This new mode, which must be run as root, allows for the precaching of packages which can then subsequently be updated by calling "pacman -Syu" as normal. This can then be integrated with a cron script (for example, checkupdates-cron[0]) for automated, safe downloading of packages alongside getting the list of packages to update, or run manually on the command line to download new packages, but avoid updating the main package database.

As a side effect of adding the -d option, argument handling (which was previously not present) is now done using "getopts". This seems like a reasonable way to do it instead of just hacking in a check for "-d" as $1 now, but I'm not particularly averse to either. "getopts" would just allow for better future flexibility in this area.

It is possible to do this as another script, say, downloadupdates, but we would encounter pretty heavy code duplication with "checkupdates", so it seems more sensible to do it here.

Due to the use of --noconfirm, this has some limitations when we encounter more complex upgrade scenarios, for example when a new package conflict occurs, an upgrade path cannot be correctly/automatically determined, a package was replaced, etc. This is not a major problem -- in the worst case, we just don't get the packages that we wanted downloaded and an error message is displayed to the user.

The choice to hide both STDOUT and STDERR of "pacman -Syuw" is potentially up for debate. It makes it more difficult to determine where the problem was if the command fails -- we still display a message saying that that was the case, and set the exit code accordingly, but the actual cause needs to be determined by the user elsewhere. For this reason, "-p" exists to force the package download to output as normal.

It seems desirable that "-p" also affects the silence of the database update, but this is also up for discussion if people feel it should not be within the remit of the (( silent )) checks.

[0]: https://github.com/cdown/checkupdates-cron --- contrib/checkupdates.sh.in | 44 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/contrib/checkupdates.sh.in b/contrib/checkupdates.sh.in index 413b78a..4a74632 100644 --- a/contrib/checkupdates.sh.in +++ b/contrib/checkupdates.sh.in @@ -21,16 +21,46 @@ declare -r myname='checkupdates' declare -r myver='@PACKAGE_VERSION@'

-if (( $# > 0 )); then +download=0 +silent=1 + +usage() { echo "${myname} (pacman) v${myver}" echo echo "Safely print a list of pending updates" echo echo "Usage: ${myname}" echo + echo "Options:" + echo " -d Download upgradeable packages to pacman package cache." + echo " -p Print pacman output from the database upgrade and package download." + echo echo 'Note: Export the "CHECKUPDATES_DB" variable to change the path of the temporary database.' exit 0 -fi +} + +run_silent() { + { + (( silent )) && exec &>/dev/null + "$@" + } +} + + +while getopts ':dp' opt; do + case $opt in + d) + if (( UID )); then + echo "Download mode can only be run as root." >&2 + exit 2 + fi + + download=1 + ;; + p) silent=0 ;; + ?) usage ;; + esac +done

if [[ -z $CHECKUPDATES_DB ]]; then CHECKUPDATES_DB="${TMPDIR:-/tmp}/checkup-db-${USER}/" @@ -43,9 +73,17 @@ eval $(awk -F' *= *' '$1 ~ /DBPath/ { print $1 "=" $2 }' @sysconfdir@/pacman.con

mkdir -p "$CHECKUPDATES_DB" ln -s "${DBPath}/local" "$CHECKUPDATES_DB" &> /dev/null -fakeroot pacman -Sy --dbpath "$CHECKUPDATES_DB" --logfile /dev/null &> /dev/null +run_silent fakeroot pacman -Sy --dbpath "$CHECKUPDATES_DB" --logfile /dev/null pacman -Qqu --dbpath "$CHECKUPDATES_DB" 2> /dev/null

+if (( download )); then + if ! run_silent pacman -Suw --noconfirm --dbpath "$CHECKUPDATES_DB"; then + ret=$? + (( silent )) && echo "Failed to download packages." >&2 + exit "$ret" + fi +fi + exit 0

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