# phpman > man > debrepro(1)

[DEBREPRO(1)](https://www.chedong.com/phpMan.php/man/DEBREPRO/1/markdown)                                                                              [DEBREPRO(1)](https://www.chedong.com/phpMan.php/man/DEBREPRO/1/markdown)



## 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)](https://www.chedong.com/phpMan.php/man/diff/1/markdown)** 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)](https://www.chedong.com/phpMan.php/man/faketime/1/markdown)**).

## 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)](https://www.chedong.com/phpMan.php/man/timeout/1/markdown).

### -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)](https://www.chedong.com/phpMan.php/man/timeout/1/markdown)

## AUTHOR
       Antonio Terceiro <<terceiro@debian.org>>.



Debian Utilities                             2026-03-04                                  [DEBREPRO(1)](https://www.chedong.com/phpMan.php/man/DEBREPRO/1/markdown)