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|--ff-only] [--[no-]rebase|--rebase=preserve] [-s strategy]... [<fetch-options>] <repo> <head>...'
   8 LONG_USAGE='Fetch one or more remote refs and integrate it/them with the current HEAD.'
   9 SUBDIRECTORY_OK=Yes
  10 OPTIONS_SPEC=
  11 . git-sh-setup
  12 . git-sh-i18n
  13 set_reflog_action "pull${1+ $*}"
  14 require_work_tree_exists
  15 cd_to_toplevel
  16
  17
  18 die_conflict () {
  19     git diff-index --cached --name-status -r --ignore-submodules HEAD --
  20     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  21         die "$(gettext "Pull is not possible because you have unmerged files.
  22 Please, fix them up in the work tree, and then use 'git add/rm <file>'
  23 as appropriate to mark resolution and make a commit.")"
  24     else
  25         die "$(gettext "Pull is not possible because you have unmerged files.")"
  26     fi
  27 }
  28
  29 die_merge () {
  30     if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  31         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
  32 Please, commit your changes before you can merge.")"
  33     else
  34         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
  35     fi
  36 }
  37
  38 test -z "$(git ls-files -u)" || die_conflict
  39 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
  40
  41 bool_or_string_config () {
  42         git config --bool "$1" 2>/dev/null || git config "$1"
  43 }
  44
  45 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  46 log_arg= verbosity= progress= recurse_submodules= verify_signatures=
  47 merge_args= edit= rebase_args=
  48 curr_branch=$(git symbolic-ref -q HEAD)
  49 curr_branch_short="${curr_branch#refs/heads/}"
  50 rebase=$(bool_or_string_config branch.$curr_branch_short.rebase)
  51 if test -z "$rebase"
  52 then
  53         rebase=$(bool_or_string_config pull.rebase)
  54 fi
  55
  56 # Setup default fast-forward options via `pull.ff`
  57 pull_ff=$(bool_or_string_config pull.ff)
  58 case "$pull_ff" in
  59 true)
  60         no_ff=--ff
  61         ;;
  62 false)
  63         no_ff=--no-ff
  64         ;;
  65 only)
  66         ff_only=--ff-only
  67         ;;
  68 esac
  69
  70
  71 dry_run=
  72 while :
  73 do
  74         case "$1" in
  75         -q|--quiet)
  76                 verbosity="$verbosity -q" ;;
  77         -v|--verbose)
  78                 verbosity="$verbosity -v" ;;
  79         --progress)
  80                 progress=--progress ;;
  81         --no-progress)
  82                 progress=--no-progress ;;
  83         -n|--no-stat|--no-summary)
  84                 diffstat=--no-stat ;;
  85         --stat|--summary)
  86                 diffstat=--stat ;;
  87         --log|--log=*|--no-log)
  88                 log_arg="$1" ;;
  89         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  90                 no_commit=--no-commit ;;
  91         --c|--co|--com|--comm|--commi|--commit)
  92                 no_commit=--commit ;;
  93         -e|--edit)
  94                 edit=--edit ;;
  95         --no-edit)
  96                 edit=--no-edit ;;
  97         --sq|--squ|--squa|--squas|--squash)
  98                 squash=--squash ;;
  99         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
 100                 squash=--no-squash ;;
 101         --ff)
 102                 no_ff=--ff ;;
 103         --no-ff)
 104                 no_ff=--no-ff ;;
 105         --ff-only)
 106                 ff_only=--ff-only ;;
 107         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 108                 --strateg=*|--strategy=*|\
 109         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 110                 case "$#,$1" in
 111                 *,*=*)
 112                         strategy=$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 113                 1,*)
 114                         usage ;;
 115                 *)
 116                         strategy="$2"
 117                         shift ;;
 118                 esac
 119                 strategy_args="${strategy_args}-s $strategy "
 120                 ;;
 121         -X*)
 122                 case "$#,$1" in
 123                 1,-X)
 124                         usage ;;
 125                 *,-X)
 126                         xx="-X $(git rev-parse --sq-quote "$2")"
 127                         shift ;;
 128                 *,*)
 129                         xx=$(git rev-parse --sq-quote "$1") ;;
 130                 esac
 131                 merge_args="$merge_args$xx "
 132                 ;;
 133         -r=*|--r=*|--re=*|--reb=*|--reba=*|--rebas=*|--rebase=*)
 134                 rebase="${1#*=}"
 135                 ;;
 136         -r|--r|--re|--reb|--reba|--rebas|--rebase)
 137                 rebase=true
 138                 ;;
 139         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 140                 rebase=false
 141                 ;;
 142         --recurse-submodules)
 143                 recurse_submodules=--recurse-submodules
 144                 ;;
 145         --recurse-submodules=*)
 146                 recurse_submodules="$1"
 147                 ;;
 148         --no-recurse-submodules)
 149                 recurse_submodules=--no-recurse-submodules
 150                 ;;
 151         --verify-signatures)
 152                 verify_signatures=--verify-signatures
 153                 ;;
 154         --no-verify-signatures)
 155                 verify_signatures=--no-verify-signatures
 156                 ;;
 157         --gpg-sign|-S)
 158                 gpg_sign_args=-S
 159                 ;;
 160         --gpg-sign=*)
 161                 gpg_sign_args=$(git rev-parse --sq-quote "-S${1#--gpg-sign=}")
 162                 ;;
 163         -S*)
 164                 gpg_sign_args=$(git rev-parse --sq-quote "$1")
 165                 ;;
 166         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
 167                 dry_run=--dry-run
 168                 ;;
 169         -h|--help-all)
 170                 usage
 171                 ;;
 172         *)
 173                 # Pass thru anything that may be meant for fetch.
 174                 break
 175                 ;;
 176         esac
 177         shift
 178 done
 179
 180 case "$rebase" in
 181 preserve)
 182         rebase=true
 183         rebase_args=--preserve-merges
 184         ;;
 185 true|false|'')
 186         ;;
 187 *)
 188         echo "Invalid value for --rebase, should be true, false, or preserve"
 189         usage
 190         exit 1
 191         ;;
 192 esac
 193
 194 error_on_no_merge_candidates () {
 195         exec >&2
 196
 197         if test true = "$rebase"
 198         then
 199                 op_type=rebase
 200                 op_prep=against
 201         else
 202                 op_type=merge
 203                 op_prep=with
 204         fi
 205
 206         upstream=$(git config "branch.$curr_branch_short.merge")
 207         remote=$(git config "branch.$curr_branch_short.remote")
 208
 209         if [ $# -gt 1 ]; then
 210                 if [ "$rebase" = true ]; then
 211                         printf "There is no candidate for rebasing against "
 212                 else
 213                         printf "There are no candidates for merging "
 214                 fi
 215                 echo "among the refs that you just fetched."
 216                 echo "Generally this means that you provided a wildcard refspec which had no"
 217                 echo "matches on the remote end."
 218         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 219                 echo "You asked to pull from the remote '$1', but did not specify"
 220                 echo "a branch. Because this is not the default configured remote"
 221                 echo "for your current branch, you must specify a branch on the command line."
 222         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
 223                 . git-parse-remote
 224                 error_on_missing_default_upstream "pull" $op_type $op_prep \
 225                         "git pull <remote> <branch>"
 226         else
 227                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 228                 echo "from the remote, but no such ref was fetched."
 229         fi
 230         exit 1
 231 }
 232
 233 test true = "$rebase" && {
 234         if ! git rev-parse -q --verify HEAD >/dev/null
 235         then
 236                 # On an unborn branch
 237                 if test -f "$GIT_DIR/index"
 238                 then
 239                         die "$(gettext "updating an unborn branch with changes added to the index")"
 240                 fi
 241         else
 242                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
 243         fi
 244         oldremoteref= &&
 245         test -n "$curr_branch" &&
 246         . git-parse-remote &&
 247         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 248         oldremoteref=$(git merge-base --fork-point "$remoteref" $curr_branch 2>/dev/null)
 249 }
 250 orig_head=$(git rev-parse -q --verify HEAD)
 251 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 252 test -z "$dry_run" || exit 0
 253
 254 curr_head=$(git rev-parse -q --verify HEAD)
 255 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 256 then
 257         # The fetch involved updating the current branch.
 258
 259         # The working tree and the index file is still based on the
 260         # $orig_head commit, but we are merging into $curr_head.
 261         # First update the working tree to match $curr_head.
 262
 263         eval_gettextln "Warning: fetch updated the current branch head.
 264 Warning: fast-forwarding your working tree from
 265 Warning: commit \$orig_head." >&2
 266         git update-index -q --refresh
 267         git read-tree -u -m "$orig_head" "$curr_head" ||
 268                 die "$(eval_gettext "Cannot fast-forward your working tree.
 269 After making sure that you saved anything precious from
 270 $ git diff \$orig_head
 271 output, run
 272 $ git reset --hard
 273 to recover.")"
 274
 275 fi
 276
 277 merge_head=$(sed -e '/  not-for-merge   /d' \
 278         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 279         tr '\012' ' ')
 280
 281 case "$merge_head" in
 282 '')
 283         error_on_no_merge_candidates "$@"
 284         ;;
 285 ?*' '?*)
 286         if test -z "$orig_head"
 287         then
 288                 die "$(gettext "Cannot merge multiple branches into empty head")"
 289         fi
 290         if test true = "$rebase"
 291         then
 292                 die "$(gettext "Cannot rebase onto multiple branches")"
 293         fi
 294         ;;
 295 esac
 296
 297 # Pulling into unborn branch: a shorthand for branching off
 298 # FETCH_HEAD, for lazy typers.
 299 if test -z "$orig_head"
 300 then
 301         # Two-way merge: we claim the index is based on an empty tree,
 302         # and try to fast-forward to HEAD.  This ensures we will not
 303         # lose index/worktree changes that the user already made on
 304         # the unborn branch.
 305         empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
 306         git read-tree -m -u $empty_tree $merge_head &&
 307         git update-ref -m "initial pull" HEAD $merge_head "$curr_head"
 308         exit
 309 fi
 310
 311 if test true = "$rebase"
 312 then
 313         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
 314         if test "$oldremoteref" = "$o"
 315         then
 316                 unset oldremoteref
 317         fi
 318 fi
 319
 320 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 321 case "$rebase" in
 322 true)
 323         eval="git-rebase $diffstat $strategy_args $merge_args $rebase_args $verbosity"
 324         eval="$eval $gpg_sign_args"
 325         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 326         ;;
 327 *)
 328         eval="git-merge $diffstat $no_commit $verify_signatures $edit $squash $no_ff $ff_only"
 329         eval="$eval $log_arg $strategy_args $merge_args $verbosity $progress"
 330         eval="$eval $gpg_sign_args"
 331         eval="$eval \"\$merge_name\" HEAD $merge_head"
 332         ;;
 333 esac
 334 eval "exec $eval"