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|
#!/bin/sh
set -e
: ${NIXOS_CHANNELS:=https://nixos.org/channels/}
: ${CHANNELS_NAMESPACE:=refs/heads/channels/}
# List all channels which are currently in the repository which we would
# have to remove if they are not found again.
deadChannels=$(git for-each-ref --format="%(refname)" "$CHANNELS_NAMESPACE")
updateRef() {
local channelName=$1
local newRev=$2
# if the inputs are not valid, then we do not update any branch.
test -z "$newRev" -o -z "$channelName" && return;
# Update the local refs/heads/channels/* branches to be in-sync with the
# channel references.
local branch=$CHANNELS_NAMESPACE$channelName
oldRev=$(git rev-parse --short "$branch" 2>/dev/null || true)
if test "$oldRev" != "$newRev"; then
if git update-ref "$branch" "$newRev" 2>/dev/null; then
if test -z "$oldRev"; then
echo " * [new branch] $newRev -> ${branch#refs/heads/}"
else
echo " $oldRev..$newRev -> ${branch#refs/heads/}"
fi
else
if test -z "$oldRev"; then
echo " * [missing rev] $newRev -> ${branch#refs/heads/}"
else
echo " [missing rev] $oldRev..$newRev -> ${branch#refs/heads/}"
fi
fi
fi
# Filter out the current channel from the list of dead channels.
deadChannels=$(grep -v "$CHANNELS_NAMESPACE$channelName" <<EOF
$deadChannels
EOF
) ||true
}
# Find the name of all channels which are listed in the directory.
echo "Fetching channels from $NIXOS_CHANNELS:"
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]*$,\1,; p; }')
updateRef "remotes/$channelName" "$sha1"
done
echo "Fetching channels from nixos-version:"
if currentSystem=$(nixos-version 2>/dev/null); then
# 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,^.*\.\([a-f0-9]*\) *(.*)$,\1,; T skip; p; :skip;')
updateRef current-system "$sha1"
fi
echo "Fetching channels from $HOME/.nix-defexpr:"
for revFile in : $(find -L "$HOME/.nix-defexpr/" -maxdepth 4 -name svn-revision); do
test "$revFile" = : && continue;
# Deconstruct a path such as, into:
#
# /home/luke/.nix-defexpr/channels_root/nixos/nixpkgs/svn-revision
# channelName = root/nixos
#
# /home/luke/.nix-defexpr/channels/nixpkgs/svn-revision
# channelName = nixpkgs
#
user=${revFile#*.nix-defexpr/channels}
repo=${user#*/}
repo=${repo%%/*}
user=${user%%/*}
user=${user#_}
test -z "$user" && user=$USER
channelName="$user${user:+/}$repo"
sha1=$(sed -n 's,^.*\.\([a-f0-9]*\)$,\1,; T skip; p; :skip;' "$revFile")
updateRef "$channelName" "$sha1"
done
# Suggest to remove channel branches which are no longer found by this
# script. This is to handle the cases where a local/remote channel
# disappear. We should not attempt to remove manually any branches, as they
# might be user branches.
if test -n "$deadChannels"; then
echo "
Some old channel branches are still in your repository, if you
want to remove them, run the following command(s):
"
while read branch; do
echo " git update-ref -d $branch"
done <<EOF
$deadChannels
EOF
echo
fi
|