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Use a temporary copy of our tar binary during OTA updating, to avoid the

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potential for a SIGBUS error...

Fix #4602
This commit is contained in:
NiLuJe
2019-02-17 22:57:05 +01:00
committed by Frans de Jonge
parent 3bc29aa618
commit a3f8e49a0d
1 changed files with 6 additions and 1 deletions
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7
platform/kindle/koreader.sh
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@@ -107,9 +107,14 @@ ko_update_check() {
FILESIZE="$(stat -c %b "${NEWUPDATE}")"
BLOCKS="$((FILESIZE / 20))"
export CPOINTS="$((BLOCKS / 100))"
# NOTE: To avoid blowing up when tar truncates itself during an update, copy our GNU tar binary to the system's tmpfs,
# and run that one (c.f., #4602)...
cp -pf ./tar /var/tmp/gnutar
# shellcheck disable=SC2016
./tar --no-same-permissions --no-same-owner --checkpoint="${CPOINTS}" --checkpoint-action=exec='./fbink -q -y -6 -P $(($TAR_CHECKPOINT/$CPOINTS))' -C "/mnt/us" -xf "${NEWUPDATE}"
/var/tmp/gnutar --no-same-permissions --no-same-owner --checkpoint="${CPOINTS}" --checkpoint-action=exec='./fbink -q -y -6 -P $(($TAR_CHECKPOINT/$CPOINTS))' -C "/mnt/us" -xf "${NEWUPDATE}"
fail=$?
# And remove our temporary tar binary...
rm -f /var/tmp/gnutar
# Cleanup behind us...
if [ "${fail}" -eq 0 ]; then
mv "${NEWUPDATE}" "${INSTALLED}"