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| * If you are a normal user, you can run on either the <code>home-manager</code> or <code>channels</code> profiles too. | | * If you are a normal user, you can run on either the <code>home-manager</code> or <code>channels</code> profiles too. |
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| === Example script output === | | == Script (trim-generations.sh) == |
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| ==== Without parameters (defaults) ==== | | The script is available here: [https://gist.github.com/MaxwellDupre/3077cd229490cf93ecab08ef2a79c852 Github Gist - NixOS: trim-generations.sh] |
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| | == Example script output == |
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| | === Without parameters (defaults) === |
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| <syntaxHighlight lang=bash> | | <syntaxHighlight lang=bash> |
| ❯ ./trim-generations.sh | | ❯ ./trim-generations.sh |
| Keeping default: 10 generations OR 7 days, whichever is more
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| Operating on profile: /nix/var/nix/profiles/per-user/user/profile
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| oldest generation: 27 | | The current defaults are: |
| oldest generation created: 2021-09-24 | | Keep-Gens=30 Keep-Days=30 |
| minutes before now: 3918 | | |
| hours before now: 65 | | Keep these defaults? (y/n):y |
| days before now: 2 | | Using defaults.. |
| | Keeping default: 30 generations OR 30 days, whichever is more |
| | Operating on profile: /nix/var/nix/profiles/per-user/dougal/profile |
| | |
| | oldest generation: 75 |
| | oldest generation created: 2023-08-05 |
| | minutes before now: 46740 |
| | hours before now: 779 |
| | days before now: 32 |
| | |
| | current generation: 217 |
| | current generation created: 2023-09-06 |
| | minutes before now: 660 |
| | hours before now: 11 |
| | days before now: 0 |
| | |
| | Something to do... |
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| current generation: 33
| | Found the following generation(s) to delete: |
| current generation created: 2021-09-25
| | generation 75 2023-08-05, 32 day(s) old |
| | generation 76 2023-08-05, 32 day(s) old |
| | generation 77 2023-08-05, 32 day(s) old |
| | generation 78 2023-08-05, 32 day(s) old |
| | generation 79 2023-08-05, 32 day(s) old |
| | generation 80 2023-08-05, 32 day(s) old |
| | generation 81 2023-08-05, 32 day(s) old |
| | generation 82 2023-08-05, 32 day(s) old |
| | generation 83 2023-08-05, 32 day(s) old |
| | generation 84 2023-08-05, 32 day(s) old |
| | generation 85 2023-08-05, 32 day(s) old |
| | generation 86 2023-08-05, 32 day(s) old |
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| All generations are no more than 7 days older than current generation.
| | Do you want to delete these? [Y/n]: |
| Oldest gen difference from current gen: 1
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| Nothing to do!
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| </syntaxHighlight> | | </syntaxHighlight> |
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| ==== With parameters ====
| | === With parameters === |
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| <syntaxHighlight lang=bash> | | <syntaxHighlight lang=bash> |
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| </syntaxHighlight> | | </syntaxHighlight> |
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| ==== With parameters (not enough though) ====
| | === With parameters (not enough though) === |
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| Example if you accidentally don't specify all parameters / arguments. | | Example if you accidentally don't specify all parameters / arguments. |
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| Usage: | | Usage: |
| trim-generations.sh (defaults are: Keep-Gens=10 Keep-Days=7 Profile=user)
| | ./trim-generations.sh <keep-gernerations> <keep-days> <profile> |
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| If you enter any parameters, you must enter all three.
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| | (defaults are: Keep-Gens=30 Keep-Days=30 Profile=user) |
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| | If you enter any parameters, you must enter all three, or none to use defaults. |
| Example: | | Example: |
| trim-generations.sh 15 10 home-manager
| | trim-generations.sh 15 10 home-manager |
| ... this will work on the home-manager profile and keep all generations from the last 10 days, and keep at least 15 generations no matter how old.
| | this will work on the home-manager profile and keep all generations from the |
| | last 10 days, and keep at least 15 generations no matter how old. |
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| Profile choices available: user, home-manager, channels, system (root only)
| | Profiles available are: user, home-manager, channels, system (root) |
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| | -h or --help prints this help text. |
| </syntaxHighlight> | | </syntaxHighlight> |
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| ==== Run as root (default) ====
| | === Run as root (default) === |
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| <syntaxHighlight lang=bash> | | <syntaxHighlight lang=bash> |
| ❯ sudo ./trim-generations.sh | | ❯ sudo ./trim-generations.sh |
| Keeping default: 10 generations OR 7 days, whichever is more
| | The current defaults are: |
| Operating on profile: /nix/var/nix/profiles/default
| | Keep-Gens=30 Keep-Days=30 |
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| oldest generation: 8
| | Keep these defaults? (y/n):y |
| oldest generation created: 2021-09-04
| | Using defaults.. |
| minutes before now: 32725
| | Keeping default: 30 generations OR 30 days, whichever is more |
| hours before now: 545
| | Operating on profile: /nix/var/nix/profiles/system |
| days before now: 22
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| current generation: 8
| | oldest generation: 65 |
| current generation created: 2021-09-04
| | oldest generation created: 2023-08-05 |
| | minutes before now: 46727 |
| | hours before now: 778 |
| | days before now: 32 |
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| All generations are no more than 7 days older than current generation. | | current generation: 102 |
| Oldest gen days difference from current gen: 0 | | current generation created: 2023-09-04 |
| | minutes before now: 3527 |
| | hours before now: 58 |
| | days before now: 2 |
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| | All generations are no more than 30 days older than current generation. |
| | Oldest gen days difference from current gen: 30 |
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| Nothing to do!
| | Nothing to do! |
| </syntaxHighlight> | | </syntaxHighlight> |
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| ==== Run as root (on system profile) ====
| | === Run as root (on system profile) === |
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| <syntaxHighlight lang=bash> | | <syntaxHighlight lang=bash> |
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| </syntaxHighlight> | | </syntaxHighlight> |
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| ==== Run as root (wrong profile) ====
| | === Run as root (wrong profile) === |
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| Example if you accidentally give wrong profile (no home-manager on root): | | Example if you accidentally give wrong profile (no home-manager on root): |
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| Usage: | | Usage: |
| trim-generations.sh (defaults are: Keep-Gens=3 Keep-Days=0 Profile=user)
| | ./trim-generations.sh <keep-gernerations> <keep-days> <profile> |
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| If you enter any parameters, you must enter all three.
| | (defaults are: Keep-Gens=30 Keep-Days=30 Profile=user) |
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| | If you enter any parameters, you must enter all three, or none to use defaults. |
| Example: | | Example: |
| trim-generations.sh 15 10 home-manager
| | trim-generations.sh 15 10 home-manager |
| ... this will work on the home-manager profile and keep all generations from the last 10 days, and keep at least 15 generations no matter how old.
| | this will work on the home-manager profile and keep all generations from the |
| | last 10 days, and keep at least 15 generations no matter how old. |
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| Profile choices available: user, home-manager, channels, system (root only)
| | Profiles available are: user, home-manager, channels, system (root) |
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| | -h or --help prints this help text. |
| </syntaxHighlight> | | </syntaxHighlight> |
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| | | [[Category:Tutorial]] |
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| == Script (trim-generations.sh) ==
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| {{file|trim-generations.sh|bash|<nowiki>
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| #!/usr/bin/env bash
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| set -euo pipefail
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| ## Defaults
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| keepGens=10; keepDays=7
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| ## Usage
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| usage () {
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| printf "Usage:\n\t trim-generations.sh (defaults are: Keep-Gens=$keepGens Keep-Days=$keepDays Profile=user)\n\n"
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| printf "If you enter any parameters, you must enter all three.\n\n"
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| printf "Example:\n\t trim-generations.sh 15 10 home-manager\n"
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| printf "... this will work on the home-manager profile and keep all generations from the last 10 days, and keep at least 15 generations no matter how old.\n"
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| printf "\nProfile choices available: \t user, home-manager, channels, system (root only)\n"
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| }
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| | |
| ## Handle parameters (and change if root)
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| if [[ $EUID -ne 0 ]]; then
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| profile=$(readlink /home/$USER/.nix-profile)
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| else
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| profile="/nix/var/nix/profiles/default"
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| fi
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| if (( $# < 1 )); then
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| printf "Keeping default: 10 generations OR 7 days, whichever is more\n"
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| elif [[ $# -le 2 ]]; then
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| printf "\nError: Not enough arguments.\n\n" >&2
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| usage
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| exit 1
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| elif (( $# > 4)); then
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| printf "\nError: Too many arguments.\n\n" >&2
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| usage
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| exit 2
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| else
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| keepGens=$1; keepDays=$2;
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| (( keepGens < 1 )) && keepGens=1
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| (( keepDays < 0 )) && keepDays=0
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| if [[ $EUID -ne 0 ]]; then
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| if [[ $3 == "user" ]] || [[ $3 == "default" ]]; then
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| profile=$(readlink /home/$USER/.nix-profile)
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| elif [[ $3 == "home-manager" ]]; then
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| profile="/nix/var/nix/profiles/per-user/$USER/home-manager"
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| elif [[ $3 == "channels" ]]; then
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| profile="/nix/var/nix/profiles/per-user/$USER/channels"
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| else
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| printf "\nError: Do not understand your third argument. Should be one of: (user / home-manager/ channels)\n\n"
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| usage
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| exit 3
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| fi
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| else
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| if [[ $3 == "system" ]]; then
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| profile="/nix/var/nix/profiles/system"
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| elif [[ $3 == "user" ]] || [[ $3 == "default" ]]; then
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| profile="/nix/var/nix/profiles/default"
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| else
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| printf "\nError: Do not understand your third argument. Should be one of: (user / system)\n\n"
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| usage
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| exit 3
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| fi
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| fi
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| printf "OK! \t Keep Gens = $keepGens \t Keep Days = $keepDays\n\n"
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| fi
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| printf "Operating on profile: \t $profile\n\n"
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| ## Runs at the end, to decide whether to delete profiles that match chosen parameters.
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| choose () {
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| local default="$1"
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| local prompt="$2"
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| local answer
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| read -p "$prompt" answer
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| [ -z "$answer" ] && answer="$default"
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| case "$answer" in
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| [yY1] ) #printf "answered yes!\n"
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| nix-env --delete-generations ${!gens[@]}
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| exit 0
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| ;;
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| [nN0] ) printf "answered no! exiting\n"
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| exit 6;
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| ;;
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| * ) printf "%b" "Unexpected answer '$answer'!" >&2
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| exit 7;
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| ;;
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| esac
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| } # end of function choose
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| ## Query nix-env for generations list
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| IFS=$'\n' nixGens=( $(nix-env --list-generations -p $profile | sed 's:^\s*::; s:\s*$::' | tr '\t' ' ' | tr -s ' ') )
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| timeNow=$(date +%s)
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| | |
| ## Get info on oldest generation
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| IFS=' ' read -r -a oldestGenArr <<< "${nixGens[0]}"
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| oldestGen=${oldestGenArr[0]}
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| oldestDate=${oldestGenArr[1]}
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| printf "%-30s %s\n" "oldest generation:" $oldestGen
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| #oldestDate=${nixGens[0]:3:19}
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| printf "%-30s %s\n" "oldest generation created:" $oldestDate
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| oldestTime=$(date -d "$oldestDate" +%s)
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| oldestElapsedSecs=$((timeNow-oldestTime))
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| oldestElapsedMins=$((oldestElapsedSecs/60))
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| oldestElapsedHours=$((oldestElapsedMins/60))
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| oldestElapsedDays=$((oldestElapsedHours/24))
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| printf "%-30s %s\n" "minutes before now:" $oldestElapsedMins
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| printf "%-30s %s\n" "hours before now:" $oldestElapsedHours
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| printf "%-30s %s\n\n" "days before now:" $oldestElapsedDays
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| | |
| ## Get info on current generation
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| for i in "${nixGens[@]}"; do
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| IFS=' ' read -r -a iGenArr <<< "$i"
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| genNumber=${iGenArr[0]}
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| genDate=${iGenArr[1]}
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| if [[ "$i" =~ current ]]; then
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| currentGen=$genNumber
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| printf "%-30s %s\n" "current generation:" $currentGen
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| currentDate=$genDate
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| printf "%-30s %s\n\n" "current generation created:" $currentDate
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| currentTime=$(date -d "$currentDate" +%s)
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| fi
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| done
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| | |
| ## Compare oldest and current generations
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| timeBetweenOldestAndCurrent=$((currentTime-oldestTime))
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| elapsedDays=$((timeBetweenOldestAndCurrent/60/60/24))
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| generationsDiff=$((currentGen-oldestGen))
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| | |
| ## Figure out what we should do, based on generations and options
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| if [[ elapsedDays -le keepDays ]]; then
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| printf "All generations are no more than $keepDays days older than current generation. \nOldest gen days difference from current gen: $elapsedDays \n\n\tNothing to do!\n"
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| exit 4;
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| elif [[ generationsDiff -lt keepGens ]]; then
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| printf "Oldest generation ($oldestGen) is only $generationsDiff generations behind current ($currentGen). \t Nothing to do!\n"
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| exit 5;
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| else
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| printf "\tSomething to do...\n"
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| declare -a gens
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| for i in "${nixGens[@]}"; do
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| IFS=' ' read -r -a iGenArr <<< "$i"
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| genNumber=${iGenArr[0]}
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| genDiff=$((currentGen-genNumber))
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| genDate=${iGenArr[1]}
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| genTime=$(date -d "$genDate" +%s)
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| elapsedSecs=$((timeNow-genTime))
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| genDaysOld=$((elapsedSecs/60/60/24))
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| if [[ genDaysOld -gt keepDays ]] && [[ genDiff -ge keepGens ]]; then
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| gens["$genNumber"]="$genDate, $genDaysOld day(s) old"
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| fi
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| done
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| printf "\nFound the following generation(s) to delete:\n"
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| for K in "${!gens[@]}"; do
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| printf "generation $K \t ${gens[$K]}\n"
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| done
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| printf "\n"
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| choose "y" "Do you want to delete these? [Y/n]: "
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| fi
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| </nowiki>}}
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