source: trunk/server/doc/package-build-howto @ 1933

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1This document is a how-to for building new packaages for scripts.mit.edu.
2
3Prerequisites
4=============
5
6  * A trusted scripts.mit.edu server
7  * A scripts-build account on that server (but that was created when it
8    was installed, or something's wrong)
9  * A set of personal credentials for the scripts svn repo
10
11Directions
12==========
13
14  * Log into the server as root
15
16  * /bin/su scripts-build # It's a bad idea to build as root.  This is
17                          # less urgent than it used to be, because you'll
18                          # be building using mock in a chroot, but it's
19                          # still good habit.  Also, if you work in
20                          # /srv/repository as root, scripts-build won't
21                          # be able to change some of the resulting files
22
23  * cd /srv/repository
24
25  * svn up  # Important both to build with current code, and because the
26            # svn revision becomes part of the package release number,
27            # and you can infer whether changes in the code were made
28            # before or after a particular build by looking at the package
29            # and svn release/revision.
30
31  * cd server/fedora
32
33  * # Look in the .dload directory.  If you want to build with a newer
34    # version of any upstream packages that are there, then
35    * rm .dload/[OLD-PACKAGES].src.rpm # It's fine to delete all SRPMs here
36    * rm download_stamp
37
38  * make [PACKAGE-YOU-WANT] # e.g. 'make httpd' builds Apache with our patches
39    # Note that openafs-devel is a build-dependency of accountadm, so if
40    # this is a new Fedora release being bootstrapped, you'll have to
41    # build openafs and install its -devel package before building accountadm
42
43  * # If the build succeeds, the mock logs, build log, binary and SRPMs
44    # will be in /var/lib/mock/fedora-[RELEASE]-{x86_64|i386}/result (note that
45    # this will be cleared out each time you start a new build, so if
46    # you're building several packages in succession, copy the results
47    # somewhere safe after each build to preserve them)
48    # Add the packages to the repository by using a trusted machine and
49    krootscp root@[BUILD-SERVER]:/var/lib/mock/fedora-[RELEASE]-{x86_64|i386}/result /mit/scripts/rpm-fc[RELEASE]
50
51  * # Rebuild the repo metadata to include the new packages.
52    cd /mit/scripts/rpm-fc[RELEASE]
53    # If you have a trusted machine:
54    createrepo .
55    # Otherwise, on a scripts server, as root:
56    mkdir /root/repodata-YYYYMMDD # Or any suitable temp directory
57    createrepo -o /root/repodata-YYYYMMDD .
58    # Then from your trusted machine
59    krootscp -r root@[BUILD-SERVER]:/root/repodata-YYYYMMDD /mit/scripts/rpm-fc[RELEASE]
60    # Sanity check the files, and then replace the current repodata directory
61    # with the one in repodata-YYYYMMDD.
62
63Patching packages
64=================
65
66  * To make changes to the packages that we are the upstream maintainers
67    of (that is, the packages that the Scripts Team wrote):
68    * The authoritative source lives in server/common/oursrc/[PACKAGE]
69    * The RPM spec file is server/fedora/specs/[PACAKGE].spec
70    * You directly make the relevant changes to those files, commit to
71      svn, and then rebuild the package as above to include the new changes.
72
73  * To make changes to the upstream packages that we "scriptsify":
74
75    * If we haven't previously scriptsified this package, you'll need
76      to add it to the upstream_yum line in SVN/server/fedora/Makefile,
77      and remove the download_stamp file so that it gets fetched next
78      time you run 'make [PACKAGE]'.
79
80    * The authoritative upstream source comes from the SRPM in the upstream
81      yum repo, or in odd cases like openafs, from some other URL.  When
82      you 'make [PACKAGE]' in SVN/server/fedora, if download_stamp has
83      been removed, the SRPMs are all refetched into
84      SVN/server/fedora/.dload, and then installed with 'rpm -i'.  This
85      results in the source patches, and tarballs landing in ~/rpmbuild/SOURCES
86      and the spec files landing in ~/rpmbuild/SPECS.  You can also
87      manually get individual SRPMs for a package by doing this (these
88      steps work fine as a mortal user, including the 'rpm -i'):
89      * yumdownloader --source [PACKAGE]
90        # That deposits [PACKAGE]-[VER]-[RELEASE].src.rpm in the current dir
91      * rpm -i [PACAKGE]-[VER]-[RELEASE].src.rpm
92        # That unpacks the SRPM, placing the source tarball and patches in
93        # ~/rpmbuild/SOURCES and the spec file in ~/rpmbuild/SPECS; it
94        # does *not* globally install anything, and doesn't require root
95      If you prefer to not install the file, you can simply extract it
96      into a directory by running:
97      * /mit/ghudson/scripts/rpmx [PACKAGE]-[VER]-[RELEASE].src.rpm
98
99    * If you develop a patch to the upstream source, you should save a
100      diff with your changes and add it to the repo as
101      SVN/server/common/patches/[PACKAGE]-[SHORT_DESCRIPTIVE_STRING].patch
102
103    * To cause your patch to be applied when the package is built, you
104      will need to save a copy of the original spec file for the upstream
105      package, then modify it to add a line like:
106        Patch[NUM]: [PACKAGE]-[SHORT_DESCRIPTOVE_STRING].patch
107        # This should generally go after the last existing Patch line
108        # in the file, and [NUM] should be significantly larger than
109        # the upstream Fedora patches, to avoid conflicts later.  This
110        # line tells rpmbuild where the contents of the patch live.
111      You also add a line like:
112        %patch[NUM] -p1 -b .[SHORT_DESCRIPTIVE_STRING]
113        # This should generally go after the last existing %patch line
114        # in the file, [NUM] should be the same as in the Patch line, and
115        # tells rpmbuild that this is the point at which to actually apply
116        # the patch
117
118    * The Release tag in the spec file should have ".scripts.%{scriptsversion}
119      inserted into it just before %{?dist}, or at the end of the release
120      if %{?dist} is unused.
121      # e.g.          Release: 1%{?dist}
122      # changes to    Release: 1.scripts.%{scriptsversion}%{?dist}
123      This causes the package version to include the string "scripts"
124      and our SVN revision number (which is set by the Makefile) for
125      easy identification (this version will also be greater than the
126      upstream version, so the system will prefer to update to it).
127
128    * If the scriptsified version of the package needs to be installed
129      on the servers, and a new upstream version would break scripts
130      without our changes, add a line like this:
131        Provides: scripts-[PACKAGE]
132      and correspondingly, add "scripts-[PACKAGE]" to the Requires line
133      in SVN/server/fedora/specs/scripts-base.spec (and remember to
134      build, upload, and deploy a new scripts-base package)
135
136    * Though we're not always good about it, do feel encouraged to add
137      an entry at the top of the %changelog section near the bottom of
138      the spec file explaining your modifications
139
140    * When you're finished with the updates to the upstream spec file,
141      create a diff from the upstream spec file to your new version,
142      and add it to the SVN repo as
143        SVN/server/fedora/specs/[PACKAGE].spec.patch
144      Make sure to copy it there before you try to build the package,
145      since if you don't mock will use the original specfile (and
146      overwrite any changes you made in place).
147
148Replacing the source of packages
149===============================
150
151    * Patch the specfile to have an alternate Source0 (or SourceX) URL
152      pointing to the updated source of the package.  You will then
153      need to add a spectool line to the Makefile to ensure this new
154      source gets downloaded on build:
155        spectool -g -R $(specs)/PACKAGE-NAME.spec
156
157Tips
158====
159
160    * Don't try to build a 32-bit package without building the 64-bit
161      package as well.
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