[Buildroot] [git commit branch/2021.05.x] package/coreutils: Prevent overwriting of fakedate

[Peter Korsgaard <peter@korsgaard.com>]

commit: https://git.buildroot.net/buildroot/commit/?id=5126808849792039dcb9cde0c8d183ef48b68ef6
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.x

When BR2_REPRODUCIBLE is set and host-coreutils needs to be built, the
fakedate script installed to 'host/bin/date' will be overwritten by
host-coreutils.

Besides, we do not need our host-coreutils for 'date' at all; we really
rely on the host system to provide it.

Unconditionally disable installing the 'date' binary in host-coreutils.

Note that we explicitly request only ln and realpath to be installed,
but the coreutils buildsystem does not strictly obey to that, as was
already noticed in 885e6fdb8a40 (package/coreutils: introduce a host
variant), which added that comment above HOST_COREUTILS_CONF_OPTS:

    # Explicitly install ln and realpath, which we *are* insterested in.
    # A lot of other programs still get installed, however, but disabling
    # them does not gain much at build time, and is a loooong list that is
    # difficult to maintain...

So, we also update that comment to explain why we still anyway disable
installation of 'date'.

Signed-off-by: Conrad Ratschan <conrad.ratschan@collins.com>
[yann.morin.1998@free.fr:
  - unconditionally disable installing date
  - extend comment and commit log to explain why we need
    --enable-no-install-program=date despite the existing
    --enable-install-program=ln,realpath
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit bdf792910945f287beda6d9262492f1910646a61)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/coreutils/coreutils.mk | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/package/coreutils/coreutils.mk b/package/coreutils/coreutils.mk
index 65234a113e..3ec3c847c2 100644
--- a/package/coreutils/coreutils.mk
+++ b/package/coreutils/coreutils.mk
@@ -154,7 +154,8 @@ COREUTILS_POST_INSTALL_TARGET_HOOKS += COREUTILS_FIX_CHROOT_LOCATION
 # Explicitly install ln and realpath, which we *are* insterested in.
 # A lot of other programs still get installed, however, but disabling
 # them does not gain much at build time, and is a loooong list that is
-# difficult to maintain...
+# difficult to maintain... Just avoid overwriting fakedate when creating
+# a reproducible build
 HOST_COREUTILS_CONF_OPTS = \
 	--disable-acl \
 	--disable-libcap \
@@ -162,7 +163,8 @@ HOST_COREUTILS_CONF_OPTS = \
 	--disable-single-binary \
 	--disable-xattr \
 	--without-gmp \
-	--enable-install-program=ln,realpath
+	--enable-install-program=ln,realpath \
+	--enable-no-install-program=date
 
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))
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