#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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import os
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def sort_file(filename, mapping):
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"""
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Sorts a passwd or group file based on the numeric ID in the third column.
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If a mapping is given, the name from the first column is mapped via that
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dictionary instead (necessary for /etc/shadow and /etc/gshadow). If not,
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a new mapping is created on the fly and returned.
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"""
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new_mapping = {}
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with open(filename, 'rb+') as f:
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lines = f.readlines()
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# No explicit error checking for the sake of simplicity. /etc
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# files are assumed to be well-formed, causing exceptions if
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# not.
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for line in lines:
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entries = line.split(b':')
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name = entries[0]
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if mapping is None:
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id = int(entries[2])
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else:
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id = mapping[name]
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new_mapping[name] = id
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# Sort by numeric id first, with entire line as secondary key
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# (just in case that there is more than one entry for the same id).
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lines.sort(key=lambda line: (new_mapping[line.split(b':')[0]], line))
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# We overwrite the entire file, i.e. no truncate() necessary.
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f.seek(0)
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f.write(b''.join(lines))
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return new_mapping
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def remove_backup(filename):
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"""
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Removes the backup file for files like /etc/passwd.
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"""
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backup_filename = filename + '-'
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if os.path.exists(backup_filename):
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os.unlink(backup_filename)
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def sort_passwd(sysconfdir):
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"""
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Sorts passwd and group files in a rootfs /etc directory by ID.
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Backup files are sometimes are inconsistent and then cannot be
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sorted (YOCTO #11043), and more importantly, are not needed in
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the initial rootfs, so they get deleted.
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"""
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for main, shadow in (('passwd', 'shadow'),
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('group', 'gshadow')):
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filename = os.path.join(sysconfdir, main)
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remove_backup(filename)
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if os.path.exists(filename):
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mapping = sort_file(filename, None)
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filename = os.path.join(sysconfdir, shadow)
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remove_backup(filename)
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if os.path.exists(filename):
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sort_file(filename, mapping)
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