Php: iconv on Alpine 3.13

[enumag]

Using the PHP alpine images, this code...:

<?php
ini_set('display_errors', '1');
error_reporting(-1);
iconv("UTF-8", "ASCII//TRANSLIT", "foobar");

...causes this error:

iconv(): Wrong charset, conversion from `UTF-8' to `ASCII//TRANSLIT' is not allowed in [...]

This is a long-known issue, however the situation has changed significantly so I think a new issue is appropriate.

Until now the problem was commonly solved by this workaround:

RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/ gnu-libiconv
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so

This however no longer works with gnu-libiconv 1.16-r0 because the preloadable_libiconv.so has been removed (see alpine aports issue and related libiconv commit).

On Alpine 3.12 we can use gnu-libiconv=1.15-r2.

On Alpine 3.13 however the version no longer exists and consequently the workaround is not available.

EDIT: My bad. The version is available in 3.13, just missing in edge.

Is there any other way to fix this? Perhaps somehow using --with-iconv when building PHP? (Not sure, just an idea.)

[khs1994]

RUN apk add --no-cache  gnu-libiconv
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so

[khs1994]

• https://pkgs.alpinelinux.org/contents?branch=v3.13&name=gnu-libiconv&arch=x86_64&repo=community
• https://pkgs.alpinelinux.org/contents?branch=edge&name=gnu-libiconv&arch=x86_64&repo=community

[enumag]

Ah okay so it only doesn't work with edge for now but v3.13 will be fine. Good to know but still it means that the current workaround might not work later.

[greg0ire]

To anyone visiting this issue, the current workaround is

-apk add gnu-libiconv
+apk add gnu-libiconv=1.15-r2

[gouki777]

I looked at the documentation , used 3.12 is good. thanks~

FROM alpine:3.12
RUN     apk update && \
        apk add php7=7.3.27-r0 php7-iconv 
        .............................       
#fix apline-php7-iconv
RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/ gnu-libiconv=1.15-r2
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
cmd["php"]

[litan1106]

my current workaround is the stick with alpine3.13 and gnu-libiconv=1.15-r3

[thekid]

my current workaround is the stick with alpine3.13 and gnu-libiconv=1.15-r3

For easy copy&pasting:

RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/v3.13/community/ gnu-libiconv=1.15-r3

ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php