expand README

README.md

@@ -1,3 +1,6 @@
+Standalone
+----------
+
 Use `fatrace` to record all file access during an `sbuild` run and find those
 build dependencies which have their files never needed. You need superuser
 privileges to run this script because of `fatrace`.
@@ -20,6 +23,9 @@ which can be added to sbuild by applying
 Any unused dependencies can then be found by investigating the file
 `unneededdepends.list`.
 
+Batch
+-----
+
 The process can be automated for multiple packages by passing `dsc` files to
 `run.sh`:
 
@@ -34,14 +40,34 @@ stored in `*.unusedbd.real` files for each `dsc` file in the current directory.
 The `run.sh` script expects to find `findunusedbd.sh` directly under `/home`.
 Best try this out in a chroot to not mess with the host system.
 
-Customize the schroot:
+Schroot setup
+-------------
+
+Create the schroot:
+
+	$ sudo sbuild-createchroot --make-sbuild-tarball=/var/lib/sbuild/sid-amd64.tar.gz sid `mktemp -d` http://127.0.0.1:3142/snapshot.debian.org/archive/debian/20140601T000000Z
+
+Enter the schroot:
 
 	$ sbuild-shell source:sid-amd64-sbuild
+
+Make apt ignore the `Valid-Until` header:
+
 	$ echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/80-nocheckvaliduntil
+
+Install `equivs`:
+
 	$ apt-get install equivs --no-install-recommends
 
+Bugs
+----
 
-Bugs:
  - when investigating which build dependencies are unused, virtual packages are not taken into account
  - maybe the fake equivs package can be built outside the schroot to avoid the additional dependencies for installing equivs
  - maybe equivs can be avoided altogether by finding a way to edit debian/control on the fly
+
+License
+-------
+
+Consider everything in this repository in the public domain. It is a gross hack
+and I do not care what you do with it.