git-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 USAGE='[-v] [--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=$GIT_DIR/.dotest-merge
  41 prec=4
  42 verbose=
  43
  44 continue_merge () {
  45         test -n "$prev_head" || die "prev_head must be defined"
  46         test -d "$dotest" || die "$dotest directory does not exist"
  47
  48         unmerged=$(git-ls-files -u)
  49         if test -n "$unmerged"
  50         then
  51                 echo "You still have unmerged paths in your index"
  52                 echo "did you forget update-index?"
  53                 die "$RESOLVEMSG"
  54         fi
  55
  56         if test -n "`git-diff-index HEAD`"
  57         then
  58                 if ! git-commit -C "`cat $dotest/current`"
  59                 then
  60                         echo "Commit failed, please do not call \"git commit\""
  61                         echo "directly, but instead do one of the following: "
  62                         die "$RESOLVEMSG"
  63                 fi
  64                 printf "Committed: %0${prec}d" $msgnum
  65         else
  66                 printf "Already applied: %0${prec}d" $msgnum
  67         fi
  68         echo ' '`git-rev-list --pretty=oneline -1 HEAD | \
  69                                 sed 's/^[a-f0-9]\+ //'`
  70
  71         prev_head=`git-rev-parse HEAD^0`
  72         # save the resulting commit so we can read-tree on it later
  73         echo "$prev_head" > "$dotest/prev_head"
  74
  75         # onto the next patch:
  76         msgnum=$(($msgnum + 1))
  77         echo "$msgnum" >"$dotest/msgnum"
  78 }
  79
  80 call_merge () {
  81         cmt="$(cat $dotest/cmt.$1)"
  82         echo "$cmt" > "$dotest/current"
  83         git-merge-$strategy "$cmt^" -- HEAD "$cmt"
  84         rv=$?
  85         case "$rv" in
  86         0)
  87                 return
  88                 ;;
  89         1)
  90                 test -d "$GIT_DIR/rr-cache" && git-rerere
  91                 die "$RESOLVEMSG"
  92                 ;;
  93         2)
  94                 echo "Strategy: $rv $strategy failed, try another" 1>&2
  95                 die "$RESOLVEMSG"
  96                 ;;
  97         *)
  98                 die "Unknown exit code ($rv) from command:" \
  99                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
 100                 ;;
 101         esac
 102 }
 103
 104 finish_rb_merge () {
 105         rm -r "$dotest"
 106         echo "All done."
 107 }
 108
 109 while case "$#" in 0) break ;; esac
 110 do
 111         case "$1" in
 112         --continue)
 113                 diff=$(git-diff-files)
 114                 case "$diff" in
 115                 ?*)     echo "You must edit all merge conflicts and then"
 116                         echo "mark them as resolved using git update-index"
 117                         exit 1
 118                         ;;
 119                 esac
 120                 if test -d "$dotest"
 121                 then
 122                         prev_head="`cat $dotest/prev_head`"
 123                         end="`cat $dotest/end`"
 124                         msgnum="`cat $dotest/msgnum`"
 125                         onto="`cat $dotest/onto`"
 126                         continue_merge
 127                         while test "$msgnum" -le "$end"
 128                         do
 129                                 call_merge "$msgnum"
 130                                 continue_merge
 131                         done
 132                         finish_rb_merge
 133                         exit
 134                 fi
 135                 git am --resolved --3way --resolvemsg="$RESOLVEMSG" \
 136                         --reflog-action=rebase
 137                 exit
 138                 ;;
 139         --skip)
 140                 if test -d "$dotest"
 141                 then
 142                         prev_head="`cat $dotest/prev_head`"
 143                         end="`cat $dotest/end`"
 144                         msgnum="`cat $dotest/msgnum`"
 145                         msgnum=$(($msgnum + 1))
 146                         onto="`cat $dotest/onto`"
 147                         while test "$msgnum" -le "$end"
 148                         do
 149                                 call_merge "$msgnum"
 150                                 continue_merge
 151                         done
 152                         finish_rb_merge
 153                         exit
 154                 fi
 155                 git am -3 --skip --resolvemsg="$RESOLVEMSG" \
 156                         --reflog-action=rebase
 157                 exit
 158                 ;;
 159         --abort)
 160                 if test -d "$dotest"
 161                 then
 162                         rm -r "$dotest"
 163                 elif test -d .dotest
 164                 then
 165                         rm -r .dotest
 166                 else
 167                         die "No rebase in progress?"
 168                 fi
 169                 git reset --hard ORIG_HEAD
 170                 exit
 171                 ;;
 172         --onto)
 173                 test 2 -le "$#" || usage
 174                 newbase="$2"
 175                 shift
 176                 ;;
 177         -M|-m|--m|--me|--mer|--merg|--merge)
 178                 do_merge=t
 179                 ;;
 180         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 181                 --strateg=*|--strategy=*|\
 182         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 183                 case "$#,$1" in
 184                 *,*=*)
 185                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 186                 1,*)
 187                         usage ;;
 188                 *)
 189                         strategy="$2"
 190                         shift ;;
 191                 esac
 192                 do_merge=t
 193                 ;;
 194         -v|--verbose)
 195                 verbose=t
 196                 ;;
 197         -*)
 198                 usage
 199                 ;;
 200         *)
 201                 break
 202                 ;;
 203         esac
 204         shift
 205 done
 206
 207 # Make sure we do not have .dotest
 208 if test -z "$do_merge"
 209 then
 210         if mkdir .dotest
 211         then
 212                 rmdir .dotest
 213         else
 214                 echo >&2 '
 215 It seems that I cannot create a .dotest directory, and I wonder if you
 216 are in the middle of patch application or another rebase.  If that is not
 217 the case, please rm -fr .dotest and run me again.  I am stopping in case
 218 you still have something valuable there.'
 219                 exit 1
 220         fi
 221 else
 222         if test -d "$dotest"
 223         then
 224                 die "previous dotest directory $dotest still exists." \
 225                         'try git-rebase < --continue | --abort >'
 226         fi
 227 fi
 228
 229 # The tree must be really really clean.
 230 git-update-index --refresh || exit
 231 diff=$(git-diff-index --cached --name-status -r HEAD)
 232 case "$diff" in
 233 ?*)     echo "$diff"
 234         exit 1
 235         ;;
 236 esac
 237
 238 # The upstream head must be given.  Make sure it is valid.
 239 upstream_name="$1"
 240 upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 241     die "invalid upstream $upstream_name"
 242
 243 # If a hook exists, give it a chance to interrupt
 244 if test -x "$GIT_DIR/hooks/pre-rebase"
 245 then
 246         "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 247                 echo >&2 "The pre-rebase hook refused to rebase."
 248                 exit 1
 249         }
 250 fi
 251
 252 # If the branch to rebase is given, first switch to it.
 253 case "$#" in
 254 2)
 255         branch_name="$2"
 256         git-checkout "$2" || usage
 257         ;;
 258 *)
 259         branch_name=`git symbolic-ref HEAD` || die "No current branch"
 260         branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 261         ;;
 262 esac
 263 branch=$(git-rev-parse --verify "${branch_name}^0") || exit
 264
 265 # Make sure the branch to rebase onto is valid.
 266 onto_name=${newbase-"$upstream_name"}
 267 onto=$(git-rev-parse --verify "${onto_name}^0") || exit
 268
 269 # Now we are rebasing commits $upstream..$branch on top of $onto
 270
 271 # Check if we are already based on $onto, but this should be
 272 # done only when upstream and onto are the same.
 273 mb=$(git-merge-base "$onto" "$branch")
 274 if test "$upstream" = "$onto" && test "$mb" = "$onto"
 275 then
 276         echo >&2 "Current branch $branch_name is up to date."
 277         exit 0
 278 fi
 279
 280 if test -n "$verbose"
 281 then
 282         echo "Changes from $mb to $onto:"
 283         git-diff-tree --stat --summary "$mb" "$onto"
 284 fi
 285
 286 # Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
 287 git-reset --hard "$onto"
 288
 289 # If the $onto is a proper descendant of the tip of the branch, then
 290 # we just fast forwarded.
 291 if test "$mb" = "$branch"
 292 then
 293         echo >&2 "Fast-forwarded $branch_name to $onto_name."
 294         exit 0
 295 fi
 296
 297 if test -z "$do_merge"
 298 then
 299         git-format-patch -k --stdout --full-index --ignore-if-in-upstream "$upstream"..ORIG_HEAD |
 300         git am --binary -3 -k --resolvemsg="$RESOLVEMSG" \
 301                 --reflog-action=rebase
 302         exit $?
 303 fi
 304
 305 if test "@@NO_PYTHON@@" && test "$strategy" = "recursive-old"
 306 then
 307         die 'The recursive-old merge strategy is written in Python,
 308 which this installation of git was not configured with.  Please consider
 309 a different merge strategy (e.g. recursive, resolve, or stupid)
 310 or install Python and git with Python support.'
 311
 312 fi
 313
 314 # start doing a rebase with git-merge
 315 # this is rename-aware if the recursive (default) strategy is used
 316
 317 mkdir -p "$dotest"
 318 echo "$onto" > "$dotest/onto"
 319 prev_head=`git-rev-parse HEAD^0`
 320 echo "$prev_head" > "$dotest/prev_head"
 321
 322 msgnum=0
 323 for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
 324                         | @@PERL@@ -e 'print reverse <>'`
 325 do
 326         msgnum=$(($msgnum + 1))
 327         echo "$cmt" > "$dotest/cmt.$msgnum"
 328 done
 329
 330 echo 1 >"$dotest/msgnum"
 331 echo $msgnum >"$dotest/end"
 332
 333 end=$msgnum
 334 msgnum=1
 335
 336 while test "$msgnum" -le "$end"
 337 do
 338         call_merge "$msgnum"
 339         continue_merge
 340 done
 341
 342 finish_rb_merge