git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 SUBDIRECTORY_OK=Yes
   6 . git-sh-setup
   7 set_reflog_action "fetch $*"
   8 cd_to_toplevel ;# probably unnecessary...
   9
  10 . git-parse-remote
  11 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  12 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  13
  14 LF='
  15 '
  16 IFS="$LF"
  17
  18 no_tags=
  19 tags=
  20 append=
  21 force=
  22 verbose=
  23 update_head_ok=
  24 exec=
  25 keep=
  26 shallow_depth=
  27 no_progress=
  28 test -t 1 || no_progress=--no-progress
  29 while case "$#" in 0) break ;; esac
  30 do
  31         case "$1" in
  32         -a|--a|--ap|--app|--appe|--appen|--append)
  33                 append=t
  34                 ;;
  35         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  36         --upload-pa|--upload-pac|--upload-pack)
  37                 shift
  38                 exec="--upload-pack=$1"
  39                 ;;
  40         --upl=*|--uplo=*|--uploa=*|--upload=*|\
  41         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
  42                 exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
  43                 shift
  44                 ;;
  45         -f|--f|--fo|--for|--forc|--force)
  46                 force=t
  47                 ;;
  48         -t|--t|--ta|--tag|--tags)
  49                 tags=t
  50                 ;;
  51         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  52                 no_tags=t
  53                 ;;
  54         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  55         --update-he|--update-hea|--update-head|--update-head-|\
  56         --update-head-o|--update-head-ok)
  57                 update_head_ok=t
  58                 ;;
  59         -v|--verbose)
  60                 verbose=Yes
  61                 ;;
  62         -k|--k|--ke|--kee|--keep)
  63                 keep='-k -k'
  64                 ;;
  65         --depth=*)
  66                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
  67                 ;;
  68         --depth)
  69                 shift
  70                 shallow_depth="--depth=$1"
  71                 ;;
  72         -*)
  73                 usage
  74                 ;;
  75         *)
  76                 break
  77                 ;;
  78         esac
  79         shift
  80 done
  81
  82 case "$#" in
  83 0)
  84         origin=$(get_default_remote)
  85         test -n "$(get_remote_url ${origin})" ||
  86                 die "Where do you want to fetch from today?"
  87         set x $origin ; shift ;;
  88 esac
  89
  90 if test -z "$exec"
  91 then
  92         # No command line override and we have configuration for the remote.
  93         exec="--upload-pack=$(get_uploadpack $1)"
  94 fi
  95
  96 remote_nick="$1"
  97 remote=$(get_remote_url "$@")
  98 refs=
  99 rref=
 100 rsync_slurped_objects=
 101
 102 if test "" = "$append"
 103 then
 104         : >"$GIT_DIR/FETCH_HEAD"
 105 fi
 106
 107 # Global that is reused later
 108 ls_remote_result=$(git ls-remote $exec "$remote") ||
 109         die "Cannot get the repository state from $remote"
 110
 111 append_fetch_head () {
 112         flags=
 113         test -n "$verbose" && flags="$flags -v"
 114         test -n "$force" && flags="$flags -f"
 115         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 116                 git-fetch--tool $flags append-fetch-head "$@"
 117 }
 118
 119 # updating the current HEAD with git-fetch in a bare
 120 # repository is always fine.
 121 if test -z "$update_head_ok" && test $(is_bare_repository) = false
 122 then
 123         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 124 fi
 125
 126 # Allow --notags from remote.$1.tagopt
 127 case "$tags$no_tags" in
 128 '')
 129         case "$(git-config --get "remote.$1.tagopt")" in
 130         --no-tags)
 131                 no_tags=t ;;
 132         esac
 133 esac
 134
 135 # If --tags (and later --heads or --all) is specified, then we are
 136 # not talking about defaults stored in Pull: line of remotes or
 137 # branches file, and just fetch those and refspecs explicitly given.
 138 # Otherwise we do what we always did.
 139
 140 reflist=$(get_remote_refs_for_fetch "$@")
 141 if test "$tags"
 142 then
 143         taglist=`IFS='  ' &&
 144                   echo "$ls_remote_result" |
 145                   git-show-ref --exclude-existing=refs/tags/ |
 146                   while read sha1 name
 147                   do
 148                         echo ".${name}:${name}"
 149                   done` || exit
 150         if test "$#" -gt 1
 151         then
 152                 # remote URL plus explicit refspecs; we need to merge them.
 153                 reflist="$reflist$LF$taglist"
 154         else
 155                 # No explicit refspecs; fetch tags only.
 156                 reflist=$taglist
 157         fi
 158 fi
 159
 160 fetch_all_at_once () {
 161
 162   eval=$(echo "$1" | git-fetch--tool parse-reflist "-")
 163   eval "$eval"
 164
 165     ( : subshell because we muck with IFS
 166       IFS="     $LF"
 167       (
 168         if test "$remote" = . ; then
 169             git-show-ref $rref || echo failed "$remote"
 170         elif test -f "$remote" ; then
 171             test -n "$shallow_depth" &&
 172                 die "shallow clone with bundle is not supported"
 173             git-bundle unbundle "$remote" $rref ||
 174             echo failed "$remote"
 175         else
 176           git-fetch-pack --thin $exec $keep $shallow_depth $no_progress \
 177                 "$remote" $rref ||
 178           echo failed "$remote"
 179         fi
 180       ) |
 181       (
 182         flags=
 183         test -n "$verbose" && flags="$flags -v"
 184         test -n "$force" && flags="$flags -f"
 185         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
 186                 git-fetch--tool $flags native-store \
 187                         "$remote" "$remote_nick" "$refs"
 188       )
 189     ) || exit
 190
 191 }
 192
 193 fetch_per_ref () {
 194   reflist="$1"
 195   refs=
 196   rref=
 197
 198   for ref in $reflist
 199   do
 200       refs="$refs$LF$ref"
 201
 202       # These are relative path from $GIT_DIR, typically starting at refs/
 203       # but may be HEAD
 204       if expr "z$ref" : 'z\.' >/dev/null
 205       then
 206           not_for_merge=t
 207           ref=$(expr "z$ref" : 'z\.\(.*\)')
 208       else
 209           not_for_merge=
 210       fi
 211       if expr "z$ref" : 'z+' >/dev/null
 212       then
 213           single_force=t
 214           ref=$(expr "z$ref" : 'z+\(.*\)')
 215       else
 216           single_force=
 217       fi
 218       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 219       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 220
 221       rref="$rref$LF$remote_name"
 222
 223       # There are transports that can fetch only one head at a time...
 224       case "$remote" in
 225       http://* | https://* | ftp://*)
 226           test -n "$shallow_depth" &&
 227                 die "shallow clone with http not supported"
 228           proto=`expr "$remote" : '\([^:]*\):'`
 229           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 230               curl_extra_args="-k"
 231           fi
 232           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 233                 "`git-config --bool http.noEPSV`" = true ]; then
 234               noepsv_opt="--disable-epsv"
 235           fi
 236
 237           # Find $remote_name from ls-remote output.
 238           head=$(
 239                 IFS='   '
 240                 echo "$ls_remote_result" |
 241                 while read sha1 name
 242                 do
 243                         test "z$name" = "z$remote_name" || continue
 244                         echo "$sha1"
 245                         break
 246                 done
 247           )
 248           expr "z$head" : "z$_x40\$" >/dev/null ||
 249                 die "No such ref $remote_name at $remote"
 250           echo >&2 "Fetching $remote_name from $remote using $proto"
 251           git-http-fetch -v -a "$head" "$remote/" || exit
 252           ;;
 253       rsync://*)
 254           test -n "$shallow_depth" &&
 255                 die "shallow clone with rsync not supported"
 256           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 257           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 258           head=$(git-rev-parse --verify TMP_HEAD)
 259           rm -f "$TMP_HEAD"
 260           test "$rsync_slurped_objects" || {
 261               rsync -av --ignore-existing --exclude info \
 262                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 263
 264               # Look at objects/info/alternates for rsync -- http will
 265               # support it natively and git native ones will do it on
 266               # the remote end.  Not having that file is not a crime.
 267               rsync -q "$remote/objects/info/alternates" \
 268                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 269                   rm -f "$GIT_DIR/TMP_ALT"
 270               if test -f "$GIT_DIR/TMP_ALT"
 271               then
 272                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 273                   while read alt
 274                   do
 275                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 276                       echo >&2 "Getting alternate: $alt"
 277                       rsync -av --ignore-existing --exclude info \
 278                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 279                   done
 280                   rm -f "$GIT_DIR/TMP_ALT"
 281               fi
 282               rsync_slurped_objects=t
 283           }
 284           ;;
 285       esac
 286
 287       append_fetch_head "$head" "$remote" \
 288           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
 289
 290   done
 291
 292 }
 293
 294 fetch_main () {
 295         case "$remote" in
 296         http://* | https://* | ftp://* | rsync://* )
 297                 fetch_per_ref "$@"
 298                 ;;
 299         *)
 300                 fetch_all_at_once "$@"
 301                 ;;
 302         esac
 303 }
 304
 305 fetch_main "$reflist" || exit
 306
 307 # automated tag following
 308 case "$no_tags$tags" in
 309 '')
 310         case "$reflist" in
 311         *:refs/*)
 312                 # effective only when we are following remote branch
 313                 # using local tracking branch.
 314                 taglist=$(IFS=' ' &&
 315                 echo "$ls_remote_result" |
 316                 git-show-ref --exclude-existing=refs/tags/ |
 317                 while read sha1 name
 318                 do
 319                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 320                         echo >&2 "Auto-following $name"
 321                         echo ".${name}:${name}"
 322                 done)
 323         esac
 324         case "$taglist" in
 325         '') ;;
 326         ?*)
 327                 # do not deepen a shallow tree when following tags
 328                 shallow_depth=
 329                 fetch_main "$taglist" || exit ;;
 330         esac
 331 esac
 332
 333 # If the original head was empty (i.e. no "master" yet), or
 334 # if we were told not to worry, we do not have to check.
 335 case "$orig_head" in
 336 '')
 337         ;;
 338 ?*)
 339         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 340         if test "$curr_head" != "$orig_head"
 341         then
 342             git-update-ref \
 343                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
 344                         HEAD "$orig_head"
 345                 die "Cannot fetch into the current branch."
 346         fi
 347         ;;
 348 esac