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