My goal is to create an image using the FROM scratch. However, I need pdftotext. Hence, I need to install poppler-utils on FROM alpine:3.16. Then, copy it to FROM scratch stage.
My concern is that:
- someone said that there are layers limit of 42. This reproducible code already uses 22.
What I am thinking to do:
multi-stage build.
FROM alpine:3.16
RUN apk add poppler-utils
FROM scratch
(...tons of COPY --from=0)
FROM scratch
COPY --from=1 . .
- or
RUN --mount
FROM alpine:3.16
RUN apk add poppler-utils
FROM scratch
RUN --mount=src=/,dst=/,from=0 \
(...tons of cp)
This is the current solution that I use.
Dockerfile
FROM alpine:3.16
RUN apk add poppler-utils
FROM scratch
WORKDIR /
COPY --from=0 /lib/ld-musl-aarch64.so.1 /lib/ld-musl-aarch64.so.1
COPY --from=0 /usr/lib/libpoppler.so.121 /usr/lib/libpoppler.so.121
COPY --from=0 /usr/lib/libstdc++.so.6 /usr/lib/libstdc++.so.6
COPY --from=0 /lib/ld-musl-aarch64.so.1 /lib/ld-musl-aarch64.so.1
COPY --from=0 /usr/lib/libfreetype.so.6 /usr/lib/libfreetype.so.6
COPY --from=0 /usr/lib/libfontconfig.so.1 /usr/lib/libfontconfig.so.1
COPY --from=0 /usr/lib/libjpeg.so.8 /usr/lib/libjpeg.so.8
COPY --from=0 /lib/libz.so.1 /lib/libz.so.1
COPY --from=0 /usr/lib/libopenjp2.so.7 /usr/lib/libopenjp2.so.7
COPY --from=0 /usr/lib/liblcms2.so.2 /usr/lib/liblcms2.so.2
COPY --from=0 /usr/lib/libpng16.so.16 /usr/lib/libpng16.so.16
COPY --from=0 /usr/lib/libtiff.so.5 /usr/lib/libtiff.so.5
COPY --from=0 /usr/lib/libgcc_s.so.1 /usr/lib/libgcc_s.so.1
COPY --from=0 /usr/lib/libbz2.so.1 /usr/lib/libbz2.so.1
COPY --from=0 /usr/lib/libbrotlidec.so.1 /usr/lib/libbrotlidec.so.1
COPY --from=0 /usr/lib/libexpat.so.1 /usr/lib/libexpat.so.1
COPY --from=0 /usr/lib/libwebp.so.7 /usr/lib/libwebp.so.7
COPY --from=0 /usr/lib/libzstd.so.1 /usr/lib/libzstd.so.1
COPY --from=0 /usr/lib/liblzma.so.5 /usr/lib/liblzma.so.5
COPY --from=0 /usr/lib/libbrotlicommon.so.1 /usr/lib/libbrotlicommon.so.1
COPY --from=0 /usr/bin/pdftotext /usr/bin/pdftotext
Output from $ docker build -t test .
[+] Building 0.5s (27/27) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 2.04kB 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/alpine:3.16 0.0s
=> [stage-0 1/2] FROM docker.io/library/alpine:3.16 0.0s
=> CACHED [stage-0 2/2] RUN apk add poppler-utils 0.0s
=> [stage-1 1/22] COPY --from=0 /lib/ld-musl-aarch64.so.1 /lib/ld 0.0s
=> [stage-1 2/22] COPY --from=0 /usr/lib/libpoppler.so.121 /usr/l 0.0s
=> [stage-1 3/22] COPY --from=0 /usr/lib/libstdc++.so.6 /usr/lib/ 0.0s
=> [stage-1 4/22] COPY --from=0 /lib/ld-musl-aarch64.so.1 /lib/ld 0.0s
=> [stage-1 5/22] COPY --from=0 /usr/lib/libfreetype.so.6 /usr/li 0.0s
=> [stage-1 6/22] COPY --from=0 /usr/lib/libfontconfig.so.1 /usr/ 0.0s
=> [stage-1 7/22] COPY --from=0 /usr/lib/libjpeg.so.8 /usr/lib/li 0.0s
=> [stage-1 8/22] COPY --from=0 /lib/libz.so.1 /lib/libz.so.1 0.0s
=> [stage-1 9/22] COPY --from=0 /usr/lib/libopenjp2.so.7 /usr/lib 0.0s
=> [stage-1 10/22] COPY --from=0 /usr/lib/liblcms2.so.2 /usr/lib/l 0.0s
=> [stage-1 11/22] COPY --from=0 /usr/lib/libpng16.so.16 /usr/lib/ 0.0s
=> [stage-1 12/22] COPY --from=0 /usr/lib/libtiff.so.5 /usr/lib/li 0.0s
=> [stage-1 13/22] COPY --from=0 /usr/lib/libgcc_s.so.1 /usr/lib/l 0.0s
=> [stage-1 14/22] COPY --from=0 /usr/lib/libbz2.so.1 /usr/lib/lib 0.0s
=> [stage-1 15/22] COPY --from=0 /usr/lib/libbrotlidec.so.1 /usr/l 0.0s
=> [stage-1 16/22] COPY --from=0 /usr/lib/libexpat.so.1 /usr/lib/l 0.0s
=> [stage-1 17/22] COPY --from=0 /usr/lib/libwebp.so.7 /usr/lib/li 0.0s
=> [stage-1 18/22] COPY --from=0 /usr/lib/libzstd.so.1 /usr/lib/li 0.0s
=> [stage-1 19/22] COPY --from=0 /usr/lib/liblzma.so.5 /usr/lib/li 0.0s
=> [stage-1 20/22] COPY --from=0 /usr/lib/libbrotlicommon.so.1 /us 0.0s
=> [stage-1 21/22] COPY --from=0 /usr/bin/pdftotext /usr/bin/pdftotext 0.0s
=> exporting to image 0.1s
=> => exporting layers 0.1s
=> => writing image sha256:e427868094aba36fafea50aeca50bad9b70315c651914 0.0s
=> => naming to docker.io/library/test 0.0s