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 case "${GIT_USE_RECUR_FOR_RECURSIVE}" in
  39 '')
  40         strategy=recursive ;;
  41 ?*)
  42         strategy=recur ;;
  43 esac
  44
  45 do_merge=
  46 dotest=$GIT_DIR/.dotest-merge
  47 prec=4
  48
  49 continue_merge () {
  50         test -n "$prev_head" || die "prev_head must be defined"
  51         test -d "$dotest" || die "$dotest directory does not exist"
  52
  53         unmerged=$(git-ls-files -u)
  54         if test -n "$unmerged"
  55         then
  56                 echo "You still have unmerged paths in your index"
  57                 echo "did you forget update-index?"
  58                 die "$RESOLVEMSG"
  59         fi
  60
  61         if test -n "`git-diff-index HEAD`"
  62         then
  63                 if ! git-commit -C "`cat $dotest/current`"
  64                 then
  65                         echo "Commit failed, please do not call \"git commit\""
  66                         echo "directly, but instead do one of the following: "
  67                         die "$RESOLVEMSG"
  68                 fi
  69                 printf "Committed: %0${prec}d" $msgnum
  70         else
  71                 printf "Already applied: %0${prec}d" $msgnum
  72         fi
  73         echo ' '`git-rev-list --pretty=oneline -1 HEAD | \
  74                                 sed 's/^[a-f0-9]\+ //'`
  75
  76         prev_head=`git-rev-parse HEAD^0`
  77         # save the resulting commit so we can read-tree on it later
  78         echo "$prev_head" > "$dotest/prev_head"
  79
  80         # onto the next patch:
  81         msgnum=$(($msgnum + 1))
  82         echo "$msgnum" >"$dotest/msgnum"
  83 }
  84
  85 call_merge () {
  86         cmt="$(cat $dotest/cmt.$1)"
  87         echo "$cmt" > "$dotest/current"
  88         git-merge-$strategy "$cmt^" -- HEAD "$cmt"
  89         rv=$?
  90         case "$rv" in
  91         0)
  92                 return
  93                 ;;
  94         1)
  95                 test -d "$GIT_DIR/rr-cache" && git-rerere
  96                 die "$RESOLVEMSG"
  97                 ;;
  98         2)
  99                 echo "Strategy: $rv $strategy failed, try another" 1>&2
 100                 die "$RESOLVEMSG"
 101                 ;;
 102         *)
 103                 die "Unknown exit code ($rv) from command:" \
 104                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
 105                 ;;
 106         esac
 107 }
 108
 109 finish_rb_merge () {
 110         rm -r "$dotest"
 111         echo "All done."
 112 }
 113
 114 while case "$#" in 0) break ;; esac
 115 do
 116         case "$1" in
 117         --continue)
 118                 diff=$(git-diff-files)
 119                 case "$diff" in
 120                 ?*)     echo "You must edit all merge conflicts and then"
 121                         echo "mark them as resolved using git update-index"
 122                         exit 1
 123                         ;;
 124                 esac
 125                 if test -d "$dotest"
 126                 then
 127                         prev_head="`cat $dotest/prev_head`"
 128                         end="`cat $dotest/end`"
 129                         msgnum="`cat $dotest/msgnum`"
 130                         onto="`cat $dotest/onto`"
 131                         continue_merge
 132                         while test "$msgnum" -le "$end"
 133                         do
 134                                 call_merge "$msgnum"
 135                                 continue_merge
 136                         done
 137                         finish_rb_merge
 138                         exit
 139                 fi
 140                 git am --resolved --3way --resolvemsg="$RESOLVEMSG"
 141                 exit
 142                 ;;
 143         --skip)
 144                 if test -d "$dotest"
 145                 then
 146                         prev_head="`cat $dotest/prev_head`"
 147                         end="`cat $dotest/end`"
 148                         msgnum="`cat $dotest/msgnum`"
 149                         msgnum=$(($msgnum + 1))
 150                         onto="`cat $dotest/onto`"
 151                         while test "$msgnum" -le "$end"
 152                         do
 153                                 call_merge "$msgnum"
 154                                 continue_merge
 155                         done
 156                         finish_rb_merge
 157                         exit
 158                 fi
 159                 git am -3 --skip --resolvemsg="$RESOLVEMSG"
 160                 exit
 161                 ;;
 162         --abort)
 163                 if test -d "$dotest"
 164                 then
 165                         rm -r "$dotest"
 166                 elif test -d .dotest
 167                 then
 168                         rm -r .dotest
 169                 else
 170                         die "No rebase in progress?"
 171                 fi
 172                 git reset --hard ORIG_HEAD
 173                 exit
 174                 ;;
 175         --onto)
 176                 test 2 -le "$#" || usage
 177                 newbase="$2"
 178                 shift
 179                 ;;
 180         -M|-m|--m|--me|--mer|--merg|--merge)
 181                 do_merge=t
 182                 ;;
 183         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 184                 --strateg=*|--strategy=*|\
 185         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 186                 case "$#,$1" in
 187                 *,*=*)
 188                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 189                 1,*)
 190                         usage ;;
 191                 *)
 192                         strategy="$2"
 193                         shift ;;
 194                 esac
 195                 do_merge=t
 196                 ;;
 197         -*)
 198                 usage
 199                 ;;
 200         *)
 201                 break
 202                 ;;
 203         esac
 204         shift
 205 done
 206
 207 case "$strategy,${GIT_USE_RECUR_FOR_RECURSIVE}" in
 208 recursive,?*)
 209         strategy=recur ;;
 210 esac
 211
 212 # Make sure we do not have .dotest
 213 if test -z "$do_merge"
 214 then
 215         if mkdir .dotest
 216         then
 217                 rmdir .dotest
 218         else
 219                 echo >&2 '
 220 It seems that I cannot create a .dotest directory, and I wonder if you
 221 are in the middle of patch application or another rebase.  If that is not
 222 the case, please rm -fr .dotest and run me again.  I am stopping in case
 223 you still have something valuable there.'
 224                 exit 1
 225         fi
 226 else
 227         if test -d "$dotest"
 228         then
 229                 die "previous dotest directory $dotest still exists." \
 230                         'try git-rebase < --continue | --abort >'
 231         fi
 232 fi
 233
 234 # The tree must be really really clean.
 235 git-update-index --refresh || exit
 236 diff=$(git-diff-index --cached --name-status -r HEAD)
 237 case "$diff" in
 238 ?*)     echo "$diff"
 239         exit 1
 240         ;;
 241 esac
 242
 243 # The upstream head must be given.  Make sure it is valid.
 244 upstream_name="$1"
 245 upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 246     die "invalid upstream $upstream_name"
 247
 248 # If a hook exists, give it a chance to interrupt
 249 if test -x "$GIT_DIR/hooks/pre-rebase"
 250 then
 251         "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 252                 echo >&2 "The pre-rebase hook refused to rebase."
 253                 exit 1
 254         }
 255 fi
 256
 257 # If the branch to rebase is given, first switch to it.
 258 case "$#" in
 259 2)
 260         branch_name="$2"
 261         git-checkout "$2" || usage
 262         ;;
 263 *)
 264         branch_name=`git symbolic-ref HEAD` || die "No current branch"
 265         branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 266         ;;
 267 esac
 268 branch=$(git-rev-parse --verify "${branch_name}^0") || exit
 269
 270 # Make sure the branch to rebase onto is valid.
 271 onto_name=${newbase-"$upstream_name"}
 272 onto=$(git-rev-parse --verify "${onto_name}^0") || exit
 273
 274 # Now we are rebasing commits $upstream..$branch on top of $onto
 275
 276 # Check if we are already based on $onto, but this should be
 277 # done only when upstream and onto are the same.
 278 if test "$upstream" = "$onto"
 279 then
 280         mb=$(git-merge-base "$onto" "$branch")
 281         if test "$mb" = "$onto"
 282         then
 283                 echo >&2 "Current branch $branch_name is up to date."
 284                 exit 0
 285         fi
 286 fi
 287
 288 # Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
 289 git-reset --hard "$onto"
 290
 291 # If the $onto is a proper descendant of the tip of the branch, then
 292 # we just fast forwarded.
 293 if test "$mb" = "$onto"
 294 then
 295         echo >&2 "Fast-forwarded $branch to $newbase."
 296         exit 0
 297 fi
 298
 299 if test -z "$do_merge"
 300 then
 301         git-format-patch -k --stdout --full-index "$upstream"..ORIG_HEAD |
 302         git am --binary -3 -k --resolvemsg="$RESOLVEMSG"
 303         exit $?
 304 fi
 305
 306 if test "@@NO_PYTHON@@" && test "$strategy" = "recursive"
 307 then
 308         die 'The recursive merge strategy currently relies on Python,
 309 which this installation of git was not configured with.  Please consider
 310 a different merge strategy (e.g. octopus, resolve, stupid, ours)
 311 or install Python and git with Python support.'
 312
 313 fi
 314
 315 # start doing a rebase with git-merge
 316 # this is rename-aware if the recursive (default) strategy is used
 317
 318 mkdir -p "$dotest"
 319 echo "$onto" > "$dotest/onto"
 320 prev_head=`git-rev-parse HEAD^0`
 321 echo "$prev_head" > "$dotest/prev_head"
 322
 323 msgnum=0
 324 for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
 325                         | @@PERL@@ -e 'print reverse <>'`
 326 do
 327         msgnum=$(($msgnum + 1))
 328         echo "$cmt" > "$dotest/cmt.$msgnum"
 329 done
 330
 331 echo 1 >"$dotest/msgnum"
 332 echo $msgnum >"$dotest/end"
 333
 334 end=$msgnum
 335 msgnum=1
 336
 337 while test "$msgnum" -le "$end"
 338 do
 339         call_merge "$msgnum"
 340         continue_merge
 341 done
 342
 343 finish_rb_merge