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  45                         # We do not distinguish between dependencies out-of-date
  46                         # and base out-of-date cases for $dep here,
  47                         # but thanks to needs_update returning : for the latter,
  48                         # we do correctly recurse here in both cases.
  49
  50                         if [ x"$action" = x+ ]; then
  51                                 info "Recursing to $dep..."
  52                                 git checkout -q "$dep"
  53                                 (
  54                                 export TG_RECURSIVE="[$dep] $TG_RECURSIVE"
  55                                 export PS1="[$dep] $PS1"
  56                                 while ! tg update; do
  57                                         # The merge got stuck! Let the user fix it up.
  58                                         info "You are in a subshell. If you abort the merge,"
  59                                         info "use \`exit 1\` to abort the recursive update altogether."
  60                                         if ! sh -i </dev/tty; then
  61                                                 info "Ok, you aborated the merge. Now, you just need to"
  62                                                 info "switch back to some sane branch using \`git checkout\`."
  63                                                 exit 3
  64                                         fi
  65                                 done
  66                                 )
  67                                 switch_to_base "$name"
  68                         fi
  69
  70                         # This will always be a proper topic branch
  71                         # (not a base or remote), since for deep updates
  72                         # we recurse and immediate dependencies
  73                         # are always proper. (branch_needs_update() is called
  74                         # only on the _dependencies_, not our branch itself!)
  75
  76                         info "Updating base with $dep changes..."
  77                         if ! git merge "$dep"; then
  78                                 if [ -z "$TG_RECURSIVE" ]; then
  79                                         resume='`tg update` again'
  80                                 else # subshell
  81                                         resume='exit'
  82                                 fi
  83                                 info "Please commit merge resolution and call $resume."
  84                                 info "It is also safe to abort this operation using \`git reset --hard\`,"
  85                                 info "but please remember that you are on the base branch now;"
  86                                 info "you will want to switch to some normal branch afterwards."
  87                                 rm "$depcheck"
  88                                 exit 2
  89                         fi
  90                 done
  91
  92         # Home, sweet home...
  93         git checkout -q "$name"
  94 else
  95         info "The base is up-to-date."
  96 fi
  97 rm "$depcheck"
  98
  99
 100 ## Second, update our head with the base
 101
 102 if branch_contains "$name" "refs/top-bases/$name"; then
 103         info "The $name head is up-to-date wrt. the base."
 104         exit 0
 105 fi
 106 info "Updating $name against new base..."
 107 if ! git merge "refs/top-bases/$name"; then
 108         if [ -z "$TG_RECURSIVE" ]; then
 109                 info "Please commit merge resolution. No need to do anything else"
 110                 info "You can abort this operation using \`git reset --hard\` now"
 111                 info "and retry this merge later using \`tg update\`."
 112         else # subshell
 113                 info "Please commit merge resolution and call exit."
 114                 info "You can abort this operation using \`git reset --hard\`."
 115         fi
 116         exit 3
 117 fi