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Feat: Customize busybox #59

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ef7ff3a
Customize busybox
Meldiron Jan 15, 2026
921b966
Fix build
Meldiron Jan 15, 2026
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21 changes: 21 additions & 0 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,5 +1,25 @@
ARG BASEIMAGE="php:8.4.11-cli-alpine3.22"

# Update max buffer length for /bin/sh, to allow paste larger than 2k characters
FROM $BASEIMAGE AS busybox

ENV BUSYBOX_VERSION="1.36.1" \
MAX_PASTE_LENGTH="65536"

RUN apk add --no-cache busybox-extras build-base openssl-dev gcc perl musl-dev make linux-headers wget

RUN wget https://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2 && \
tar xf busybox-${BUSYBOX_VERSION}.tar.bz2 && \
mv busybox-${BUSYBOX_VERSION} busybox

WORKDIR /busybox

RUN make defconfig && \
sed -i 's/CONFIG_FEATURE_EDITING_MAX_LEN=.*/CONFIG_FEATURE_EDITING_MAX_LEN=8192/' .config && \
yes "" | make oldconfig

RUN make -j$(nproc)

FROM $BASEIMAGE AS compile

ENV PHP_REDIS_VERSION="6.2.0" \
Expand Down Expand Up @@ -210,6 +230,7 @@ RUN \

WORKDIR /usr/src/code

COPY --from=busybox /busybox/busybox /bin/busybox
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@coderabbitai coderabbitai bot Jan 15, 2026

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⚠️ Potential issue | 🟠 Major

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Check what /bin/sh points to in the Alpine base image
docker run --rm php:8.4.11-cli-alpine3.22 ls -la /bin/sh /bin/busybox 2>/dev/null || echo "Could not inspect symlinks"
docker run --rm php:8.4.11-cli-alpine3.22 readlink -f /bin/sh

Repository: appwrite/docker-base

Length of output: 154

🏁 Script executed:

#!/bin/bash
# Explore the Dockerfile context around line 233
head -n 240 Dockerfile | tail -n 20

Repository: appwrite/docker-base

Length of output: 1325

🏁 Script executed:

#!/bin/bash
# Search for any documentation or comments about busybox/sh in the codebase
rg -i "busybox|/bin/sh" --type-list | head -20
rg -i "busybox" . -A 3 -B 3

Repository: appwrite/docker-base

Length of output: 2209

🏁 Script executed:

#!/bin/bash
# Check entire Dockerfile for any sh symlink setup
grep -n "sh\|symlink\|ln -s" Dockerfile

Repository: appwrite/docker-base

Length of output: 229

🌐 Web query:

Alpine Linux busybox /bin/sh symlink default

💡 Result:

By default Alpine links /bin/sh to BusyBox's ash (the BusyBox-provided /bin/ash implementation). You can replace it (e.g. install dash-binsh or bash) if you need a different /bin/sh. [1][2]

Create a symlink from /bin/sh to /bin/busybox after copying the binary.

Alpine defaults to linking /bin/sh to BusyBox's ash. The Dockerfile copies a custom busybox (with CONFIG_FEATURE_EDITING_MAX_LEN=8192) to /bin/busybox, but this won't update /bin/sh unless you explicitly establish the symlink. Add RUN ln -sf /bin/busybox /bin/sh after the COPY statement to ensure the custom binary is actually used for shell operations.

🤖 Prompt for AI Agents 
In `@Dockerfile` at line 233, The Dockerfile copies a custom BusyBox binary with
COPY --from=busybox /busybox/busybox /bin/busybox but does not update the
default shell link, so /bin/sh may still point to the old ash; after that COPY,
create or update the symlink so /bin/sh points to /bin/busybox by running a
command to force-create the symlink (e.g., use ln -sf /bin/busybox /bin/sh) to
ensure the custom BusyBox is used for shell operations.

COPY --from=swoole /usr/local/lib/php/extensions/no-debug-non-zts-20240924/swoole.so /usr/local/lib/php/extensions/no-debug-non-zts-20240924/
COPY --from=redis /usr/local/lib/php/extensions/no-debug-non-zts-20240924/redis.so /usr/local/lib/php/extensions/no-debug-non-zts-20240924/
COPY --from=imagick /usr/local/lib/php/extensions/no-debug-non-zts-20240924/imagick.so /usr/local/lib/php/extensions/no-debug-non-zts-20240924/
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4 changes: 4 additions & 0 deletions tests.yaml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,10 @@
schemaVersion: '2.0.0'

commandTests:
- name: 'Busybox command'
command: "busybox"
args: ["whoami"]
expectedOutput: ["root"]
- name: 'Imagemagick command'
command: "magick"
args: ["--version"]
Expand Down
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