Improved signal handling, removing result ISO if xorriso exits with error, redirected a few messages from stdout to stderr
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34981b1278
commit
5897c706a4
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@ -32,6 +32,8 @@ usage() {
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echo "Exported non-empty variable MERGE_FOR_DIST enforces the use of a" >&2
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echo "particular directory in /dists of iso1. Normally only one" >&2
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echo "such directory is found and thus no need to set MERGE_FOR_DIST." >&2
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echo "Exported non-empty variable MERGE_KEEP_ISO prevents the removal" >&2
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echo "of result_iso after xorriso indicated failure of production." >&2
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echo "Exported non-empty variable XORRISO overrides command xorriso." >&2
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echo "This may be needed if installed xorriso is older than 1.4.2." >&2
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echo 'If XORRISO is set to "dummy" then no new ISO will emerge.' >&2
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@ -82,39 +84,34 @@ check_single_word() {
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MOUNT_LIST=
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UMOUNT_LIST=
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RMDIR_LIST=
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TEMPFILE_LIST="merged_dists merged_md5sum.txt merged_README.txt temp_file"
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TEMPFILE_LIST=
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EMERGING_ISO=
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finish_cleanup() {
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if test -n "$1"
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# Cleanup temporary files, mount points and made directories
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cleanup_ignore_counter=0
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cleanup_ignore_handler() {
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cleanup_ignore_counter=$(expr "$cleanup_ignore_counter" + 1)
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if test "$cleanup_ignore_counter" -ge 4
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then
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echo >&2
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if test "$1" -gt 0
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then
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echo "--- Merge run aborted !" >&2
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else
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echo "Merge run ended with success indication." >&2
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fi
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exit "$1"
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# Reset traps to default
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trap - INT TERM QUIT
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echo "--- Ignored several INT, TERM, or QUIT signals during cleanup." >&2
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echo "--- Will give in to next signal." >&2
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return 0
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fi
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echo "--- Ignored INT, TERM, or QUIT signal during cleanup." >&2
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return 0
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}
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# Cleanup temporary files, mount points and made directories
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cleanup_ran=0
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cleanup() {
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cleanup_and_end() {
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# Remove trap
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trap - INT TERM QUIT EXIT
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if test "$cleanup_ran" = 1
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then
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finish_cleanup "$1"
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return 0
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fi
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cleanup_ran=1
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# Make sure to be in cleanup state of traps
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trap cleanup_ignore_handler INT TERM QUIT
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echo >&2
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echo "Cleaning up temporary files and mount points ..." 2>&1
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echo "Cleaning up temporary files and mount points ..." >&2
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ret=0
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@ -153,6 +150,28 @@ cleanup_and_end() {
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ret=1
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fi
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done
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if test -n "$EMERGING_ISO" && test -e "$EMERGING_ISO"
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then
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if test -n "$MERGE_KEEP_ISO"
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then
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echo "Removal of incomplete result ISO suppressed by MERGE_KEEP_ISO." >&2
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echo "Remaining: $EMERGING_ISO" >&2
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else
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echo "Removing incomplete result ISO." >&2
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echo \
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" (This can be suppressed by exporting non-empty variable MERGE_KEEP_ISO.)" \
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>&2
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if rm "$EMERGING_ISO"
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then
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dummy=dummy
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else
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echo "--- Note: Cannot remove incomplete result: $EMERGING_ISO" >&2
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ret=1
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fi
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fi
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fi
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if test "$ret" = 0
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then
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echo "Cleanup completed." >&2
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@ -160,14 +179,49 @@ cleanup_and_end() {
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echo "--- Cleanup could not be fully completed." >&2
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fi
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# Might exit
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finish_cleanup "$1"
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# Do not come back via trap again
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trap - INT TERM QUIT
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return $ret
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}
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# Handler for INT TERM QUIT events if "$1" is empty
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# Procedural program exit if "$1" is not empty
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cleanup_and_end() {
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# +++ No cleanup_and_end before TEMPFILE_LIST is verified to be missing +++
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# Early assume cleanup state of traps
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trap cleanup_ignore_handler INT TERM QUIT
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trap - EXIT
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if test -z "$1"
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then
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exit_value=6
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echo >&2
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echo "--- Encountered INT, TERM, or QUIT signal." >&2
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else
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exit_value="$1"
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fi
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cleanup
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echo >&2
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if test "$exit_value" -gt 0
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then
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echo "--- Merge run aborted !" >&2
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else
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echo "Merge run ended with success indication." >&2
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fi
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exit "$exit_value"
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}
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# Handler for rogue EXIT
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cleanup_for_exit() {
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# Early assume cleanup state of traps
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trap cleanup_ignore_handler INT TERM QUIT
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trap - EXIT
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cleanup
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echo >&2
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echo "--- Merge run ended by unexpected EXIT event !" >&2
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}
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## Check arguments and dependencies
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@ -191,7 +245,7 @@ do
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then
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dummy=dummy
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else
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echo "--- Missing a helper program: $i" 2>&1
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echo "--- Missing a helper program: $i" >&2
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missing=1
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fi
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done
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@ -210,16 +264,16 @@ then
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dummy=dummy
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else
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echo '--- Help text of xorriso program '"$XORRISO"' lacks word "replay".' \
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2>&1
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echo "--- It will fail when trying to make the new ISO bootable." 2>&1
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echo " Consider to get and compile GNU xorriso from" 2>&1
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echo " https://www.gnu.org/software/xorriso" 2>&1
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echo " and to export variable XORRISO with the binary's path." 2>&1
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>&2
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echo "--- It will fail when trying to make the new ISO bootable." >&2
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echo " Consider to get and compile GNU xorriso from" >&2
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echo " https://www.gnu.org/software/xorriso" >&2
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echo " and to export variable XORRISO with the binary's path." >&2
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echo >&2
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missing=1
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fi
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else
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echo "--- Test run of xorriso program failed: $XORRISO -no_rc -version" 2>&1
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echo "--- Test run of xorriso program failed: $XORRISO -no_rc -version" >&2
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missing=1
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fi
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if test "$missing" = 1
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@ -229,11 +283,13 @@ then
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fi
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existing_tempfiles=
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for i in $TEMPFILE_LIST
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for i in merged_dists merged_md5sum.txt merged_README.txt temp_file
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do
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if test -e "$i"
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then
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existing_tempfiles="$existing_tempfiles $i"
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else
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TEMPFILE_LIST="$TEMPFILE_LIST $i"
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fi
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done
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if test -n "$existing_tempfiles"
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@ -245,8 +301,12 @@ then
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exit 1
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fi
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# +++ From here on: Always call cleanup_and_end to perform exit +++
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trap cleanup_and_end INT TERM QUIT EXIT
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trap cleanup_and_end INT TERM QUIT
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trap cleanup_for_exit EXIT
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RESULT_ISO="$1"
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check_single_word "$2" "result_iso" || cleanup_and_end 1
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@ -683,6 +743,9 @@ else
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fi
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echo >&2
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# Mark the result path for possible removal by cleanup
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EMERGING_ISO="$RESULT_ISO"
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if "$XORRISO" \
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-no_rc \
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-indev "$iso_1" \
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@ -700,6 +763,9 @@ if "$XORRISO" \
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-padding included \
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-compliance no_emul_toc
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then
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# Revoke mark for possible removal by cleanup
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EMERGING_ISO=
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test "$XORRISO" = echo || \
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echo "Run of xorriso program ended without error indication." >&2
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else
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