tg-export.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # (c) Petr Baudis <pasky@suse.cz>  2008
   4 # GPLv2
   5
   6 name=
   7 branches=
   8 output=
   9 driver=collapse
  10 flatten=false
  11 numbered=false
  12
  13
  14 ## Parse options
  15
  16 while [ -n "$1" ]; do
  17         arg="$1"; shift
  18         case "$arg" in
  19         -b)
  20                 branches="$1"; shift;;
  21         --flatten)
  22                 flatten=true;;
  23         --numbered)
  24                 flatten=true;
  25                 numbered=true;;
  26         --quilt)
  27                 driver=quilt;;
  28         --collapse)
  29                 driver=collapse;;
  30         -*)
  31                 echo "Usage: tg [...] export ([--collapse] NEWBRANCH | [-b BRANCH1,BRANCH2...] --quilt DIRECTORY)" >&2
  32                 exit 1;;
  33         *)
  34                 [ -z "$output" ] || die "output already specified ($output)"
  35                 output="$arg";;
  36         esac
  37 done
  38
  39
  40
  41 [ -z "$branches" -o "$driver" = "quilt" ] ||
  42         die "-b works only with the quilt driver"
  43
  44 [ "$driver" = "quilt" ] || ! "$numbered" ||
  45         die "--numbered works only with the quilt driver";
  46
  47 [ "$driver" = "quilt" ] || ! "$flatten" ||
  48         die "--flatten works only with the quilt driver"
  49
  50 if [ -z "$branches" ]; then
  51         # this check is only needed when no branches have been passed
  52         name="$(git symbolic-ref HEAD | sed 's#^refs/heads/##')"
  53         base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
  54                 die "not on a TopGit-controlled branch"
  55 fi
  56
  57
  58 playground="$(mktemp -d -t tg-export.XXXXXX)"
  59 trap 'rm -rf "$playground"' EXIT
  60
  61
  62 ## Collapse driver
  63
  64 # pretty_tree NAME
  65 # Output tree ID of a cleaned-up tree without tg's artifacts.
  66 pretty_tree()
  67 {
  68         (export GIT_INDEX_FILE="$playground/^index"
  69          git read-tree "$1"
  70          git update-index --force-remove ".topmsg" ".topdeps"
  71          git write-tree)
  72 }
  73
  74 # collapsed_commit NAME
  75 # Produce a collapsed commit of branch NAME.
  76 collapsed_commit()
  77 {
  78         name="$1"
  79
  80         rm -f "$playground/^pre" "$playground/^post"
  81         >"$playground/^body"
  82
  83         # Get commit message and authorship information
  84         git cat-file blob "$name:.topmsg" | git mailinfo "$playground/^msg" /dev/null > "$playground/^info"
  85
  86         GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' "$playground/^info")"
  87         GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' "$playground/^info")"
  88         GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' "$playground/^info")"
  89         SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' "$playground/^info")"
  90
  91         test -n "$GIT_AUTHOR_NAME" && export GIT_AUTHOR_NAME
  92         test -n "$GIT_AUTHOR_EMAIL" && export GIT_AUTHOR_EMAIL
  93         test -n "$GIT_AUTHOR_DATE" && export GIT_AUTHOR_DATE
  94
  95         # Determine parent
  96         parent="$(cut -f 1 "$playground/$name^parents")"
  97         if [ "$(cat "$playground/$name^parents" | wc -l)" -gt 1 ]; then
  98                 # Produce a merge commit first
  99                 parent="$({
 100                         echo "TopGit-driven merge of branches:"
 101                         echo
 102                         cut -f 2 "$playground/$name^parents"
 103                 } | git commit-tree "$(pretty_tree "refs/top-bases/$name")" \
 104                         $(for p in $parent; do echo -p $p; done))"
 105         fi
 106
 107         if branch_empty "$name"; then
 108                 echo "$parent";
 109         else
 110                 (printf '%s\n\n' "$SUBJECT"; cat "$playground/^msg") |
 111                 git stripspace |
 112                 git commit-tree "$(pretty_tree "$name")" -p "$parent"
 113         fi;
 114
 115         echo "$name" >>"$playground/^ticker"
 116 }
 117
 118 # collapse
 119 # This will collapse a single branch, using information about
 120 # previously collapsed branches stored in $playground.
 121 collapse()
 122 {
 123         if [ -s "$playground/$_dep" ]; then
 124                 # We've already seen this dep
 125                 commit="$(cat "$playground/$_dep")"
 126
 127         elif [ -z "$_dep_is_tgish" ]; then
 128                 # This dep is not for rewrite
 129                 commit="$(git rev-parse --verify "$_dep")"
 130
 131         else
 132                 # First time hitting this dep; the common case
 133                 echo "Collapsing $_dep"
 134                 commit="$(collapsed_commit "$_dep")"
 135                 mkdir -p "$playground/$(dirname "$_dep")"
 136                 echo "$commit" >"$playground/$_dep"
 137         fi
 138
 139         # Propagate our work through the dependency chain
 140         mkdir -p "$playground/$(dirname "$_name")"
 141         echo "$commit   $_dep" >>"$playground/$_name^parents"
 142 }
 143
 144
 145 ## Quilt driver
 146
 147 quilt()
 148 {
 149         if [ -z "$_dep_is_tgish" ]; then
 150                 # This dep is not for rewrite
 151                 return
 152         fi
 153
 154         if "$flatten"; then
 155                 bn="$(echo "$_dep.diff" | sed -e 's#_#__#g' -e 's#/#_#g')";
 156                 dn="";
 157         else
 158                 bn="$(basename "$_dep.diff")";
 159                 dn="$(dirname "$_dep.diff")/";
 160                 if [ "x$dn" = "x./" ]; then
 161                         dn="";
 162                 fi;
 163         fi;
 164
 165         if [ -e "$playground/$_dep" ]; then
 166                 # We've already seen this dep
 167                 return
 168         fi
 169
 170         mkdir -p "$playground/$(dirname "$_dep")";
 171         touch "$playground/$_dep";
 172
 173         if branch_empty "$_dep"; then
 174                 echo "Skip empty patch $_dep";
 175         else
 176                 if "$numbered"; then
 177                         number="$(printf "%04u" $(($(cat "$playground/^number" 2>/dev/null) + 1)))";
 178                         bn="$number-$bn";
 179                         echo "$number" >"$playground/^number";
 180                 fi;
 181
 182                 echo "Exporting $_dep"
 183                 mkdir -p "$output/$dn";
 184                 $tg patch "$_dep" >"$output/$dn$bn"
 185                 echo "$dn$bn -p1" >>"$output/series"
 186         fi
 187 }
 188
 189
 190 ## Machinery
 191
 192 if [ "$driver" = "collapse" ]; then
 193         [ -n "$output" ] ||
 194                 die "no target branch specified"
 195         ! ref_exists "$output"  ||
 196                 die "target branch '$output' already exists; first run: git branch -D $output"
 197
 198 elif [ "$driver" = "quilt" ]; then
 199         [ -n "$output" ] ||
 200                 die "no target directory specified"
 201         [ ! -e "$output" ] ||
 202                 die "target directory already exists: $output"
 203
 204         mkdir -p "$output"
 205 fi
 206
 207
 208 driver()
 209 {
 210         case $_dep in refs/remotes/*) return;; esac
 211         branch_needs_update >/dev/null
 212         [ "$_ret" -eq 0 ] ||
 213                 die "cancelling export of $_dep (-> $_name): branch not up-to-date"
 214
 215         $driver
 216 }
 217
 218 # Call driver on all the branches - this will happen
 219 # in topological order.
 220 if [ -z "$branches" ]; then
 221         recurse_deps driver "$name"
 222         (_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; driver)
 223 else
 224         echo "$branches" | tr ',' '\n' | while read _dep; do
 225                 _dep_is_tgish=1
 226                 $driver
 227         done
 228         name="$(echo "$branches" | sed 's/.*,//')"
 229 fi
 230
 231
 232 if [ "$driver" = "collapse" ]; then
 233         git update-ref "refs/heads/$output" "$(cat "$playground/$name")" ""
 234
 235         depcount="$(cat "$playground/^ticker" | wc -l)"
 236         echo "Exported topic branch $name (total $depcount topics) to branch $output"
 237
 238 elif [ "$driver" = "quilt" ]; then
 239         depcount="$(cat "$output/series" | wc -l)"
 240         echo "Exported topic branch $name (total $depcount topics) to directory $output"
 241 fi
 242
 243 # vim:noet