Luke Granger-Brown
57725ef3ec
git-subtree-dir: third_party/nixpkgs git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
112 lines
3.8 KiB
Bash
Executable file
112 lines
3.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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: ${NIXOS_CHANNELS:=https://nixos.org/channels/}
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: ${CHANNELS_NAMESPACE:=refs/heads/channels/}
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# List all channels which are currently in the repository which we would
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# have to remove if they are not found again.
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deadChannels=$(git for-each-ref --format="%(refname)" "$CHANNELS_NAMESPACE")
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updateRef() {
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local channelName=$1
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local newRev=$2
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# if the inputs are not valid, then we do not update any branch.
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test -z "$newRev" -o -z "$channelName" && return;
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# Update the local refs/heads/channels/* branches to be in-sync with the
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# channel references.
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local branch=$CHANNELS_NAMESPACE$channelName
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oldRev=$(git rev-parse --short "$branch" 2>/dev/null || true)
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if test "$oldRev" != "$newRev"; then
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if git update-ref "$branch" "$newRev" 2>/dev/null; then
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if test -z "$oldRev"; then
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echo " * [new branch] $newRev -> ${branch#refs/heads/}"
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else
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echo " $oldRev..$newRev -> ${branch#refs/heads/}"
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fi
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else
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if test -z "$oldRev"; then
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echo " * [missing rev] $newRev -> ${branch#refs/heads/}"
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else
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echo " [missing rev] $oldRev..$newRev -> ${branch#refs/heads/}"
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fi
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fi
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fi
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# Filter out the current channel from the list of dead channels.
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deadChannels=$(grep -v "$CHANNELS_NAMESPACE$channelName" <<EOF
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$deadChannels
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EOF
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) ||true
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}
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# Find the name of all channels which are listed in the directory.
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echo "Fetching channels from $NIXOS_CHANNELS:"
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for channelName in : $(curl -s "$NIXOS_CHANNELS" | sed -n '/folder/ { s,.*href=",,; s,/".*,,; p }'); do
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test "$channelName" = : && continue;
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# Do not follow redirections, such that we can extract the
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# short-changeset from the name of the directory where we are
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# redirected to.
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sha1=$(curl -sI "$NIXOS_CHANNELS$channelName" | sed -n '/Location/ { s,.*\.\([a-f0-9]*\)[ \r]*$,\1,; p; }')
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updateRef "remotes/$channelName" "$sha1"
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done
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echo "Fetching channels from nixos-version:"
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if currentSystem=$(nixos-version 2>/dev/null); then
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# If the system is entirely build from a custom nixpkgs version,
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# then the version is not annotated in git version. This sed
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# expression is basically matching that the expressions end with
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# ".<sha1> (Name)" to extract the sha1.
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sha1=$(echo "$currentSystem" | sed -n 's,^.*\.\([a-f0-9]*\) *(.*)$,\1,; T skip; p; :skip;')
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updateRef current-system "$sha1"
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fi
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echo "Fetching channels from $HOME/.nix-defexpr:"
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for revFile in : $(find -L "$HOME/.nix-defexpr/" -maxdepth 4 -name svn-revision); do
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test "$revFile" = : && continue;
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# Deconstruct a path such as, into:
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#
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# /home/luke/.nix-defexpr/channels_root/nixos/nixpkgs/svn-revision
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# channelName = root/nixos
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#
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# /home/luke/.nix-defexpr/channels/nixpkgs/svn-revision
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# channelName = nixpkgs
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#
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user=${revFile#*.nix-defexpr/channels}
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repo=${user#*/}
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repo=${repo%%/*}
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user=${user%%/*}
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user=${user#_}
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test -z "$user" && user=$USER
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channelName="$user${user:+/}$repo"
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sha1=$(sed -n 's,^.*\.\([a-f0-9]*\)$,\1,; T skip; p; :skip;' "$revFile")
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updateRef "$channelName" "$sha1"
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done
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# Suggest to remove channel branches which are no longer found by this
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# script. This is to handle the cases where a local/remote channel
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# disappear. We should not attempt to remove manually any branches, as they
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# might be user branches.
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if test -n "$deadChannels"; then
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echo "
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Some old channel branches are still in your repository, if you
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want to remove them, run the following command(s):
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"
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while read branch; do
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echo " git update-ref -d $branch"
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done <<EOF
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$deadChannels
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EOF
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echo
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fi
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