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#!/bin/bash
# acid-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)).
#
# On a successful run, the new commit hash is printed to stdout (or the previous
# hash, if no update occurred). The caller should cache this hash value upon
# successful deployment.
#
# If a new version of the file tree is checked out, this file exits with code 1,
# otherwise a stale success exits with 0. On any error, the null hash is
# printed, and we exit with 2.
gethash() {
obj=$(git for-each-ref \
--count=1 \
--format='%(objectname)' \
--sort='-creatordate' \
"$1") # pattern
git rev-parse --quiet --verify "$obj^{commit}"
}
fail() {
echo "$NULL_HASH"
exit 2
}
cd "$CYCHE_SERVICE_DIR"
# For <name>, limit to a-z, 0-9, -, _
if ! echo "$1" | grep -Eq '^[-_a-z0-9]*$'; then
echo "Bad service name: $1" >&2
fail
fi
if ! [ -d "$1" ]; then
# New repository
git clone "$2" "$1" >&2 || fail
cd "$1"
# Strip down to tags and remote refs only
git remote set-head origin --delete >/dev/null 2>&1
git checkout HEAD~0 >/dev/null 2>&1
git for-each-ref --format='delete %(refname)' refs/heads \
| git update-ref --stdin >/dev/null 2>&1
# Init cyche metadata
echo "$NULL_HASH" >".git/previous_hash"
touch ".git/previous_slug"
else
# Existing repository
cd "$1"
fi
git remote set-url origin "$2" >&2 # pick up url changes
git fetch --all --prune >&2 || fail
prev=$(cat '.git/previous_hash')
next=$(gethash "$3")
if [ -z "$next" ]; then
echo "No refs match $3" >&2
fail
fi
echo "$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 >&2
echo -n "Checked out " >&2
git log -1 --oneline --no-abbrev-commit --no-decorate >&2
exit 1
fi
exit 0
|
