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#!/bin/bash
# cyche-source <name> <url> <ref-pattern>
#
# Check a git source for new updates. A local cache repository is cloned if
# <name> doesn't exist. If updates are found, we attempt to checkout the newest
# version according to <ref-pattern> (see <pattern> from git-for-each-ref(1)).
#
# The new (or current, if no update occurred) object hash is printed to stdout.
# This may be a commit hash. However, if <ref-pattern> matches an annotated tag,
# then the hash names the tag object. The caller should cache this hash value
# upon successful deployment.
#
# If the file tree is updated, this file exits non-zero.
gethash() {
git for-each-ref \
--count=1 \
--format='%(objectname)' \
--sort='-creatordate' \
"$1" # pattern
}
cd '/services'
if ! [ -d "$1" ]; then
git clone "$2" "$1" >&2
touch "$1/.git/previous_hash"
touch "$1/.git/previous_slug"
fi
cd "$1"
git remote set-url origin "$2" >&2 # pick up url changes
git fetch --all --prune >&2
prev=$(cat '.git/previous_hash')
next=$(gethash "$3")
if [ -z "$next" ]; then
# no matching refs
next="$prev"
fi
echo "$next"
if [ "$prev" != "$next" ]; then
# update file tree
git submodule deinit --all --force >/dev/null 2>&1
git reset . >/dev/null 2>&1
git checkout . >/dev/null 2>&1
git clean -xffd >/dev/null 2>&1
git checkout "$next" >/dev/null 2>&1
git submodule update --init --recursive >/dev/null 2>&1
exit 1
fi
exit 0
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