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