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scripts: Make setup-apt-repo a no-op if nothing has changed.

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This performance optimization is important for being able to run this
from puppet in our production environment.
This commit is contained in:
Tim Abbott
2018-12-10 17:35:41 -08:00
parent 05c4855cc9
commit 0d48f47eba
1 changed files with 18 additions and 0 deletions
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18
scripts/lib/setup-apt-repo
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@@ -2,9 +2,25 @@
set -x
set -e
# Ensure the directory for LAST_DEPENDENCIES_HASH exists
mkdir -p /var/lib/zulip
SOURCES_FILE=/etc/apt/sources.list.d/zulip.list
STAMP_FILE=/etc/apt/sources.list.d/zulip.list.apt-update-in-progress
ZULIP_SCRIPTS="$(dirname "$(dirname "$0")")"
DEPENDENCIES_HASH=$(sha1sum "$ZULIP_SCRIPTS/setup/"*.asc "$0")
DEPENDENCIES_HASH_FILE="/var/lib/zulip/setup-repositories-state"
# Ensure that DEPENDENCIES_HASH_FILE exists before hashing it.
touch "$DEPENDENCIES_HASH_FILE"
LAST_DEPENDENCIES_HASH="$(cat "$DEPENDENCIES_HASH_FILE")"
# First, we only do anything in setup-apt-repo if any of its inputs
# (apt keys, code, etc.) changed.
if [ "$DEPENDENCIES_HASH" = "$LAST_DEPENDENCIES_HASH" ]; then
exit 0
fi
# Ensure that the sources file exists
touch "$SOURCES_FILE"
@@ -48,3 +64,5 @@ else
touch "$STAMP_FILE"
apt-get update && rm -f "$STAMP_FILE"
fi
echo "$DEPENDENCIES_HASH" > "$DEPENDENCIES_HASH_FILE"