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