Chris Toph
e281f8686e
• Fixes parameter error from compression tool command • Implements incremental sleep in periodic backups for faster process exit detection • Increases backup count for emulator configurations from 20 to 30
84 lines
1.9 KiB
Nix
84 lines
1.9 KiB
Nix
{
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pkgs,
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...
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}:
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pkgs.writeScript "backup-wrapper" ''
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#!/usr/bin/env fish
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## Helpers ##
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function backup
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# Uses $src, $dest, $max_backups from outer scope
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set timestamp (date +%Y%m%d-%H%M%S)
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set outfile "$dest/backup-$timestamp.tar.zst"
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mkdir -p $dest
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echo "→ Creating backup: $outfile"
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tar cf - $src |
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${pkgs.zstd}/bin/zstd -c -T5 -15 -v > $outfile
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# Rotate: keep only the newest $max_backups
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set files (ls -1t $dest/backup-*.tar.zst)
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if test (count $files) -gt $max_backups
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for f in $files[(math "$max_backups + 1")..-1]
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rm $f
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echo " • Removed old backup: $f"
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end
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end
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end
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function periodic_backups --argument-names pid
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while true
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# sleep in 1s increments so we can detect process exit early
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for i in (seq 1 $interval)
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if not test -d /proc/$pid
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return
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end
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sleep 1
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end
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# If we're still here, do the interval backup
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echo "Interval backup at "(date)
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backup
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end
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end
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## Arg parsing ##
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if test (count $argv) -lt 5
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echo "Usage: $argv[0] <src> <dest> <interval_s> <max_backups> -- <program> [args...]"
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exit 1
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end
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set src $argv[1]
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set dest $argv[2]
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set interval $argv[3]
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set max_backups $argv[4]
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# strip leading “--” if present
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set rest $argv[5..-1]
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if test $rest[1] = "--"
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set rest $rest[2..-1]
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end
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## Workflow ##
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echo "BACKUP: Initial backup of '$src' → '$dest'"
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backup
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echo "BACKUP: Launching your program: $rest"
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# fish will expand $rest as command + args
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$rest &; set pid $last_pid
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echo " → PID is $pid"
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echo "BACKUP: Starting periodic backups every $interval seconds…"
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periodic_backups $pid &
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echo "BACKUP: Waiting for PID $pid to exit…"
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wait $pid
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echo "BACKUP: Program exited at "(date)"; doing final backup."
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backup
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exit 0
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''
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