ppg-update-production

   1 #!/bin/bash
   2
   3 if [[ -n "${PPG_DEBUG}" ]]; then
   4         set -x
   5 fi
   6
   7 PPG_EXEC_PATH=$( dirname $(readlink -f "${BASH_SOURCE[0]}" ) )
   8 GIT_EXEC_PATH=$(git --exec-path)
   9 GIT_DIR=$(git rev-parse --git-dir)
  10
  11 if [ -z "$GIT_DIR" ]; then
  12         echo >&2 "Not in a git checkout"
  13         exit 1
  14 fi
  15
  16 production_sha1=$(git rev-parse --revs-only refs/heads/production 2>/dev/null)
  17 if [ -z "$production_sha1" ]; then
  18         # no production branch, nothing to do
  19         exit 0
  20 fi
  21
  22 orig_production_sha1=$(git rev-parse --revs-only origin/production)
  23 # default target
  24 target_sha1=$orig_production_sha1
  25
  26 nowepoch=$(date --utc +%s)
  27 for tag in $(git tag -l | grep '^ppg-sched-' | sort -r); do
  28         # Sneaky sed: 's/-/ /3g' replaces the 3rd dash only
  29         datestamp=$(echo "$tag"|sed 's/^ppg-sched-//;s/-/ /3g;s/\./:/g;')
  30         tagepoch=$(date -d "$datestamp" +%s)
  31         if [[ $tagepoch -lt $nowepoch ]]; then
  32                 targettag=$tag
  33         fi
  34 done
  35
  36 if [ -n "$targettag" ]; then
  37         target_sha1=$(git rev-parse --revs-only ${targettag}^{commit} ) || exit 1
  38
  39         # perhaps origin/production is ahead of scheduled tags,
  40         # if so, it wins...
  41
  42         if [ -n "$orig_production_sha1" ]; then
  43                 if $PPG_EXEC_PATH/ppg-is-ancestor $targettag $orig_production_sha1 ; then
  44                         target_sha1=$orig_production_sha1
  45                 fi
  46         fi
  47 fi
  48
  49 if [ "$production_sha1" = "$target_sha1" ]; then
  50         # nothing to do
  51         exit 0
  52 fi
  53
  54 if ! $PPG_EXEC_PATH/ppg-is-ancestor $production_sha1 $target_sha1 ; then
  55         echo "ERROR: production branch and $targettag have diverged!"
  56         exit 1
  57 fi
  58
  59 headname=$(git rev-parse --symbolic-full-name --revs-only HEAD)
  60
  61 if [ "$headname" = 'refs/heads/production' ]; then
  62         # sanity checks when on production
  63         if [ $(git diff --name-status HEAD | wc -l) -gt 0 ]; then
  64                 echo >&2 'ERROR: Currently on "production" branch and with dirty state.'
  65                 echo >&2 "       Refusing to update with scheduled changes."
  66                 exit 1
  67         fi
  68 fi
  69
  70 echo "About to update production with scheduled changes:"
  71 git --no-pager log --oneline -n 100 refs/heads/production..$target_sha1
  72
  73 # and finally
  74 if [ "$headname" = 'refs/heads/production' ]; then
  75         echo "Updating current production checkout"
  76         git merge --ff-only $target_sha1
  77         exit $?
  78 else
  79         git push . $target_sha1:refs/heads/production
  80         exit $?
  81 fi