ppg-update-production

   1 #!/bin/bash
   2
   3 PPG_EXEC_PATH=$( dirname $(realpath "${BASH_SOURCE[0]}" ) )
   4 GIT_EXEC_PATH=$(git --exec-path)
   5 GIT_DIR=$(git rev-parse --git-dir)
   6
   7 if [ -z "$GIT_DIR" ]; then
   8         echo >&2 "Not in a git checkout"
   9         exit 1
  10 fi
  11
  12 production_sha1=$(git rev-parse --revs-only refs/heads/production 2>/dev/null)
  13 if [ -z "$production_sha1" ]; then
  14         # no production branch, nothing to do
  15         exit 0
  16 fi
  17
  18 nowepoch=$(date --utc +%s)
  19 for tag in $(git tag -l | grep '^ppg-sched-' | sort -r); do
  20         # Sneaky sed: 's/-/ /3g' replaces the 3rd dash only
  21         datestamp=$(echo "$tag"|sed 's/^ppg-sched-//;s/-/ /3g;s/\./:/g;')
  22         tagepoch=$(date -d "$datestamp" +%s)
  23         if [[ $tagepoch -lt $nowepoch ]]; then
  24                 targettag=$tag
  25         fi
  26 done
  27
  28 if [ -z "$targettag" ]; then
  29         # no relevant tags, nothing to do...'
  30         exit
  31 fi
  32
  33 target_sha1=$(git rev-parse --revs-only ${targettag}^{commit} ) || exit 1
  34
  35 # perhaps origin/production is ahead of scheduled tags,
  36 # if so, it wins...
  37 orig_production_sha1=$(git rev-parse --revs-only refs/heads/origin/master)
  38 if [ -n "$orig_production_sha1" ]; then
  39         if $PPG_EXEC_PATH/ppg-is-ancestor $targettag $orig_production_sha1 ; then
  40                 target_sha1=$orig_production_sha1
  41         fi
  42 fi
  43
  44 if [ "$production_sha1" = "$target_sha1" ]; then
  45         # nothing to do
  46         exit 0
  47 fi
  48
  49
  50 if $PPG_EXEC_PATH/ppg-is-ancestor $targettag $production_sha1 ; then
  51         # nothing to do!
  52         exit 0
  53 fi
  54
  55 if ! $PPG_EXEC_PATH/ppg-is-ancestor $production_sha1 $target_sha1 ; then
  56         echo "ERROR: production branch and $targettag have diverged!"
  57         exit 1
  58 fi
  59
  60 headname=$(git rev-parse --symbolic-full-name --revs-only HEAD)
  61
  62 if [ "$headname" = 'refs/heads/production' ]; then
  63         # sanity checks when on production
  64         if [ $(git diff --name-status HEAD | wc -l) -gt 0 ]; then
  65                 echo >&2 'ERROR: Currently on "production" branch and with dirty state.'
  66                 echo >&2 "       Refusing to update with scheduled changes."
  67                 exit 1
  68         fi
  69 fi
  70
  71 echo "About to update production with scheduled changes:"
  72 git log --oneline refs/heads/production..$target_sha1
  73
  74 # and finally
  75 if [ "$headname" = 'refs/heads/production' ]; then
  76         echo "Updating current production checkout"
  77         git merge --ff-only $target_sha1
  78         exit $?
  79 else
  80         git push . $target_sha1:refs/heads/production
  81         exit $?
  82 fi