Make the sp_lstchg shadow field reproducible.
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>
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@ -641,7 +641,7 @@ static void new_spent (struct spwd *spent)
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spent->sp_pwdp = new_pw_passwd (spent->sp_pwdp);
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if (pflg) {
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spent->sp_lstchg = (long) time ((time_t *) 0) / SCALE;
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spent->sp_lstchg = (long) gettime () / SCALE;
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if (0 == spent->sp_lstchg) {
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/* Better disable aging than requiring a password
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* change. */
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@ -1673,7 +1673,7 @@ static void usr_update (void)
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spent.sp_pwdp = xstrdup (pwent.pw_passwd);
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pwent.pw_passwd = xstrdup (SHADOW_PASSWD_STRING);
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spent.sp_lstchg = (long) time ((time_t *) 0) / SCALE;
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spent.sp_lstchg = (long) gettime () / SCALE;
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if (0 == spent.sp_lstchg) {
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/* Better disable aging than
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* requiring a password change */
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