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#!/usr/bin/env bash
source $(dirname ${BASH_SOURCE[0]})/nix-utils.sh
usage() {
cat <<EOS >&2
$(help_synopsis "channel" "diff-generations [-g <command>] [-w <path>] [-n <generations>] [-h]")
-g <command> | Use this command instead of 'diff --name-only' (currently no support for multi-word args)
-w <path> | Path to working-copy of nixpkgs git repo, default: $RC_NIXPKGS
-n <generations> | Generations to show diff in form a..b
-h | Show this help and exit
$(help_end "channel")
EOS
}
GEN_A=
GEN_B=
WC=$RC_NIXPKGS
GIT="diff --name-only"
explain() {
stdout $*
$*
}
while getopts "g:w:n:h" OPTION
do
case $OPTION in
g)
GIT=$OPTARG
dbg "GIT = $GIT"
;;
w)
WC=$OPTARG
dbg "WC = $WC"
;;
n)
GEN_A=$(echo $OPTARG | cut -d "." -f 1)
GEN_B=$(echo $OPTARG | cut -d "." -f 3)
[[ -z "$GEN_A" || -z "$GEN_B" ]] && \
stderr "Parsing error for '$OPTARG'" && usage && exit 1
dbg "GEN_A = $GEN_A"
dbg "GEN_B = $GEN_B"
;;
h)
usage
exit 1
;;
esac
done
[[ -z "$GEN_A" || -z "$GEN_B" ]] && \
stderr "No generation information" && usage && exit 1
pathof() {
echo "/nix/var/nix/profiles/per-user/root/channels-$1-link/nixos/nixpkgs/.version-suffix"
}
version_string() {
local path=$(pathof $1)
local version=$(cat $path)
[[ -z "$version" ]] && \
stderr "No commit version information for generation $1" && exit 1
echo $version
}
commit_for() {
echo $(version_string $1) | cut -d . -f 2
}
__git() {
explain git --git-dir="$WC/.git" --work-tree="$WC" $*
}
A=$(commit_for $GEN_A)
B=$(commit_for $GEN_B)
stdout "A = $A"
stdout "B = $B"
[[ "$A" -eq "$B" ]] && \
echo "Same hash for both generations. There won't be a diff" && exit 1
if [[ -z "$WC" ]]
then
echo "$A..$B"
else
__git $GIT "$A..$B"
fi
stdout "Ready"
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