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58 lines
2.0 KiB
Bash
58 lines
2.0 KiB
Bash
#!/bin/sh
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# https://github.com/nakamochi/sysupdates
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# pull changes from a remote git repo and run the "apply" script.
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# commits are expected to be signed by gpg keys with a sufficient
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# trust level to satisfy git pull --verify-signatures.
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# the script is expected to be run as root, to allow making changes to the
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# operating system.
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# in the future, the plan is to provide an on-screen git diff and apply updates
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# after user confirmation.
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# git branch to pull from. defaults to master.
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# another value is "dev", for a development aka unstable version.
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BRANCH="${1:-master}"
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# output everything to a temp file and print its contents only in case of an error,
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# so that when run via a cronjob, the output is empty on success which prevents
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# needless emails, were any configured.
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LOGFILE="${LOGFILE:-/var/log/sysupdate.log}"
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# a local git repo dir where to pull the updates into.
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REPODIR="${REPODIR:-/ssd/sysupdates}"
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# multiple running instances of the script would certainly result in race conditions.
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# so, we serialize runs using a lock file, timing out with an error after 15min.
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if [ -z "$NAKAMOCHI_SYSUPDATE_LOCK" ]; then
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# use the script itself as the lock file
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lockfile=$0
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exec env NAKAMOCHI_SYSUPDATE_LOCK=1 \
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flock --exclusive --timeout 900 "$lockfile" "$0" "$@"
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fi
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# start of the sysupdate; trim prevously logged runs
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date > $LOGFILE
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# fetch updates from remote
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cd "$REPODIR"
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{
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git remote set-url origin https://github.com/nakamochi/sysupdates.git
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git fetch origin # in case the refspec is unknown locally yet
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git reset --hard HEAD # remove local changes
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git clean -fd # force-delete untracked files
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git checkout "$BRANCH"
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git pull --verify-signatures
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} >> $LOGFILE 2>&1
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if [ $? -ne 0 ]; then
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echo "ERROR: git pull failed"
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cat $LOGFILE
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exit 1
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fi
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# run repo's update script
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export SYSUPDATES_ROOTDIR="$REPODIR"
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export SYSUPDATES_CHANNEL="$BRANCH"
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./apply.sh >> $LOGFILE 2>&1
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if [ $? -ne 0 ]; then
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echo "ERROR: apply failed"
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cat $LOGFILE
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exit 1
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fi
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