- bring in akpm's patch management scripts and a first cut at

[fs/lustre-release.git] / lustre / kernel_patches / scripts / extract_description

diff --git a/lustre/kernel_patches/scripts/extract_description b/lustre/kernel_patches/scripts/extract_description
new file mode 100755 (executable)
index 0000000..6fa0e68
--- /dev/null
+++ b/lustre/kernel_patches/scripts/extract_description
@@ -0,0 +1,87 @@
+#!/bin/sh
+
+insert_line()
+{
+       PATTERN="$1"
+       LINE="$2"
+       FILE="$3"
+       awk ' BEGIN { found=0; }
+               /'"$PATTERN"'/ { 
+                       print; 
+                       if (!found)
+                               printf("%s\n", "'$LINE'"); 
+                       found=1; 
+                       next;
+               }
+               { print; }
+       ' < "$FILE"
+}
+
+# extract the description from the top of a patch
+# filter stdin
+# collapse adjacent blank lines to a single blank line
+# remove any lines that look like diffstat output
+# stop output on encountering a line beginning with '---' (beginning of patch)
+
+       TMPFILE=`mktemp /tmp/xdtmp.XXXXXX` || exit 1
+       formail -kfcb -X 'From:' -X 'Subject:' |\
+       awk '
+               BEGIN { found_end=0; lastone="x"; }
+               /^ .* [|] +[0-9]+ [+-]+$/ { 
+                       #/* we found something like diffstat output... */
+                       if (found_end == 1) {
+                               /* we are past end of diffstat, let it pass */
+                               print;
+                       }
+                       next;
+               }
+               /^ [1-9][0-9]* files changed/ {
+                       #/* end of diffstat output, stop filtering diffstat */
+                       found_end=1;
+                       next;
+               }
+               /^--- / { exit; }
+               {
+                       #/* collapse adjacent blank lines to 1 blank line */ 
+                       if ( $0 == "" && lastone == "" )
+                               next;
+                       else 
+                               print; 
+                       lastone=$0;
+               }
+       ' | awk '{ if ($0 == "" && FNR == 1)  next; print; }' > "$TMPFILE"
+
+       descs=`head -10 $TMPFILE | grep -c '^[  ]*DESC[         ]*$'`
+       if [ "$descs" = "0" ]
+       then
+               # DESC is not 1st non blank line in the file
+               echo "DESC"
+               descs=0
+       fi
+       edescs=`grep -c '^EDESC$' "$TMPFILE"`
+       subjects=`grep -c '^[   ]*Subject[:]' "$TMPFILE"`
+       froms=`grep -c '^[      ]*From[:]' "$TMPFILE"`
+       if [ "$edescs" = "0" ]
+       then
+               if [ "$subjects" != "0" ]
+               then
+                       insert_line '^Subject[:]' 'EDESC' "$TMPFILE"
+               else
+                       if [ "$froms" != "0" ]
+                       then
+                               insert_line '^From[:]' 'EDESC' "$TMPFILE"
+                       else
+                               if [ "$descs" = "0" ]
+                               then
+                                       # blank DESC line...
+                                       echo '(undescribed patch)'
+                                       echo EDESC
+                                       cat "$TMPFILE"
+                               else
+                                       insert_line '^DESC$' "EDESC" "$TMPFILE"
+                               fi
+                       fi
+               fi
+       else
+               cat $TMPFILE
+       fi