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="${curr_branch#refs/heads/}"
  46 rebase_options=
  47 rebase=$(git config --bool branch.$curr_branch_short.rebase)
  48 if test -z "$rebase"
  49 then
  50         rebase=$(git config --bool pull.rebase)
  51 fi
  52 dry_run=
  53 while :
  54 do
  55         case "$1" in
  56         -q|--quiet)
  57                 verbosity="$verbosity -q" ;;
  58         -v|--verbose)
  59                 verbosity="$verbosity -v" ;;
  60         --progress)
  61                 progress=--progress ;;
  62         --no-progress)
  63                 progress=--no-progress ;;
  64         -n|--no-stat|--no-summary)
  65                 diffstat=--no-stat ;;
  66         --stat|--summary)
  67                 diffstat=--stat ;;
  68         --log|--no-log)
  69                 log_arg=$1 ;;
  70         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  71                 no_commit=--no-commit ;;
  72         --c|--co|--com|--comm|--commi|--commit)
  73                 no_commit=--commit ;;
  74         --sq|--squ|--squa|--squas|--squash)
  75                 squash=--squash ;;
  76         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  77                 squash=--no-squash ;;
  78         --ff)
  79                 no_ff=--ff ;;
  80         --no-ff)
  81                 no_ff=--no-ff ;;
  82         --ff-only)
  83                 ff_only=--ff-only ;;
  84         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  85                 --strateg=*|--strategy=*|\
  86         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  87                 case "$#,$1" in
  88                 *,*=*)
  89                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  90                 1,*)
  91                         usage ;;
  92                 *)
  93                         strategy="$2"
  94                         shift ;;
  95                 esac
  96                 strategy_args="${strategy_args}-s $strategy "
  97                 ;;
  98         -X*)
  99                 case "$#,$1" in
 100                 1,-X)
 101                         usage ;;
 102                 *,-X)
 103                         xx="-X $(git rev-parse --sq-quote "$2")"
 104                         shift ;;
 105                 *,*)
 106                         xx=$(git rev-parse --sq-quote "$1") ;;
 107                 esac
 108                 merge_args="$merge_args$xx "
 109                 ;;
 110         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 111                 rebase=true
 112                 ;;
 113         --rebase=i|--rebase=interactive)
 114                 rebase_options=-i
 115                 rebase=true
 116                 ;;
 117         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 118                 rebase_options=
 119                 rebase=false
 120                 ;;
 121         --recurse-submodules)
 122                 recurse_submodules=--recurse-submodules
 123                 ;;
 124         --recurse-submodules=*)
 125                 recurse_submodules="$1"
 126                 ;;
 127         --no-recurse-submodules)
 128                 recurse_submodules=--no-recurse-submodules
 129                 ;;
 130         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 131                 dry_run=--dry-run
 132                 ;;
 133         -h|--help-all)
 134                 usage
 135                 ;;
 136         *)
 137                 # Pass thru anything that may be meant for fetch.
 138                 break
 139                 ;;
 140         esac
 141         shift
 142 done
 143
 144 error_on_no_merge_candidates () {
 145         exec >&2
 146         for opt
 147         do
 148                 case "$opt" in
 149                 -t|--t|--ta|--tag|--tags)
 150                         echo "Fetching tags only, you probably meant:"
 151                         echo "  git fetch --tags"
 152                         exit 1
 153                 esac
 154         done
 155
 156         if test true = "$rebase"
 157         then
 158                 op_type=rebase
 159                 op_prep=against
 160         else
 161                 op_type=merge
 162                 op_prep=with
 163         fi
 164
 165         curr_branch=${curr_branch#refs/heads/}
 166         upstream=$(git config "branch.$curr_branch.merge")
 167         remote=$(git config "branch.$curr_branch.remote")
 168
 169         if [ $# -gt 1 ]; then
 170                 if [ "$rebase" = true ]; then
 171                         printf "There is no candidate for rebasing against "
 172                 else
 173                         printf "There are no candidates for merging "
 174                 fi
 175                 echo "among the refs that you just fetched."
 176                 echo "Generally this means that you provided a wildcard refspec which had no"
 177                 echo "matches on the remote end."
 178         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 179                 echo "You asked to pull from the remote '$1', but did not specify"
 180                 echo "a branch. Because this is not the default configured remote"
 181                 echo "for your current branch, you must specify a branch on the command line."
 182         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
 183                 . git-parse-remote
 184                 error_on_missing_default_upstream "pull" $op_type $op_prep \
 185                         "git pull <repository> <refspec>"
 186         else
 187                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 188                 echo "from the remote, but no such ref was fetched."
 189         fi
 190         exit 1
 191 }
 192
 193 test true = "$rebase" && {
 194         if ! git rev-parse -q --verify HEAD >/dev/null
 195         then
 196                 # On an unborn branch
 197                 if test -f "$GIT_DIR/index"
 198                 then
 199                         die "$(gettext "updating an unborn branch with changes added to the index")"
 200                 fi
 201         else
 202                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 203         fi
 204         oldremoteref= &&
 205         . git-parse-remote &&
 206         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 207         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 208         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 209         do
 210                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 211                 then
 212                         oldremoteref="$reflog"
 213                         break
 214                 fi
 215         done
 216 }
 217 orig_head=$(git rev-parse -q --verify HEAD)
 218 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 219 test -z "$dry_run" || exit 0
 220
 221 curr_head=$(git rev-parse -q --verify HEAD)
 222 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 223 then
 224         # The fetch involved updating the current branch.
 225
 226         # The working tree and the index file is still based on the
 227         # $orig_head commit, but we are merging into $curr_head.
 228         # First update the working tree to match $curr_head.
 229
 230         eval_gettextln "Warning: fetch updated the current branch head.
 231 Warning: fast-forwarding your working tree from
 232 Warning: commit \$orig_head." >&2
 233         git update-index -q --refresh
 234         git read-tree -u -m "$orig_head" "$curr_head" ||
 235                 die "$(eval_gettext "Cannot fast-forward your working tree.
 236 After making sure that you saved anything precious from
 237 $ git diff \$orig_head
 238 output, run
 239 $ git reset --hard
 240 to recover.")"
 241
 242 fi
 243
 244 merge_head=$(sed -e '/  not-for-merge   /d' \
 245         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 246         tr '\012' ' ')
 247
 248 case "$merge_head" in
 249 '')
 250         error_on_no_merge_candidates "$@"
 251         ;;
 252 ?*' '?*)
 253         if test -z "$orig_head"
 254         then
 255                 die "$(gettext "Cannot merge multiple branches into empty head")"
 256         fi
 257         if test true = "$rebase"
 258         then
 259                 die "$(gettext "Cannot rebase onto multiple branches")"
 260         fi
 261         ;;
 262 esac
 263
 264 if test -z "$orig_head"
 265 then
 266         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 267         git read-tree -m -u HEAD || exit 1
 268         exit
 269 fi
 270
 271 if test true = "$rebase"
 272 then
 273         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 274         if test "$oldremoteref" = "$o"
 275         then
 276                 unset oldremoteref
 277         fi
 278 fi
 279
 280 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 281 case "$rebase" in
 282 true)
 283         eval="git-rebase $rebase_options $diffstat $strategy_args $merge_args"
 284         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 285         ;;
 286 *)
 287         eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
 288         eval="$eval  $log_arg $strategy_args $merge_args $verbosity $progress"
 289         eval="$eval \"\$merge_name\" HEAD $merge_head"
 290         ;;
 291 esac
 292 eval "exec $eval"