97 lines
3.4 KiB
Diff
97 lines
3.4 KiB
Diff
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From c78fa2b40cb8b810d06ef225e30f12a7ed44ffa2 Mon Sep 17 00:00:00 2001
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From: "Yann E. MORIN" <yann.morin.1998@free.fr>
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Date: Sat, 1 Apr 2017 11:26:29 +0200
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Subject: [PATCH] build: check for ln --relative
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ln --relative is recent enough that not all distributions support it.
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This is especially the case for enterprise-grade distributions than can
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have a life-span of more than a decade.
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Detect if ln supports --relative and use it if so.
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If not supported, use a bit of sed magic to construct the ../ sequence,
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that leads back to / when appended to the destination directory.
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We introduce this as a macro that expands to a single command. To avoid
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complexity in the macro, we expect paths to be passed whitout the
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leading DESTDIR.
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---
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Upstream status: submitted, disputed:
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https://github.com/systemd/systemd/pull/5682
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---
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Makefile.am | 25 ++++++++++++++++++++++---
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configure.ac | 5 ++++-
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2 files changed, 26 insertions(+), 4 deletions(-)
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diff --git a/Makefile.am b/Makefile.am
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index 1cc657a..ec503f2 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -300,6 +300,24 @@ install-busnames-target-wants-hook:
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what="$(BUSNAMES_TARGET_WANTS)" && wants=busnames.target && dir=$(systemunitdir) && $(add-wants)
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what="$(USER_BUSNAMES_TARGET_WANTS)" && wants=busnames.target && dir=$(userunitdir) && $(add-wants)
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+# Macro to emulate ln --relative when needed
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+# $(1): options for ln, except --relative
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+# $(2): source file, absolute path without leading DESTDIR
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+# $(3): destination file, absolute path without leading DESTDIR
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+if HAVE_LN_RELATIVE
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+define ln-s-relative
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+ $(LN_S) --relative $(1) \
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+ $(DESTDIR)$(strip $(2)) \
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+ $(DESTDIR)$(strip $(3))
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+endef
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+else
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+define ln-s-relative
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+ $(LN_S) $(1) \
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+ `dirname $(strip $(3)) |sed -r -e 's:/+[^/]+:../:g; s:/$$::'`$(strip $(2)) \
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+ $(DESTDIR)$(strip $(3))
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+endef
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+endif
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+
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define add-wants
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[ -z "$$what" ] || ( \
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dir=$(DESTDIR)$$dir/$$wants.wants && \
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@@ -313,8 +331,9 @@ install-directories-hook:
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$(MKDIR_P) $(addprefix $(DESTDIR),$(INSTALL_DIRS))
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install-environment-conf-hook: install-directories-hook
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- $(AM_V_LN)$(LN_S) --relative -f $(DESTDIR)$(sysconfdir)/environment \
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- $(DESTDIR)$(environmentdir)/99-environment.conf
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+ $(AM_V_LN)$(call ln-s-relative,-f,\
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+ $(sysconfdir)/environment,\
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+ $(environmentdir)/99-environment.conf)
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install-aliases-hook:
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set -- $(SYSTEM_UNIT_ALIASES) && \
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@@ -337,7 +356,7 @@ define install-relative-aliases
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while [ -n "$$1" ]; do \
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$(MKDIR_P) `dirname $(DESTDIR)$$dir/$$2` && \
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rm -f $(DESTDIR)$$dir/$$2 && \
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- $(LN_S) --relative $(DESTDIR)$$1 $(DESTDIR)$$dir/$$2 && \
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+ $(call ln-s-relative,,$$1,$$dir/$$2) && \
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shift 2 || exit $$?; \
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done
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endef
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diff --git a/configure.ac b/configure.ac
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index cf37ca6..d586fc4 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -108,7 +108,10 @@ AC_PATH_PROG([SULOGIN], [sulogin], [/usr/sbin/sulogin], [$PATH:/usr/sbin:/sbin])
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AC_PATH_PROG([MOUNT_PATH], [mount], [/usr/bin/mount], [$PATH:/usr/sbin:/sbin])
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AC_PATH_PROG([UMOUNT_PATH], [umount], [/usr/bin/umount], [$PATH:/usr/sbin:/sbin])
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-AS_IF([! ln --relative --help > /dev/null 2>&1], [AC_MSG_ERROR([*** ln doesn't support --relative ***])])
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+AC_MSG_CHECKING([if ln supports --relative])
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+AS_IF([! ${LN_S} --relative --help > /dev/null 2>&1], [ln_relative=no], [ln_relative=yes])
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+AC_MSG_RESULT([$ln_relative])
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+AM_CONDITIONAL([HAVE_LN_RELATIVE], [test "x$ln_relative" = "xyes"])
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M4_DEFINES=
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--
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2.9.3
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