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48 lines
2.1 KiB
Markdown
48 lines
2.1 KiB
Markdown
Use `fatrace` to record all file access during an `sbuild` run and find those
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build dependencies which have their files never needed. You need superuser
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privileges to run this script because of `fatrace`.
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Run it like follows. In one terminal execute:
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$ ./findunusedbd.sh
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In another run sbuild like this:
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$ sbuild \
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--chroot-setup-commands='/home/user/path/to/findunusedbd.sh chroot-setup' \
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--pre-realbuild-commands='/home/user/path/to/findunusedbd.sh pre-realbuild' \
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--post-realbuild-commands='/home/user/path/to/findunusedbd.sh post-realbuild'
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This needs the --pre-realbuild-commands and --post-realbuild-commands to exist
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which can be added to sbuild by applying
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`0001-add-pre-realbuild-commands-and-post-realbuild-comman.patch` to it.
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Any unused dependencies can then be found by investigating the file
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`unneededdepends.list`.
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The process can be automated for multiple packages by passing `dsc` files to
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`run.sh`:
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$ ./run.sh ../mysources/*.dsc
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This script will put the successful builds in `buildsuccess.list` and the found
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unused build dependencies as `*.unusedbd` for each `dsc` file in the current
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directory. A second pass on the successfully built `dsc` files will then check
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each of the found unused build dependencies for their validity by replacing
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them by an empty equivs package one after another. The results of that run are
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stored in `*.unusedbd.real` files for each `dsc` file in the current directory.
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The `run.sh` script expects to find `findunusedbd.sh` directly under `/home`.
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Best try this out in a chroot to not mess with the host system.
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Customize the schroot:
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$ sbuild-shell source:sid-amd64-sbuild
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$ echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-nocheckvaliduntil
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$ apt-get install equivs --no-install-recommends
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Bugs:
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- when investigating which build dependencies are unused, virtual packages are not taken into account
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- maybe the fake equivs package can be built outside the schroot to avoid the additional dependencies for installing equivs
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- maybe equivs can be avoided altogether by finding a way to edit debian/control on the fly
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