RP

   1 #!/bin/sh
   2 # Replace patch series
   3
   4 usage="$0 branch [base-branch] <patchfile"
   5
   6 if test -d .dotest
   7 then
   8         echo >&2 "still in the middle of rebase/am"
   9         exit 1
  10 fi
  11
  12 case "$#,$1" in
  13 1,--continue)
  14         ;;
  15 *)
  16         rm -f .rp-state
  17         target_branch="$1"
  18         case $# in
  19         1)
  20                 base_branch=master
  21                 ;;
  22         2)
  23                 base_branch=$(git rev-parse --verify "$2") || exit
  24                 ;;
  25         *)
  26                 echo >&2 "$usage"
  27                 exit 1
  28                 ;;
  29         esac
  30
  31         # find branch point
  32         branch_point=$(git merge-base "$base_branch" "$target_branch") || {
  33                 echo >&2 "failed to compute the branch point"
  34                 exit 1
  35         }
  36
  37         # safety -- never rewind/replace what's merged to next
  38         in_branch=$(git rev-list $branch_point..$target_branch) &&
  39         not_in_next=$(git rev-list $branch_point..$target_branch ^next) &&
  40         test "z$in_branch" = "z$not_in_next" || {
  41                 echo >&2 "should not be rewinding part of $target_branch that is already in next"
  42                 exit 1
  43         }
  44
  45         # detach the HEAD
  46         git checkout "$branch_point" || {
  47                 echo >&2 "detaching the head at $branch_point"
  48                 exit 1
  49         }
  50
  51         {
  52                 echo "target_branch=$target_branch"
  53                 echo "branch_point=$branch_point"
  54         } >.rp-state
  55         # apply patches
  56         git am -3 -s -u || {
  57                 echo >&2 "finish the am and say $0 --continue"
  58                 exit 1
  59         }
  60         ;;
  61 esac
  62
  63 branch_point=$(sed -ne 's/^branch_point=//p' .rp-state) &&
  64 target_branch=$(sed -ne 's/^target_branch=//p' .rp-state) || {
  65         echo >&2 "no replace-patch session"
  66         exit 1
  67 }
  68 rm -f .rp-state
  69
  70 git branch -f "$target_branch" HEAD
  71 git checkout "$target_branch"
  72 git -p show-branch "$target_branch@{1}" "$target_branch"
  73 git diff --stat -p "$target_branch@{1}" "$target_branch"