[build] Add a script for installing db4

Instead of maintaining not-easily-tested instructions for building BerkeleyDB
in doc/build-unix.md, package the installation as a script in contrib/. This
allows shared usage from a number of contexts, e.g. Docker.

Thanks to @jonasschnelli, @laanwj for feedback.

1 files changed, 7 insertions, 24 deletions

diff --git a/doc/build-unix.md b/doc/build-unix.md
index 8a102abaea..5d3329e2cf 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -165,33 +165,16 @@ turned off by default.  See the configure options for upnp behavior desired:
 
 Berkeley DB
 -----------
-It is recommended to use Berkeley DB 4.8. If you have to build it yourself:
+It is recommended to use Berkeley DB 4.8. If you have to build it yourself,
+you can use [the installation script included in contrib/](contrib/install_db4.sh)
+like so
 
-```bash
-BITCOIN_ROOT=$(pwd)
-
-# Pick some path to install BDB to, here we create a directory within the bitcoin directory
-BDB_PREFIX="${BITCOIN_ROOT}/db4"
-mkdir -p $BDB_PREFIX
-
-# Fetch the source and verify that it is not tampered with
-wget 'http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz'
-echo '12edc0df75bf9abd7f82f821795bcee50f42cb2e5f76a6a281b85732798364ef  db-4.8.30.NC.tar.gz' | sha256sum -c
-# -> db-4.8.30.NC.tar.gz: OK
-tar -xzvf db-4.8.30.NC.tar.gz
-
-# Build the library and install to our prefix
-cd db-4.8.30.NC/build_unix/
-#  Note: Do a static build so that it can be embedded into the executable, instead of having to find a .so at runtime
-../dist/configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX
-make install
-
-# Configure Bitcoin Core to use our own-built instance of BDB
-cd $BITCOIN_ROOT
-./autogen.sh
-./configure LDFLAGS="-L${BDB_PREFIX}/lib/" CPPFLAGS="-I${BDB_PREFIX}/include/" # (other args...)
+```shell
+./contrib/install_db4.sh `pwd`
 ```
 
+from the root of the repository.
+
 **Note**: You only need Berkeley DB if the wallet is enabled (see the section *Disable-Wallet mode* below).
 
 Boost