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Whenever we create scripts that are installed to $out, we must use runtimeShell in order to get the shell that can be executed on the machine we create the package for. This is relevant for cross-compiling. The only use case for stdenv.shell are scripts that are executed as part of the build system. Usages in checkPhase are borderline however to decrease the likelyhood of people copying the wrong examples, I decided to use runtimeShell as well.
103 lines
2.6 KiB
Nix
103 lines
2.6 KiB
Nix
{ runCommand
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, stdenv
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, storeDir ? builtins.storeDir
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, writeScript
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, singularity
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, writeReferencesToFile
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, bash
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, vmTools
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, gawk
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, utillinux
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, runtimeShell
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, e2fsprogs }:
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rec {
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shellScript = name: text:
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writeScript name ''
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#!${runtimeShell}
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set -e
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${text}
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'';
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mkLayer = {
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name,
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contents ? [],
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}:
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runCommand "singularity-layer-${name}" {
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inherit contents;
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} ''
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mkdir $out
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for f in $contents ; do
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cp -ra $f $out/
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done
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'';
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buildImage = {
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name,
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contents ? [],
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diskSize ? 1024,
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runScript ? "#!${stdenv.shell}\nexec /bin/sh",
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runAsRoot ? null,
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extraSpace ? 0
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}:
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let layer = mkLayer {
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inherit name;
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contents = contents ++ [ bash runScriptFile ];
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};
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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 "singularity-image-${name}.img" {
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buildInputs = [ singularity e2fsprogs utillinux gawk ];
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layerClosure = writeReferencesToFile layer;
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preVM = vmTools.createEmptyImage {
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size = diskSize;
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fullName = "singularity-run-disk";
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};
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}
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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/${vmTools.hd} disk
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cd disk
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mkdir proc sys dev
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# Run root script
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${stdenv.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 nix/store
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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
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ln -s ${runScriptFile} singularity
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# Fill out .singularity.d
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mkdir -p .singularity.d/env
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touch .singularity.d/env/94-appsbase.sh
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cd ..
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mkdir -p /var/singularity/mnt/{container,final,overlay,session,source}
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echo "root:x:0:0:System administrator:/root:/bin/sh" > /etc/passwd
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singularity build $out ./disk
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'');
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in result;
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}
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