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tmux-continuum
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Merge pull request #61 from v9v/fix-autosave-race 

Fix race condition in autosave
pull/31/merge
Bruno Sutic 2019-07-13 17:04:13 +02:00 committed by GitHub
parent 100498d0c2 ff63f86678
commit 9f3cbc7e12
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1 changed files with 19 additions and 1 deletions
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20
scripts/continuum_save.sh
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@ -34,8 +34,26 @@ fetch_and_run_tmux_resurrect_save_script() {
fi
}
acquire_lock() {
# Sometimes tmux starts multiple saves in parallel. We want only one
# save to be running, otherwise we can get corrupted saved state.
local lockdir_prefix="/tmp/tmux-continuum-$(current_tmux_server_pid)-lock-"
# The following implements a lock that auto-expires after 100...200s.
local lock_generation=$((`date +%s` / 100))
local lockdir1="${lockdir_prefix}${lock_generation}"
local lockdir2="${lockdir_prefix}$(($lock_generation + 1))"
if mkdir "$lockdir1"; then
trap "rmdir "$lockdir1"" EXIT
if mkdir "$lockdir2"; then
trap "rmdir "$lockdir1" "$lockdir2"" EXIT
return 0
fi
fi
return 1 # Someone else has the lock.
}
main() {
if supported_tmux_version_ok && auto_save_not_disabled && enough_time_since_last_run_passed; then
if supported_tmux_version_ok && auto_save_not_disabled && enough_time_since_last_run_passed && acquire_lock; then
fetch_and_run_tmux_resurrect_save_script
fi
}