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