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 rname= # Remote branch to base this one on
  11
  12
  13 ## Parse options
  14
  15 while [ -n "$1" ]; do
  16         arg="$1"; shift
  17         case "$arg" in
  18         -r)
  19                 rname="$1"; shift;;
  20         -*)
  21                 echo "Usage: tg [...] create NAME [DEPS...|-r RNAME]" >&2
  22                 exit 1;;
  23         *)
  24                 if [ -z "$name" ]; then
  25                         name="$arg"
  26                 else
  27                         deps="$deps $arg"
  28                 fi;;
  29         esac
  30 done
  31
  32
  33 ## Fast-track creating branches based on remote ones
  34
  35 if [ -n "$rname" ]; then
  36         [ -n "$name" ] || die "no branch name given"
  37         ! ref_exists "$name" || die "branch '$name' already exists"
  38         has_remote "$rname" || die "no branch $rname in remote $base_remote"
  39
  40         git update-ref "refs/top-bases/$name" "refs/remotes/$base_remote/top-bases/$rname"
  41         git update-ref "refs/heads/$name" "refs/remotes/$base_remote/$rname"
  42         info "Topic branch $name based on $base_remote : $rname set up."
  43         exit 0
  44 fi
  45
  46
  47 ## Auto-guess dependencies
  48
  49 deps="${deps# }"
  50 if [ -z "$deps" ]; then
  51         if [ -z "$name" -a -s "$git_dir/top-name" -a -s "$git_dir/top-deps" -a -s "$git_dir/top-merge" ]; then
  52                 # We are setting up the base branch now; resume merge!
  53                 name="$(cat "$git_dir/top-name")"
  54                 deps="$(cat "$git_dir/top-deps")"
  55                 merge="$(cat "$git_dir/top-merge")"
  56                 restarted=1
  57                 info "Resuming $name setup..."
  58         else
  59                 # The common case
  60                 [ -z "$name" ] && die "no branch name given"
  61                 head="$(git symbolic-ref HEAD)"
  62                 deps="${head#refs/heads/}"
  63                 [ "$deps" != "$head" ] || die "refusing to auto-depend on non-head ref ($head)"
  64                 info "Automatically marking dependency on $deps"
  65         fi
  66 fi
  67
  68 [ -n "$merge" -o -n "$restarted" ] || merge="$deps "
  69
  70 for d in $deps; do
  71         ref_exists "$d"  ||
  72                 die "unknown branch dependency '$d'"
  73 done
  74 ! ref_exists "$name"  ||
  75         die "branch '$name' already exists"
  76
  77 # Clean up any stale stuff
  78 rm -f "$git_dir/top-name" "$git_dir/top-deps" "$git_dir/top-merge"
  79
  80
  81 ## Create base
  82
  83 if [ -n "$merge" ]; then
  84         # Unshift the first item from the to-merge list
  85         branch="${merge%% *}"
  86         merge="${merge#* }"
  87         info "Creating $name base from $branch..."
  88         # We create a detached head so that we can abort this operation
  89         git checkout -q "$(git rev-parse "$branch")"
  90 fi
  91
  92
  93 ## Merge other dependencies into the base
  94
  95 while [ -n "$merge" ]; do
  96         # Unshift the first item from the to-merge list
  97         branch="${merge%% *}"
  98         merge="${merge#* }"
  99         info "Merging $name base with $branch..."
 100
 101         if ! git merge "$branch"; then
 102                 info "Please commit merge resolution and call: $tg create"
 103                 info "It is also safe to abort this operation using:"
 104                 info "git reset --hard some_branch"
 105                 info "(You are on a detached HEAD now.)"
 106                 echo "$name" >"$git_dir/top-name"
 107                 echo "$deps" >"$git_dir/top-deps"
 108                 echo "$merge" >"$git_dir/top-merge"
 109                 exit 2
 110         fi
 111 done
 112
 113
 114 ## Set up the topic branch
 115
 116 git update-ref "refs/top-bases/$name" "HEAD" ""
 117 git checkout -b "$name"
 118
 119 echo "$deps" | sed 's/ /\n/g' >"$root_dir/.topdeps"
 120 git add -f "$root_dir/.topdeps"
 121
 122 author="$(git var GIT_AUTHOR_IDENT)"
 123 author_addr="${author%> *}>"
 124 {
 125         echo "From: $author_addr"
 126         ! header="$(git config topgit.to)" || echo "To: $header"
 127         ! header="$(git config topgit.cc)" || echo "Cc: $header"
 128         ! header="$(git config topgit.bcc)" || echo "Bcc: $header"
 129         ! subject_prefix="$(git config topgit.subjectprefix)" || subject_prefix="$subject_prefix "
 130         echo "Subject: [${subject_prefix}PATCH] $name"
 131         echo
 132         cat <<EOT
 133 <patch description>
 134
 135 Signed-off-by: $author_addr
 136 EOT
 137 } >"$root_dir/.topmsg"
 138 git add -f "$root_dir/.topmsg"
 139
 140
 141
 142 info "Topic branch $name set up. Please fill .topmsg now and make initial commit."
 143 info "To abort: git rm -f .top* && git checkout ${deps%% *} && $tg delete $name"