Debootstrap.built now supports bootstrapping chroots for foreign OS's

This commit was sponsored by Ethan Aubin.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/Propellor/Property/Qemu.hs b/src/Propellor/Property/Qemu.hs
new file mode 100644
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+++ b/src/Propellor/Property/Qemu.hs
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+module Propellor.Property.Qemu where
+
+import Propellor.Base
+import qualified Propellor.Property.Apt as Apt
+
+-- | Installs qemu user mode emulation binaries, built statically,
+-- which allow foreign binaries to run directly.
+foreignBinariesEmulated :: RevertableProperty Linux Linux
+foreignBinariesEmulated = (setup <!> cleanup)
+	`describe` "foreign binary emulation"
+  where
+	setup = Apt.installed p `pickOS` unsupportedOS
+	cleanup = Apt.removed p `pickOS` unsupportedOS
+	p = ["qemu-user-static"]
+
+-- | Removes qemu user mode emulation binary for the host CPU.
+-- This binary is copied into a chroot by qemu-debootstrap, and is not
+-- part of any package.
+--
+-- Note that removing the binary will prevent using the chroot on the host
+-- system.
+removeHostEmulationBinary :: Property DebianLike
+removeHostEmulationBinary = tightenTargets $ 
+	scriptProperty ["rm -f /usr/bin/qemu-*-static"]
+		`assume` MadeChange
+
+-- | Check if the given System supports an Architecture.
+--
+-- For example, on Debian, X86_64 supports X86_32, and vice-versa.
+supportsArch :: System -> Architecture -> Bool
+supportsArch (System os a) b
+	| a == b = True
+	| otherwise = case os of
+		Debian _ _ -> debianlike
+		Buntish _ -> debianlike
+		-- don't know about other OS's
+		_ -> False
+  where
+	debianlike =
+		let l = 
+			[ (X86_64, X86_32)
+			, (ARMHF, ARMEL)
+			, (PPC, PPC64)
+			, (SPARC, SPARC64)
+			, (S390, S390X)
+			]
+		in elem (a, b) l || elem (b, a) l