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@ -3,43 +3,36 @@ Standalone
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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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privileges to run this script because of `fatrace`. You need to copy
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`findunusedbd.sh` into `/home` so best run all of this inside a chroot to
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prevent a mess.
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Run it like follows. In one terminal execute:
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Run it like follows:
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$ ./findunusedbd.sh
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$ ./run.sh foo.dsc bar.dsc [...]
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In another run sbuild like this:
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This will call sbuild like this for each `dsc` given:
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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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--chroot-setup-commands='/home/findunusedbd.sh chroot-setup' \
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--pre-realbuild-commands='/home/findunusedbd.sh pre-realbuild' \
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--post-realbuild-commands='/home/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 first pass will use `fatrace` to find build dependencies on packages with
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files that are never used during the whole build. Since many of these are gonna
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be meta packages, a second pass replaces the candidate package with a fake
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equivs package of same name and version but without dependencies and tries to
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rebuild.
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Batch
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-----
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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 with no dependencies one after another. The
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results of that run are stored in `*.unusedbd.real` files for each `dsc` file
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in the current directory. The `run.sh` script expects to find
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`findunusedbd.sh` directly under `/home`. Best try this out in a chroot to not
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mess with the host system.
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Both passes are done for `--arch-all` and `--no-arch-all`. Any unused
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dependencies can then be found by investigating the `*.arch-all.unusedbd.real`
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and `*.no-arch-all.unusedbd.real`. The result from the former can permanently
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be dropped from the `Build-Depends`. The result from the latter can be added to
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`Build-Depends-Indep`.
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Schroot setup
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-------------
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@ -65,6 +58,12 @@ 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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- fatrace suffers from [bug#722901](https://bugs.debian.org/722901)
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Feature Requests
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----------------
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- build with `DEB_BUILD_OPTIONS=nocheck` once it is possible to add `<!profile.nocheck>`
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License
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-------
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josch
10 years ago