nixpkgs/maintainers/scripts/update-channel-branches.sh

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#!/bin/sh
: ${NIXOS_CHANNELS:=https://nixos.org/channels/}
# Find the name of all channels which are listed in the directory.
for channelName in : $(curl -s $NIXOS_CHANNELS | sed -n '/folder/ { s,.*href=",,; s,/".*,,; p }'); do
test "$channelName" = : && continue;
# Do not follow redirections, such that we can extract the
# short-changeset from the name of the directory where we are
# redirected to.
sha1=$(curl -sI $NIXOS_CHANNELS$channelName | sed -n '/Location/ { s,.*\.\([a-f0-9]*\)[ \r]*$,\1,; p; }')
test -z "$sha1" -o -z "$channelName" && continue;
# Update the local refs/heads/channels/remotes/* branches to be
# in-sync with the channel references.
git update-ref refs/heads/channels/remotes/$channelName $sha1
done
if currentSystem=$(nixos-version 2>/dev/null); then
channelName=current-system
# If the system is entirely build from a custom nixpkgs version,
# then the version is not annotated in git version. This sed
# expression is basically matching that the expressions end with
# ".<sha1> (Name)" to extract the sha1.
sha1=$(echo $currentSystem | sed -n 's,^.*\.\([a-f0-9]*\) *(.*)$,\1,; T skip; p; :skip;')
if test -n "$sha1"; then
# Update the local refs/heads/channels/locals/* branches to be
# in-sync with the channel references.
git update-ref refs/heads/channels/locals/$channelName $sha1
fi
fi
for revFile in : $(find -L ~/.nix-defexpr/ -maxdepth 4 -name svn-revision); do
test "$revFile" = : && continue;
# Deconstruct a path such as, into:
# /home/luke/.nix-defexpr/channels_root/nixos/nixpkgs/svn-revision
# user=root repo=nixos channelName=root/nixos
#
# /home/luke/.nix-defexpr/channels/nixpkgs/svn-revision
# user=luke repo=nixpkgs channelName=luke/nixpkgs
user=${revFile#*.nix-defexpr/channels}
repo=${user#*/}
repo=${repo%%/*}
user=${user%%/*}
user=${user#_}
test -z "$user" && user=$USER
channelName="$user/$repo"
sha1=$(cat $revFile | sed -n 's,^.*\.\([a-f0-9]*\)$,\1,; T skip; p; :skip;')
test -z "$sha1" -o -z "$channelName" && continue;
# Update the local refs/heads/channels/locals/* branches to be
# in-sync with the channel references.
git update-ref refs/heads/channels/locals/$channelName $sha1
done