get-revision.sh

#!/bin/bash

GITCMD=git

# First, check if git is available at all...
type $GITCMD > /dev/null 2>&1
DIFFCODE=$?
if [[ "$DIFFCODE" -ne 0 ]]
then
  echo "ERROR: Git not found."
  exit 1
fi

# Run git diff to check for local changes. 
# Return code 0 indicates no changes, 1 indicates changes are present.
# Exit code 129 is an error when not inside a Git repo. 
# Use code 129 to avoid errors for the describe and log commands.
$GITCMD diff --quiet 2> /dev/null
DIFFCODE=$?

if [[ "$DIFFCODE" -ne 129 ]]
then
  FULLHASH=`$GITCMD rev-parse HEAD`
  DESC=`$GITCMD describe --always --tag`
  BRANCH=`$GITCMD rev-parse --abbrev-ref HEAD | tr '\n' ' ' | sed -e 's/ *$//'`
  LOCALCHANGED=${DIFFCODE}
  LOCALCHANGES=`$GITCMD diff --stat`
else
  FULLHASH="unknown"
  DESC="exported"
  BRANCH="exported"
  LOCALCHANGED=-1
  LOCALCHANGES=""
fi

echo "// Written in the D programming language."
echo
echo "/**"
echo "   Immutable variables that hold git revision information."
echo "   This file has been automatically generated by \$(D $0)."
echo

# Code for revision.d
read -d '' DVARS <<EOF

   Copyright: Stefan Frijters 2011-2015

   License: \$(HTTP www.gnu.org/licenses/gpl-3.0.txt, GNU General Public License, version 3 (GPL-3.0)).

   Authors: Stefan Frijters
*/

module dlbc.revision;

static immutable {

/**
   Full hash of the git revision: \$(D git rev-parse HEAD).
*/
string revisionHash = \"$FULLHASH\";
/**
   Short description of the git revision: \$(D git describe --always --tag).
*/
string revisionDesc = \"$DESC\";
/**
   Git branch: \$(D git rev-parse --abbrev-ref HEAD).
*/
string revisionBranch = \"$BRANCH\";
/**
   Exit code of \$(D git diff).
*/
int    revisionChanged = $LOCALCHANGED;
/**
   List of changed files compared to HEAD: \$(D git diff --stat)
*/
string revisionChanges = \"$LOCALCHANGES\";

/**
   This string exists as a string literal to be able to use
   the 'strings' command to retrieve the version of the executable,
   even when it cannot be run on the current platform:
   \$(D strings dlbc | grep "DLBC VERSION")
*/
string revisionString = \"DLBC VERSION $DESC $BRANCH $LOCALCHANGED\";

}

EOF

echo "$DVARS"