Add a native updatedb.
This incorporates some code from mlocate's updatedb, and thus is compatible
with /etc/updatedb.conf, and supports all the pruning options from it.
All the code has been heavily modified, e.g. the gnulib dependency has been
removed and replaced with STL code (kicking 10k+ lines of code), the bind
mount code has been fixed (it was all broken since the switch from /etc/mtab
to /proc/self/mountinfo) and everything has been reformatted. Like with mlocate,
plocate's updatedb is merging, ie., it can skip readdir() on unchanged
directories. (The logic here is also copied pretty verbatim from mlocate.)
updatedb reads plocate's native format; there's a new max_version 2 that
contains directory timestamps (without it, updatedb will fall back to a full
scan). The timestamps increase the database size by only about 1%, which is a
good tradeoff when we're getting rid of the entire mlocate database.
We liberally use modern features to simplify the implementation; in particular,
openat() to avoid race conditions, instead of mlocate's complicated chdir() dance.
Unfortunately, the combination of the slightly strange storage order from mlocate,
and openat(), means we can need to keep up a bunch of file descriptors open,
but they are not an expensive resource these days, and we try to bump the
limit ourselves if we are allowed to. We also use O_TMPFILE, to make sure we
never leave a half-finished file lying around (mlocate's updatedb tries to
catch signals instead). All of this may hinder portability, so we might ease up
on the requirements later. We don't use io_uring for updatedb at this point.
plocate-build does not write the needed timestamps, so the first upgrade from
mlocate to native plocate requires a full rescan.
NOTE: The format is _not_ frozen yet, and won't be until actual release.
2020-11-21 18:23:20 +01:00
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/* Bind mount detection.
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Copyright (C) 2005, 2007, 2008 Red Hat, Inc. All rights reserved.
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This copyrighted material is made available to anyone wishing to use, modify,
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copy, or redistribute it subject to the terms and conditions of the GNU General
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Public License v.2.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
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Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Author: Miloslav Trmac <mitr@redhat.com>
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plocate modifications: Copyright (C) 2020 Steinar H. Gunderson.
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plocate parts and modifications are licensed under the GPLv2 or, at your option,
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any later version.
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*/
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#ifndef BIND_MOUNT_H__
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#define BIND_MOUNT_H__
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/* System mount information file */
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#define MOUNTINFO_PATH "/proc/self/mountinfo"
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/* Return true if PATH is a destination of a bind mount.
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(Bind mounts "to self" are ignored.) */
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extern bool is_bind_mount(const char *path);
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2024-01-05 08:49:04 +01:00
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/* Initialize state for is_bind_mount(), to read data from MOUNTINFO_PATH. */
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extern void bind_mount_init();
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Add a native updatedb.
This incorporates some code from mlocate's updatedb, and thus is compatible
with /etc/updatedb.conf, and supports all the pruning options from it.
All the code has been heavily modified, e.g. the gnulib dependency has been
removed and replaced with STL code (kicking 10k+ lines of code), the bind
mount code has been fixed (it was all broken since the switch from /etc/mtab
to /proc/self/mountinfo) and everything has been reformatted. Like with mlocate,
plocate's updatedb is merging, ie., it can skip readdir() on unchanged
directories. (The logic here is also copied pretty verbatim from mlocate.)
updatedb reads plocate's native format; there's a new max_version 2 that
contains directory timestamps (without it, updatedb will fall back to a full
scan). The timestamps increase the database size by only about 1%, which is a
good tradeoff when we're getting rid of the entire mlocate database.
We liberally use modern features to simplify the implementation; in particular,
openat() to avoid race conditions, instead of mlocate's complicated chdir() dance.
Unfortunately, the combination of the slightly strange storage order from mlocate,
and openat(), means we can need to keep up a bunch of file descriptors open,
but they are not an expensive resource these days, and we try to bump the
limit ourselves if we are allowed to. We also use O_TMPFILE, to make sure we
never leave a half-finished file lying around (mlocate's updatedb tries to
catch signals instead). All of this may hinder portability, so we might ease up
on the requirements later. We don't use io_uring for updatedb at this point.
plocate-build does not write the needed timestamps, so the first upgrade from
mlocate to native plocate requires a full rescan.
NOTE: The format is _not_ frozen yet, and won't be until actual release.
2020-11-21 18:23:20 +01:00
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#endif
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