git-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 USAGE='[--interactive | -i] [-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
  31 SUBDIRECTORY_OK=Yes
  32 . git-sh-setup
  33 set_reflog_action rebase
  34 require_work_tree
  35 cd_to_toplevel
  36
  37 RESOLVEMSG="
  38 When you have resolved this problem run \"git rebase --continue\".
  39 If you would prefer to skip this patch, instead run \"git rebase --skip\".
  40 To restore the original branch and stop rebasing run \"git rebase --abort\".
  41 "
  42 unset newbase
  43 strategy=recursive
  44 do_merge=
  45 dotest=$GIT_DIR/.dotest-merge
  46 prec=4
  47 verbose=
  48 git_am_opt=
  49
  50 continue_merge () {
  51         test -n "$prev_head" || die "prev_head must be defined"
  52         test -d "$dotest" || die "$dotest directory does not exist"
  53
  54         unmerged=$(git ls-files -u)
  55         if test -n "$unmerged"
  56         then
  57                 echo "You still have unmerged paths in your index"
  58                 echo "did you forget to use git add?"
  59                 die "$RESOLVEMSG"
  60         fi
  61
  62         cmt=`cat "$dotest/current"`
  63         if ! git diff-index --quiet HEAD
  64         then
  65                 if ! git-commit -C "$cmt"
  66                 then
  67                         echo "Commit failed, please do not call \"git commit\""
  68                         echo "directly, but instead do one of the following: "
  69                         die "$RESOLVEMSG"
  70                 fi
  71                 printf "Committed: %0${prec}d " $msgnum
  72         else
  73                 printf "Already applied: %0${prec}d " $msgnum
  74         fi
  75         git rev-list --pretty=oneline -1 "$cmt" | sed -e 's/^[^ ]* //'
  76
  77         prev_head=`git rev-parse HEAD^0`
  78         # save the resulting commit so we can read-tree on it later
  79         echo "$prev_head" > "$dotest/prev_head"
  80
  81         # onto the next patch:
  82         msgnum=$(($msgnum + 1))
  83         echo "$msgnum" >"$dotest/msgnum"
  84 }
  85
  86 call_merge () {
  87         cmt="$(cat "$dotest/cmt.$1")"
  88         echo "$cmt" > "$dotest/current"
  89         hd=$(git rev-parse --verify HEAD)
  90         cmt_name=$(git symbolic-ref HEAD)
  91         msgnum=$(cat "$dotest/msgnum")
  92         end=$(cat "$dotest/end")
  93         eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
  94         eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
  95         export GITHEAD_$cmt GITHEAD_$hd
  96         git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
  97         rv=$?
  98         case "$rv" in
  99         0)
 100                 unset GITHEAD_$cmt GITHEAD_$hd
 101                 return
 102                 ;;
 103         1)
 104                 git rerere
 105                 die "$RESOLVEMSG"
 106                 ;;
 107         2)
 108                 echo "Strategy: $rv $strategy failed, try another" 1>&2
 109                 die "$RESOLVEMSG"
 110                 ;;
 111         *)
 112                 die "Unknown exit code ($rv) from command:" \
 113                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
 114                 ;;
 115         esac
 116 }
 117
 118 finish_rb_merge () {
 119         rm -r "$dotest"
 120         echo "All done."
 121 }
 122
 123 is_interactive () {
 124         test -f "$dotest"/interactive ||
 125         while :; do case $#,"$1" in 0,|*,-i|*,--interactive) break ;; esac
 126                 shift
 127         done && test -n "$1"
 128 }
 129
 130 is_interactive "$@" && exec git-rebase--interactive "$@"
 131
 132 while test $# != 0
 133 do
 134         case "$1" in
 135         --continue)
 136                 git diff-files --quiet || {
 137                         echo "You must edit all merge conflicts and then"
 138                         echo "mark them as resolved using git add"
 139                         exit 1
 140                 }
 141                 if test -d "$dotest"
 142                 then
 143                         prev_head=$(cat "$dotest/prev_head")
 144                         end=$(cat "$dotest/end")
 145                         msgnum=$(cat "$dotest/msgnum")
 146                         onto=$(cat "$dotest/onto")
 147                         continue_merge
 148                         while test "$msgnum" -le "$end"
 149                         do
 150                                 call_merge "$msgnum"
 151                                 continue_merge
 152                         done
 153                         finish_rb_merge
 154                         exit
 155                 fi
 156                 git am --resolved --3way --resolvemsg="$RESOLVEMSG"
 157                 exit
 158                 ;;
 159         --skip)
 160                 if test -d "$dotest"
 161                 then
 162                         git rerere clear
 163                         prev_head=$(cat "$dotest/prev_head")
 164                         end=$(cat "$dotest/end")
 165                         msgnum=$(cat "$dotest/msgnum")
 166                         msgnum=$(($msgnum + 1))
 167                         onto=$(cat "$dotest/onto")
 168                         while test "$msgnum" -le "$end"
 169                         do
 170                                 call_merge "$msgnum"
 171                                 continue_merge
 172                         done
 173                         finish_rb_merge
 174                         exit
 175                 fi
 176                 git am -3 --skip --resolvemsg="$RESOLVEMSG"
 177                 exit
 178                 ;;
 179         --abort)
 180                 git rerere clear
 181                 if test -d "$dotest"
 182                 then
 183                         rm -r "$dotest"
 184                 elif test -d .dotest
 185                 then
 186                         rm -r .dotest
 187                 else
 188                         die "No rebase in progress?"
 189                 fi
 190                 git reset --hard ORIG_HEAD
 191                 exit
 192                 ;;
 193         --onto)
 194                 test 2 -le "$#" || usage
 195                 newbase="$2"
 196                 shift
 197                 ;;
 198         -M|-m|--m|--me|--mer|--merg|--merge)
 199                 do_merge=t
 200                 ;;
 201         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 202                 --strateg=*|--strategy=*|\
 203         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 204                 case "$#,$1" in
 205                 *,*=*)
 206                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 207                 1,*)
 208                         usage ;;
 209                 *)
 210                         strategy="$2"
 211                         shift ;;
 212                 esac
 213                 do_merge=t
 214                 ;;
 215         -v|--verbose)
 216                 verbose=t
 217                 ;;
 218         -C*)
 219                 git_am_opt=$1
 220                 shift
 221                 ;;
 222         -*)
 223                 usage
 224                 ;;
 225         *)
 226                 break
 227                 ;;
 228         esac
 229         shift
 230 done
 231
 232 # Make sure we do not have .dotest
 233 if test -z "$do_merge"
 234 then
 235         if mkdir .dotest
 236         then
 237                 rmdir .dotest
 238         else
 239                 echo >&2 '
 240 It seems that I cannot create a .dotest directory, and I wonder if you
 241 are in the middle of patch application or another rebase.  If that is not
 242 the case, please rm -fr .dotest and run me again.  I am stopping in case
 243 you still have something valuable there.'
 244                 exit 1
 245         fi
 246 else
 247         if test -d "$dotest"
 248         then
 249                 die "previous dotest directory $dotest still exists." \
 250                         'try git-rebase < --continue | --abort >'
 251         fi
 252 fi
 253
 254 # The tree must be really really clean.
 255 git update-index --refresh || exit
 256 diff=$(git diff-index --cached --name-status -r HEAD)
 257 case "$diff" in
 258 ?*)     echo "cannot rebase: your index is not up-to-date"
 259         echo "$diff"
 260         exit 1
 261         ;;
 262 esac
 263
 264 # The upstream head must be given.  Make sure it is valid.
 265 upstream_name="$1"
 266 upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 267     die "invalid upstream $upstream_name"
 268
 269 # Make sure the branch to rebase onto is valid.
 270 onto_name=${newbase-"$upstream_name"}
 271 onto=$(git rev-parse --verify "${onto_name}^0") || exit
 272
 273 # If a hook exists, give it a chance to interrupt
 274 if test -x "$GIT_DIR/hooks/pre-rebase"
 275 then
 276         "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 277                 echo >&2 "The pre-rebase hook refused to rebase."
 278                 exit 1
 279         }
 280 fi
 281
 282 # If the branch to rebase is given, first switch to it.
 283 case "$#" in
 284 2)
 285         branch_name="$2"
 286         git-checkout "$2" || usage
 287         ;;
 288 *)
 289         if branch_name=`git symbolic-ref -q HEAD`
 290         then
 291                 branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 292         else
 293                 branch_name=HEAD ;# detached
 294         fi
 295         ;;
 296 esac
 297 branch=$(git rev-parse --verify "${branch_name}^0") || exit
 298
 299 # Now we are rebasing commits $upstream..$branch on top of $onto
 300
 301 # Check if we are already based on $onto with linear history,
 302 # but this should be done only when upstream and onto are the same.
 303 mb=$(git merge-base "$onto" "$branch")
 304 if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 305         # linear history?
 306         ! git rev-list --parents "$onto".."$branch" | grep " .* " > /dev/null
 307 then
 308         echo >&2 "Current branch $branch_name is up to date."
 309         exit 0
 310 fi
 311
 312 if test -n "$verbose"
 313 then
 314         echo "Changes from $mb to $onto:"
 315         # We want color (if set), but no pager
 316         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 317 fi
 318
 319 # Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
 320 echo "First, rewinding head to replay your work on top of it..."
 321 git-reset --hard "$onto"
 322
 323 # If the $onto is a proper descendant of the tip of the branch, then
 324 # we just fast forwarded.
 325 if test "$mb" = "$branch"
 326 then
 327         echo >&2 "Fast-forwarded $branch_name to $onto_name."
 328         exit 0
 329 fi
 330
 331 if test -z "$do_merge"
 332 then
 333         git format-patch -k --stdout --full-index --ignore-if-in-upstream "$upstream"..ORIG_HEAD |
 334         git am $git_am_opt --binary -3 -k --resolvemsg="$RESOLVEMSG"
 335         exit $?
 336 fi
 337
 338 # start doing a rebase with git-merge
 339 # this is rename-aware if the recursive (default) strategy is used
 340
 341 mkdir -p "$dotest"
 342 echo "$onto" > "$dotest/onto"
 343 echo "$onto_name" > "$dotest/onto_name"
 344 prev_head=`git rev-parse HEAD^0`
 345 echo "$prev_head" > "$dotest/prev_head"
 346
 347 msgnum=0
 348 for cmt in `git rev-list --reverse --no-merges "$upstream"..ORIG_HEAD`
 349 do
 350         msgnum=$(($msgnum + 1))
 351         echo "$cmt" > "$dotest/cmt.$msgnum"
 352 done
 353
 354 echo 1 >"$dotest/msgnum"
 355 echo $msgnum >"$dotest/end"
 356
 357 end=$msgnum
 358 msgnum=1
 359
 360 while test "$msgnum" -le "$end"
 361 do
 362         call_merge "$msgnum"
 363         continue_merge
 364 done
 365
 366 finish_rb_merge