forked from Mirror/pmbootstrap
68e1feef17
Overview: In order to execute foreign arch binaries on the host system, we are using the Linux kernel's binfmt_misc feature in combination with static builds of QEMU. Before this patch, the statically compiled QEMU binaries were taken from Debian (mostly because I did not realize that Alpine ships them as well). Now we can use the ones from the aport. Benefits: This allows us to easily update and patch the QEMU executables, we don't need to be in sync with Debian's versions anymore. Alpine's package is more modular, so we can save some download, install, zap time, as well as disk space: setting up an armhf chroot with pmbootstrap took ~102 MB before, now it's ~18 MB. Detailed changes: * Remove `cross/qemu-user-static-repack` aport * Add `data/qemu-user-binfmt.txt` with the binfmt_misc flags for ELF binaries of various arches (extracted from Debian's packaging) * When parsing that file, don't write verbose messages to `pmbootstrap log` anymore, only to the verbose log (can be enabled with `pmbootstrap -v`) * Rename `pmb.parse.arch.alpine_to_debian()` to ...`alpine_to_qemu()` * Rename `arch_debian` to `arch_qemu`
49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
"""
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Copyright 2018 Oliver Smith
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This file is part of pmbootstrap.
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pmbootstrap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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pmbootstrap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with pmbootstrap. If not, see <http://www.gnu.org/licenses/>.
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"""
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import logging
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import pmb.config
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# Get magic and mask from binfmt info file
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# Return: {magic: ..., mask: ...}
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def binfmt_info(args, arch_qemu):
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# Parse the info file
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full = {}
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info = pmb.config.pmb_src + "/data/qemu-user-binfmt.txt"
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logging.verbose("parsing: " + info)
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with open(info, "r") as handle:
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for line in handle:
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if line.startswith('#') or "=" not in line:
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continue
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splitted = line.split("=")
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key = splitted[0].strip()
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value = splitted[1]
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full[key] = value[1:-2]
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ret = {}
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logging.verbose("filtering by architecture: " + arch_qemu)
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for type in ["mask", "magic"]:
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key = arch_qemu + "_" + type
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if key not in full:
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raise RuntimeError("Could not find key " + key + " in binfmt info file: " +
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info)
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ret[type] = full[key]
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logging.verbose("=> " + str(ret))
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return ret
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