git-parse-remote.sh

   1 #!/bin/sh
   2
   3 # git-ls-remote could be called from outside a git managed repository;
   4 # this would fail in that case and would issue an error message.
   5 GIT_DIR=$(git-rev-parse --git-dir 2>/dev/null) || :;
   6
   7 get_data_source () {
   8         case "$1" in
   9         */*)
  10                 # Not so fast.  This could be the partial URL shorthand...
  11                 token=$(expr "z$1" : 'z\([^/]*\)/')
  12                 remainder=$(expr "z$1" : 'z[^/]*/\(.*\)')
  13                 if test -f "$GIT_DIR/branches/$token"
  14                 then
  15                         echo branches-partial
  16                 else
  17                         echo ''
  18                 fi
  19                 ;;
  20         *)
  21                 if test -f "$GIT_DIR/remotes/$1"
  22                 then
  23                         echo remotes
  24                 elif test -f "$GIT_DIR/branches/$1"
  25                 then
  26                         echo branches
  27                 else
  28                         echo ''
  29                 fi ;;
  30         esac
  31 }
  32
  33 get_remote_url () {
  34         data_source=$(get_data_source "$1")
  35         case "$data_source" in
  36         '')
  37                 echo "$1" ;;
  38         remotes)
  39                 sed -ne '/^URL: */{
  40                         s///p
  41                         q
  42                 }' "$GIT_DIR/remotes/$1" ;;
  43         branches)
  44                 sed -e 's/#.*//' "$GIT_DIR/branches/$1" ;;
  45         branches-partial)
  46                 token=$(expr "z$1" : 'z\([^/]*\)/')
  47                 remainder=$(expr "z$1" : 'z[^/]*/\(.*\)')
  48                 url=$(sed -e 's/#.*//' "$GIT_DIR/branches/$token")
  49                 echo "$url/$remainder"
  50                 ;;
  51         *)
  52                 die "internal error: get-remote-url $1" ;;
  53         esac
  54 }
  55
  56 get_remote_default_refs_for_push () {
  57         data_source=$(get_data_source "$1")
  58         case "$data_source" in
  59         '' | branches | branches-partial)
  60                 ;; # no default push mapping, just send matching refs.
  61         remotes)
  62                 sed -ne '/^Push: */{
  63                         s///p
  64                 }' "$GIT_DIR/remotes/$1" ;;
  65         *)
  66                 die "internal error: get-remote-default-ref-for-push $1" ;;
  67         esac
  68 }
  69
  70 # Subroutine to canonicalize remote:local notation.
  71 canon_refs_list_for_fetch () {
  72         # Leave only the first one alone; add prefix . to the rest
  73         # to prevent the secondary branches to be merged by default.
  74         dot_prefix=
  75         for ref
  76         do
  77                 force=
  78                 case "$ref" in
  79                 +*)
  80                         ref=$(expr "z$ref" : 'z+\(.*\)')
  81                         force=+
  82                         ;;
  83                 esac
  84                 expr "z$ref" : 'z.*:' >/dev/null || ref="${ref}:"
  85                 remote=$(expr "z$ref" : 'z\([^:]*\):')
  86                 local=$(expr "z$ref" : 'z[^:]*:\(.*\)')
  87                 case "$remote" in
  88                 '') remote=HEAD ;;
  89                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
  90                 heads/* | tags/* | remotes/* ) remote="refs/$remote" ;;
  91                 *) remote="refs/heads/$remote" ;;
  92                 esac
  93                 case "$local" in
  94                 '') local= ;;
  95                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
  96                 heads/* | tags/* | remotes/* ) local="refs/$local" ;;
  97                 *) local="refs/heads/$local" ;;
  98                 esac
  99
 100                 if local_ref_name=$(expr "z$local" : 'zrefs/\(.*\)')
 101                 then
 102                    git-check-ref-format "$local_ref_name" ||
 103                    die "* refusing to create funny ref '$local_ref_name' locally"
 104                 fi
 105                 echo "${dot_prefix}${force}${remote}:${local}"
 106                 dot_prefix=.
 107         done
 108 }
 109
 110 # Returns list of src: (no store), or src:dst (store)
 111 get_remote_default_refs_for_fetch () {
 112         data_source=$(get_data_source "$1")
 113         case "$data_source" in
 114         '' | branches-partial)
 115                 echo "HEAD:" ;;
 116         branches)
 117                 remote_branch=$(sed -ne '/#/s/.*#//p' "$GIT_DIR/branches/$1")
 118                 case "$remote_branch" in '') remote_branch=master ;; esac
 119                 echo "refs/heads/${remote_branch}:refs/heads/$1"
 120                 ;;
 121         remotes)
 122                 # This prefixes the second and later default refspecs
 123                 # with a '.', to signal git-fetch to mark them
 124                 # not-for-merge.
 125                 canon_refs_list_for_fetch $(sed -ne '/^Pull: */{
 126                                                 s///p
 127                                         }' "$GIT_DIR/remotes/$1")
 128                 ;;
 129         *)
 130                 die "internal error: get-remote-default-ref-for-push $1" ;;
 131         esac
 132 }
 133
 134 get_remote_refs_for_push () {
 135         case "$#" in
 136         0) die "internal error: get-remote-refs-for-push." ;;
 137         1) get_remote_default_refs_for_push "$@" ;;
 138         *) shift; echo "$@" ;;
 139         esac
 140 }
 141
 142 get_remote_refs_for_fetch () {
 143         case "$#" in
 144         0)
 145             die "internal error: get-remote-refs-for-fetch." ;;
 146         1)
 147             get_remote_default_refs_for_fetch "$@" ;;
 148         *)
 149             shift
 150             tag_just_seen=
 151             for ref
 152             do
 153                 if test "$tag_just_seen"
 154                 then
 155                     echo "refs/tags/${ref}:refs/tags/${ref}"
 156                     tag_just_seen=
 157                     continue
 158                 else
 159                     case "$ref" in
 160                     tag)
 161                         tag_just_seen=yes
 162                         continue
 163                         ;;
 164                     esac
 165                 fi
 166                 canon_refs_list_for_fetch "$ref"
 167             done
 168             ;;
 169         esac
 170 }
 171
 172 resolve_alternates () {
 173         # original URL (xxx.git)
 174         top_=`expr "z$1" : 'z\([^:]*:/*[^/]*\)/'`
 175         while read path
 176         do
 177                 case "$path" in
 178                 \#* | '')
 179                         continue ;;
 180                 /*)
 181                         echo "$top_$path/" ;;
 182                 ../*)
 183                         # relative -- ugly but seems to work.
 184                         echo "$1/objects/$path/" ;;
 185                 *)
 186                         # exit code may not be caught by the reader.
 187                         echo "bad alternate: $path"
 188                         exit 1 ;;
 189                 esac
 190         done
 191 }