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#!/usr/bin/env bash
source $(dirname ${BASH_SOURCE[0]})/nix-utils.sh
usage() {
cat <<EOS
$(help_synopsis "${BASH_SOURCE[0]}" "[-s | -u] [-n <a..b>] [-h]")
-s Use system generation for diffing
-u Use system generation for diffing
-n a..b Diff these generations
-h Show this help and exit
Show the diff between two generations, so the installed and removed
packages.
Example usage:
# To show the diff of the system generation 123 to 145
# with verbosity on
nix-script -v diff-generations -s -n 123..145
$(help_end "${BASH_SOURCE[0]}")
EOS
}
__SYSTEM=0
__USER=0
GEN_A=
GEN_B=
while getopts "sun:h" OPTION
do
case $OPTION in
s)
stdout "Setting profile: system"
__SYSTEM=1
__USER=0
;;
u)
stdout "Setting profile: user ($USER)"
__SYSTEM=0
__USER=1
;;
n)
GEN_A=$(echo $OPTARG | cut -d "." -f 1)
GEN_B=$(echo $OPTARG | cut -d "." -f 3)
dbg "Parsing generations: $OPTARG"
dbg "Parsing generations: GEN_A: $GEN_A"
dbg "Parsing generations: GEN_B: $GEN_B"
[[ -z "$GEN_A" || -z "$GEN_B" ]] && \
stderr "Parsing error for '$OPTARG'" && usage && exit 1
;;
h)
usage
exit 1
;;
esac
done
#
# Helper to generate a path for the profile we want to diff with
#
gen_path() {
[[ $__SYSTEM -eq 1 ]] && echo "/nix/var/nix/profiles/system-${1}-link"
[[ $__USER -eq 1 ]] && echo "/nix/var/nix/profiles/per-user/$USER/profile-${1}-link"
}
DIR_A=$(gen_path $GEN_A)
DIR_B=$(gen_path $GEN_B)
dbg "VERBOSE : $VERBOSE"
dbg "SYSTEM : $__SYSTEM"
dbg "USER : $__USER"
dbg "Generation A : $GEN_A"
dbg "from directory : $DIR_A"
dbg "Generation B : $GEN_B"
dbg "from directory : $DIR_B"
#
# Error checking whether the generations exist.
#
[[ -z "$GEN_A" || -z "$GEN_B" ]] && stderr "No generations" && exit 1
[[ ! -e $DIR_A ]] && stderr "Generation $GEN_A does not exist." && exit 1
[[ ! -e $DIR_B ]] && stderr "Generation $GEN_B does not exist." && exit 1
#
# Querying the store for the stuff in a generation A
#
versA=$(mktemp)
stdout "TMP file '$versA' created"
nix-store -qR $DIR_A | sort -t'-' -k 2 > $versA
stdout "Generation packages written for $GEN_A"
#
# Querying the store for the stuff in a generation B
#
versB=$(mktemp)
stdout "TMP file '$versB' created"
nix-store -qR $DIR_B | sort -t'-' -k 2 > $versB
stdout "Generation packages written for $GEN_B"
stdout "Diffing now..."
diff -u $versA $versB | \
# Select only lines that differ.
# (no context, no file name, no line number, etc.)
grep '^[+-]/nix/store' | \
# Remove the "/nix/store/<hash>" garbage.
# Add a space instead, to separate the [+-] from the name.
sed 's:/nix/store/[^-]*-: :' | \
# sort by name, then prefer '+' over '-'.
sort -k 2 -k 1,1r
stdout "Removing tmp directories"
rm $versA
rm $versB
stdout "Ready"
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