NAME

       debrepro - reproducibility tester for Debian packages

SYNOPSIS

       debrepro [OPTIONS] [SOURCEDIR]

DESCRIPTION

       debrepro will build a given source directory twice, with a set of variations between the first and the
       second build, and compare the produced binary packages. If diffoscope is installed, it is used to compare
       non-matching binaries. If disorderfs is installed, it is used during the build to inject non-determinism
       in filesystem listing operations.

       SOURCEDIR must be a directory containing an unpacked Debian source package. If SOURCEDIR is omitted, the
       current directory is assumed.

OUTPUT DIRECTORY

       At the very end of a build, debrepro will inform the location of the output directory where the build
       artifacts can be found. In that directory, you will find:

       $OUTPUTDIR/first
           Contains  the  results  of  the  first  build, including a copy of the source tree, and the resulting
           binary packages.

       $OUTPUTDIR/first/build.sh
           Contains the exact build script that was used in the first build.

       $OUTPUTDIR/second
           Contains the results of the second build, including a copy of the  source  tree,  and  the  resulting
           binary packages.

       $OUTPUTDIR/second/build.sh
           Contains the exact build script that was used in the second build.

       Taking  a diff(1) between $OUTPUTDIR/first/build.sh and $OUTPUTDIR/second/build.sh is an excellent way of
       figuring out exactly what changed between the two builds.

SUPPORTED VARIATIONS

       user
           The $USER environment variable will contain different values between the first and second builds.

       path
           During the second build, a fake, non-existing directory will be appended  to  the  $PATH  environment
           variable.

       umask
           The builds will use different umask settings.

       locale
           Both $LC_ALL and $LANG will be different across the two builds.

       timezone
           $TZ will be different across builds.

       filesystem-ordering
           If  disorderfs is installed, both builds will be done under a disorderfs overlay directory. This will
           cause filesystem listing operations to be return items in a non-deterministic order.

       time
           The second build will be executed 213 days, 7 hours and 13 minutes in the future with regards to  the
           current time (using faketime(1)).

OPTIONS

       -s VARIATION, --skip VARIATION
           Don't  perform the named VARIATION. Variation names are the ones used in their description in section
           SUPPORTED VARIATIONS.

       -b COMMAND, --before-second-build COMMAND
           Run COMMAND before performing the second build. This can be used for example to apply a  patch  to  a
           source tree for the second build, and check whether (or how) the resulting binaries are affected.

           Examples:

             $ debrepro --before-second-build "git checkout branch-with-changes"

             $ debrepro --before-second-build "patch -p1 < /path/to/patch"

       -t TIME, --timeout TIME
           Apply a timeout to all builds. TIME must be a time specification compatible with GNU timeout(1).

       -h, --help
           Display this help message and exit.

EXIT STATUS

       0   Package is reproducible.

           Reproducible  here means that the two builds produced the exactly the same binaries, under the set of
           variations that debrepro tests. Other sources of non-determinism in builds that are  not  yet  tested
           might still affect builds in the wild.

       1   Package is not reproducible.

       2   The given input is not a valid Debian source package.

       3   Required programs are missing.

SEE ALSO

       diffoscope (1), disorderfs (1), timeout(1)

AUTHOR

       Antonio Terceiro <terceiro@debian.org>.

Debian Utilities                                   2022-01-23                                        DEBREPRO(1)