Include git sha in prompt if available

The sha will only be included if there is no tag
starting with OTP_R* associated with the sha. This
is because we do not want the sha to show on offical
releases.

1 files changed, 40 insertions, 0 deletions

diff --git a/erts/emulator/utils/gen_git_version b/erts/emulator/utils/gen_git_version
new file mode 100755
index 0000000000..d93a97cbbb
--- /dev/null
+++ b/erts/emulator/utils/gen_git_version
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+OUTPUT_FILE=$1
+
+if command -v git 2>&1 >/dev/null &&
+    test -d $ERL_TOP/.git -o -f $ERL_TOP/.git
+then
+    VSN=`git describe --match "OTP_R[0-9][0-9][A-B]*" HEAD`
+    case "$VSN" in
+	OTP_R*-g*) 
+	    VSN=`echo $VSN | sed -e 's/.*-g\\(.*\\)/\\1/g'` ;;
+	*)  VSN="na" ;;
+    esac
+else
+    VSN="na"
+fi
+
+
+# Only update the file if there has been a change to
+# the version number.
+if test -r $OUTPUT_FILE
+then
+	VC=`sed -n -e 's/^.*"\\\\"\\(.*\\)\\\\"".*/\\1/p' < $OUTPUT_FILE`
+else
+	VC=unset
+fi
+echo "VSN = $VSN"
+echo "VC = $VC"
+if test "$VSN" != "$VC"
+then
+    echo "# Automatically generated by $0 - DO NOT EDIT." > $OUTPUT_FILE
+    if test "$VSN" = "na"
+    then
+	echo "# GIT_VSN=-DERLANG_GIT_VERSION=\"\\\"$VSN\\\"\"" >> $OUTPUT_FILE
+    else
+	echo "GIT_VSN=-DERLANG_GIT_VERSION=\"\\\"$VSN\\\"\"" >> $OUTPUT_FILE
+    fi
+    exit 0
+fi
+exit 1
\ No newline at end of file