tg-create.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # (c) Petr Baudis <pasky@suse.cz>  2008
   4 # GPLv2
   5
   6 deps= # List of dependent branches
   7 restarted= # Set to 1 if we are picking up in the middle of base setup
   8 merge= # List of branches to be merged; subset of $deps
   9 name=
  10
  11
  12 ## Parse options
  13
  14 while [ -n "$1" ]; do
  15         arg="$1"; shift
  16         case "$arg" in
  17         -d)
  18                 deps="$(echo "$1" | sed 's/,/ /g')"; shift;;
  19         -*)
  20                 echo "Usage: tg create [-d DEPS...] NAME" >&2
  21                 exit 1;;
  22         *)
  23                 [ -z "$name" ] || die "name already specified ($name)"
  24                 name="$arg";;
  25         esac
  26 done
  27
  28
  29 ## Auto-guess dependencies
  30
  31 if [ -z "$deps" ]; then
  32         head="$(git symbolic-ref HEAD)"
  33         bname="${head#refs/top-bases/}"
  34         if [ "$bname" != "$head" -a -s "$git_dir/top-deps" -a -s "$git_dir/top-merge" ]; then
  35                 # We are on a base branch now; resume merge!
  36                 deps="$(cat "$git_dir/top-deps")"
  37                 merge="$(cat "$git_dir/top-merge")"
  38                 name="$bname"
  39                 restarted=1
  40                 info "Resuming $name setup..."
  41         else
  42                 # The common case
  43                 [ -z "$name" ] && die "no branch name given"
  44                 deps="${head#refs/heads/}"
  45                 [ "$deps" != "$head" ] || die "refusing to auto-depend on non-head ref ($head)"
  46                 info "Automatically marking dependency on $deps"
  47         fi
  48 fi
  49
  50 [ -n "$merge" -o -n "$restarted" ] || merge="$deps "
  51
  52 for d in $deps; do
  53         git rev-parse --verify "$d" >/dev/null 2>&1 ||
  54                 die "unknown branch dependency '$d'"
  55 done
  56 ! git rev-parse --verify "$name" >/dev/null 2>&1 ||
  57         die "branch '$name' already exists"
  58
  59 # Clean up any stale stuff
  60 rm -f "$git_dir/top-deps" "$git_dir/top-merge"
  61
  62
  63 ## Create base
  64
  65 if [ -n "$merge" ]; then
  66         # Unshift the first item from the to-merge list
  67         branch="${merge%% *}"
  68         merge="${merge#* }"
  69         info "Creating $name base from $branch..."
  70         switch_to_base "$name" "$branch"
  71 fi
  72
  73
  74 ## Merge other dependencies into the base
  75
  76 while [ -n "$merge" ]; do
  77         # Unshift the first item from the to-merge list
  78         branch="${merge%% *}"
  79         merge="${merge#* }"
  80         info "Merging $name base with $branch..."
  81
  82         if ! git merge "$branch"; then
  83                 info "Please commit merge resolution and call: tg create"
  84                 info "It is also safe to abort this operation using \`git reset --hard\`"
  85                 info "but please remember you are on the base branch now;"
  86                 info "you will want to switch to a different branch."
  87                 echo "$deps" >"$git_dir/top-deps"
  88                 echo "$merge" >"$git_dir/top-merge"
  89                 exit 2
  90         fi
  91 done
  92
  93
  94 ## Set up the topic branch
  95
  96 git checkout -b "$name"
  97
  98 echo "$deps" | sed 's/ /\n/g' >"$root_dir/.topdeps"
  99 git add "$root_dir/.topdeps"
 100
 101 author="$(git var GIT_AUTHOR_IDENT)"
 102 author_addr="${author%> *}>"
 103 {
 104         echo "From: $author_addr"
 105         echo "Subject: [PATCH] $1"
 106         echo
 107         cat <<EOT
 108 <patch description>
 109
 110 Signed-off-by: $author_addr
 111 EOT
 112 } >"$root_dir/.topmsg"
 113 git add "$root_dir/.topmsg"
 114
 115
 116
 117 info "Topic branch $name set up. Please fill .topmsg now and make initial commit."
 118 info "To abort: git rm -f .top* && git checkout ${deps%% *} && tg delete $name"