debrepro(1)

1DEBREPRO(1)                                                        DEBREPRO(1)
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NAME

6       debrepro - reproducibility tester for Debian packages
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SYNOPSIS

9       debrepro [OPTIONS] [SOURCEDIR]
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DESCRIPTION

12       debrepro will build a given source directory twice, with a set of
13       variations between the first and the second build, and compare the
14       produced binary packages. If diffoscope is installed, it is used to
15       compare non-matching binaries. If disorderfs is installed, it is used
16       during the build to inject non-determinism in filesystem listing
17       operations.
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19       SOURCEDIR must be a directory containing an unpacked Debian source
20       package. If SOURCEDIR is omitted, the current directory is assumed.
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OUTPUT DIRECTORY

23       At the very end of a build, debrepro will inform the location of the
24       output directory where the build artifacts can be found. In that
25       directory, you will find:
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27       $OUTPUTDIR/first
28           Contains the results of the first build, including a copy of the
29           source tree, and the resulting binary packages.
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31       $OUTPUTDIR/first/build.sh
32           Contains the exact build script that was used in the first build.
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34       $OUTPUTDIR/second
35           Contains the results of the second build, including a copy of the
36           source tree, and the resulting binary packages.
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38       $OUTPUTDIR/second/build.sh
39           Contains the exact build script that was used in the second build.
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41       Taking a diff(1) between $OUTPUTDIR/first/build.sh and
42       $OUTPUTDIR/second/build.sh is an excellent way of figuring out exactly
43       what changed between the two builds.
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SUPPORTED VARIATIONS

46       user
47           The $USER environment variable will contain different values
48           between the first and second builds.
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50       path
51           During the second build, a fake, non-existing directory will be
52           appended to the $PATH environment variable.
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54       umask
55           The builds will use different umask settings.
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57       locale
58           Both $LC_ALL and $LANG will be different across the two builds.
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60       timezone
61           $TZ will be different across builds.
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63       filesystem-ordering
64           If disorderfs is installed, both builds will be done under a
65           disorderfs overlay directory. This will cause filesystem listing
66           operations to be return items in a non-deterministic order.
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68       time
69           The second build will be executed 213 days, 7 hours and 13 minutes
70           in the future with regards to the current time (using faketime(1)).
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OPTIONS

73       -s VARIATION, --skip VARIATION
74           Don't perform the named VARIATION. Variation names are the ones
75           used in their description in section SUPPORTED VARIATIONS.
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77       -b COMMAND, --before-second-build COMMAND
78           Run COMMAND before performing the second build. This can be used
79           for example to apply a patch to a source tree for the second build,
80           and check whether (or how) the resulting binaries are affected.
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82           Examples:
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84             $ debrepro --before-second-build "git checkout branch-with-changes"
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86             $ debrepro --before-second-build "patch -p1 < /path/to/patch"
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88       -t TIME, --timeout TIME
89           Apply a timeout to all builds. TIME must be a time specification
90           compatible with GNU timeout(1).
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92       -h, --help
93           Display this help message and exit.
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EXIT STATUS

96       0   Package is reproducible.
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98           Reproducible here means that the two builds produced the exactly
99           the same binaries, under the set of variations that debrepro tests.
100           Other sources of non-determinism in builds that are not yet tested
101           might still affect builds in the wild.
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103       1   Package is not reproducible.
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105       2   The given input is not a valid Debian source package.
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107       3   Required programs are missing.
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AUTHOR

113       Antonio Terceiro <terceiro@debian.org>.
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117Debian Utilities                  2022-01-25                       DEBREPRO(1)