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