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 set_reflog_action "pull $*"
  13 require_work_tree
  14 cd_to_toplevel
  15
  16
  17 die_conflict () {
  18     git diff-index --cached --name-status -r --ignore-submodules HEAD --
  19     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  20         die "Pull is not possible because you have unmerged files.
  21 Please, fix them up in the work tree, and then use 'git add/rm <file>'
  22 as appropriate to mark resolution, or use 'git commit -a'."
  23     else
  24         die "Pull is not possible because you have unmerged files."
  25     fi
  26 }
  27
  28 die_merge () {
  29     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  30         die "You have not concluded your merge (MERGE_HEAD exists).
  31 Please, commit your changes before you can merge."
  32     else
  33         die "You have not concluded your merge (MERGE_HEAD exists)."
  34     fi
  35 }
  36
  37 test -z "$(git ls-files -u)" || die_conflict
  38 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
  39
  40 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  41 log_arg= verbosity= progress=
  42 merge_args=
  43 curr_branch=$(git symbolic-ref -q HEAD)
  44 curr_branch_short="${curr_branch#refs/heads/}"
  45 rebase=$(git config --bool branch.$curr_branch_short.rebase)
  46 dry_run=
  47 while :
  48 do
  49         case "$1" in
  50         -q|--quiet)
  51                 verbosity="$verbosity -q" ;;
  52         -v|--verbose)
  53                 verbosity="$verbosity -v" ;;
  54         --progress)
  55                 progress=--progress ;;
  56         -n|--no-stat|--no-summary)
  57                 diffstat=--no-stat ;;
  58         --stat|--summary)
  59                 diffstat=--stat ;;
  60         --log|--no-log)
  61                 log_arg=$1 ;;
  62         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  63                 no_commit=--no-commit ;;
  64         --c|--co|--com|--comm|--commi|--commit)
  65                 no_commit=--commit ;;
  66         --sq|--squ|--squa|--squas|--squash)
  67                 squash=--squash ;;
  68         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  69                 squash=--no-squash ;;
  70         --ff)
  71                 no_ff=--ff ;;
  72         --no-ff)
  73                 no_ff=--no-ff ;;
  74         --ff-only)
  75                 ff_only=--ff-only ;;
  76         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  77                 --strateg=*|--strategy=*|\
  78         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  79                 case "$#,$1" in
  80                 *,*=*)
  81                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  82                 1,*)
  83                         usage ;;
  84                 *)
  85                         strategy="$2"
  86                         shift ;;
  87                 esac
  88                 strategy_args="${strategy_args}-s $strategy "
  89                 ;;
  90         -X*)
  91                 case "$#,$1" in
  92                 1,-X)
  93                         usage ;;
  94                 *,-X)
  95                         xx="-X $(git rev-parse --sq-quote "$2")"
  96                         shift ;;
  97                 *,*)
  98                         xx=$(git rev-parse --sq-quote "$1") ;;
  99                 esac
 100                 merge_args="$merge_args$xx "
 101                 ;;
 102         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 103                 rebase=true
 104                 ;;
 105         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 106                 rebase=false
 107                 ;;
 108         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 109                 dry_run=--dry-run
 110                 ;;
 111         -h|--h|--he|--hel|--help)
 112                 usage
 113                 ;;
 114         *)
 115                 # Pass thru anything that may be meant for fetch.
 116                 break
 117                 ;;
 118         esac
 119         shift
 120 done
 121
 122 error_on_no_merge_candidates () {
 123         exec >&2
 124         for opt
 125         do
 126                 case "$opt" in
 127                 -t|--t|--ta|--tag|--tags)
 128                         echo "Fetching tags only, you probably meant:"
 129                         echo "  git fetch --tags"
 130                         exit 1
 131                 esac
 132         done
 133
 134         if test true = "$rebase"
 135         then
 136                 op_type=rebase
 137                 op_prep=against
 138         else
 139                 op_type=merge
 140                 op_prep=with
 141         fi
 142
 143         curr_branch=${curr_branch#refs/heads/}
 144         upstream=$(git config "branch.$curr_branch.merge")
 145         remote=$(git config "branch.$curr_branch.remote")
 146
 147         if [ $# -gt 1 ]; then
 148                 if [ "$rebase" = true ]; then
 149                         printf "There is no candidate for rebasing against "
 150                 else
 151                         printf "There are no candidates for merging "
 152                 fi
 153                 echo "among the refs that you just fetched."
 154                 echo "Generally this means that you provided a wildcard refspec which had no"
 155                 echo "matches on the remote end."
 156         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 157                 echo "You asked to pull from the remote '$1', but did not specify"
 158                 echo "a branch. Because this is not the default configured remote"
 159                 echo "for your current branch, you must specify a branch on the command line."
 160         elif [ -z "$curr_branch" ]; then
 161                 echo "You are not currently on a branch, so I cannot use any"
 162                 echo "'branch.<branchname>.merge' in your configuration file."
 163                 echo "Please specify which remote branch you want to use on the command"
 164                 echo "line and try again (e.g. 'git pull <repository> <refspec>')."
 165                 echo "See git-pull(1) for details."
 166         elif [ -z "$upstream" ]; then
 167                 echo "You asked me to pull without telling me which branch you"
 168                 echo "want to $op_type $op_prep, and 'branch.${curr_branch}.merge' in"
 169                 echo "your configuration file does not tell me, either. Please"
 170                 echo "specify which branch you want to use on the command line and"
 171                 echo "try again (e.g. 'git pull <repository> <refspec>')."
 172                 echo "See git-pull(1) for details."
 173                 echo
 174                 echo "If you often $op_type $op_prep the same branch, you may want to"
 175                 echo "use something like the following in your configuration file:"
 176                 echo
 177                 echo "    [branch \"${curr_branch}\"]"
 178                 echo "    remote = <nickname>"
 179                 echo "    merge = <remote-ref>"
 180                 test rebase = "$op_type" &&
 181                         echo "    rebase = true"
 182                 echo
 183                 echo "    [remote \"<nickname>\"]"
 184                 echo "    url = <url>"
 185                 echo "    fetch = <refspec>"
 186                 echo
 187                 echo "See git-config(1) for details."
 188         else
 189                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 190                 echo "from the remote, but no such ref was fetched."
 191         fi
 192         exit 1
 193 }
 194
 195 test true = "$rebase" && {
 196         if ! git rev-parse -q --verify HEAD >/dev/null
 197         then
 198                 # On an unborn branch
 199                 if test -f "$GIT_DIR/index"
 200                 then
 201                         die "updating an unborn branch with changes added to the index"
 202                 fi
 203         else
 204                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 205         fi
 206         oldremoteref= &&
 207         . git-parse-remote &&
 208         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 209         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 210         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 211         do
 212                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 213                 then
 214                         oldremoteref="$reflog"
 215                         break
 216                 fi
 217         done
 218 }
 219 orig_head=$(git rev-parse -q --verify HEAD)
 220 git fetch $verbosity $progress $dry_run --update-head-ok "$@" || exit 1
 221 test -z "$dry_run" || exit 0
 222
 223 curr_head=$(git rev-parse -q --verify HEAD)
 224 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 225 then
 226         # The fetch involved updating the current branch.
 227
 228         # The working tree and the index file is still based on the
 229         # $orig_head commit, but we are merging into $curr_head.
 230         # First update the working tree to match $curr_head.
 231
 232         echo >&2 "Warning: fetch updated the current branch head."
 233         echo >&2 "Warning: fast-forwarding your working tree from"
 234         echo >&2 "Warning: commit $orig_head."
 235         git update-index -q --refresh
 236         git read-tree -u -m "$orig_head" "$curr_head" ||
 237                 die 'Cannot fast-forward your working tree.
 238 After making sure that you saved anything precious from
 239 $ git diff '$orig_head'
 240 output, run
 241 $ git reset --hard
 242 to recover.'
 243
 244 fi
 245
 246 merge_head=$(sed -e '/  not-for-merge   /d' \
 247         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 248         tr '\012' ' ')
 249
 250 case "$merge_head" in
 251 '')
 252         error_on_no_merge_candidates "$@"
 253         ;;
 254 ?*' '?*)
 255         if test -z "$orig_head"
 256         then
 257                 die "Cannot merge multiple branches into empty head"
 258         fi
 259         if test true = "$rebase"
 260         then
 261                 die "Cannot rebase onto multiple branches"
 262         fi
 263         ;;
 264 esac
 265
 266 if test -z "$orig_head"
 267 then
 268         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 269         git read-tree --reset -u HEAD || exit 1
 270         exit
 271 fi
 272
 273 if test true = "$rebase"
 274 then
 275         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 276         if test "$oldremoteref" = "$o"
 277         then
 278                 unset oldremoteref
 279         fi
 280 fi
 281
 282 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 283 case "$rebase" in
 284 true)
 285         eval="git-rebase $diffstat $strategy_args $merge_args"
 286         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 287         ;;
 288 *)
 289         eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
 290         eval="$eval  $log_arg $strategy_args $merge_args"
 291         eval="$eval \"\$merge_name\" HEAD $merge_head $verbosity"
 292         ;;
 293 esac
 294 eval "exec $eval"