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Gherald
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Joined: 23 Aug 2004
Posts: 1399
Location: CLUAConsole
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 Posted: Mon Apr 04, 2005 7:32 am Post subject: md5-update proof of concept |
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It has always irked me how portage and etc-update do not have a good mechanism for dealing with config files that have not been changed since they were last installed.
For instance, if I'm upgrading X.org from version-A to version-B, what do I care if some obscure file in /etc/X11 is different between them? As long as the file version-A installed was never altered, I couldn't care less whether version-B replaces it with something newer.
md5-update is my solution to this annoyance.
Be sure to place it in your $PATH somewhere -- like /usr/local/bin -- because it will viraly propagate a call to itself from etc-update.
| Code: | #!/bin/bash
source /sbin/functions.sh
if [[ $1 == -h || $1 == -help || $1 == --help ]]; then echo -e \
'md5-update 0.0.1, proof of concept by Freeix Gherald
This script sets your system up to maintain hardlinks of /var/db/pkg
entries, which do not go away after a package is updated.
This allows md5 checks of old config files and eliminates
part of the drudge work of running etc-update.'
exit 0
fi
WRAPPER="/usr/local/bin/emerge"
if [ ! -x ${WRAPPER} ]; then
ewarn "Creating emerge wrapper ${WRAPPER}"
echo '#!/bin/bash
/usr/bin/emerge ${@}
EXIT_CODE=$?
source /sbin/functions.sh
PKG_DIR=`/usr/lib/portage/bin/portageq vdb_path`
PKG_HIST_DIR="${PKG_DIR}hist"
if [ ! -d ${PKG_HIST_DIR} ]; then
ewarn "Creating package history repository ${PKG_HIST_DIR}..."
mkdir ${PKG_HIST_DIR}
fi
cp -Rlf ${PKG_DIR}/* ${PKG_HIST_DIR}
exit $EXIT_CODE' >| ${WRAPPER}
chmod 755 ${WRAPPER}
fi
if [ ! -d ${PKG_HIST_DIR} ]; then
${WRAPPER} >/dev/null
ewarn "Run md5-update after you've updated some packages!"
exit 1
fi
ETC_PATH=`which etc-update`
if grep '^scan$' ${ETC_PATH} >/dev/null; then
ewarn "Patching etc-update..."
perl -pi -e 's/^scan$/scan\; md5-update/' ${ETC_PATH}
fi
ETC_PID=`pgrep etc-upd`
if [ -z ${ETC_PID} ]; then
etc-update; exit
fi
PKG_DIR=`/usr/lib/portage/bin/portageq vdb_path`
PKG_HIST_DIR="${PKG_DIR}hist"
MD5_TMP="/dev/shm/$$-md5-update"
ETC_FILES="/tmp/${ETC_PID}/files"
# Make sure etc-update actually found some files to update
[[ $(ls -A ${ETC_FILES} | while read line; do echo $line; done | wc -l) == 0 ]] && exit 0
# Phew, setup is done. Now the actual fun begins.
for etc in ${ETC_FILES}/*; do
# Use a temp file and fd 3 instead of just piping the grep directly
# to "while read line", so as to not interfere with "mv -i ..." later.
grep -R " $(head -n1 ${etc}) " ${PKG_HIST_DIR}/*/*/CONTENTS >| ${MD5_TMP}
exec 3<${MD5_TMP}; while read -u 3 line; do
# echo $line
prev_md5=`echo ${line} | awk '{print $3}'`
fname=`echo ${line} | awk '{print $2}'`
cur_md5=`md5sum "${fname}" | awk '{print $1}'`
pkg_name=`echo $line | awk '{print $1}'`
pkg_name=${pkg_name#/*/*/*/}
pkg_name=${pkg_name%/*}
if [[ ${cur_md5} == ${prev_md5} ]]; then
[ ! -e ${etc} ] && continue
einfo "$fname ;-) $pkg_name"
for rfile in $(tail -n +2 "${etc}"); do
echo -n "${rfile} -> ${fname} [y|N] "
/bin/mv -i ${rfile} ${fname} 2> /dev/null
[ -e ${rfile} ] || /bin/rm -f ${etc}
done #looping over ._cfg????_* files
else
# If you want to see failed md5 checks, uncomment the next line.
# eerror "$fname :-( $pkg_name"
true
fi
done
done
/bin/rm -f ${MD5_TMP} |
If you have any ideas for getting around using /usr/local/bin to wrap emerge, let me know.
Also using /dev/shm/$$-md5-update as temp storage for information being piped between grep and "while read line" so as to not interfere with the nested "mv -i" feels kind of hackish... but it works. |
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moocha
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Joined: 21 Oct 2003
Posts: 5722
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| Posted: Mon Apr 04, 2005 8:03 am Post subject: Re: md5-update proof of concept |
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| freeix wrote: | | It has always irked me how portage and etc-update do not have a good mechanism for dealing with config files that have not been changed since they were last installed. |
Which is why most of the Gentoo'ers (including yours truly) no longer use etc-update but have switched to dispatch-conf, which does.
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Gherald
Veteran
Joined: 23 Aug 2004
Posts: 1399
Location: CLUAConsole
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| Posted: Mon Apr 04, 2005 8:05 am Post subject: |
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Maybe if it supported vimdiff. There's a patch at bug #73129, but it didn't work for me.
All in all I wasn't thrilled with any of dispatch-conf's other "features", either, so I'm sticking with etc-update seeing as this md5-update script fixes the only beef I ever had with it.
It's nice to see that dispatch-conf is included in the default portage install now... one less thing to worry about, asuming it ever starts meeting my needs. |
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