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#!/bin/sh
set -e
# Filters out UNKNOWN users and groups, prints a warning on stderr.
filter_unknown() {
CMD=$1
while read line; do
# if the first n chars of $line equal "$CMD UNKNOWN "...
if [ "$(printf %.$((9+${#CMD}))s "$line")" = "$CMD UNKNOWN " ]; then
echo Bad "$2" for "$line" >&2
else
echo "$line"
fi
done
}
generate_metadata() {
# This function generates the script commands to fix any files
# that aren't owner=root, group=root, or mode=0644 or 0755.
# The script is produced on stdout. Errors go to stderr.
#
# The script can use a 'maybe' function, which only runs a command
# if the file in its last argument exists.
# We maintain the permissions on the directory containing VCS data
# but we want find to ignore the VCS files themselves.
NOVCS='. -wholename ./.git -prune -o -wholename ./.bzr -prune -o -wholename ./.hg -prune -o'
# Keep the sort order the same at all times.
LC_COLLATE=C
export LC_COLLATE
if [ "$VCS" = git ] || [ "$VCS" = hg ]; then
# These version control systems do not track directories,
# so empty directories must be stored specially.
find -type d -empty | grep -v /.git/ | grep -v /.hg/ | grep -v /.bzr/ |
sort | sed -e "s/^/mkdir -p '/" -e "s/\$/'/"
fi
# Find all files and directories that don't have the current user as the owner
find $NOVCS \! -user "$USER" -exec stat --format="maybe chown %U '{}'" {} \; \
| sort | filter_unknown 'maybe chown' owner
# Find all files and directories that don't have root as the group
find $NOVCS \! -group $(id -g) -exec stat --format="maybe chgrp %G '{}'" {} \; \
| sort | filter_unknown 'maybe chgrp' group
# Find all directories that aren't 0755
find $NOVCS -type d \! -perm 0755 \
-exec stat --format="maybe chmod %a '{}'" {} \; | sort
# Find all files that aren't 0644 or 0755 (we can assume the VCS will
# maintain the executable bit).
find $NOVCS -type f \! -perm 0644 \! -perm 0755 \
-exec stat --format="maybe chmod %a '{}'" {} \; | sort
# We don't handle xattrs.
# Maybe check for getfattr/setfattr and use them if they're available?
}
if [ "$VCS" = git ] || [ "$VCS" = hg ] || [ "$VCS" = bzr ]; then
if [ -f .metadata ]; then
# remove obsolete .metadata file
# git allows fully deleting it at this point, other VCS
# may not (the repo is locked for hg).
if [ "$VCS" = git ]; then
$VCS rm .metadata
else
rm -f .metadata
fi
fi
echo "# Generated by etckeeper. Do not edit." > .etckeeper
echo >> .etckeeper
# Make sure the file is not readable by others, since it can leak
# information about contents of non-readable directories in /etc.
chmod 700 .etckeeper
generate_metadata >> .etckeeper
# stage the file as part of the current commit
if [ "$VCS" = git ]; then
# this will do nothing if the metadata file is unchanged.
git add .etckeeper
fi
# hg and bzr add not done, they will automatically
# include the file in the current commit
fi
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