This patch mitigates risk of supply chain attack via tainted source
release packages(e.g. CVE-2024-3094).

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This patch addresses the following Snapcraft linter warning:

```
- library: libopenjp2.so.7: unused library 'usr/lib/x86_64-linux-gnu/libo
penjp2.so.2.4.0'. (https://snapcraft.io/docs/linters-library)
```

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

…a part

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

* Reduce part pull time by limiting the history depth to clone
* Reduce part build time by disable components that we don't need.
* Reduce overall snap size by only shipping files that are needed in
 runtime.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This is the current latest version.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

The application is still runnable due to some of the packages are
already staged by the Leptonica part, however it should still be
declared for clarity.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This change reduces package size by 44%(73637888 -> 40894464).

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Currently this feature isn't exposed to the host, dropping the
dependencies to reduce built package size.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Previously this is implicitly configured as the build dependency isn't
available and the training tools build target isn't called.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

The zlib library is Leptonica's dependency, not Tesseract's.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

These should be Leptonica part's build dependencies.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

… tesseract and leptonica part

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

…ble snap publishing

This scriptlet allows stable builds to be always available for the
downstream snap publisher to promote to the `stable` channel on
the Snap Store.

Higher risk builds(e.g. beta/edge) will only occur when the lower risk
builds(rc/stable) are promoted.

Refer the following Snapcraft Forum topic for more info:

    Selective-checkout: Check out the tagged release revision if it isn't promoted to the stable channel - doc - snapcraft.io
    https://forum.snapcraft.io/t/selective-checkout-check-out-the-tagged-release-revision-if-it-isnt-promoted-to-the-stable-channel/10617

Here's a snippet of the scriptlet in action:

```
:: selective-checkout: INFO: Detecting stable releases...
:: selective-checkout: determine_stable_release_details: DEBUG: Last stable release tag determines to be "5.4.1".
:: selective-checkout: determine_stable_release_details: DEBUG: Last stable version determines to be "5.4.1".
:: selective-checkout: snap_query_version: DEBUG: Checking what snap revisions are available for the tesseract snap at the stable release channel...
:: selective-checkout: determine_stable_release_details: DEBUG: Last stable version on the snap store determines to be "".
:: selective-checkout: INFO: Detecting release candidate releases...
:: selective-checkout: DEBUG: Last release candidate release tag determines to be "5.4.0-rc2".
:: selective-checkout: DEBUG: Last release candidate version determines to be "5.4.0-rc2".
:: selective-checkout: snap_query_version: DEBUG: Checking what snap revisions are available for the tesseract snap at the candidate release channel...
:: selective-checkout: DEBUG: Last release candidate version on the snap store determines to be "".
:: selective-checkout: INFO: Detecting beta releases...
:: selective-checkout: DEBUG: Last beta release tag determines to be "5.0.0-beta-20210916".
:: selective-checkout: DEBUG: Last beta version determines to be "5.0.0-beta-20210916".
:: selective-checkout: snap_query_version: DEBUG: Checking what snap revisions are available for the tesseract snap at the beta release channel...
:: selective-checkout: DEBUG: Last beta version on the snap store determines to be "".
:: selective-checkout: determine_which_version_to_build: DEBUG: Stable version(5.4.1) is newer than the one on the Snap Store(none), stable release will be built.
:: selective-checkout: Info: The last tagged stable release(5.4.1) hasn't been promoted to the stable channel() on the Snap Store yet, checking out 5.4.1.
```

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

Libraries under $SNAP/usr/local/lib isn't searched by the dynamic linker
by default.

Refer-to: Staging - Build and staging dependencies - doc - snapcraft.io <https://forum.snapcraft.io/t/build-and-staging-dependencies/11451>
Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This patch addresses the following linter warnings:

```
- library: libicuio.so.70: unused library 'usr/lib/x86_64-linux-gnu/libicuio.so.70.1'. (https://snapcraft.io/docs/linters-library)
- library: libicutest.so.70: unused library 'usr/lib/x86_64-linux-gnu/libicutest.so.70.1'. (https://snapcraft.io/docs/linters-library)
- library: libicutu.so.70: unused library 'usr/lib/x86_64-linux-gnu/libicutu.so.70.1'. (https://snapcraft.io/docs/linters-library
- library: libicui18n.so.70: unused library 'usr/lib/x86_64-linux-gnu/libicui18n.so.70.1'. (https://snapcraft.io/docs/linters-library)
```

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

…act part

libcurl functionality requires network access.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This patch fixes configuration files in the readonly snap filesystem
not loadable by Tesseract due to missing datadir fallback logic.

If the config file with the same name doesn't appear in the
$SNAP_USER_COMMON directory, the one in the $SNAP/usr/local/share/tessdata
directory will be loaded, allow Tesseract to work properly.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

…t variable

This patch addresses the following Snapcraft linter warnings:

```
CRAFT_ARCH_TRIPLET is deprecated, use CRAFT_ARCH_TRIPLET_BUILD_{ON|FOR}
```

Refer-to: core22 | Parts environment variables | Snapcraft documentation <https://snapcraft.io/docs/parts-environment-variables#heading--snapcraft-configuration-core22>
Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This patch fixes the incorrect compiled-in datadir path and as a
side-effect, simplifies the fallback config loading patch.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>

This patch allows the user to store Tesseract data in custom paths
using the TESSDATA_PREFIX environment variable.

Previously it is hardcoded to $SNAP_USER_COMMON.

Signed-off-by: 林博仁(Buo-ren Lin) <[email protected]>