guilt-rebase

   1 #!/bin/sh
   2 #
   3 # Copyright (c) Josef "Jeff" Sipek, 2007-2013
   4 #
   5 # Heavily based on the long removed sh version of git-cherry
   6 #
   7
   8 USAGE="<upstream>"
   9 if [ -z "$GUILT_VERSION" ]; then
  10         echo "Invoking `basename "$0"` directly is no longer supported." >&2
  11         exit 1
  12 fi
  13
  14 _main() {
  15
  16 disp "Beware, rebase is currently EXPERIMENTAL."
  17 disp "In other words, it might eat your patches."
  18 _disp "Do you wish to proceed? [y/N] "
  19 read n
  20 if [ "$n" != "y" -a "$n" != "Y" ]; then
  21         disp "Aborted."
  22         exit 0
  23 fi
  24
  25 case "$#" in
  26         1)
  27                 upstream=`git rev-parse --verify "$1"` &&
  28                 ours=`git rev-parse --verify HEAD` || usage
  29                 limit="$upstream"
  30                 ;;
  31         *)
  32                 usage
  33                 ;;
  34 esac
  35
  36 # make sure that there are no unapplied changes
  37 if ! must_commit_first; then
  38         die "Uncommited changes detected. Refresh first."
  39 elif [ `wc -l < "$applied"` -eq 0 ]; then
  40         die "Nothing to rebase. First, you need to push patches onto the stack."
  41 fi
  42
  43 # Note that these list commits in reverse order;
  44 # not that the order in inup matters...
  45 inup=`git rev-list ^$ours $upstream` &&
  46 ours=`git rev-list $ours ^$limit` || exit
  47
  48 rebase_dir="$GUILT_DIR/$branch/.rebase.$$"
  49 mkdir "$rebase_dir"
  50
  51 #
  52 # calculate the patch ids for all the commits in upstream
  53 #
  54 for c in $inup ; do
  55         git diff-tree -p $c
  56 done | git patch-id | while read id name ; do
  57         echo "$name" >> "$rebase_dir/$id"
  58 done
  59
  60 # backup the status file, so we don't have to do more work to figure out all
  61 # the patches that were pushed before we started rebasing
  62 cp "$applied" "$rebase_dir/status"
  63
  64 disp "First, poping all patches..."
  65 pop_all_patches
  66 git merge --no-commit $upstream > /dev/null 2> /dev/null
  67
  68 disp ""
  69 log=`git log -1 --no-decorate --pretty=oneline`
  70 disp "HEAD is now at `echo $log | cut -c 1-7`... `echo "$log" | cut -c 41-`"
  71
  72 #
  73 # For each previously applied patch:
  74 #       1) calculate the patchid
  75 #       2) if the patchid matches any of the upstream commits' patchids...
  76 #               a) comment out the patch from the series file
  77 #       3) else
  78 #               a) push the patch onto the stack
  79 #
  80 IFS=":"
  81 cat "$rebase_dir/status" | while read hash name; do
  82         disp ""
  83         IFS=" "
  84         cat "$GUILT_DIR/$branch/$name" | git patch-id |
  85                 while read patchid commitid ; do
  86                         disp "Applying '$name'"
  87                         if [ -f "$rebase_dir/$patchid" ]; then
  88                                 realcommit=`head_n 1 "$rebase_dir/$patchid"`
  89                                 disp "Matches upstream commit $realcommit"
  90                                 series_rename_patch "$name" "###rebased###$name"
  91                                 disp "Patch removed from series."
  92                         else
  93                                 # FIXME: use a guilt function instead
  94                                 guilt-push > /dev/null
  95                                 disp "Patch applied."
  96                         fi
  97                 done
  98         IFS=":"
  99 done
 100
 101 rm -rf "$rebase_dir"
 102
 103 disp ""
 104 disp "Done."
 105
 106 }