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="$RESOLVEMSG" \
 141                         --reflog-action=rebase
 142                 exit
 143                 ;;
 144         --skip)
 145                 if test -d "$dotest"
 146                 then
 147                         prev_head="`cat $dotest/prev_head`"
 148                         end="`cat $dotest/end`"
 149                         msgnum="`cat $dotest/msgnum`"
 150                         msgnum=$(($msgnum + 1))
 151                         onto="`cat $dotest/onto`"
 152                         while test "$msgnum" -le "$end"
 153                         do
 154                                 call_merge "$msgnum"
 155                                 continue_merge
 156                         done
 157                         finish_rb_merge
 158                         exit
 159                 fi
 160                 git am -3 --skip --resolvemsg="$RESOLVEMSG" \
 161                         --reflog-action=rebase
 162                 exit
 163                 ;;
 164         --abort)
 165                 if test -d "$dotest"
 166                 then
 167                         rm -r "$dotest"
 168                 elif test -d .dotest
 169                 then
 170                         rm -r .dotest
 171                 else
 172                         die "No rebase in progress?"
 173                 fi
 174                 git reset --hard ORIG_HEAD
 175                 exit
 176                 ;;
 177         --onto)
 178                 test 2 -le "$#" || usage
 179                 newbase="$2"
 180                 shift
 181                 ;;
 182         -M|-m|--m|--me|--mer|--merg|--merge)
 183                 do_merge=t
 184                 ;;
 185         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 186                 --strateg=*|--strategy=*|\
 187         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 188                 case "$#,$1" in
 189                 *,*=*)
 190                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 191                 1,*)
 192                         usage ;;
 193                 *)
 194                         strategy="$2"
 195                         shift ;;
 196                 esac
 197                 do_merge=t
 198                 ;;
 199         -*)
 200                 usage
 201                 ;;
 202         *)
 203                 break
 204                 ;;
 205         esac
 206         shift
 207 done
 208
 209 case "$strategy,${GIT_USE_RECUR_FOR_RECURSIVE}" in
 210 recursive,?*)
 211         strategy=recur ;;
 212 esac
 213
 214 # Make sure we do not have .dotest
 215 if test -z "$do_merge"
 216 then
 217         if mkdir .dotest
 218         then
 219                 rmdir .dotest
 220         else
 221                 echo >&2 '
 222 It seems that I cannot create a .dotest directory, and I wonder if you
 223 are in the middle of patch application or another rebase.  If that is not
 224 the case, please rm -fr .dotest and run me again.  I am stopping in case
 225 you still have something valuable there.'
 226                 exit 1
 227         fi
 228 else
 229         if test -d "$dotest"
 230         then
 231                 die "previous dotest directory $dotest still exists." \
 232                         'try git-rebase < --continue | --abort >'
 233         fi
 234 fi
 235
 236 # The tree must be really really clean.
 237 git-update-index --refresh || exit
 238 diff=$(git-diff-index --cached --name-status -r HEAD)
 239 case "$diff" in
 240 ?*)     echo "$diff"
 241         exit 1
 242         ;;
 243 esac
 244
 245 # The upstream head must be given.  Make sure it is valid.
 246 upstream_name="$1"
 247 upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 248     die "invalid upstream $upstream_name"
 249
 250 # If a hook exists, give it a chance to interrupt
 251 if test -x "$GIT_DIR/hooks/pre-rebase"
 252 then
 253         "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 254                 echo >&2 "The pre-rebase hook refused to rebase."
 255                 exit 1
 256         }
 257 fi
 258
 259 # If the branch to rebase is given, first switch to it.
 260 case "$#" in
 261 2)
 262         branch_name="$2"
 263         git-checkout "$2" || usage
 264         ;;
 265 *)
 266         branch_name=`git symbolic-ref HEAD` || die "No current branch"
 267         branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 268         ;;
 269 esac
 270 branch=$(git-rev-parse --verify "${branch_name}^0") || exit
 271
 272 # Make sure the branch to rebase onto is valid.
 273 onto_name=${newbase-"$upstream_name"}
 274 onto=$(git-rev-parse --verify "${onto_name}^0") || exit
 275
 276 # Now we are rebasing commits $upstream..$branch on top of $onto
 277
 278 # Check if we are already based on $onto, but this should be
 279 # done only when upstream and onto are the same.
 280 if test "$upstream" = "$onto"
 281 then
 282         mb=$(git-merge-base "$onto" "$branch")
 283         if test "$mb" = "$onto"
 284         then
 285                 echo >&2 "Current branch $branch_name is up to date."
 286                 exit 0
 287         fi
 288 fi
 289
 290 # Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
 291 git-reset --hard "$onto"
 292
 293 # If the $onto is a proper descendant of the tip of the branch, then
 294 # we just fast forwarded.
 295 if test "$mb" = "$onto"
 296 then
 297         echo >&2 "Fast-forwarded $branch to $newbase."
 298         exit 0
 299 fi
 300
 301 if test -z "$do_merge"
 302 then
 303         git-format-patch -k --stdout --full-index "$upstream"..ORIG_HEAD |
 304         git am --binary -3 -k --resolvemsg="$RESOLVEMSG" \
 305                 --reflog-action=rebase
 306         exit $?
 307 fi
 308
 309 if test "@@NO_PYTHON@@" && test "$strategy" = "recursive"
 310 then
 311         die 'The recursive merge strategy currently relies on Python,
 312 which this installation of git was not configured with.  Please consider
 313 a different merge strategy (e.g. octopus, resolve, stupid, ours)
 314 or install Python and git with Python support.'
 315
 316 fi
 317
 318 # start doing a rebase with git-merge
 319 # this is rename-aware if the recursive (default) strategy is used
 320
 321 mkdir -p "$dotest"
 322 echo "$onto" > "$dotest/onto"
 323 prev_head=`git-rev-parse HEAD^0`
 324 echo "$prev_head" > "$dotest/prev_head"
 325
 326 msgnum=0
 327 for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
 328                         | @@PERL@@ -e 'print reverse <>'`
 329 do
 330         msgnum=$(($msgnum + 1))
 331         echo "$cmt" > "$dotest/cmt.$msgnum"
 332 done
 333
 334 echo 1 >"$dotest/msgnum"
 335 echo $msgnum >"$dotest/end"
 336
 337 end=$msgnum
 338 msgnum=1
 339
 340 while test "$msgnum" -le "$end"
 341 do
 342         call_merge "$msgnum"
 343         continue_merge
 344 done
 345
 346 finish_rb_merge