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Make the sp_lstchg shadow field reproducible.

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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>
This commit is contained in:
Chris Lamb
2017-03-15 10:36:21 +00:00
committed by Chris Lamb
parent 2f36da5201
commit cb610d54b4
8 changed files with 100 additions and 7 deletions
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1
libmisc/Makefile.am
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@@ -31,6 +31,7 @@ libmisc_a_SOURCES = \
getdate.y \
getgr_nam_gid.c \
getrange.c \
gettime.c \
hushed.c \
idmapping.h \
idmapping.c \