tg-update.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
   8
   9 ## Parse options
  10
  11 if [ -n "$1" ]; then
  12         echo "Usage: tg [...] update" >&2
  13         exit 1
  14 fi
  15
  16
  17 name="$(git symbolic-ref HEAD | sed 's#^refs/\(heads\|top-bases\)/##')"
  18 base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
  19         die "not a TopGit-controlled branch"
  20
  21
  22 ## First, take care of our base
  23
  24 depcheck="$(mktemp -t tg-depcheck.XXXXXX)"
  25 missing_deps=
  26 needs_update "$name" >"$depcheck" || :
  27 [ -z "$missing_deps" ] || die "some dependencies are missing: $missing_deps"
  28 if [ -s "$depcheck" ]; then
  29         # We need to switch to the base branch
  30         # ...but only if we aren't there yet (from failed previous merge)
  31         HEAD="$(git symbolic-ref HEAD)"
  32         if [ "$HEAD" = "${HEAD#refs/top-bases/}" ]; then
  33                 switch_to_base "$name"
  34         fi
  35
  36         cat "$depcheck" |
  37                 sed 's/ [^ ]* *$//' | # last is $name
  38                 sed 's/.* \([^ ]*\)$/+\1/' | # only immediate dependencies
  39                 sed 's/^\([^+]\)/-\1/' | # now each line is +branch or -branch (+ == recurse)
  40                 uniq -s 1 | # fold branch lines; + always comes before - and thus wins within uniq
  41                 while read depline; do
  42                         action="$(echo "$depline" | cut -c 1)"
  43                         dep="$(echo "$depline" | cut -c 2-)"
  44
  45                         # We do not distinguish between dependencies out-of-date
  46                         # and base/remote out-of-date cases for $dep here,
  47                         # but thanks to needs_update returning : or %
  48                         # for the latter, we do correctly recurse here
  49                         # in both cases.
  50
  51                         if [ x"$action" = x+ ]; then
  52                                 info "Recursing to $dep..."
  53                                 git checkout -q "$dep"
  54                                 (
  55                                 export TG_RECURSIVE="[$dep] $TG_RECURSIVE"
  56                                 export PS1="[$dep] $PS1"
  57                                 while ! $tg update; do
  58                                         # The merge got stuck! Let the user fix it up.
  59                                         info "You are in a subshell. If you abort the merge,"
  60                                         info "use \`exit 1\` to abort the recursive update altogether."
  61                                         if ! sh -i </dev/tty; then
  62                                                 info "Ok, you aborated the merge. Now, you just need to"
  63                                                 info "switch back to some sane branch using \`git checkout\`."
  64                                                 exit 3
  65                                         fi
  66                                 done
  67                                 )
  68                                 switch_to_base "$name"
  69                         fi
  70
  71                         # This will be either a proper topic branch
  72                         # or a remote base.  (branch_needs_update() is called
  73                         # only on the _dependencies_, not our branch itself!)
  74
  75                         info "Updating base with $dep changes..."
  76                         if ! git merge "$dep"; then
  77                                 if [ -z "$TG_RECURSIVE" ]; then
  78                                         resume='`$tg update` again'
  79                                 else # subshell
  80                                         resume='exit'
  81                                 fi
  82                                 info "Please commit merge resolution and call $resume."
  83                                 info "It is also safe to abort this operation using \`git reset --hard\`,"
  84                                 info "but please remember that you are on the base branch now;"
  85                                 info "you will want to switch to some normal branch afterwards."
  86                                 rm "$depcheck"
  87                                 exit 2
  88                         fi
  89                 done
  90
  91         # Home, sweet home...
  92         git checkout -q "$name"
  93 else
  94         info "The base is up-to-date."
  95 fi
  96 rm "$depcheck"
  97
  98 merge_with="refs/top-bases/$name"
  99
 100
 101 ## Second, update our head with the remote branch
 102
 103 if has_remote "$name"; then
 104         rname="refs/remotes/$base_remote/$name"
 105         if branch_contains "$name" "$rname"; then
 106                 info "The $name head is up-to-date wrt. its remote branch."
 107         else
 108                 info "Reconciling remote branch updates with $name base..."
 109                 # *DETACH* our HEAD now!
 110                 git checkout -q "refs/top-bases/$name"
 111                 if ! git merge "$rname"; then
 112                         info "Oops, you will need to help me out here a bit."
 113                         info "Please commit merge resolution and call:"
 114                         info "git checkout $name && git merge <commitid>"
 115                         info "It is also safe to abort this operation using: git reset --hard $name"
 116                         exit 3
 117                 fi
 118                 # Go back but remember we want to merge with this, not base
 119                 merge_with="$(git rev-parse HEAD)"
 120                 git checkout -q "$name"
 121         fi
 122 fi
 123
 124
 125 ## Third, update our head with the base
 126
 127 if branch_contains "$name" "$merge_with"; then
 128         info "The $name head is up-to-date wrt. the base."
 129         exit 0
 130 fi
 131 info "Updating $name against new base..."
 132 if ! git merge "$merge_with"; then
 133         if [ -z "$TG_RECURSIVE" ]; then
 134                 info "Please commit merge resolution. No need to do anything else"
 135                 info "You can abort this operation using \`git reset --hard\` now"
 136                 info "and retry this merge later using \`$tg update\`."
 137         else # subshell
 138                 info "Please commit merge resolution and call exit."
 139                 info "You can abort this operation using \`git reset --hard\`."
 140         fi
 141         exit 3
 142 fi