git-fetch-script

   1 #!/bin/sh
   2 #
   3 . git-sh-setup-script || die "Not a git archive"
   4 . git-parse-remote-script
   5 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
   6 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
   7
   8 append=
   9 force=
  10 update_head_ok=
  11 while case "$#" in 0) break ;; esac
  12 do
  13         case "$1" in
  14         -a|--a|--ap|--app|--appe|--appen|--append)
  15                 append=t
  16                 ;;
  17         -f|--f|--fo|--for|--forc|--force)
  18                 force=t
  19                 ;;
  20         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  21         --update-he|--update-hea|--update-head|--update-head-|\
  22         --update-head-o|--update-head-ok)
  23                 update_head_ok=t
  24                 ;;
  25         *)
  26                 break
  27                 ;;
  28         esac
  29         shift
  30 done
  31
  32 case "$#" in
  33 0)
  34         test -f "$GIT_DIR/branches/origin" ||
  35                 test -f "$GIT_DIR/remotes/origin" ||
  36                         die "Where do you want to fetch from today?"
  37         set origin ;;
  38 esac
  39
  40 remote_nick="$1"
  41 remote=$(get_remote_url "$@")
  42 refs=
  43 rref=
  44 rsync_slurped_objects=
  45
  46 if test "" = "$append"
  47 then
  48         : >$GIT_DIR/FETCH_HEAD
  49 fi
  50
  51 append_fetch_head () {
  52     head_="$1"
  53     remote_="$2"
  54     remote_name_="$3"
  55     remote_nick_="$4"
  56     local_name_="$5"
  57
  58     # 2.6.11-tree tag would not be happy to be fed to resolve.
  59     if git-cat-file commit "$head_" >/dev/null 2>&1
  60     then
  61         headc_=$(git-rev-parse --verify "$head_^0") || exit
  62         note_="$headc_  $remote_name_ from $remote_nick_"
  63         echo "$note_" >>$GIT_DIR/FETCH_HEAD
  64         echo >&2 "* committish: $note_"
  65     else
  66         echo >&2 "* non-commit: $note_"
  67     fi
  68     if test "$local_name_" != ""
  69     then
  70         # We are storing the head locally.  Make sure that it is
  71         # a fast forward (aka "reverse push").
  72         fast_forward_local "$local_name_" "$head_" "$remote_" "$remote_name_"
  73     fi
  74 }
  75
  76 fast_forward_local () {
  77     case "$1" in
  78     refs/tags/*)
  79         # Tags need not be pointing at commits so there
  80         # is no way to guarantee "fast-forward" anyway.
  81         if test -f "$GIT_DIR/$1"
  82         then
  83                 echo >&2 "* $1: updating with $4"
  84                 echo >&2 "  from $3."
  85         else
  86                 echo >&2 "* $1: storing $4"
  87                 echo >&2 "  from $3."
  88         fi
  89         echo "$2" >"$GIT_DIR/$1" ;;
  90
  91     refs/heads/*)
  92         # NEEDSWORK: use the same cmpxchg protocol here.
  93         echo "$2" >"$GIT_DIR/$1.lock"
  94         if test -f "$GIT_DIR/$1"
  95         then
  96             local=$(git-rev-parse --verify "$1^0") &&
  97             mb=$(git-merge-base "$local" "$2") &&
  98             case "$2,$mb" in
  99             $local,*)
 100                 echo >&2 "* $1: same as $4"
 101                 echo >&2 "  from $3"
 102                 ;;
 103             *,$local)
 104                 echo >&2 "* $1: fast forward to $4"
 105                 echo >&2 "  from $3"
 106                 ;;
 107             *)
 108                 false
 109                 ;;
 110             esac || {
 111                 echo >&2 "* $1: does not fast forward to $4"
 112                 case "$force,$single_force" in
 113                 t,* | *,t)
 114                         echo >&2 "  from $3; forcing update."
 115                         ;;
 116                 *)
 117                         mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
 118                         echo >&2 "  from $3; leaving it in '$1.remote'"
 119                         ;;
 120                 esac
 121             }
 122         else
 123                 echo >&2 "* $1: storing $4"
 124                 echo >&2 "  from $3."
 125         fi
 126         test -f "$GIT_DIR/$1.lock" &&
 127             mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
 128         ;;
 129     esac
 130 }
 131
 132 case "$update_head_ok" in
 133 '')
 134         orig_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
 135         ;;
 136 esac
 137
 138 for ref in $(get_remote_refs_for_fetch "$@")
 139 do
 140     refs="$refs $ref"
 141
 142     # These are relative path from $GIT_DIR, typically starting at refs/
 143     # but may be HEAD
 144     if expr "$ref" : '\+' >/dev/null
 145     then
 146         single_force=t
 147         ref=$(expr "$ref" : '\+\(.*\)')
 148     else
 149         single_force=
 150     fi
 151     remote_name=$(expr "$ref" : '\([^:]*\):')
 152     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 153
 154     rref="$rref $remote_name"
 155
 156     # There are transports that can fetch only one head at a time...
 157     case "$remote" in
 158     http://* | https://*)
 159         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 160             curl_extra_args="-k"
 161         fi
 162         head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 163         expr "$head" : "$_x40\$" >/dev/null ||
 164                 die "Failed to fetch $remote_name from $remote"
 165         echo Fetching "$remote_name from $remote" using http
 166         git-http-pull -v -a "$head" "$remote/" || exit
 167         ;;
 168     rsync://*)
 169         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 170         rsync -L "$remote/$remote_name" "$TMP_HEAD" || exit 1
 171         head=$(git-rev-parse TMP_HEAD)
 172         rm -f "$TMP_HEAD"
 173         test "$rsync_slurped_objects" || {
 174             rsync -avz --ignore-existing "$remote/objects/" \
 175                 "$GIT_OBJECT_DIRECTORY/" || exit
 176             rsync_slurped_objects=t
 177         }
 178         ;;
 179     *)
 180         # We will do git native transport with just one call later.
 181         continue ;;
 182     esac
 183
 184     append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"
 185
 186 done
 187
 188 case "$remote" in
 189 http://* | https://* | rsync://* )
 190     ;; # we are already done.
 191 *)
 192     git-fetch-pack "$remote" $rref |
 193     while read sha1 remote_name
 194     do
 195         found=
 196         single_force=
 197         for ref in $refs
 198         do
 199             case "$ref" in
 200             +$remote_name:*)
 201                 single_force=t
 202                 found="$ref"
 203                 break ;;
 204             $remote_name:*)
 205                 found="$ref"
 206                 break ;;
 207             esac
 208         done
 209
 210         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 211         append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
 212     done
 213     ;;
 214 esac
 215
 216 # If the original head was empty (i.e. no "master" yet), or
 217 # if we were told not to worry, we do not have to check.
 218 case ",$update_head_ok,$orig_head," in
 219 *,, | t,* )
 220         ;;
 221 *)
 222         curr_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
 223         if test "$curr_head" != "$orig_head"
 224         then
 225                 echo "$orig_head" >$GIT_DIR/HEAD
 226                 die "Cannot fetch into the current branch."
 227         fi
 228         ;;
 229 esac