git-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 USAGE='[--onto <newbase>] <upstream> [<branch>]'
   7 LONG_USAGE='git-rebase replaces <branch> with a new branch of the
   8 same name.  When the --onto option is provided the new branch starts
   9 out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
  10 It then attempts to create a new commit for each commit from the original
  11 <branch> that does not exist in the <upstream> branch.
  12
  13 It is possible that a merge failure will prevent this process from being
  14 completely automatic.  You will have to resolve any such merge failure
  15 and run git rebase --continue.  Another option is to bypass the commit
  16 that caused the merge failure with git rebase --skip.  To restore the
  17 original <branch> and remove the .dotest working files, use the command
  18 git rebase --abort instead.
  19
  20 Note that if <branch> is not specified on the command line, the
  21 currently checked out branch is used.  You must be in the top
  22 directory of your project to start (or continue) a rebase.
  23
  24 Example:       git-rebase master~1 topic
  25
  26         A---B---C topic                   A'\''--B'\''--C'\'' topic
  27        /                   -->           /
  28   D---E---F---G master          D---E---F---G master
  29 '
  30 . git-sh-setup
  31
  32 RESOLVEMSG="
  33 When you have resolved this problem run \"git rebase --continue\".
  34 If you would prefer to skip this patch, instead run \"git rebase --skip\".
  35 To restore the original branch and stop rebasing run \"git rebase --abort\".
  36 "
  37 unset newbase
  38 strategy=recursive
  39 do_merge=
  40 dotest=$GIT_DIR/.dotest-merge
  41 prec=4
  42
  43 continue_merge () {
  44         test -n "$prev_head" || die "prev_head must be defined"
  45         test -d "$dotest" || die "$dotest directory does not exist"
  46
  47         unmerged=$(git-ls-files -u)
  48         if test -n "$unmerged"
  49         then
  50                 echo "You still have unmerged paths in your index"
  51                 echo "did you forget update-index?"
  52                 die "$RESOLVEMSG"
  53         fi
  54
  55         if test -n "`git-diff-index HEAD`"
  56         then
  57                 printf "Committed: %0${prec}d" $msgnum
  58                 git-commit -C "`cat $dotest/current`"
  59         else
  60                 printf "Already applied: %0${prec}d" $msgnum
  61         fi
  62         echo ' '`git-rev-list --pretty=oneline -1 HEAD | \
  63                                 sed 's/^[a-f0-9]\+ //'`
  64
  65         prev_head=`git-rev-parse HEAD^0`
  66         # save the resulting commit so we can read-tree on it later
  67         echo "$prev_head" > "$dotest/prev_head"
  68
  69         # onto the next patch:
  70         msgnum=$(($msgnum + 1))
  71         echo "$msgnum" >"$dotest/msgnum"
  72 }
  73
  74 call_merge () {
  75         cmt="$(cat $dotest/cmt.$1)"
  76         echo "$cmt" > "$dotest/current"
  77         git-merge-$strategy "$cmt^" -- HEAD "$cmt"
  78         rv=$?
  79         case "$rv" in
  80         0)
  81                 return
  82                 ;;
  83         1)
  84                 test -d "$GIT_DIR/rr-cache" && git-rerere
  85                 die "$RESOLVEMSG"
  86                 ;;
  87         2)
  88                 echo "Strategy: $rv $strategy failed, try another" 1>&2
  89                 die "$RESOLVEMSG"
  90                 ;;
  91         *)
  92                 die "Unknown exit code ($rv) from command:" \
  93                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
  94                 ;;
  95         esac
  96 }
  97
  98 finish_rb_merge () {
  99         rm -r "$dotest"
 100         echo "All done."
 101 }
 102
 103 while case "$#" in 0) break ;; esac
 104 do
 105         case "$1" in
 106         --continue)
 107                 diff=$(git-diff-files)
 108                 case "$diff" in
 109                 ?*)     echo "You must edit all merge conflicts and then"
 110                         echo "mark them as resolved using git update-index"
 111                         exit 1
 112                         ;;
 113                 esac
 114                 if test -d "$dotest"
 115                 then
 116                         prev_head="`cat $dotest/prev_head`"
 117                         end="`cat $dotest/end`"
 118                         msgnum="`cat $dotest/msgnum`"
 119                         onto="`cat $dotest/onto`"
 120                         continue_merge
 121                         while test "$msgnum" -le "$end"
 122                         do
 123                                 call_merge "$msgnum"
 124                                 continue_merge
 125                         done
 126                         finish_rb_merge
 127                         exit
 128                 fi
 129                 git am --resolved --3way --resolvemsg="$RESOLVEMSG"
 130                 exit
 131                 ;;
 132         --skip)
 133                 if test -d "$dotest"
 134                 then
 135                         prev_head="`cat $dotest/prev_head`"
 136                         end="`cat $dotest/end`"
 137                         msgnum="`cat $dotest/msgnum`"
 138                         msgnum=$(($msgnum + 1))
 139                         onto="`cat $dotest/onto`"
 140                         while test "$msgnum" -le "$end"
 141                         do
 142                                 call_merge "$msgnum"
 143                                 continue_merge
 144                         done
 145                         finish_rb_merge
 146                         exit
 147                 fi
 148                 git am -3 --skip --resolvemsg="$RESOLVEMSG"
 149                 exit
 150                 ;;
 151         --abort)
 152                 if test -d "$dotest"
 153                 then
 154                         rm -r "$dotest"
 155                 elif test -d .dotest
 156                 then
 157                         rm -r .dotest
 158                 else
 159                         die "No rebase in progress?"
 160                 fi
 161                 git reset --hard ORIG_HEAD
 162                 exit
 163                 ;;
 164         --onto)
 165                 test 2 -le "$#" || usage
 166                 newbase="$2"
 167                 shift
 168                 ;;
 169         -M|-m|--m|--me|--mer|--merg|--merge)
 170                 do_merge=t
 171                 ;;
 172         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 173                 --strateg=*|--strategy=*|\
 174         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 175                 case "$#,$1" in
 176                 *,*=*)
 177                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 178                 1,*)
 179                         usage ;;
 180                 *)
 181                         strategy="$2"
 182                         shift ;;
 183                 esac
 184                 do_merge=t
 185                 ;;
 186         -*)
 187                 usage
 188                 ;;
 189         *)
 190                 break
 191                 ;;
 192         esac
 193         shift
 194 done
 195
 196 # Make sure we do not have .dotest
 197 if test -z "$do_merge"
 198 then
 199         if mkdir .dotest
 200         then
 201                 rmdir .dotest
 202         else
 203                 echo >&2 '
 204 It seems that I cannot create a .dotest directory, and I wonder if you
 205 are in the middle of patch application or another rebase.  If that is not
 206 the case, please rm -fr .dotest and run me again.  I am stopping in case
 207 you still have something valuable there.'
 208                 exit 1
 209         fi
 210 else
 211         if test -d "$dotest"
 212         then
 213                 die "previous dotest directory $dotest still exists." \
 214                         'try git-rebase < --continue | --abort >'
 215         fi
 216 fi
 217
 218 # The tree must be really really clean.
 219 git-update-index --refresh || exit
 220 diff=$(git-diff-index --cached --name-status -r HEAD)
 221 case "$diff" in
 222 ?*)     echo "$diff"
 223         exit 1
 224         ;;
 225 esac
 226
 227 # The upstream head must be given.  Make sure it is valid.
 228 upstream_name="$1"
 229 upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 230     die "invalid upstream $upstream_name"
 231
 232 # If a hook exists, give it a chance to interrupt
 233 if test -x "$GIT_DIR/hooks/pre-rebase"
 234 then
 235         "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 236                 echo >&2 "The pre-rebase hook refused to rebase."
 237                 exit 1
 238         }
 239 fi
 240
 241 # If the branch to rebase is given, first switch to it.
 242 case "$#" in
 243 2)
 244         branch_name="$2"
 245         git-checkout "$2" || usage
 246         ;;
 247 *)
 248         branch_name=`git symbolic-ref HEAD` || die "No current branch"
 249         branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 250         ;;
 251 esac
 252 branch=$(git-rev-parse --verify "${branch_name}^0") || exit
 253
 254 # Make sure the branch to rebase onto is valid.
 255 onto_name=${newbase-"$upstream_name"}
 256 onto=$(git-rev-parse --verify "${onto_name}^0") || exit
 257
 258 # Now we are rebasing commits $upstream..$branch on top of $onto
 259
 260 # Check if we are already based on $onto, but this should be
 261 # done only when upstream and onto are the same.
 262 if test "$upstream" = "$onto"
 263 then
 264         mb=$(git-merge-base "$onto" "$branch")
 265         if test "$mb" = "$onto"
 266         then
 267                 echo >&2 "Current branch $branch_name is up to date."
 268                 exit 0
 269         fi
 270 fi
 271
 272 # Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
 273 git-reset --hard "$onto"
 274
 275 # If the $onto is a proper descendant of the tip of the branch, then
 276 # we just fast forwarded.
 277 if test "$mb" = "$onto"
 278 then
 279         echo >&2 "Fast-forwarded $branch to $newbase."
 280         exit 0
 281 fi
 282
 283 if test -z "$do_merge"
 284 then
 285         git-format-patch -k --stdout --full-index "$upstream"..ORIG_HEAD |
 286         git am --binary -3 -k --resolvemsg="$RESOLVEMSG"
 287         exit $?
 288 fi
 289
 290 if test "@@NO_PYTHON@@" && test "$strategy" = "recursive"
 291 then
 292         die 'The recursive merge strategy currently relies on Python,
 293 which this installation of git was not configured with.  Please consider
 294 a different merge strategy (e.g. octopus, resolve, stupid, ours)
 295 or install Python and git with Python support.'
 296
 297 fi
 298
 299 # start doing a rebase with git-merge
 300 # this is rename-aware if the recursive (default) strategy is used
 301
 302 mkdir -p "$dotest"
 303 echo "$onto" > "$dotest/onto"
 304 prev_head=`git-rev-parse HEAD^0`
 305 echo "$prev_head" > "$dotest/prev_head"
 306
 307 msgnum=0
 308 for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
 309                         | perl -e 'print reverse <>'`
 310 do
 311         msgnum=$(($msgnum + 1))
 312         echo "$cmt" > "$dotest/cmt.$msgnum"
 313 done
 314
 315 echo 1 >"$dotest/msgnum"
 316 echo $msgnum >"$dotest/end"
 317
 318 end=$msgnum
 319 msgnum=1
 320
 321 while test "$msgnum" -le "$end"
 322 do
 323         call_merge "$msgnum"
 324         continue_merge
 325 done
 326
 327 finish_rb_merge