git-pull.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5 # Fetch one or more remote refs and merge it/them into the current HEAD.
   6
   7 USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...'
   8 LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
   9 SUBDIRECTORY_OK=Yes
  10 OPTIONS_SPEC=
  11 . git-sh-setup
  12 . git-sh-i18n
  13 set_reflog_action "pull${1+ $*}"
  14 require_work_tree_exists
  15 cd_to_toplevel
  16
  17
  18 die_conflict () {
  19     git diff-index --cached --name-status -r --ignore-submodules HEAD --
  20     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  21         die "$(gettext "Pull is not possible because you have unmerged files.
  22 Please, fix them up in the work tree, and then use 'git add/rm <file>'
  23 as appropriate to mark resolution, or use 'git commit -a'.")"
  24     else
  25         die "$(gettext "Pull is not possible because you have unmerged files.")"
  26     fi
  27 }
  28
  29 die_merge () {
  30     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  31         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
  32 Please, commit your changes before you can merge.")"
  33     else
  34         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
  35     fi
  36 }
  37
  38 test -z "$(git ls-files -u)" || die_conflict
  39 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
  40
  41 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  42 log_arg= verbosity= progress= recurse_submodules=
  43 merge_args=
  44 curr_branch=$(git symbolic-ref -q HEAD)
  45 curr_branch_short="${curr_branch#refs/heads/}"
  46 rebase=$(git config --bool branch.$curr_branch_short.rebase)
  47 if test -z "$rebase"
  48 then
  49         rebase=$(git config --bool pull.rebase)
  50 fi
  51 dry_run=
  52 while :
  53 do
  54         case "$1" in
  55         -q|--quiet)
  56                 verbosity="$verbosity -q" ;;
  57         -v|--verbose)
  58                 verbosity="$verbosity -v" ;;
  59         --progress)
  60                 progress=--progress ;;
  61         --no-progress)
  62                 progress=--no-progress ;;
  63         -n|--no-stat|--no-summary)
  64                 diffstat=--no-stat ;;
  65         --stat|--summary)
  66                 diffstat=--stat ;;
  67         --log|--no-log)
  68                 log_arg=$1 ;;
  69         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  70                 no_commit=--no-commit ;;
  71         --c|--co|--com|--comm|--commi|--commit)
  72                 no_commit=--commit ;;
  73         --sq|--squ|--squa|--squas|--squash)
  74                 squash=--squash ;;
  75         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  76                 squash=--no-squash ;;
  77         --ff)
  78                 no_ff=--ff ;;
  79         --no-ff)
  80                 no_ff=--no-ff ;;
  81         --ff-only)
  82                 ff_only=--ff-only ;;
  83         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  84                 --strateg=*|--strategy=*|\
  85         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  86                 case "$#,$1" in
  87                 *,*=*)
  88                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  89                 1,*)
  90                         usage ;;
  91                 *)
  92                         strategy="$2"
  93                         shift ;;
  94                 esac
  95                 strategy_args="${strategy_args}-s $strategy "
  96                 ;;
  97         -X*)
  98                 case "$#,$1" in
  99                 1,-X)
 100                         usage ;;
 101                 *,-X)
 102                         xx="-X $(git rev-parse --sq-quote "$2")"
 103                         shift ;;
 104                 *,*)
 105                         xx=$(git rev-parse --sq-quote "$1") ;;
 106                 esac
 107                 merge_args="$merge_args$xx "
 108                 ;;
 109         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 110                 rebase=true
 111                 ;;
 112         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 113                 rebase=false
 114                 ;;
 115         --recurse-submodules)
 116                 recurse_submodules=--recurse-submodules
 117                 ;;
 118         --recurse-submodules=*)
 119                 recurse_submodules="$1"
 120                 ;;
 121         --no-recurse-submodules)
 122                 recurse_submodules=--no-recurse-submodules
 123                 ;;
 124         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 125                 dry_run=--dry-run
 126                 ;;
 127         -h|--help-all)
 128                 usage
 129                 ;;
 130         *)
 131                 # Pass thru anything that may be meant for fetch.
 132                 break
 133                 ;;
 134         esac
 135         shift
 136 done
 137
 138 error_on_no_merge_candidates () {
 139         exec >&2
 140         for opt
 141         do
 142                 case "$opt" in
 143                 -t|--t|--ta|--tag|--tags)
 144                         echo "Fetching tags only, you probably meant:"
 145                         echo "  git fetch --tags"
 146                         exit 1
 147                 esac
 148         done
 149
 150         if test true = "$rebase"
 151         then
 152                 op_type=rebase
 153                 op_prep=against
 154         else
 155                 op_type=merge
 156                 op_prep=with
 157         fi
 158
 159         curr_branch=${curr_branch#refs/heads/}
 160         upstream=$(git config "branch.$curr_branch.merge")
 161         remote=$(git config "branch.$curr_branch.remote")
 162
 163         if [ $# -gt 1 ]; then
 164                 if [ "$rebase" = true ]; then
 165                         printf "There is no candidate for rebasing against "
 166                 else
 167                         printf "There are no candidates for merging "
 168                 fi
 169                 echo "among the refs that you just fetched."
 170                 echo "Generally this means that you provided a wildcard refspec which had no"
 171                 echo "matches on the remote end."
 172         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 173                 echo "You asked to pull from the remote '$1', but did not specify"
 174                 echo "a branch. Because this is not the default configured remote"
 175                 echo "for your current branch, you must specify a branch on the command line."
 176         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
 177                 . git-parse-remote
 178                 error_on_missing_default_upstream "pull" $op_type $op_prep \
 179                         "git pull <repository> <refspec>"
 180         else
 181                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 182                 echo "from the remote, but no such ref was fetched."
 183         fi
 184         exit 1
 185 }
 186
 187 test true = "$rebase" && {
 188         if ! git rev-parse -q --verify HEAD >/dev/null
 189         then
 190                 # On an unborn branch
 191                 if test -f "$GIT_DIR/index"
 192                 then
 193                         die "$(gettext "updating an unborn branch with changes added to the index")"
 194                 fi
 195         else
 196                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 197         fi
 198         oldremoteref= &&
 199         . git-parse-remote &&
 200         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 201         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 202         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 203         do
 204                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 205                 then
 206                         oldremoteref="$reflog"
 207                         break
 208                 fi
 209         done
 210 }
 211 orig_head=$(git rev-parse -q --verify HEAD)
 212 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 213 test -z "$dry_run" || exit 0
 214
 215 curr_head=$(git rev-parse -q --verify HEAD)
 216 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 217 then
 218         # The fetch involved updating the current branch.
 219
 220         # The working tree and the index file is still based on the
 221         # $orig_head commit, but we are merging into $curr_head.
 222         # First update the working tree to match $curr_head.
 223
 224         eval_gettextln "Warning: fetch updated the current branch head.
 225 Warning: fast-forwarding your working tree from
 226 Warning: commit \$orig_head." >&2
 227         git update-index -q --refresh
 228         git read-tree -u -m "$orig_head" "$curr_head" ||
 229                 die "$(eval_gettext "Cannot fast-forward your working tree.
 230 After making sure that you saved anything precious from
 231 $ git diff \$orig_head
 232 output, run
 233 $ git reset --hard
 234 to recover.")"
 235
 236 fi
 237
 238 merge_head=$(sed -e '/  not-for-merge   /d' \
 239         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 240         tr '\012' ' ')
 241
 242 case "$merge_head" in
 243 '')
 244         error_on_no_merge_candidates "$@"
 245         ;;
 246 ?*' '?*)
 247         if test -z "$orig_head"
 248         then
 249                 die "$(gettext "Cannot merge multiple branches into empty head")"
 250         fi
 251         if test true = "$rebase"
 252         then
 253                 die "$(gettext "Cannot rebase onto multiple branches")"
 254         fi
 255         ;;
 256 esac
 257
 258 if test -z "$orig_head"
 259 then
 260         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 261         git read-tree -m -u HEAD || exit 1
 262         exit
 263 fi
 264
 265 if test true = "$rebase"
 266 then
 267         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 268         if test "$oldremoteref" = "$o"
 269         then
 270                 unset oldremoteref
 271         fi
 272 fi
 273
 274 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 275 case "$rebase" in
 276 true)
 277         eval="git-rebase $diffstat $strategy_args $merge_args"
 278         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 279         ;;
 280 *)
 281         eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
 282         eval="$eval  $log_arg $strategy_args $merge_args $verbosity $progress"
 283         eval="$eval \"\$merge_name\" HEAD $merge_head"
 284         ;;
 285 esac
 286 eval "exec $eval"