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elfutils/elfutils-0.169-strip-empty....

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commit b065d4a401e2120c11c92357b213a85e6d70f300
Author: Mark Wielaard <mark@klomp.org>
Date: Wed Jun 7 20:32:38 2017 +0200
strip: Don't generate empty output file when nothing to do.
If there was nothing to do strip would skip generating a separate
debug file if one was requested, but it would also not finish the
creation of a new output file (with the non-stripped sections).
Also if there was an error any partially created output would be kept.
Make sure that when the -o output file option is given we always generate
a complete output file (except on error). Also make sure that when the -f
debug file option is given it is only generated when it is not empty.
Add testcase run-strip-nothing.sh that tests the various combinations.
https://sourceware.org/bugzilla/show_bug.cgi?id=21522
Signed-off-by: Mark Wielaard <mark@klomp.org>
diff --git a/src/ChangeLog b/src/ChangeLog
index 6ac0ef2..e19122e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2017-06-07 Mark Wielaard <mark@klomp.org>
+
+ * strip.c (handle_elf): Introduce new handle_elf boolean. Use it to
+ determine whether to create an output and/or debug file. Remove new
+ output file on error.
+
2017-06-06 Mark Wielaard <mark@klomp.org>
* strip.c (handle_elf): Assume e_shstrndx section can be removed.
diff --git a/src/strip.c b/src/strip.c
index 11b2a37..2bf95f9 100644
--- a/src/strip.c
+++ b/src/strip.c
@@ -1063,15 +1063,17 @@ handle_elf (int fd, Elf *elf, const char *prefix, const char *fname,
shdr_info[cnt].se = dwelf_strtab_add (shst, shdr_info[cnt].name);
}
- /* Test whether we are doing anything at all. */
- if (cnt == idx
- || (cnt == idx + 1 && shdr_info[ehdr->e_shstrndx].idx == 0))
- /* Nope, all removable sections are already gone. Or the only section
- we would remove is the .shstrtab section which we will add again. */
- goto fail_close;
-
- /* Create the reference to the file with the debug info. */
- if (debug_fname != NULL && !remove_shdrs)
+ /* Test whether we are doing anything at all. Either all removable
+ sections are already gone. Or the only section we would remove is
+ the .shstrtab section which we would add again. */
+ bool removing_sections = !(cnt == idx
+ || (cnt == idx + 1
+ && shdr_info[ehdr->e_shstrndx].idx == 0));
+ if (output_fname == NULL && !removing_sections)
+ goto fail_close;
+
+ /* Create the reference to the file with the debug info (if any). */
+ if (debug_fname != NULL && !remove_shdrs && removing_sections)
{
/* Add the section header string table section name. */
shdr_info[cnt].se = dwelf_strtab_add_len (shst, ".gnu_debuglink", 15);
@@ -1759,7 +1761,8 @@ handle_elf (int fd, Elf *elf, const char *prefix, const char *fname,
/* Remove any relocations between debug sections in ET_REL
for the debug file when requested. These relocations are always
zero based between the unallocated sections. */
- if (debug_fname != NULL && reloc_debug && ehdr->e_type == ET_REL)
+ if (debug_fname != NULL && removing_sections
+ && reloc_debug && ehdr->e_type == ET_REL)
{
scn = NULL;
cnt = 0;
@@ -1997,7 +2000,7 @@ handle_elf (int fd, Elf *elf, const char *prefix, const char *fname,
/* Now that we have done all adjustments to the data,
we can actually write out the debug file. */
- if (debug_fname != NULL)
+ if (debug_fname != NULL && removing_sections)
{
/* Finally write the file. */
if (unlikely (elf_update (debugelf, ELF_C_WRITE) == -1))
@@ -2230,7 +2233,11 @@ cannot set access and modification date of '%s'"),
/* Close the file descriptor if we created a new file. */
if (output_fname != NULL)
- close (fd);
+ {
+ close (fd);
+ if (result != 0)
+ unlink (output_fname);
+ }
return result;
}
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 5800946..5550eac 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,9 @@
+2017-06-07 Mark Wielaard <mark@klomp.org>
+
+ * run-strip-nothing.sh: New test.
+ * Makefile.am (TESTS): Add run-strip-nothing.sh.
+ (EXTRA_DIST): Likewise.
+
2017-06-06 Mark Wielaard <mark@klomp.org>
* run-strip-test.sh: Test strip -g doesn't introduce extra .shstrtab.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3a12fe3..28e997c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -81,6 +81,7 @@ TESTS = run-arextract.sh run-arsymtest.sh newfile test-nlist \
run-strip-test3.sh run-strip-test4.sh run-strip-test5.sh \
run-strip-test6.sh run-strip-test7.sh run-strip-test8.sh \
run-strip-test9.sh run-strip-test10.sh run-strip-test11.sh \
+ run-strip-nothing.sh \
run-strip-groups.sh run-strip-reloc.sh run-strip-strmerge.sh \
run-strip-nobitsalign.sh \
run-unstrip-test.sh run-unstrip-test2.sh run-unstrip-test3.sh \
@@ -174,6 +175,7 @@ EXTRA_DIST = run-arextract.sh run-arsymtest.sh \
run-strip-test4.sh run-strip-test5.sh run-strip-test6.sh \
run-strip-test7.sh run-strip-test8.sh run-strip-groups.sh \
run-strip-test9.sh run-strip-test10.sh run-strip-test11.sh \
+ run-strip-nothing.sh \
run-strip-strmerge.sh run-strip-nobitsalign.sh \
testfile-nobitsalign.bz2 testfile-nobitsalign.strip.bz2 \
run-strip-reloc.sh hello_i386.ko.bz2 hello_x86_64.ko.bz2 \
diff --git a/tests/run-strip-nothing.sh b/tests/run-strip-nothing.sh
new file mode 100755
index 0000000..e80bd90
--- /dev/null
+++ b/tests/run-strip-nothing.sh
@@ -0,0 +1,62 @@
+#! /bin/sh
+# Copyright (C) 2017 Red Hat, Inc.
+# This file is part of elfutils.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# elfutils 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+. $srcdir/test-subr.sh
+
+# If there is nothing to strip then -o output should be identical to input.
+# And there should not be an (empty) -f debug file.
+
+tempfiles a.out strip.out debug.out
+
+# Create no-debug a.out.
+echo "int main() { return 1; }" | gcc -xc -
+
+# strip to file
+testrun ${abs_top_builddir}/src/strip -g -o strip.out ||
+ { echo "*** failed to strip -g -o strip.out a.out"; exit -1; }
+
+testrun ${abs_top_builddir}/src/elfcmp a.out strip.out ||
+ { echo "*** failed strip.out different from a.out"; exit -1; }
+
+# strip original
+testrun ${abs_top_builddir}/src/strip -g ||
+ { echo "*** failed to strip -g a.out"; exit -1; }
+
+testrun ${abs_top_builddir}/src/elfcmp strip.out a.out ||
+ { echo "*** failed a.out different from strip.out"; exit -1; }
+
+# strip to file with debug file
+testrun ${abs_top_builddir}/src/strip -g -o strip.out -f debug.out ||
+ { echo "*** failed to strip -g -o strip.out -f debug.out a.out"; exit -1; }
+
+testrun ${abs_top_builddir}/src/elfcmp a.out strip.out ||
+ { echo "*** failed strip.out different from a.out (with debug)"; exit -1; }
+
+test ! -f debug.out ||
+ { echo "*** failed strip.out and debug.out exist"; exit -1; }
+
+# strip original with debug file
+testrun ${abs_top_builddir}/src/strip -g -f debug.out ||
+ { echo "*** failed to strip -g -f debug.out a.out"; exit -1; }
+
+testrun ${abs_top_builddir}/src/elfcmp strip.out a.out ||
+ { echo "*** failed a.out different from strip.out (with debug)"; exit -1; }
+
+test ! -f debug.out ||
+ { echo "*** failed a.out and debug.out exist"; exit -1; }
+
+exit 0
--- elfutils-0.169/tests/Makefile.in.orig 2017-06-07 21:48:55.475994222 +0200
+++ elfutils-0.169/tests/Makefile.in 2017-06-07 21:49:20.441430261 +0200
@@ -138,8 +138,8 @@
run-strip-test.sh run-strip-test2.sh run-strip-test3.sh \
run-strip-test4.sh run-strip-test5.sh run-strip-test6.sh \
run-strip-test7.sh run-strip-test8.sh run-strip-test9.sh \
- run-strip-test10.sh run-strip-test11.sh run-strip-groups.sh \
- run-strip-reloc.sh run-strip-strmerge.sh \
+ run-strip-test10.sh run-strip-test11.sh run-strip-nothing.sh \
+ run-strip-groups.sh run-strip-reloc.sh run-strip-strmerge.sh \
run-strip-nobitsalign.sh run-unstrip-test.sh \
run-unstrip-test2.sh run-unstrip-test3.sh run-unstrip-test4.sh \
run-unstrip-M.sh run-elfstrmerge-test.sh run-ecp-test.sh \
@@ -1046,6 +1046,7 @@
run-strip-test4.sh run-strip-test5.sh run-strip-test6.sh \
run-strip-test7.sh run-strip-test8.sh run-strip-groups.sh \
run-strip-test9.sh run-strip-test10.sh run-strip-test11.sh \
+ run-strip-nothing.sh \
run-strip-strmerge.sh run-strip-nobitsalign.sh \
testfile-nobitsalign.bz2 testfile-nobitsalign.strip.bz2 \
run-strip-reloc.sh hello_i386.ko.bz2 hello_x86_64.ko.bz2 \
@@ -2332,6 +2333,13 @@
$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
--log-file $$b.log --trs-file $$b.trs \
$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+ "$$tst" $(AM_TESTS_FD_REDIRECT)
+run-strip-nothing.sh.log: run-strip-nothing.sh
+ @p='run-strip-nothing.sh'; \
+ b='run-strip-nothing.sh'; \
+ $(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+ --log-file $$b.log --trs-file $$b.trs \
+ $(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
"$$tst" $(AM_TESTS_FD_REDIRECT)
run-strip-groups.sh.log: run-strip-groups.sh
@p='run-strip-groups.sh'; \
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