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Diffstat (limited to 'maintainers/scripts/nix-diff.sh')
| -rwxr-xr-x | maintainers/scripts/nix-diff.sh | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/maintainers/scripts/nix-diff.sh b/maintainers/scripts/nix-diff.sh new file mode 100755 index 00000000000..0c65e29cf43 --- /dev/null +++ b/maintainers/scripts/nix-diff.sh @@ -0,0 +1,277 @@ +#!/usr/bin/env nix-shell +#! nix-shell -i bash -p coreutils gnugrep gnused + +################################################################################ +# nix-diff.sh # +################################################################################ +# This script "diffs" Nix profile generations. # +# # +# Example: # +################################################################################ +# > nix-diff.sh 90 92 # +# + gnumake-4.2.1 # +# + gnumake-4.2.1-doc # +# - htmldoc-1.8.29 # +################################################################################ +# The example shows that as of generation 92 and since generation 90, # +# gnumake-4.2.1 and gnumake-4.2.1-doc have been installed, while # +# htmldoc-1.8.29 has been removed. # +# # +# The example above shows the default, minimal output mode of this script. # +# For more features, run `nix-diff.sh -h` for usage instructions. # +################################################################################ + +usage() { + cat <<EOF +usage: nix-diff.sh [-h | [-p profile | -s] [-q] [-l] [range]] +-h: print this message before exiting +-q: list the derivations installed in the parent generation +-l: diff every available intermediate generation between parent and + child +-p profile: specify the Nix profile to use + * defaults to ~/.nix-profile +-s: use the system profile + * equivalent to: -p /nix/var/nix/profiles/system +profile: * should be something like /nix/var/nix/profiles/default, not a + generation link like /nix/var/nix/profiles/default-2-link +range: the range of generations to diff + * the following patterns are allowed, where A, B, and N are positive + integers, and G is the currently active generation: + A..B => diffs from generation A to generation B + ~N => diffs from the Nth newest generation (older than G) to G + A => diffs from generation A to G + * defaults to ~1 +EOF +} + +usage_tip() { + echo 'run `nix-diff.sh -h` for usage instructions' >&2 + exit 1 +} + +while getopts :hqlp:s opt; do + case $opt in + h) + usage + exit + ;; + q) + opt_query=1 + ;; + l) + opt_log=1 + ;; + p) + opt_profile=$OPTARG + ;; + s) + opt_profile=/nix/var/nix/profiles/system + ;; + \?) + echo "error: invalid option -$OPTARG" >&2 + usage_tip + ;; + esac +done +shift $((OPTIND-1)) + +if [ -n "$opt_profile" ]; then + if ! [ -L "$opt_profile" ]; then + echo "error: expecting \`$opt_profile\` to be a symbolic link" >&2 + usage_tip + fi +else + opt_profile=$(readlink ~/.nix-profile) + if (( $? != 0 )); then + echo 'error: unable to dereference `~/.nix-profile`' >&2 + echo 'specify the profile manually with the `-p` flag' >&2 + usage_tip + fi +fi + +list_gens() { + nix-env -p "$opt_profile" --list-generations \ + | sed -r 's:^\s*::' \ + | cut -d' ' -f1 +} + +current_gen() { + nix-env -p "$opt_profile" --list-generations \ + | grep -E '\(current\)\s*$' \ + | sed -r 's:^\s*::' \ + | cut -d' ' -f1 +} + +neg_gen() { + local i=0 from=$1 n=$2 tmp + for gen in $(list_gens | sort -rn); do + if ((gen < from)); then + tmp=$gen + ((i++)) + ((i == n)) && break + fi + done + if ((i < n)); then + echo -n "error: there aren't $n generation(s) older than" >&2 + echo " generation $from" >&2 + return 1 + fi + echo $tmp +} + +match() { + argv=("$@") + for i in $(seq $(($#-1))); do + if grep -E "^${argv[$i]}\$" <(echo "$1") >/dev/null; then + echo $i + return + fi + done + echo 0 +} + +case $(match "$1" '' '[0-9]+' '[0-9]+\.\.[0-9]+' '~[0-9]+') in + 1) + diffTo=$(current_gen) + diffFrom=$(neg_gen $diffTo 1) + (($? == 1)) && usage_tip + ;; + 2) + diffFrom=$1 + diffTo=$(current_gen) + ;; + 3) + diffFrom=${1%%.*} + diffTo=${1##*.} + ;; + 4) + diffTo=$(current_gen) + diffFrom=$(neg_gen $diffTo ${1#*~}) + (($? == 1)) && usage_tip + ;; + 0) + echo 'error: invalid invocation' >&2 + usage_tip + ;; +esac + +dirA="${opt_profile}-${diffFrom}-link" +dirB="${opt_profile}-${diffTo}-link" + +declare -a temp_files +temp_length() { + echo -n ${#temp_files[@]} +} +temp_make() { + temp_files[$(temp_length)]=$(mktemp) +} +temp_clean() { + rm -f ${temp_files[@]} +} +temp_name() { + echo -n "${temp_files[$(($(temp_length)-1))]}" +} +trap 'temp_clean' EXIT + +temp_make +versA=$(temp_name) +refs=$(nix-store -q --references "$dirA") +(( $? != 0 )) && exit 1 +echo "$refs" \ + | grep -v env-manifest.nix \ + | sort \ + > "$versA" + +print_tag() { + local gen=$1 + nix-env -p "$opt_profile" --list-generations \ + | grep -E "^\s*${gen}" \ + | sed -r 's:^\s*::' \ + | sed -r 's:\s*$::' +} + +if [ -n "$opt_query" ]; then + print_tag $diffFrom + cat "$versA" \ + | sed -r 's:^[^-]+-(.*)$: \1:' + + print_line=1 +fi + +if [ -n "$opt_log" ]; then + gens=$(for gen in $(list_gens); do + ((diffFrom < gen && gen < diffTo)) && echo $gen + done) + # Force the $diffTo generation to be included in this list, instead of using + # `gen <= diffTo` in the preceding loop, so we encounter an error upon the + # event of its nonexistence. + gens=$(echo "$gens" + echo $diffTo) +else + gens=$diffTo +fi + +temp_make +add=$(temp_name) +temp_make +rem=$(temp_name) +temp_make +out=$(temp_name) + +for gen in $gens; do + + [ -n "$print_line" ] && echo + + temp_make + versB=$(temp_name) + + dirB="${opt_profile}-${gen}-link" + refs=$(nix-store -q --references "$dirB") + (( $? != 0 )) && exit 1 + echo "$refs" \ + | grep -v env-manifest.nix \ + | sort \ + > "$versB" + + in=$(comm -3 -1 "$versA" "$versB") + sed -r 's:^[^-]*-(.*)$:\1+:' <(echo "$in") \ + | sort -f \ + > "$add" + + un=$(comm -3 -2 "$versA" "$versB") + sed -r 's:^[^-]*-(.*)$:\1-:' <(echo "$un") \ + | sort -f \ + > "$rem" + + cat "$rem" "$add" \ + | sort -f \ + | sed -r 's:(.*)-$:- \1:' \ + | sed -r 's:(.*)\+$:\+ \1:' \ + | grep -v '^$' \ + > "$out" + + if [ -n "$opt_query" -o -n "$opt_log" ]; then + + lines=$(wc -l "$out" | cut -d' ' -f1) + tag=$(print_tag "$gen") + (( $? != 0 )) && exit 1 + if [ $lines -eq 0 ]; then + echo "$tag (no change)" + else + echo "$tag" + fi + cat "$out" \ + | sed 's:^: :' + + print_line=1 + + else + echo "diffing from generation $diffFrom to $diffTo" + cat "$out" + fi + + versA=$versB + +done + +exit 0 |