First check in

Makefile

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+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as 
+# published by the Free Software Foundation here:
+# (http://www.gnu.org/licenses/gpl-2.0.html)
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+DEPENDS =
+ARCH = x86_64
+URL = https://people.freebsd.org/~abe/
+DESC = The free, open-source, Unix administrative tool lsof (for LiSt \
+Open Files) displays information about files open to Unix processes
+SNAPVER = sr0
+
+ARCHIVE := $(PWD)/SRC/$(shell ls SRC|egrep '(bz2|gz|tar|xz)$$'|tail -1)
+TYPE := $(shell file -ib $(ARCHIVE)|cut -d';' -f1|tr -d '\n')
+SRCDIR := $(shell tar -tf $(ARCHIVE)|head -1|sed 's/\/.*//')
+PATCHDIR := $(PWD)/SRC/patches
+UPSTRVER := $(shell echo $(SRCDIR)|egrep -o '\_[0-9].*'|sed 's/^_//')
+VERSION := $(UPSTRVER)$(SNAPVER)
+
+MAKE = make
+SNAPHACKS =
+
+include /usr/share/snap/Makefile.snaplinux
+
+$(SRCDIR)/lsof_$(UPSTRVER).tar: $(ARCHIVE)
+	@if [ '$(TYPE)' == 'application/x-bzip2' ]; then \
+		tar -jxf $(ARCHIVE); \
+	elif [ '$(TYPE)' == 'application/x-gzip' ]; then \
+		tar -zxf $(ARCHIVE); \
+	elif [ '$(TYPE)' == 'application/x-tar' ]; then \
+		tar -xf $(ARCHIVE); \
+	elif [ '$(TYPE)' == 'application/x-xz' ]; then \
+		tar -xf $(ARCHIVE); \
+	else \
+		echo 'Unable to determine archive type'; \
+		exit 1; \
+	fi
+	@touch $(SRCDIR)/lsof_$(UPSTRVER).tar
+
+$(SRCDIR)/lsof_$(UPSTRVER)_src/Makefile: $(SRCDIR)/lsof_$(UPSTRVER).tar
+	@cd $(SRCDIR); \
+	tar xvf lsof_$(UPSTRVER)_src.tar && \
+	cd lsof_$(UPSTRVER)_src && \
+	for patch in `find $(PATCHDIR) -name \*.patch`; do \
+		patch --verbose -Np1 -i $$patch; \
+	done && \
+	./Configure -n linux
+
+$(SRCDIR)/lsof_$(UPSTRVER)_src/lsof: $(SRCDIR)/lsof_$(UPSTRVER)_src/Makefile
+	@cd $(SRCDIR)/lsof_$(UPSTRVER)_src; \
+	$(MAKE)
+
+$(ROOT): $(SRCDIR)/lsof_$(UPSTRVER)_src/lsof
+	@if [ -d $(ROOT) ]; then \
+		touch $(ROOT); \
+	else \
+		mkdir -v $(ROOT); \
+	fi
+
+	@cd $(SRCDIR)/lsof_$(UPSTRVER)_src/ && \
+	install -v -d -m 755 $(ROOT)/usr/bin && \
+	install -v -d -m 755 $(ROOT)/usr/share/man/man8 && \
+	install -v -m 755 lsof $(ROOT)/usr/bin && \
+	install -v lsof.8 $(ROOT)/usr/share/man/man8
+
+	@$(SNAPHACKS)
+
+test: $(ROOT)
+	@cd $(SRCDIR)/lsof_4.89_src/tests && \
+	make test
+
+clean:
+	@rm -rvf $(ROOT) \
+		$(SNAPINFO) \
+		$(MANIFEST) \
+		$(FILES) \
+		$(SRCDIR)
+

SNAP/README

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+This is the directory where the manifest, snapinfo, and files.tar.gz
+files will be created. It is also where the usher file should be
+placed if it is required by the package.

SRC/patches/README

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+Place any patch files here and preface each with a number indicating
+the order of execution. Patch files are expected to use a .patch extension.