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Diffstat (limited to 'docs/developer/build-run-debug')
| -rw-r--r-- | docs/developer/build-run-debug/building.rst | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/docs/developer/build-run-debug/building.rst b/docs/developer/build-run-debug/building.rst index 9e9e79db376..6106a710d28 100644 --- a/docs/developer/build-run-debug/building.rst +++ b/docs/developer/build-run-debug/building.rst @@ -256,6 +256,44 @@ To build the debian packages, use the following command: $ make pkg-deb +Reproducible builds on Debian +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +By default the VPP artifacts have various bits of +information in them aimed at simplifying the identification +during the development (like, the user name that built +the package as well as the build times). By setting +a few environment variables one can obtain bit-identical +.deb files, assuming that the prerequisites installed +in the build environment are identical. + + +Setting and using the SOURCE_DATE_EPOCH variable +(see https://reproducible-builds.org/docs/source-date-epoch/) +takes care of most of the magic necessary. + +The package vpp-ext-deps is already being built with that +date set to date of the last modification of the +build/external/ tree +(similar to deriving the "number of commits" for the package +versioning of vpp-ext-deps) + +For the rest of the packages, pinning the following +three variables should result in bit-identical +artifacts across multiple runs in the build environment: + + .. code-block:: console + + export SOURCE_DATE_EPOCH=$(date +%s) + export VPP_BUILD_HOST="buildhost" + export VPP_BUILD_USER="builduser" + +If you want to reproduce the bit-identical builds across +different environments, take a look at "vpp_<BUILD_VERSION>.buildinfo" file +which gets created in build-root alongside the .deb repositories - +it has the cryptographic hashes for the newly built packages, and +the full list of build dependencies and their versions. + .. _rpmpackages: Building RPM Packages |