly. But wait — where are our carefully crafted configuration files in config? Why isn't tools/munge modified?
Ah, perhaps our %prep script was a bit too simple. We need to apply our patch. So let's add two things to our spec file:
A patch tag line pointing to our patch file
A %patch macro in our %prep script
Easy enough. At the top of the spec file, along with the other tags, let's add:
Then we'll make our %prep script look like this:
%prep %setup %patch -p 1
There, that should do it. Let's give that -bp option another try:
# rpm -bp amanda-2.3.0.spec * Package: amanda * Package: amanda-client * Package: amanda-server + umask 022 + echo Executing: %prep Executing: %prep + cd /usr/src/redhat/BUILD + cd /usr/src/redhat/BUILD + rm -rf amanda-2.3.0 + gzip -dc /usr/src/redhat/SOURCES/amanda-2.3.0.tar.gz + tar -xvvf - drwxr-xr-x 3/20 0 May 19 22:10 1996 amanda-2.3.0/ -rw-r--r-- 3/20 1389 May 19 22:11 1996 amanda-2.3.0/COPYRIGHT -rw-r--r-- 3/20 1958 May 19 22:11 1996 amanda-2.3.0/Makefile -rw-r--r-- 3/20 11036 May 19 22:11 1996 amanda-2.3.0/README … -rw-r--r-- 3/20 2010 May 19 22:11 1996 amanda-2.3.0/man/amtape.8 drwxr-xr-x 3/20 0 May 19 22:11 1996 amanda-2.3.0/tools/ -rwxr-xr-x 3/20 2437 May 19 22:11 1996 amanda-2.3.0/tools/munge + [ 0 -ne 0 ] + cd amanda-2.3.0 + cd /usr/src/redhat/BUILD/amanda-2.3.0 + chown -R root.root . + chmod -R a+rX,g-w,o-w . + echo Patch #0: Patch #0: + patch -p1 -s + exit 0 #
Not much difference, until the very end, where we see the patch being applied. Let's take a look into the build area and see if our configuration files are there:
# cd /usr/src/redhat/BUILD/amanda-2.3.0/config # ls -l total 58 -rw-r--r-- 1 root root 7518 May 19 1996 config-common.h -rw-r--r-- 1 root root 1846 Nov 20 20:46 config.h -rw-r--r-- 1 root root 2081 May 19 1996 config.h-aix -rw-r--r-- 1 root root 1690 May 19 1996 config.h-bsdi1 … -rw-r--r-- 1 root root 1830 May 19 1996 config.h-ultrix4 -rw-r--r-- 1 root root 0 Nov 20 20:46 config.h.orig -rw-r--r-- 1 root root 7196 Nov 20 20:46 options.h -rw-r--r-- 1 root root 7236 May 19 1996 options.h-vanilla -rw-r--r-- 1 root root 0 Nov 20 20:46 options.h.orig #
Much better. Those zero-length .orig files are a dead giveaway that patch has been here, as are the dates on config.h, and options.h. In the tools directory, munge has been modified, too. These sources are ready for building!
We know that the sources are ready. We know that the %build script is ready. There shouldn't be much in the way of surprises if we let RPM build amanda. Let's use the -bc option to stop things after the %build script completes:
# rpm -bc amanda-2.3.0.spec * Package: amanda * Package: amanda-client * Package: amanda-server … echo Executing: %build Executing: %build + cd /usr/src/redhat/BUILD + cd amanda-2.3.0 + make Making all in common-src make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/common-src' ../tools/munge Makefile.in Makefile.out make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/common-src' cc -g -I. -I../config -c error.c -o error.o cc -g -I. -I../config -c alloc.c -o alloc.o … Making all in man make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/man' ../tools/munge Makefile.in Makefile.out make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/man' make: Nothing to be done for `all'. make: Leaving directory `/usr/src/redhat/BUILD/amanda-2.3.0/man' make: Leaving directory `/usr/src/redhat/BUILD/amanda-2.3.0/man' + exit 0 #
As we thought, no surprises. A quick look through the build area shows a full assortment of binaries, all ready to be installed. So it seems that the most natural thing to do next would be to let RPM install amanda.
And that's just what we're going to do! Our %install script has the necessary make install command, so let's give it a shot:
# rpm -bi amanda-2.3.0.spec * Package: amanda * Package: amanda-client * Package: amanda-server … echo Executing: %build Executing: %build + cd /usr/src/redhat/BUILD + cd amanda-2.3.0 + make Making all in common-src make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/common-src' ../tools/munge Makefile.in Makefile.out make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/common-src' cc -g -I. -I../config -c error.c -o error.o cc -g -I. -I../config -c alloc.c -o alloc.o … + umask 022 + echo Executing: %install Executing: %install + cd /usr/src/redhat/BUILD + cd amanda-2.3.0 + make install Making install in common-src make: Entering directory `/usr/src/redhat/BUILD/amanda-2.3.0/common-src' … install -c -o bin amrestore.8 /usr/man/man8 install -c -o bin amtape.8 /usr/man/man8 make: Leaving directory `/usr/src/redhat/BUILD/amanda-2.3.0/man' make: Leaving directory `/usr/src/redhat/BUILD/amanda-2.3.0/man' + exit 0 + umask 022 + echo Executing: special doc Executing: special doc + cd /usr/src/redhat/BUILD + cd amanda-2.3.0 + DOCDIR=//usr/doc/amanda-2.3.0-1 + DOCDIR=//usr/doc/amanda-client-2.3.0-1 + DOCDIR=//usr/doc/amanda-server-2.3.0-1 + exit 0 #
Everything looks pretty good. At this point, the amanda software, built by RPM, has been installed on the build system. Since performed all the configuration steps before, when we were manually building amanda, everything should still be configured properly to test this new build.  So why don't we give the new binaries a try?
After a quick double-check to ensure that all the configuration steps were still in place from our manual build, we reran our tests. No problems were found. It's time to build some packages!
Of course, if the process of installing the software changed some necessary config files, they would have to be redone, but in this case it didn't happen.