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 "$GIT_DIR/MERGE_HEAD" && die_merge
  39
  40 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  41 log_arg= verbosity= progress= recurse_submodules=
  42 merge_args=
  43 curr_branch=$(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$xx "
 101                 ;;
 102         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 103                 rebase=true
 104                 ;;
 105         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 106                 rebase=false
 107                 ;;
 108         --recurse-submodules)
 109                 recurse_submodules=--recurse-submodules
 110                 ;;
 111         --no-recurse-submodules)
 112                 recurse_submodules=--no-recurse-submodules
 113                 ;;
 114         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 115                 dry_run=--dry-run
 116                 ;;
 117         -h|--h|--he|--hel|--help)
 118                 usage
 119                 ;;
 120         *)
 121                 # Pass thru anything that may be meant for fetch.
 122                 break
 123                 ;;
 124         esac
 125         shift
 126 done
 127
 128 error_on_no_merge_candidates () {
 129         exec >&2
 130         for opt
 131         do
 132                 case "$opt" in
 133                 -t|--t|--ta|--tag|--tags)
 134                         echo "Fetching tags only, you probably meant:"
 135                         echo "  git fetch --tags"
 136                         exit 1
 137                 esac
 138         done
 139
 140         if test true = "$rebase"
 141         then
 142                 op_type=rebase
 143                 op_prep=against
 144         else
 145                 op_type=merge
 146                 op_prep=with
 147         fi
 148
 149         curr_branch=${curr_branch#refs/heads/}
 150         upstream=$(git config "branch.$curr_branch.merge")
 151         remote=$(git config "branch.$curr_branch.remote")
 152
 153         if [ $# -gt 1 ]; then
 154                 if [ "$rebase" = true ]; then
 155                         printf "There is no candidate for rebasing against "
 156                 else
 157                         printf "There are no candidates for merging "
 158                 fi
 159                 echo "among the refs that you just fetched."
 160                 echo "Generally this means that you provided a wildcard refspec which had no"
 161                 echo "matches on the remote end."
 162         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 163                 echo "You asked to pull from the remote '$1', but did not specify"
 164                 echo "a branch. Because this is not the default configured remote"
 165                 echo "for your current branch, you must specify a branch on the command line."
 166         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
 167                 . git-parse-remote
 168                 error_on_missing_default_upstream "pull" $op_type $op_prep \
 169                         "git pull <repository> <refspec>"
 170         else
 171                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 172                 echo "from the remote, but no such ref was fetched."
 173         fi
 174         exit 1
 175 }
 176
 177 test true = "$rebase" && {
 178         if ! git rev-parse -q --verify HEAD >/dev/null
 179         then
 180                 # On an unborn branch
 181                 if test -f "$GIT_DIR/index"
 182                 then
 183                         die "updating an unborn branch with changes added to the index"
 184                 fi
 185         else
 186                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 187         fi
 188         oldremoteref= &&
 189         . git-parse-remote &&
 190         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 191         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 192         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 193         do
 194                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 195                 then
 196                         oldremoteref="$reflog"
 197                         break
 198                 fi
 199         done
 200 }
 201 orig_head=$(git rev-parse -q --verify HEAD)
 202 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 203 test -z "$dry_run" || exit 0
 204
 205 curr_head=$(git rev-parse -q --verify HEAD)
 206 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 207 then
 208         # The fetch involved updating the current branch.
 209
 210         # The working tree and the index file is still based on the
 211         # $orig_head commit, but we are merging into $curr_head.
 212         # First update the working tree to match $curr_head.
 213
 214         echo >&2 "Warning: fetch updated the current branch head."
 215         echo >&2 "Warning: fast-forwarding your working tree from"
 216         echo >&2 "Warning: commit $orig_head."
 217         git update-index -q --refresh
 218         git read-tree -u -m "$orig_head" "$curr_head" ||
 219                 die 'Cannot fast-forward your working tree.
 220 After making sure that you saved anything precious from
 221 $ git diff '$orig_head'
 222 output, run
 223 $ git reset --hard
 224 to recover.'
 225
 226 fi
 227
 228 merge_head=$(sed -e '/  not-for-merge   /d' \
 229         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 230         tr '\012' ' ')
 231
 232 case "$merge_head" in
 233 '')
 234         error_on_no_merge_candidates "$@"
 235         ;;
 236 ?*' '?*)
 237         if test -z "$orig_head"
 238         then
 239                 die "Cannot merge multiple branches into empty head"
 240         fi
 241         if test true = "$rebase"
 242         then
 243                 die "Cannot rebase onto multiple branches"
 244         fi
 245         ;;
 246 esac
 247
 248 if test -z "$orig_head"
 249 then
 250         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 251         git read-tree --reset -u HEAD || exit 1
 252         exit
 253 fi
 254
 255 if test true = "$rebase"
 256 then
 257         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 258         if test "$oldremoteref" = "$o"
 259         then
 260                 unset oldremoteref
 261         fi
 262 fi
 263
 264 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 265 case "$rebase" in
 266 true)
 267         eval="git-rebase $diffstat $strategy_args $merge_args"
 268         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 269         ;;
 270 *)
 271         eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
 272         eval="$eval  $log_arg $strategy_args $merge_args"
 273         eval="$eval \"\$merge_name\" HEAD $merge_head $verbosity"
 274         ;;
 275 esac
 276 eval "exec $eval"