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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 "$line"
fi
done
}
generate_metadata() {
# This function generates the script commands to fix any files
# that aren't owner=root, group=root, or mode=0644 or 0755.
# The script is produced on stdout. Errors go to stderr.
# We maintain the permissions on the directory containing VCS data
# but we want find to ignore the VCS files themselves.
NOVCS='. -wholename ./.git -prune -o -wholename ./.bzr -prune -o -wholename ./.hg -prune -o'
if [ "$VCS" = git ] || [ "$VCS" = hg ]; then
# These version control systems do not track directories,
# so empty directories must be stored specially.
find $NOVCS -type d -empty | sort | \
sed -e "s/^/mkdir -p '/" -e "s/\$/'/"
fi
# Find all files and directories that don't have root as the owner
find $NOVCS \! -user root -exec stat --format="chown %U '{}'" {} \; \
| sort | filter_unknown chown owner
# Find all files and directories that don't have root as the group
find $NOVCS \! -group root -exec stat --format="chgrp %G '{}'" {} \; \
| sort | filter_unknown chgrp group
# Find all directories that aren't 0755
find $NOVCS -type d \! -perm 0755 \
-exec stat --format="chmod %a '{}'" {} \; | sort
# Find all files that aren't 0644 or 0755 (we can assume the VCS will
# maintain the executable bit).
find $NOVCS -type f \! -perm 0644 \! -perm 0755 \
-exec stat --format="chmod %a '{}'" {} \; | sort
# We don't handle xattrs.
# Maybe check for getfattr/setfattr and use them if they're available?
}
if [ "$VCS" = git ] || [ "$VCS" = hg ] || [ "$VCS" = bzr ]; then
# ensure the file exists so that it will list its own metadata
if [ ! -e .etckeeper ]; then
touch .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
fi
echo "# Generated by etckeeper. Do not edit." > .etckeeper
echo >> .etckeeper
generate_metadata >> .etckeeper
# stage the file as part of the current commit
if [ "$VCS" = git ]; then
# this will do nothing if the metadata file is unchanged.
git add .etckeeper
fi
# hg and bzr add not done, they will automatically
# include the file in the current commit
# Finally, VCS remove obsolete .metadata (as long as VCS is set)
if [ -f .metadata ] && [ "x$VCS" != "x" ]; then
$VCS rm .metadata
fi
fi
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