cg-export

   1 #!/usr/bin/env bash
   2 #
   3 # Export contents of a particular revision
   4 # Copyright (c) Johannes E. Schindelin, 2005
   5 #
   6 # Takes a destination and optionally a tree ID as a parameter,
   7 # defaulting to 'HEAD'.
   8 #
   9 # The destination can be either a `.tar`, `.tar.gz`, `.tar.bz2` or `.tgz`
  10 # for generating a tarball, or `.zip` for generating a zip file. Destination
  11 # specifiers not ending by any of these extensions are assumed to be
  12 # directory names, and the tree is exported to the given directory.
  13 #
  14 # OPTIONS
  15 # -------
  16 # -r TREE_ID:: Specify the tree version to export
  17 #       Base the export on the given tree.
  18
  19 # Testsuite: TODO
  20
  21 USAGE="cg-export [-r TREE_ID] DESTFILE"
  22 _git_requires_root=1
  23 _git_wc_unneeded=1
  24
  25 . "${COGITO_LIB}"cg-Xlib || exit 1
  26
  27 id=
  28 while optparse; do
  29         if optparse -r=; then
  30                 # We do not resolve to tree id since git-tar-tree can
  31                 # utilize some commit information.
  32                 id="$(cg-object-id -c "$OPTARG" 2>/dev/null)" || id="$OPTARG"
  33         else
  34                 optfail
  35         fi
  36 done
  37
  38 if [ -z "$id" ]; then
  39         id="$(cg-object-id -c)"
  40 fi
  41
  42 dest="${ARGS[0]}"
  43
  44 ([ -n "$dest" ] && [ -n "$id" ]) || usage
  45
  46 [ -e "$dest" ] && die "$dest already exists."
  47
  48 case "$dest" in
  49         *.tar|*.tar.gz|*.tar.bz2|*.tgz|*.zip)
  50                 base="${dest%.tar*}"
  51                 base="${base%.tgz}"
  52                 base="${base%.zip}"
  53                 ext="${dest#$base}"
  54                 base="${base##*/}/"
  55                 case "$ext" in
  56                 .tar.gz|.tgz)
  57                         git-archive --format=tar --prefix="$base" "$id" | gzip -c9 >"$dest"
  58                         ;;
  59                 .tar.bz2)
  60                         git-archive --format=tar --prefix="$base" "$id" | bzip2 -c >"$dest"
  61                         ;;
  62                 .tar)
  63                         git-archive --format=tar --prefix="$base" "$id" >"$dest"
  64                         ;;
  65                 .zip)
  66                         git-archive --format=zip --prefix="$base" "$id" >"$dest"
  67                         ;;
  68                 esac
  69                 ;;
  70         *)
  71                 mkdir -p "$dest" || die "cannot create $dest"
  72                 export GIT_INDEX_FILE="$dest/.git-index"
  73                 id="$(cg-object-id -t "$id")"
  74                 git-read-tree "$id"
  75                 git-checkout-index "--prefix=$dest/" -a
  76                 rm "$GIT_INDEX_FILE"
  77         ;;
  78 esac