[jhalfs] 08/14: BLFS/Makefile: Don't run git checkout if {B,}LFS-BRANCH is empty

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commit 1242857a75d91b099a6af90b8626a6c0d99bd016
Author: Pierre Labastie <[email protected]>
AuthorDate: Wed Mar 30 22:33:08 2022 +0200

    BLFS/Makefile: Don't run git checkout if {B,}LFS-BRANCH is empty
    
    Fix also the order of checkout trunk and checkout $(...-BRANCH)
---
 BLFS/Makefile | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/BLFS/Makefile b/BLFS/Makefile
index 6ed9c61..590bfa3 100644
--- a/BLFS/Makefile
+++ b/BLFS/Makefile
@@ -191,31 +191,38 @@ all: update $(BOOK_XML)
 # trunk before updating, and switch back to the branch/tag afterwards
 update: $(BLFS_XML) $(LFS_XML)
 	@echo Updating the book sources
+ifneq (,$(LFS-BRANCH))
 	$(Q)cd $(LFS_XML) && \
-	if [ $(LFS-BRANCH) != trunk ]; then git switch -; fi && \
+	git checkout trunk && \
 	git pull && \
-	git checkout $(LFS-BRANCH)
+	if [ $(LFS-BRANCH) != trunk ]; then git checkout $(LFS-BRANCH); fi
+endif
+ifneq (,$(BLFS-BRANCH))
 	$(Q)cd $(BLFS_XML) && \
-        if [ $(BLFS-BRANCH) != trunk ]; then git switch -; fi && \
+        git checkout trunk && \
         git pull && \
-        git checkout $(BLFS-BRANCH)
+        if [ $(BLFS-BRANCH) != trunk ]; then git checkout $(BLFS-BRANCH); fi
+endif
 
 $(LFS_XML):
 	@echo Getting the LFS book sources...
 	$(Q)git clone $(LFS-GIT) $@
+ifneq (,$(LFS-BRANCH))
 	if [ $(LFS-BRANCH) != trunk ]; then \
 	    cd $@ && \
 	    git checkout $(LFS-BRANCH); \
 	fi
+endif
 
 $(BLFS_XML):
 	@echo Getting the BLFS book sources...
 	$(Q)git clone $(GIT) $@
+ifneq (,$(BLFS-BRANCH))
 	$(Q)if [ $(BLFS-BRANCH) != trunk ]; then \
 	    cd $@ && \
 	    git checkout $(BLFS-BRANCH); \
 	fi
-
+endif
 # Clean up
 
 clean:

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