dev January 2023

dev@openadk.org

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[PATCH] package: cfgfs: implement 'diff' command

by Phil Sutter

Sometimes it is unclear how exactly files changed in /etc and the md5sum is no help there. Implement a diff command for these situations. It is pretty inefficient since it has to perform a second 'setup' before the actual 'diff' call. To cover for missing recursion support (and also exclude internal files) by calling diff for each file separately. Signed-off-by: Phil Sutter <phil(a)nwl.cc> --- package/cfgfs/src/fwcf.sh | 42 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 40 insertions(+), 2 deletions(-) diff --git a/package/cfgfs/src/fwcf.sh b/package/cfgfs/src/fwcf.sh index c6008e93ad7c6..0d572595a50d6 100644 --- a/package/cfgfs/src/fwcf.sh +++ b/package/cfgfs/src/fwcf.sh @@ -56,7 +56,7 @@ usage() { $what Usage: { halt | poweroff | reboot } [-Ffn] [-d delay] - cfgfs { commit | erase | setup | status | dump | restore } [flags] + cfgfs { commit | erase | setup | status | diff | dump | restore } [flags] EOF exit 1 } @@ -101,7 +101,7 @@ if [[ $me != cfgfs ]]; then fi case $1 in -(commit|erase|setup|status|dump|restore) ;; +(commit|erase|setup|status|diff|dump|restore) ;; (*) cat >&2 <<EOF $what Syntax: @@ -109,6 +109,7 @@ $what $0 erase $0 setup [-N] $0 status [-rq] + $0 diff [<diff options>] $0 { dump | restore } [<filename>] EOF exit 1 ;; @@ -435,5 +436,42 @@ if test $1 = restore; then exit 0 fi +if test $1 = diff; then + if test ! -e /tmp/.cfgfs; then + cat >&2 <<-EOF + cfgfs: error: not yet initialised + explanation: "cfgfs setup" was not yet run + EOF + [[ $1 = -f ]] || exit 11 + fi + shift + tempd=/tmp/.cfgfs/temp + mount -t tmpfs none $tempd + (cd /tmp/.cfgfs/root; tar cf - .) | (cd $tempd; tar xpf - 2>/dev/null) + x=$(dd if="$part" bs=4 count=1 2>/dev/null) + [[ "$x" = "FWCF" ]] && cfgfs.helper -U $tempd <"$part" + + if test -e $tempd/.cfgfs_deleted; then + while IFS= read -r file; do + rm -f "$tempd/$file" + done <$tempd/.cfgfs_deleted + rm -f $tempd/.cfgfs_deleted + fi + (cd /etc; find . -type f; \ + cd $tempd; find . -type f \ + ) | grep -v -e '^./.cfgfs' -e '^./.rnd$' | sort -u | while read f; do + f=${f#./} + if [ ! -e "/etc/$f" ]; then + echo "Deleted: /etc/$f" + elif [ ! -e "$tempd/$f" ]; then + echo "New: /etc/$f" + else + diff "$@" "$tempd/$f" "/etc/$f" + fi + done + umount $tempd + exit 0 +fi + echo 'cfgfs: cannot be reached...' exit 255 -- 2.38.0

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dev January 2023