cb610d54b4
The third field in the /etc/shadow file (sp_lstchg) contains the date of
the last password change expressed as the number of days since Jan 1, 1970.
As this is a relative time, creating a user today will result in:
username:17238:0:99999:7:::
whilst creating the same user tomorrow will result in:
username:17239:0:99999:7:::
This has an impact for the Reproducible Builds[0] project where we aim to
be independent of as many elements the build environment as possible,
including the current date.
This patch changes the behaviour to use the SOURCE_DATE_EPOCH[1]
environment variable (instead of Jan 1, 1970) if valid.
[0] https://reproducible-builds.org/
[1] https://reproducible-builds.org/specs/source-date-epoch/
Signed-off-by: Chris Lamb <lamby@debian.org>
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/*
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* Copyright (c) 2017, Chris Lamb
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include "defines.h"
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#include "prototypes.h"
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/*
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* gettime() returns the time as the number of seconds since the Epoch
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*
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* Like time(), gettime() returns the time as the number of seconds since the
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* Epoch, 1970-01-01 00:00:00 +0000 (UTC), except that if the SOURCE_DATE_EPOCH
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* environment variable is exported it will use that instead.
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*/
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/*@observer@*/time_t gettime ()
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{
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char *endptr;
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char *source_date_epoch;
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time_t fallback;
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unsigned long long epoch;
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fallback = time (NULL);
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source_date_epoch = getenv ("SOURCE_DATE_EPOCH");
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if (!source_date_epoch)
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return fallback;
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errno = 0;
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epoch = strtoull (source_date_epoch, &endptr, 10);
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if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0))
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|| (errno != 0 && epoch == 0)) {
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fprintf (stderr,
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_("Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n"),
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strerror(errno));
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} else if (endptr == source_date_epoch) {
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fprintf (stderr,
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_("Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n"),
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endptr);
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} else if (*endptr != '\0') {
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fprintf (stderr,
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_("Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n"),
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endptr);
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} else if (epoch > ULONG_MAX) {
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fprintf (stderr,
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_("Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to %lu but was found to be: %llu\n"),
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ULONG_MAX, epoch);
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} else if (epoch > fallback) {
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fprintf (stderr,
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_("Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to the current time (%lu) but was found to be: %llu\n"),
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fallback, epoch);
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} else {
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/* Valid */
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return (time_t)epoch;
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}
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return fallback;
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}
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