ppg-schedule

 #!/bin/bash

if [[ -n "${PPG_DEBUG}" ]]; then
	set -x
fi

PPG_EXEC_PATH=$( dirname $(readlink -f "${BASH_SOURCE[0]}" ) )
GIT_EXEC_PATH=$(git --exec-path)
GIT_DIR=$(git rev-parse --git-dir)

if [ -z "$GIT_DIR" ]; then
	echo >&2 "Not in a git checkout"
	exit 1
fi

datestr=$1

# sanity-check we are on master
headname=$(git rev-parse --symbolic-full-name --revs-only HEAD)
if [ "$headname" != "refs/heads/master" ]; then
	echo >&2 "ERROR: can only schedule from the master branch!"
	exit 1
fi

# sanity check whether is already scheduled
if (git tag --points-at HEAD && git tag --points-at HEAD) \
	|grep -qc '^ppg-sched-' ; then
	echo ERROR: This commit is already scheduled with these tags:
    echo 
	(git tag --points-at HEAD && git tag --points-at HEAD) | sort -u
    echo
	exit 1
fi

# use /usr/bin/date to interpret the date. it is
# suprisingly powerful
epoch=$(/usr/bin/date -d "$datestr" +%s) || exit 1
now=$(/usr/bin/date +%s)
if [[ $epoch -lt $now ]]; then
	echo >&2 $(/usr/bin/date -d "@${epoch}") "is in the past"
    exit 1
fi
###
### TODO: FIXME: do not asume we are only deploying one commit!
###              should check production branch _and_ tags
###              to spot the log between the latest priorly
###              scheduled commit
###
echo 
echo Scheduling to deploy commit
echo
git log --oneline --stat -n1
echo
echo On the following time/date:
echo
echo -n "     "
/usr/bin/date -d "@${epoch}"
echo -n "     "
/usr/bin/date --utc -d "@${epoch}"
echo 
echo -n "is this correct? [Ny] "
read correct
if [[ "${correct:0:1}" != 'Y' ]] && [[ "${correct:0:1}" != 'y' ]]; then
     echo Cancelling schedule. You can check your datatestamp with
     echo /usr/bin/date -d "your datestamp"
     exit 1
fi

# sed: 
# - trim the tz (everything after the +)
# - replace spaces with '-', ':'' with '.''
tagdatestamp=$(date --rfc-3339=seconds --utc\
	|sed 's/+.*//;s/ /-/g;s/:/./g;')

###
### FIXME - Add support for tag messages and scheduling something other
###         than HEAD while still providing useful sanity checks...
###

# validate is not earlier than any existing timestamps
if ! ( (git tag -l|grep 'ppg-sched'|sort&&echo "ppg-sched-$tagdatestamp")\
	|sort --check=quiet ) ; then
	last_tag=$(git tag -l | grep 'ppg-sched' | sort | tail -n1)
	echo "Error: your change cannot be scheduled earlier than $last_tag."
fi
git tag "ppg-sched-$tagdatestamp" HEAD || exit 1

echo 
echo 'Checking for scheduled updates to the production branch...'
$PPG_EXEC_PATH/ppg-update-production
echo
echo 'Applied "ppg-sched-$tagdatestamp" tag successfully - you must now use'
echo
echo '    git push --tags'
echo 
echo 'to ensure the scheduled changes are published on the gold server.'