90 lines
2.8 KiB
Nix
90 lines
2.8 KiB
Nix
{ runCommand, lib, stdenv, storeDir ? builtins.storeDir, writeScript
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, singularity, writeClosure, bash, vmTools, gawk, util-linux, runtimeShell
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, e2fsprogs }: rec {
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shellScript = name: text:
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writeScript name ''
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#!${runtimeShell}
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set -e
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${text}
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'';
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mkLayer = { name, contents ? [ ]
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# May be "apptainer" instead of "singularity"
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, projectName ? (singularity.projectName or "singularity") }:
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runCommand "${projectName}-layer-${name}" { inherit contents; } ''
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mkdir $out
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for f in $contents ; do
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cp -ra $f $out/
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done
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'';
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buildImage = let defaultSingularity = singularity;
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in { name, contents ? [ ], diskSize ? 1024, runScript ? ''
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#!${stdenv.shell}
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exec /bin/sh'', runAsRoot ? null, memSize ? 512
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, singularity ? defaultSingularity }:
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let
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projectName = singularity.projectName or "singularity";
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runAsRootFile = shellScript "run-as-root.sh" runAsRoot;
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runScriptFile = shellScript "run-script.sh" runScript;
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result = vmTools.runInLinuxVM
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(runCommand "${projectName}-image-${name}.img" {
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buildInputs = [ singularity e2fsprogs util-linux gawk ];
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layerClosure = writeClosure contents;
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preVM = vmTools.createEmptyImage {
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size = diskSize;
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fullName = "${projectName}-run-disk";
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};
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inherit memSize;
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} ''
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rm -rf $out
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mkdir disk
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mkfs -t ext3 -b 4096 /dev/${vmTools.hd}
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mount /dev/${vmTools.hd} disk
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mkdir -p disk/img
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cd disk/img
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mkdir proc sys dev
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# Run root script
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${lib.optionalString (runAsRoot != null) ''
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mkdir -p ./${storeDir}
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mount --rbind ${storeDir} ./${storeDir}
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unshare -imnpuf --mount-proc chroot ./ ${runAsRootFile}
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umount -R ./${storeDir}
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''}
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# Build /bin and copy across closure
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mkdir -p bin ./${builtins.storeDir}
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for f in $(cat $layerClosure) ; do
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cp -ar $f ./$f
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done
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for c in ${toString contents} ; do
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for f in $c/bin/* ; do
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if [ ! -e bin/$(basename $f) ] ; then
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ln -s $f bin/
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fi
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done
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done
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# Create runScript and link shell
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if [ ! -e bin/sh ]; then
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ln -s ${runtimeShell} bin/sh
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fi
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mkdir -p .${projectName}.d
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ln -s ${runScriptFile} .${projectName}.d/runscript
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# Fill out .${projectName}.d
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mkdir -p .${projectName}.d/env
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touch .${projectName}.d/env/94-appsbase.sh
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cd ..
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mkdir -p /var/lib/${projectName}/mnt/session
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echo "root:x:0:0:System administrator:/root:/bin/sh" > /etc/passwd
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echo > /etc/resolv.conf
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TMPDIR=$(pwd -P) ${projectName} build $out ./img
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'');
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in result;
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}
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