3 files changed, 137 insertions, 0 deletions
diff --git a/scripts/checkout b/scripts/checkout
new file mode 100755
index 0000000..ec892b3
--- /dev/null
+++ b/scripts/checkout
@@ -0,0 +1,9 @@
+#!/bin/sh
+# (C) 2016-10-25 Yong-iL Joh
+# License: MPLv2
+
+export LANG=C
+MYDIR=$(dirname "$0")
+
+$MYDIR/checkout_layer_hash.sh poky
+$MYDIR/checkout_layer_hash.sh meta-openembedded
diff --git a/scripts/checkout_layer_hash.sh b/scripts/checkout_layer_hash.sh
new file mode 100755
index 0000000..a00dda4
--- /dev/null
+++ b/scripts/checkout_layer_hash.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+# (C) 2015-12-12 Gunnar Andersson
+# (C) 2016-10-25 Yong-iL Joh
+# License: MPLv2
+
+fail() {
+   echo "FAILED."
+   [ -n "$1" ] && echo "Message: " $@
+   exit 1
+}
+
+# Store the location of these scripts
+_DIR=$(dirname "$0")
+META_IVI=$(readlink -f $_DIR/..)
+MYDIR=$(readlink -f $_DIR)
+
+layer=$1
+[ -z "$layer" ] && fail "No layer name given"
+
+# Extract revision from README in meta-ivi
+cd "$META_IVI" || fail "Can't cd to meta-ivi directory"
+revision=$($MYDIR/get_layer_info_from_README.sh $layer revision)
+uri=$($MYDIR/get_layer_info_from_README.sh $layer URI)
+
+# Fail if we could not fetch revision
+[ -z "$revision" ] && fail "Revision extracted from README was empty"
+
+# Checkout the right revision in this layer
+if [ ! -d "$META_IVI/../$layer/.git" ]; then
+   if [ -e "$META_IVI/../$layer" ]; then
+      rm -rf "$META_IVI/../$layer"
+   else
+      cd "$META_IVI/.."
+      git clone $uri
+   fi
+fi
+cd "$META_IVI/../$layer" || fail "Can't cd to layer directory ($layer)"
+git checkout $revision
diff --git a/scripts/get_layer_info_from_README.sh b/scripts/get_layer_info_from_README.sh
new file mode 100755
index 0000000..25bc9b2
--- /dev/null
+++ b/scripts/get_layer_info_from_README.sh
@@ -0,0 +1,90 @@
+#!/bin/sh
+# (C) Gunnar Andersson 2015-12-12
+# License: MPLv2
+
+# This fetches information about layer dependencies
+# as documented in meta-ivi README.
+# revision, branch name, or sub layer name can be extracted
+
+README=README.md
+DEBUG=false
+
+layer=$1
+what=$2
+
+[ -z "$layer" -o -z "$what" ] && { echo "Usage: $0 <layername> <branch|revision>" ; exit 1 ; }
+
+fail() {
+   echo "*** FAILED ***"
+   [ -n "$1" ] && echo "Message: " $@
+   exit 1
+}
+
+sanity_check_num_lines() {
+   what=$1 ; min=$2 ; max=$3
+
+   numlines="$(wc -l)" # < Reads from stdin
+
+   if [ $numlines -lt $min ] ; then 
+      fail "Sanity check: It looks like section $what has $numlines lines, and that is not enough.  Please check what is wrong."
+   fi
+
+   if [ $numlines -gt $max ] ; then
+      fail "Sanity check: It looks like section $what has $numlines lines, and that is more than expected.  Please check what is wrong."
+   fi
+}
+
+[ -f ./$README ] || fail "Cannot find README.md.  (Current directory is $PWD)"
+
+# Extract relevant section of the README
+dependency_section=$( <$README \
+                      sed -n '/Layer Dependencies/,/known to work/p' |\
+                      egrep 'URI:|branch:|layer:|revision:')
+
+# Debug printouts...
+$DEBUG && echo "OK, found the following layer info in dependency section:"
+$DEBUG && cat <<EOT
+$dependency_section
+EOT
+
+cat <<EOT | sanity_check_num_lines "Layer Dependencies Section" 6 20
+$dependency_section
+EOT
+
+# Get only this layer's information
+layer_info=$(
+cat <<EOT | sed -n "/URI:.*$layer/,/URI:/p" | sed 's/> //' | head -4
+$dependency_section
+EOT
+)
+
+# Get value for item "what"
+value=$(
+cat <<EOT | grep "$what" | awk '{print $2}'
+$layer_info
+EOT
+)
+
+# Check again - now only one line expected...
+cat <<EOT | sanity_check_num_lines "$what information for $layer" 1 1
+$value
+EOT
+
+# OK, this should be it:
+echo $value
+
+
+# Example README format:
+# 
+#Layer Dependencies
+#------------------
+#
+#URI: git://git.yoctoproject.org/poky
+#> branch:   fido
+#> revision: eb4a134a60e3ac26a48379675ad6346a44010339
+#
+#URI: git://git.openembedded.org/meta-openembedded
+#> layer:    meta-oe
+#> branch:   fido
+#> revision: 5b0305d9efa4b5692cd942586fb7aa92dba42d59
+