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Date: Thu, 24 Feb 2022 08:32:55 -0800
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From: Dan Harkless <cygwin-list21 AT harkless DOT org>
Subject: Patches to findutils 4.9.0-1's updatedb to do locking, allow
 filenames with spaces & progress monitoring, exclude /dev on Cygwin, etc.
To: bug-findutils AT gnu DOT org, cygwin AT cygwin DOT com
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Howdy.=C2=A0 I posted last August to the Cygwin list about some problems =
I=20
was having with the updatedb script, including that it was taking more=20
than 24 hours to complete, and then colliding with the next cron run,=20
and that I had no way to monitor progress (short of using Sysinternals=20
Process Explorer's very awkward GUI for this).

I'm finally getting around to sending in a patch (to bug-findutils and=20
the Cygwin list, to which I'm currently subscribed) to address these=20
issues, along with some others, a few of which represent small changes=20
in behavior:

1. Changed the direct 'find' -> 'sort' pipelining of the file list to=20
instead go to a temporary file first (and then a second one, when=20
sorting).=C2=A0 This allows monitoring of progress with 'tail -f'.

2. By default, these .txt and .txt.sort files get deleted on exit (or=20
fatal signal), but I've added a --keeptext option which can be set to=20
'sort' or 'both' to preserve them, either for debugging purposes, or for=20
running special-purpose text-munging/matching scripts on.

3. The script now does locking, outputting its PID to (by default)=20
/var/locatedb.running_updatedb_pid (I was first just going to just call=20
it locatedb.lock, but I decided to be more user-friendly).=C2=A0 If that =
file=20
exists when another instance starts to run, the script will abort with=20
an error.

4. Improved signal-handling, catching more fatal signals.=C2=A0 I also=20
changed SIGHUP to not be treated as fatal, in line with most programs.

5. /dev was not being excluded by default on Cygwin, since there we=20
can't recognize it by filesystem type.=C2=A0 This was causing some=20
time-consuming looping problems for me, with falsely self-nested paths.

6. I tried a whole bunch of different quoting variations, but I couldn't=20
get --prunepaths to work with paths containing spaces (which are of=20
course very common on Windows).=C2=A0 The PRUNEREGEX would always end up=20
incorrectly splitting on the spaces.=C2=A0 I tried to improve the regexp =
to=20
treat '\ ' differently than ' ', but I couldn't get it to work (I'm more=20
expert with Perl regexps than POSIX ones).=C2=A0 In the end, I used a=20
not-TOO-ugly kludge: in the first sed -e expression, I change '\ ' to=20
'///', and then in the last one I change '///' back to ' ' (the=20
backslash isn't needed in the regexp).=C2=A0 Of course '///' should never=
=20
appear in a path; I didn't use simply '//' because it's a relatively=20
common artifact of path concatenation.

7. make_tempdir() wasn't being used in the current version of findutils,=20
so I removed it.

8. Previously, the only protection the script did of the prior version=20
of the database was to write to locatedb.n, and then overwrite locatedb=20
with it at the end.=C2=A0 This was a problem for me when trying to debug =
the=20
updatedb issues I was having, since, for instance, if you killed the=20
'find', it'd still overwrite the old DB with a partial file list.=C2=A0 T=
he=20
script now saves the previous version of the DB as locatedb.prev.=C2=A0 T=
his=20
is also quite handy when a file you expect to be able to find goes=20
missing, in case it disappeared since the last updatedb run.=C2=A0 (I did=
n't=20
address the underlying problem of the script not aborting if 'find' did;=20
the bizarre 4-way 'find' construction with file redirection from the=20
middle of the if {} is unlike anything I've seen in a shell script before=
.)

9. I also made some minor changes, including not outputting the full=20
script path on errors, standardizing error formatting, putting quotes=20
around arguments in errors, and various cleanups and comment improvements=
.

10. The most significant of the minor changes I made was standardizing=20
the indentation, which was all over the place, making it difficult to=20
understand some of the code while debugging. Because of that, in=20
addition to the attached 'diff -u' patch, here's the output of 'diff=20
-uw' to make it easier to review my changes.=C2=A0 My Linux systems use a=
=20
different version of locate, thus I didn't test there, but I think I=20
remained platform-agnostic (and also didn't write any code that wouldn't=20
work under Bourne/POSIX shell).=C2=A0 BTW, I assign my copyright to GNU (=
I=20
filled out the official form some years ago when I was co-maintainer of=20
Wget), and if you feel my self-credit in the author list comment is=20
unwarranted, of course feel free to get rid of it.

Here's that 'diff -uw' output (again, 'diff -u' patch attached):
--- updatedb.orig=C2=A0=C2=A0=C2=A0 2022-02-05 09:37:55.000000000 -0800
+++ updatedb=C2=A0=C2=A0=C2=A0 2022-02-24 03:27:10.749175300 -0800
@@ -15,13 +15,20 @@
 =C2=A0# You should have received a copy of the GNU General Public Licens=
e
 =C2=A0# along with this program.=C2=A0 If not, see <https://www.gnu.org/=
licenses/>.

-# csh original by James Woods; sh conversion by David MacKenzie.
+# csh original by James Woods; sh conversion by David MacKenzie;
+# cleanup and enhancements by Dan Harkless.

 =C2=A0#exec 2> /tmp/updatedb-trace.txt
 =C2=A0#set -x

+ourname=3D`basename $0`=C2=A0 # don't verbosely report path to the scrip=
t in=20
errors
+
+stderr() {
+=C2=A0=C2=A0=C2=A0 echo "$ourname: $*" >&2
+}
+
 =C2=A0version=3D'
-updatedb (GNU findutils) 4.9.0
+updatedb (GNU findutils) 4.9.0+patches
 =C2=A0Copyright (C) 1994-2022 Free Software Foundation, Inc.
 =C2=A0License GPLv3+: GNU GPL version 3 or later=20
<https://gnu.org/licenses/gpl.html>
 =C2=A0This is free software: you are free to change and redistribute it.
@@ -47,11 +54,12 @@
 =C2=A0# (correctly) points to https://www.gnu.org/software/findutils/ in=
stead
 =C2=A0# of the bug reporting page.
 =C2=A0usage=3D"\
-Usage: $0 [--findoptions=3D'-option1 -option2...']
+Usage: $ourname [--findoptions=3D'-option1 -option2...']
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [--localpaths=3D'dir1 dir2...=
'] [--netpaths=3D'dir1 dir2...']
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [--prunepaths=3D'dir1 dir2...=
'] [--prunefs=3D'fs1 fs2...']
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [--output=3Ddbfile] [--netuse=
r=3Duser] [--localuser=3Duser]
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [--dbformat] [--version] [--help]
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [--dbformat=3D(LOCATE02|slocate)] [=
--keeptxt=3D(sort|both)]
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [--version] [--help]

 =C2=A0Please see also the documentation at=20
https://www.gnu.org/software/findutils/.
 =C2=A0Report (and track progress on fixing) bugs in the updatedb
@@ -61,8 +69,7 @@
 =C2=A0"
 =C2=A0changeto=3D/

-for arg
-do
+for arg; do
 =C2=A0=C2=A0 # If we are unable to fork, the back-tick operator will
 =C2=A0=C2=A0 # fail (and the shell will emit an error message).=C2=A0 Wh=
en
 =C2=A0=C2=A0 # this happens, we exit with error value 71 (EX_OSERR).
@@ -80,10 +87,11 @@
 =C2=A0=C2=A0=C2=A0=C2=A0 --localuser) LOCALUSER=3D"$val" ;;
 =C2=A0=C2=A0=C2=A0=C2=A0 --changecwd)=C2=A0 changeto=3D"$val" ;;
 =C2=A0=C2=A0=C2=A0=C2=A0 --dbformat)=C2=A0=C2=A0 dbformat=3D"$val" ;;
-=C2=A0=C2=A0=C2=A0 --version) fail=3D0; echo "$version" || fail=3D1; exi=
t $fail ;;
-=C2=A0=C2=A0=C2=A0 --help)=C2=A0=C2=A0=C2=A0 fail=3D0; echo "$usage"=C2=A0=
=C2=A0 || fail=3D1; exit $fail ;;
-=C2=A0=C2=A0=C2=A0 *) echo "updatedb: invalid option $opt
-Try '$0 --help' for more information." >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 --keeptxt)=C2=A0=C2=A0=C2=A0=C2=
=A0 keeptxt=3D"$val" ;;
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 --version) fail=3D0; echo "$v=
ersion" >&2 || fail=3D1; exit $fail ;;
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 --help)=C2=A0=C2=A0=C2=A0 fai=
l=3D0; echo "$usage"=C2=A0=C2=A0 >&2 || fail=3D1; exit $fail ;;
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *) stderr 'Invalid option "'$=
opt'".'
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo "=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Try '$ourname --help' fo=
r more information." >&2
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 exit 1 ;;
 =C2=A0=C2=A0 esac
 =C2=A0done
@@ -100,13 +108,87 @@
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ;;
 =C2=A0=C2=A0=C2=A0=C2=A0 *)
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 # The "old" database fo=
rmat is no longer supported.
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo "Unsupported locate data=
base format ${dbformat}: Supported=20
formats are:" >&2
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo "LOCATE02, slocate" >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 stderr 'Unsupported locate da=
tabase format "'$dbformat'".'
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo '=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Supported formats are "LOCATE02" or "sloca=
te".' >&2
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 exit 1
 =C2=A0esac

+# The database file to build (overridable via commandline or=20
environment var.).
+: ${LOCATE_DB=3D/var/locatedb}
+LOCATE_DB_DIR=3D`dirname $LOCATE_DB`
+
+# Prevent overlapping with ourselves.=C2=A0 Large filesystem collections=
 can=20
easily
+# take over 24 hours to complete, even on pretty speedy systems / hard=20
drives.
+# Ideally this would go in /var/run on systems that have that, but this=20
is OK.
+lockfile=3D$LOCATE_DB.running_updatedb_pid
+
+if [ -e $lockfile ]; then
+=C2=A0=C2=A0=C2=A0 stderr "Aborting since prior run's lockfile still exi=
sts:"
+=C2=A0=C2=A0=C2=A0 ls -lF $lockfile >&2
+=C2=A0=C2=A0=C2=A0 exit 1
+fi
+
+keeptxt=3Dneither
+reported_lockfile_failure=3D0
+
+cleanup_on_exit_or_signal() {
+=C2=A0=C2=A0=C2=A0 rm -f $LOCATE_DB.n
+
+=C2=A0=C2=A0=C2=A0 if [ $reported_lockfile_failure -ne 1 ]; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 # We didn't already have a fa=
ilure trying to initially create the
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 # lockfile, so we can assume =
the temporary .txt files are ours=20
(not
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 # saved on a previous run wit=
h --keeptxt), and it's safe to
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 # (optionally) delete them.
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if [ x"$keeptxt" =3D x"sort" =
]; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 rm -f=
 $LOCATE_DB.txt
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 elif [ x"$keeptxt" !=3D x"bot=
h" ]; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 # TBD=
: Report undefined values of --keeptxt?
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 rm -f=
 $LOCATE_DB.txt $LOCATE_DB.txt.sort
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 fi
+=C2=A0=C2=A0=C2=A0 fi
+
+=C2=A0=C2=A0=C2=A0 if ! rm -f $lockfile; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 report_lockfile_failure "remo=
ve"
+=C2=A0=C2=A0=C2=A0 fi
+}
+
+report_lockfile_failure() {
+=C2=A0=C2=A0=C2=A0 if [ $reported_lockfile_failure -ne 1 ]; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo -n "$ourname: Failed to =
$1 lockfile $lockfile" >&2
+
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if [ -e $lockfile ]; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo =
":" >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ls -l=
F $lockfile >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo =
" in dir:" >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ls -d=
lF $LOCATE_DB_DIR >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 fi
+
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 reported_lockfile_failure=3D1
+=C2=A0=C2=A0=C2=A0 fi
+}
+
+# Now that we've checked for a previous lockfile above, it's safe to=20
install
+# cleanup signal handler.=C2=A0 We'll try to catch all potentially fatal=
=20
signals,
+# along with exit.=C2=A0 From CentOS 7's /usr/include/asm/signal.h:
+#[shell exit=3D0] SIGHUP=3D1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 S=
IGINT=3D2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGQUIT=3D3 SIGILL=3D=
4
+#SIGTRAP=3D5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGABRT=3D6=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 SIGIOT=3D6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 S=
IGBUS=3D7 SIGFPE=3D8
+#SIGKILL=3D9=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGUSR1=3D10=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 SIGSEGV=3D11=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGUSR2=3D12 SIGP=
IPE=3D13
+#SIGALRM=3D14=C2=A0=C2=A0=C2=A0=C2=A0 SIGTERM=3D15=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 SIGSTKFLT=3D16=C2=A0=C2=A0=C2=A0 SIGCHLD=3D17 SIGCONT=3D18
+#SIGSTOP=3D19=C2=A0=C2=A0=C2=A0=C2=A0 SIGTSTP=3D20=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 SIGTTIN=3D21=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGTTOU=3D22 SIGURG=3D2=
3
+#SIGXCPU=3D24=C2=A0=C2=A0=C2=A0=C2=A0 SIGXFSZ=3D25=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 SIGVTALRM=3D26=C2=A0=C2=A0=C2=A0 SIGPROF=3D27 SIGWINCH=3D28
+#SIGIO=3D29=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGPOLL=3DSIGIO=C2=A0=C2=
=A0 SIGLOST=3D29=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SIGPWR=3D30 SIGSYS=3D31
+trap cleanup_on_exit_or_signal 0 2 3 4 6 7 8 9 11 15 16 30 31
+
+# Now that we've installed the signal handler, it's safe to create=20
lockfile.
+if ! echo $$ > $lockfile; then
+=C2=A0=C2=A0=C2=A0 report_lockfile_failure "write to"
+=C2=A0=C2=A0=C2=A0 exit 1
+fi

-if true
+# Don't use NUL as a path separator, now that we write to a temporary=20
text file
+# (may want to make that controllable with a commandline option in the=20
future).
+if false
 =C2=A0then
 =C2=A0=C2=A0=C2=A0=C2=A0 sort=3D"/usr/bin/sort -z"
 =C2=A0=C2=A0=C2=A0=C2=A0 print_option=3D"-print0"
@@ -123,7 +205,7 @@
 =C2=A0=C2=A0=C2=A0=C2=A0 id | cut -d'(' -f 1 | cut -d'=3D' -f2
 =C2=A0}

-# figure out if su supports the -s option
+# Figure out if su supports the -s option.
 =C2=A0select_shell() {
 =C2=A0=C2=A0=C2=A0=C2=A0 if su "$1" -s $SHELL -c false < /dev/null=C2=A0=
 ; then
 =C2=A0=C2=A0=C2=A0=C2=A0 # No.
@@ -140,8 +222,7 @@
 =C2=A0=C2=A0=C2=A0=C2=A0 fi
 =C2=A0}

-
-# You can set these in the environment, or use command-line options,
+# You can set these in the environment, or use command-line options
 =C2=A0# to override their defaults:

 =C2=A0# Any global options for find?
@@ -156,10 +237,13 @@
 =C2=A0# Network (NFS, AFS, RFS, etc.) directories to put in the database=
.
 =C2=A0: ${NETPATHS=3D}

-# Directories to not put in the database, which would otherwise be.
+# Default list of directories (overridable with options) to be omitted=20
from the
+# database.=C2=A0 Note that /dev and /proc need to be specified=20
"redundantly" here,
+# since on Cygwin, they can't be detected based on filesystem type.
 =C2=A0: ${PRUNEPATHS=3D"
 =C2=A0/afs
 =C2=A0/amd
+/dev
 =C2=A0/proc
 =C2=A0/sfs
 =C2=A0/tmp
@@ -167,24 +251,26 @@
 =C2=A0/var/tmp
 =C2=A0"}

-# Trailing slashes result in regex items that are never matched, which
-# is not what the user will expect.=C2=A0=C2=A0 Therefore we now reject =
such
-# constructs.
+# Trailing slashes result in regex items that are never matched, which i=
s
+# not what the user will expect.=C2=A0 Therefore we now reject such cons=
tructs.
+# TBD: Just remove any trailing slashes instead?
 =C2=A0for p in $PRUNEPATHS; do
 =C2=A0=C2=A0=C2=A0=C2=A0 case "$p" in
-=C2=A0=C2=A0=C2=A0 /*/)=C2=A0=C2=A0 echo "$0: $p: pruned paths should no=
t contain trailing=20
slashes" >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /*/) stderr "Prune path '$p' =
has a trailing slash, which isn't=20
allowed."
 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 exit 1
 =C2=A0=C2=A0=C2=A0=C2=A0 esac
 =C2=A0done

-# The same, in the form of a regex that find can use.
+# Convert $PRUNEPATHS to a regex that find can use.=C2=A0 Note that to a=
llow=20
paths
+# containing spaces, the first -e changes '\ ' to '///' ('//' isn't=20
used since
+# it's a semi-common artifact of path concatenation), and then the last =
-e
+# changes '///' back to ' ' (it doesn't need backslashing in the regex).
 =C2=A0test -z "$PRUNEREGEX" &&
-=C2=A0 PRUNEREGEX=3D`echo $PRUNEPATHS|sed -e 's,^,\\\(^,' -e 's,=20
,$\\\)\\\|\\\(^,g' -e 's,$,$\\\),'`
+=C2=A0 PRUNEREGEX=3D`echo $PRUNEPATHS | sed -e 's,\\\ ,///,g' -e 's,^,\\=
\(^,'=20
-e 's, ,$\\\)\\\|\\\(^,g' -e 's,$,$\\\),' -e 's,///, ,g'`

-# The database file to build.
-: ${LOCATE_DB=3D/var/locatedb}
-
-# Directory to hold intermediate files.
+# Directory for sort (& possibly other executables) to hold=20
intermediate files.
+# The script's own temporary files go in the same directory as the=20
database,
+# since they aren't always temporary (--keeptxt or left-behind lockfile)=
.
 =C2=A0if test -z "$TMPDIR"; then
 =C2=A0=C2=A0 if test -d /var/tmp; then
 =C2=A0=C2=A0=C2=A0=C2=A0 : ${TMPDIR=3D/var/tmp}
@@ -217,42 +303,19 @@
 =C2=A0: ${find:=3D${BINDIR}/find}
 =C2=A0: ${frcode:=3D${LIBEXECDIR}/frcode}

-make_tempdir () {
-=C2=A0=C2=A0=C2=A0 # This implementation is adapted from the GNU Autocon=
f manual.
-=C2=A0=C2=A0=C2=A0 {
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tmp=3D`
-=C2=A0=C2=A0=C2=A0 (umask 077 && mktemp -d "$TMPDIR/updatedbXXXXXX") 2>/=
dev/null
-=C2=A0=C2=A0=C2=A0 ` &&
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 test -n "$tmp" && test -d "$t=
mp"
-=C2=A0=C2=A0=C2=A0 } || {
-=C2=A0=C2=A0=C2=A0 # This method is less secure than mktemp -d, but it's=
 a fallback.
-=C2=A0=C2=A0=C2=A0 #
-=C2=A0=C2=A0=C2=A0 # We use $$ as well as $RANDOM since $RANDOM may not =
be available.
-=C2=A0=C2=A0=C2=A0 # We also add a time-dependent suffix.=C2=A0 This is =
actually somewhat
-=C2=A0=C2=A0=C2=A0 # predictable, but then so is $$.=C2=A0 POSIX does no=
t require date to
-=C2=A0=C2=A0=C2=A0 # support +%N.
-=C2=A0=C2=A0=C2=A0 ts=3D`date +%N%S || date +%S 2>/dev/null`
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tmp=3D"$TMPDIR"/updatedb"$$"-=
"${RANDOM:-}${ts}"
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (umask 077 && mkdir "$tmp")
-=C2=A0=C2=A0=C2=A0 }
-=C2=A0=C2=A0=C2=A0 echo "$tmp"
-}
-
 =C2=A0checkbinary () {
 =C2=A0=C2=A0=C2=A0=C2=A0 if test -x "$1" ; then
 =C2=A0=C2=A0=C2=A0=C2=A0 : ok
 =C2=A0=C2=A0=C2=A0=C2=A0 else
-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 eval echo "updatedb needs to be able to e=
xecute $1, but cannot." >&2
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 stderr "We need to be able to=
 execute $1, but cannot."
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 exit 1
 =C2=A0=C2=A0=C2=A0=C2=A0 fi
 =C2=A0}

-for binary in $find $frcode
-do
+for binary in $find $frcode; do
 =C2=A0=C2=A0 checkbinary $binary
 =C2=A0done

-
 =C2=A0: ${PRUNEFS=3D"
 =C2=A09P
 =C2=A0NFS
@@ -283,10 +346,20 @@
 =C2=A0fi

 =C2=A0# Make and code the file list.
-# Sort case insensitively for users' convenience.

-rm -f $LOCATE_DB.n
-trap 'rm -f $LOCATE_DB.n; exit' HUP TERM
+if ! echo test > $LOCATE_DB.n; then
+=C2=A0=C2=A0=C2=A0 stderr "Failed to write to temporary database file $L=
OCATE_DB.n."
+=C2=A0=C2=A0=C2=A0 exit 1
+fi
+
+# We now write to a temporary text file instead of going direct over a=20
pipe, as
+# the latter makes it very difficult to monitor progress and to debug=20
failures.
+if ! echo test > $LOCATE_DB.txt; then
+=C2=A0=C2=A0=C2=A0 stderr "Failed to write to text list of files $LOCATE=
_DB.txt."
+=C2=A0=C2=A0=C2=A0 exit 1
+fi
+
+failed_to_generate_locate_db=3D0

 =C2=A0if {
 =C2=A0cd "$changeto"
@@ -314,29 +387,43 @@
 =C2=A0=C2=A0=C2=A0=C2=A0 exit $?
 =C2=A0=C2=A0 else
 =C2=A0=C2=A0=C2=A0=C2=A0 # : A4
-=C2=A0=C2=A0=C2=A0 $find $NETPATHS $FINDOPTIONS \( -type d -regex "$PRUN=
EREGEX" -prune=20
\) -o $print_option ||
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 $find=
 $NETPATHS $FINDOPTIONS \( -type d -regex "$PRUNEREGEX" \
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 -prune \) -o $print_option ||
 =C2=A0=C2=A0=C2=A0=C2=A0 exit $?
 =C2=A0=C2=A0 fi
 =C2=A0fi
-} | $sort | $frcode $frcode_options > $LOCATE_DB.n
+} > $LOCATE_DB.txt
 =C2=A0then
-=C2=A0=C2=A0=C2=A0 : OK so far
-=C2=A0=C2=A0=C2=A0 true
+=C2=A0=C2=A0=C2=A0 # OK, find completed.=C2=A0 Going through all the fil=
es is very=20
time-consuming
+=C2=A0=C2=A0=C2=A0 # on some systems, so (try to) save a copy of the pre=
vious DB in case
+=C2=A0=C2=A0=C2=A0 # something goes wrong at this point.
+=C2=A0=C2=A0=C2=A0 cp -fp $LOCATE_DB $LOCATE_DB.prev
+
+=C2=A0=C2=A0=C2=A0 # Now sort results, case-insensitively for user conve=
nience, then=20
generate
+=C2=A0=C2=A0=C2=A0 # the new DB.
+=C2=A0=C2=A0=C2=A0 if ! $sort -f $LOCATE_DB.txt > $LOCATE_DB.txt.sort; t=
hen
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 failed_return_value=3D$?
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 failed_to_generate_locate_db=3D=
1
+=C2=A0=C2=A0=C2=A0 elif ! $frcode $frcode_options < $LOCATE_DB.txt.sort =
>=20
$LOCATE_DB.n; then
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 failed_return_value=3D$?
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 failed_to_generate_locate_db=3D=
1
+=C2=A0=C2=A0=C2=A0 fi
 =C2=A0else
-=C2=A0=C2=A0=C2=A0 rv=3D$?
-=C2=A0=C2=A0=C2=A0 echo "Failed to generate $LOCATE_DB.n" >&2
+=C2=A0=C2=A0=C2=A0 failed_to_generate_locate_db=3D1
+fi
+
+if [ $failed_to_generate_locate_db -eq 1 ]; then
+=C2=A0=C2=A0=C2=A0 stderr "Failed to generate new database temp file $LO=
CATE_DB.n."
 =C2=A0=C2=A0=C2=A0=C2=A0 rm -f $LOCATE_DB.n
-=C2=A0=C2=A0=C2=A0 exit $rv
+=C2=A0=C2=A0=C2=A0 exit $failed_return_value
 =C2=A0fi

-# To avoid breaking locate while this script is running, put the
+# To avoid breaking locate while this script is running, we put the
 =C2=A0# results in a temp file, then rename it atomically.
 =C2=A0if test -s $LOCATE_DB.n; then
-=C2=A0 chmod 644 ${LOCATE_DB}.n
-=C2=A0 mv ${LOCATE_DB}.n $LOCATE_DB
+=C2=A0=C2=A0=C2=A0 chmod 644 $LOCATE_DB.n
+=C2=A0=C2=A0=C2=A0 mv -f $LOCATE_DB.n $LOCATE_DB
 =C2=A0else
-=C2=A0 echo "updatedb: new database would be empty" >&2
+=C2=A0=C2=A0=C2=A0 stderr "New database would be empty, so not creating =
it."
 =C2=A0=C2=A0 rm -f $LOCATE_DB.n
 =C2=A0fi
-
-exit 0

Dan Harkless
http://harkless.org/dan/

--------------Rc0dG5cqRTsWqdOiM0eF20FW
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