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