75 lines
2.1 KiB
Bash
Executable file
75 lines
2.1 KiB
Bash
Executable file
#!/usr/bin/env bash
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dir_newmail="/tmp/maildir/Mail/new";
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target_dir="/mnt/output";
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fetchmail_uid="$(id -u "fetchmail")";
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fetchmail_gid="$(id -g "fetchmail")";
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temp_dir="$(mktemp --tmpdir -d "imap-download-XXXXXXX")";
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on_exit() {
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rm -rf "${temp_dir}";
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}
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trap on_exit EXIT;
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do_fetchmail() {
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log_msg "Starting fetchmail";
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while :; do
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# Ref https://github.com/SinusBot/docker/pull/40
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# WORKAROUND for `setpriv: libcap-ng is too old for "all" caps`, previously "-all" was used here
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# create a list to drop all capabilities supported by current kernel
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cap_prefix="-cap_";
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caps="$cap_prefix$(seq -s ",$cap_prefix" 0 "$(cat /proc/sys/kernel/cap_last_cap)")";
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setpriv --inh-caps="${caps}" --reuid "${fetchmail_uid}" --clear-groups --regid "${fetchmail_gid}" fetchmail --mda "/usr/bin/procmail -m /srv/procmail.conf";
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exit_code="$?";
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if [[ "$exit_code" -eq 127 ]]; then
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log_msg "setpriv failed, exiting with code 127";
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exit 127;
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fi
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log_msg "Fetchmail exited with code ${exit_code}, sleeping 60 seconds";
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sleep 60
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done
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}
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log_msg() {
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echo "$(date -u +"%Y-%m-%d %H:%M:%S") imap-download: $*";
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}
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mkdir -p "${dir_newmail}";
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do_attachments() {
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while :; do # : = infinite loop
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# Wait for an update
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# inotifywait's non-0 exit code forces an exit for some reason :-/
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inotifywait -qr --event create --format '%:e %f' "${dir_newmail}";
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while read -r filename; do
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log_msg "Processing email ${filename}";
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# Move the email to a temporary directory for processing
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mv "${filename}" "${temp_dir}";
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# Unpack the attachments
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munpack -C "${temp_dir}" "${filename}";
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# Delete the original email file and any description files
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rm "${filename}";
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find "${temp_dir}" -iname '*.desc' -delete;
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# Move the attachment files to the output directory
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while read -r attachment; do
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log_msg "Extracted attachment ${attachment}";
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chmod 0775 "${temp_dir}/${attachment}";
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mv "${attachment}" "${target_dir}";
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done < <(find "${temp_dir}" -type f);
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done < <(find "${dir_newmail}" -type f);
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done
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}
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do_fetchmail &
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do_attachments
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