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Clarify README for CLI options.
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@rnc
rnc committed Oct 31, 2022
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Expand Up @@ -62,10 +62,14 @@ Usage
--version Show version and exit
-d, --development Does not clean up after failure for easier debugging
-f FROM_LAYER, --from-layer FROM_LAYER
ID of the layer or image ID or image name. If not
specified will squash all layers in the image
-t TAG, --tag TAG Specify the tag to be used for the new image. By
default it'll be set to 'image' argument
Number of layers to squash or ID of the layer (or image ID or image name) to squash from.
In case the provided value is an integer, specified number of layers will be squashed.
Every layer in the image will be squashed if the parameter is not provided.
-t TAG, --tag TAG Specify the tag to be used for the new image. If not
specified no tag will be applied
-m MESSAGE, --message MESSAGE
Specify a commit message (comment) for the new image.
-c, --cleanup Remove source image from Docker after squashing
--tmp-dir TMP_DIR Temporary directory to be created and used
--output-path OUTPUT_PATH
Path where the image should be stored after squashing.
Expand All @@ -86,26 +90,26 @@ We start with image like this:

$ docker history jboss/wildfly:latest
IMAGE CREATED CREATED BY SIZE COMMENT
25954e6d2300 3 weeks ago /bin/sh -c #(nop) CMD ["/opt/jboss/wildfly/bi 0 B
5ae69cb454a5 3 weeks ago /bin/sh -c #(nop) EXPOSE 8080/tcp 0 B
dc24712f35c4 3 weeks ago /bin/sh -c #(nop) ENV LAUNCH_JBOSS_IN_BACKGRO 0 B
d929129d4c8e 3 weeks ago /bin/sh -c cd $HOME && curl -O https://do 160.8 MB
b8fa3caf7d6d 3 weeks ago /bin/sh -c #(nop) ENV JBOSS_HOME=/opt/jboss/w 0 B
38b8f85e74bf 3 weeks ago /bin/sh -c #(nop) ENV WILDFLY_SHA1=c0dd7552c5 0 B
ae79b646b9a9 3 weeks ago /bin/sh -c #(nop) ENV WILDFLY_VERSION=10.0.0. 0 B
2b4606dc9dc7 3 weeks ago /bin/sh -c #(nop) ENV JAVA_HOME=/usr/lib/jvm/ 0 B
118fa9e33576 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5f7e8f36c3bb 3 weeks ago /bin/sh -c yum -y install java-1.8.0-openjdk- 197.4 MB
3d4d0228f161 3 weeks ago /bin/sh -c #(nop) USER [root] 0 B
f7ab4ea19708 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4bb15f3b6977 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5dc1e49f4361 3 weeks ago /bin/sh -c #(nop) WORKDIR /opt/jboss 0 B
7f0f9eb31174 3 weeks ago /bin/sh -c groupadd -r jboss -g 1000 && usera 4.349 kB
bd515f044af7 3 weeks ago /bin/sh -c yum update -y && yum -y install xm 25.18 MB
b78336099045 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4816a298548c 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
6ee235cf4473 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
474c2ee77fa3 3 weeks ago /bin/sh -c #(nop) ADD file:72852fc7626d233343 196.6 MB
25954e6d2300 3 weeks ago /bin/sh -c #(nop) CMD ["/opt/jboss/wildfly/bi 0 B
5ae69cb454a5 3 weeks ago /bin/sh -c #(nop) EXPOSE 8080/tcp 0 B
dc24712f35c4 3 weeks ago /bin/sh -c #(nop) ENV LAUNCH_JBOSS_IN_BACKGRO 0 B
d929129d4c8e 3 weeks ago /bin/sh -c cd $HOME && curl -O https://do 160.8 MB
b8fa3caf7d6d 3 weeks ago /bin/sh -c #(nop) ENV JBOSS_HOME=/opt/jboss/w 0 B
38b8f85e74bf 3 weeks ago /bin/sh -c #(nop) ENV WILDFLY_SHA1=c0dd7552c5 0 B
ae79b646b9a9 3 weeks ago /bin/sh -c #(nop) ENV WILDFLY_VERSION=10.0.0. 0 B
2b4606dc9dc7 3 weeks ago /bin/sh -c #(nop) ENV JAVA_HOME=/usr/lib/jvm/ 0 B
118fa9e33576 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5f7e8f36c3bb 3 weeks ago /bin/sh -c yum -y install java-1.8.0-openjdk- 197.4 MB
3d4d0228f161 3 weeks ago /bin/sh -c #(nop) USER [root] 0 B
f7ab4ea19708 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4bb15f3b6977 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5dc1e49f4361 3 weeks ago /bin/sh -c #(nop) WORKDIR /opt/jboss 0 B
7f0f9eb31174 3 weeks ago /bin/sh -c groupadd -r jboss -g 1000 && usera 4.349 kB
bd515f044af7 3 weeks ago /bin/sh -c yum update -y && yum -y install xm 25.18 MB
b78336099045 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4816a298548c 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
6ee235cf4473 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
474c2ee77fa3 3 weeks ago /bin/sh -c #(nop) ADD file:72852fc7626d233343 196.6 MB
1544084fad81 6 months ago /bin/sh -c #(nop) MAINTAINER The CentOS Proje 0 B

And we want to squash all the layers down to layer ``4bb15f3b6977``.
Expand Down Expand Up @@ -147,15 +151,15 @@ We can now confirm the layer structure:

$ docker history jboss/wildfly:squashed
IMAGE CREATED CREATED BY SIZE COMMENT
52255e75d3eb 40 seconds ago 358.2 MB
4bb15f3b6977 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5dc1e49f4361 3 weeks ago /bin/sh -c #(nop) WORKDIR /opt/jboss 0 B
7f0f9eb31174 3 weeks ago /bin/sh -c groupadd -r jboss -g 1000 && usera 4.349 kB
bd515f044af7 3 weeks ago /bin/sh -c yum update -y && yum -y install xm 25.18 MB
b78336099045 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4816a298548c 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
6ee235cf4473 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
474c2ee77fa3 3 weeks ago /bin/sh -c #(nop) ADD file:72852fc7626d233343 196.6 MB
52255e75d3eb 40 seconds ago 358.2 MB
4bb15f3b6977 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5dc1e49f4361 3 weeks ago /bin/sh -c #(nop) WORKDIR /opt/jboss 0 B
7f0f9eb31174 3 weeks ago /bin/sh -c groupadd -r jboss -g 1000 && usera 4.349 kB
bd515f044af7 3 weeks ago /bin/sh -c yum update -y && yum -y install xm 25.18 MB
b78336099045 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4816a298548c 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
6ee235cf4473 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
474c2ee77fa3 3 weeks ago /bin/sh -c #(nop) ADD file:72852fc7626d233343 196.6 MB
1544084fad81 6 months ago /bin/sh -c #(nop) MAINTAINER The CentOS Proje 0 B

Other option is to specify how many layers (counting from the newest layer) we want to squash.\
Expand Down Expand Up @@ -196,16 +200,16 @@ Let's confirm the image structure now:

$ docker history jboss/wildfly:squashed
IMAGE CREATED CREATED BY SIZE COMMENT
fde7edd2e568 32 seconds ago 358.2 MB
3d4d0228f161 3 weeks ago /bin/sh -c #(nop) USER [root] 0 B
f7ab4ea19708 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4bb15f3b6977 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5dc1e49f4361 3 weeks ago /bin/sh -c #(nop) WORKDIR /opt/jboss 0 B
7f0f9eb31174 3 weeks ago /bin/sh -c groupadd -r jboss -g 1000 && usera 4.349 kB
bd515f044af7 3 weeks ago /bin/sh -c yum update -y && yum -y install xm 25.18 MB
b78336099045 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4816a298548c 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
6ee235cf4473 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
474c2ee77fa3 3 weeks ago /bin/sh -c #(nop) ADD file:72852fc7626d233343 196.6 MB
fde7edd2e568 32 seconds ago 358.2 MB
3d4d0228f161 3 weeks ago /bin/sh -c #(nop) USER [root] 0 B
f7ab4ea19708 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4bb15f3b6977 3 weeks ago /bin/sh -c #(nop) USER [jboss] 0 B
5dc1e49f4361 3 weeks ago /bin/sh -c #(nop) WORKDIR /opt/jboss 0 B
7f0f9eb31174 3 weeks ago /bin/sh -c groupadd -r jboss -g 1000 && usera 4.349 kB
bd515f044af7 3 weeks ago /bin/sh -c yum update -y && yum -y install xm 25.18 MB
b78336099045 3 weeks ago /bin/sh -c #(nop) MAINTAINER Marek Goldmann < 0 B
4816a298548c 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
6ee235cf4473 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
474c2ee77fa3 3 weeks ago /bin/sh -c #(nop) ADD file:72852fc7626d233343 196.6 MB
1544084fad81 6 months ago /bin/sh -c #(nop) MAINTAINER The CentOS Proje 0 B

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