fix(calibre-web): make kepubify executable so Kobo sync can be enabled

The LinuxServer base image installs kepubify with `curl -o /usr/bin/kepubify`
and never marks it executable, so the file ships as mode 0644. Calibre-web's
resolve_binary_path() only accepts a binary that passes os.access(X_OK), so
enabling Kobo sync failed with "Kepubify binary not found" even when the path
was set to /usr/bin by hand. Verified against the published layer of
lscr.io/linuxserver/calibre-web:arm64v8-latest, whose tar header for
usr/bin/kepubify reads `-rw-r--r-- 0/0 3670016`.

Set mode 0755 on it at build time, unguarded: if a future base image stops
shipping the binary, the build should fail rather than ship a broken add-on.

Calibre-web separately only autodetects kepubify under /opt/kepubify, never
/usr/bin, so the setting was stored empty on the first start and never
retried. Fill it in with /usr/bin from the cont-init script that already
applies conditional settings to app.db, and only while it is still empty, so
a path the user set by hand is never overwritten.

Fixes https://github.com/alexbelgium/hassio-addons/issues/3040

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

calibre_web/CHANGELOG.md

@@ -1,4 +1,8 @@
  
+## 0.6.27.4 (2026-09-03)
+- Fix: Kobo sync could not be enabled, failing with "Kepubify binary not found" even when the path was set to `/usr/bin` by hand. The LinuxServer base image downloads `/usr/bin/kepubify` with `curl -o` and never marks it executable (mode 0644), and calibre-web only accepts a binary that passes `os.access(X_OK)`. The addon now sets mode 0755 on it at build time (https://github.com/alexbelgium/hassio-addons/issues/3040)
+- Fix: calibre-web only looks for kepubify under `/opt/kepubify`, never `/usr/bin` where the base image puts it, so the kepubify path was stored empty on the first start and never retried. The addon now fills it in with `/usr/bin` when it is still empty, leaving a path set by hand untouched. On a brand new install `/config/app.db` does not exist yet during the first start, so the path is filled in on the second start, as is already the case for the ingress settings
+
 ## 0.6.27.3 (2026-08-30)
 - Doc: explain in the README that Calibre-Web's optional extras (metadata, kobo, gdrive, gmail, goodreads, ldap, oauth, comics) are already installed by the LinuxServer base image, that `pip install calibreweb[...]` inside the container is useless and not persistent, and that the cover fields on the Edit Metadata page are gated on `Enable Uploads` plus the user's `Upload` permission (https://github.com/alexbelgium/hassio-addons/issues/1143)
 - Fix: remove the Dockerfile step that claimed to install the Calibre binaries into `/opt/calibre`. There is no `wget` in the image, so the command failed silently and left the layer empty; the binaries are and were provided at start by the default `linuxserver/mods:universal-calibre` docker mod

calibre_web/Dockerfile

@@ -45,8 +45,13 @@ ARG CONFIGLOCATION="/config"
 RUN chmod 744 /ha_lsio.sh && if grep -qr "lsio" /etc; then /ha_lsio.sh "$CONFIGLOCATION"; fi && rm /ha_lsio.sh
 
 # Specific images modifications
+# The base image installs kepubify with "curl -o /usr/bin/kepubify" and never marks it executable,
+# so calibre-web's resolve_binary_path() rejects it (it requires os.access(X_OK)) and enabling
+# Kobo sync fails with "Kepubify binary not found". Unguarded on purpose: if a future base image
+# stops shipping the binary, the build must fail here rather than ship a silently broken add-on.
 RUN \
-    usermod --home /config abc
+    usermod --home /config abc \
+    && chmod 0755 /usr/bin/kepubify
 
 ##################
 # 3 Install apps #

calibre_web/config.yaml

@@ -116,5 +116,5 @@ schema:
 slug: calibre-web
 udev: true
 url: https://github.com/alexbelgium/hassio-addons/tree/master/calibre_web
-version: "0.6.27.3"
+version: "0.6.27.4"
 video: true

calibre_web/rootfs/etc/cont-init.d/80-configuration.sh

@@ -32,6 +32,13 @@ else
     # before calibre-web, so a failure here is not fatal : the next start applies it.
     trusted_ips_error=$(sqlite3 /config/app.db "update settings set config_reverse_proxy_trusted_ips='127.0.0.1,::1,::ffff:127.0.0.1,172.30.32.0/23,::ffff:172.30.32.0/119,'||coalesce(config_reverse_proxy_trusted_ips,'') where coalesce(config_reverse_proxy_trusted_ips,'') not like '%::ffff:172.30.32.0/119%'" 2>&1) ||
         bashio::log.warning "Could not set the ingress trusted ip list, it will be applied at next start (${trusted_ips_error})"
+
+    # Calibre-web only autodetects kepubify under /opt/kepubify, never /usr/bin where the base
+    # image puts it, so the setting is stored empty on the very first start and is never retried
+    # afterwards : every install ends up with an empty path and Kobo sync cannot be enabled.
+    # Filled in only when it is still empty, so a path the user set by hand is never overwritten.
+    kepubify_error=$(sqlite3 /config/app.db "update settings set config_kepubifypath='/usr/bin' where coalesce(config_kepubifypath,'') = ''" 2>&1) ||
+        bashio::log.warning "Could not set the kepubify path, it will be applied at next start (${kepubify_error})"
 fi
 
 bashio::log.info "Default username:password is admin:admin123"