[PATCH] untar: Make behavior similar to GNU or BSD tar
Joel Sherrill
joel at rtems.org
Mon Dec 6 15:26:44 UTC 2021
On Mon, Dec 6, 2021 at 9:11 AM Christian MAUDERER
<christian.mauderer at embedded-brains.de> wrote:
>
> Hello Joel,
>
> thanks for the review. I'll apply it on master in the next few days.
>
> The behavior that our untar can't overwrite directories is in 5 too. The
> behavior on 5 changed last with the patches from ticket #3823 in
> 2019-11. I would lean to creating a ticket for 5 and apply the patch
> there too. What do you think?
I think it is worth fixing. Go ahead.
If there isn't any documentation on the untar family, please file a ticket
on that.
FWIW Ryan is trying to get all the tools to build on 5 so we can add
it to the automated build sweep. There will likely be more patches like
his dtc upgrade to allow things to build.
--joel
>
> Best regards
>
> Christian
>
> Am 03.12.21 um 18:34 schrieb Joel Sherrill:
> > I don't see anything that would stop this from being committed.
> >
> > This does make me realize that I think all of the untar capabilities
> > are undocumented.
> >
> > --joel
> >
> > On Fri, Dec 3, 2021 at 6:51 AM Christian Mauderer
> > <christian.mauderer at embedded-brains.de> wrote:
> >>
> >> RTEMS untar implementation had problems with overwriting or integrating
> >> archives into existing directory structures. This patch adapts the
> >> behavior to mimic that of a GNU tar or BSD tar and extends the tar01
> >> test to check for the behavior. That is:
> >>
> >> * If a directory structure exists, the files from the archive will be
> >> integrated. Existing files are overwritten.
> >>
> >> * If a file exists and the archive contains a directory with the same
> >> name, the file is removed and a directory is created. In the above
> >> example: if l1/l2 is a file it will be overwritten with a new
> >> directory.
> >>
> >> * If a directory exists and the archive contains a file with the same
> >> name, the directory will be replaced if it is empty. If it contains
> >> files, the result is an error.
> >>
> >> * An archive also can contain only a file without the parent
> >> directories. If in that case one of the parent directories exists as a
> >> file extracting the archive results in an error. In the example: if
> >> l1/l2 is a file and the archive doesn't contain the directories but
> >> only the file l1/l2/x.txt that would be an error.
> >>
> >> * In case of an error, it is possible that the archive has been
> >> partially extracted.
> >>
> >> Closes #4552
> >> ---
> >> cpukit/libmisc/untar/untar.c | 57 +++++---
> >> testsuites/libtests/tar01/init.c | 199 +++++++++++++++++++++++++++-
> >> testsuites/libtests/tar01/tar01.doc | 1 +
> >> testsuites/libtests/tar01/tar01.scn | 54 ++++++--
> >> testsuites/libtests/tar01/tar01.tar | Bin 10240 -> 10240 bytes
> >> 5 files changed, 282 insertions(+), 29 deletions(-)
> >>
> >> diff --git a/cpukit/libmisc/untar/untar.c b/cpukit/libmisc/untar/untar.c
> >> index a2f09fb99f..8888ab2c57 100644
> >> --- a/cpukit/libmisc/untar/untar.c
> >> +++ b/cpukit/libmisc/untar/untar.c
> >> @@ -126,30 +126,25 @@ Make_Path(const rtems_printer *printer, char *path)
> >>
> >> *p = '\0';
> >> if (p[1] == '\0') {
> >> - /* Speculatively unlink the last component so that it can be re-created */
> >> - unlink(path);
> >> return 0;
> >> }
> >>
> >> if (mkdir(path, S_IRWXU | S_IRWXG | S_IRWXO) != 0) {
> >> - if (errno == EEXIST || errno == EISDIR) {
> >> + if (errno == EEXIST) {
> >> + /* If it exists already: Check whether it is a directory */
> >> struct stat sb;
> >> -
> >> - if (stat(path, &sb) != 0) {
> >> + if (lstat(path, &sb) != 0) {
> >> + Print_Error(printer, "lstat", path);
> >> + return -1;
> >> + } else if (!S_ISDIR(sb.st_mode)) {
> >> + rtems_printf(printer,
> >> + "untar: mkdir: %s: exists but is not a directory\n",
> >> + path);
> >> return -1;
> >> }
> >> -
> >> - if (!S_ISDIR(sb.st_mode)) {
> >> - if (unlink(path) != 0) {
> >> - Print_Error(printer, "unlink", path);
> >> - return -1;
> >> - }
> >> -
> >> - if (mkdir(path, S_IRWXU | S_IRWXG | S_IRWXO) != 0) {
> >> - Print_Error(printer, "mkdir (unlink)", path);
> >> - return -1;
> >> - }
> >> - }
> >> + } else {
> >> + Print_Error(printer, "mkdir", path);
> >> + return -1;
> >> }
> >> }
> >>
> >> @@ -206,6 +201,12 @@ Untar_ProcessHeader(
> >>
> >> if (Make_Path(ctx->printer, ctx->file_path) != 0) {
> >> retval = UNTAR_FAIL;
> >> + } else {
> >> + /*
> >> + * Speculatively unlink. This should unlink everything but non-empty
> >> + * directories or write protected stuff.
> >> + */
> >> + unlink(ctx->file_path);
> >> }
> >>
> >> if (ctx->linkflag == SYMTYPE) {
> >> @@ -225,8 +226,22 @@ Untar_ProcessHeader(
> >> rtems_printf(ctx->printer, "untar: dir: %s\n", ctx->file_path);
> >> r = mkdir(ctx->file_path, ctx->mode);
> >> if (r != 0) {
> >> - Print_Error(ctx->printer, "mkdir", ctx->file_path);
> >> - retval = UNTAR_FAIL;
> >> + if (errno == EEXIST) {
> >> + /* If it exists already: Check whether it is a directory */
> >> + struct stat sb;
> >> + if (lstat(ctx->file_path, &sb) != 0) {
> >> + Print_Error(ctx->printer, "lstat", ctx->file_path);
> >> + retval = UNTAR_FAIL;
> >> + } else if (!S_ISDIR(sb.st_mode)) {
> >> + rtems_printf(ctx->printer,
> >> + "untar: mkdir: %s: exists but is not a directory\n",
> >> + ctx->file_path);
> >> + retval = UNTAR_FAIL;
> >> + }
> >> + } else {
> >> + Print_Error(ctx->printer, "mkdir", ctx->file_path);
> >> + retval = UNTAR_FAIL;
> >> + }
> >> }
> >> }
> >>
> >> @@ -426,7 +441,9 @@ Untar_FromFile_Print(
> >> */
> >>
> >> if ((out_fd = creat(ctx.file_path, ctx.mode)) == -1) {
> >> - (void) lseek(fd, SEEK_CUR, 512UL * ctx.nblocks);
> >> + /* Couldn't create that file. Abort. */
> >> + retval = UNTAR_FAIL;
> >> + break;
> >> } else {
> >> for (i = 0; i < ctx.nblocks; i++) {
> >> n = read(fd, bufr, 512);
> >> diff --git a/testsuites/libtests/tar01/init.c b/testsuites/libtests/tar01/init.c
> >> index 4cad67a6ae..2deff3a482 100644
> >> --- a/testsuites/libtests/tar01/init.c
> >> +++ b/testsuites/libtests/tar01/init.c
> >> @@ -7,6 +7,33 @@
> >> * http://www.rtems.org/license/LICENSE.
> >> */
> >>
> >> +/*
> >> + * Note on the used tar file: Generate the file on a system that supports
> >> + * symlinks with the following commands (tested on Linux - you might have to
> >> + * adapt on other systems):
> >> + *
> >> + * export WORK=some_work_directory
> >> + * rm -r ${WORK}
> >> + * mkdir -p ${WORK}/home/abc/def
> >> + * mkdir -p ${WORK}/home/dir
> >> + * cd ${WORK}
> >> + * echo "#! joel" > home/abc/def/test_script
> >> + * echo "ls -las /dev" >> home/abc/def/test_script
> >> + * chmod 755 home/abc/def/test_script
> >> + * echo "This is a test of loading an RTEMS filesystem from an" > home/test_file
> >> + * echo "initial tar image." >> home/test_file
> >> + * echo "Hello world" >> home/dir/file
> >> + * ln -s home/test_file symlink
> >> + * tar cf tar01.tar --format=ustar \
> >> + * symlink \
> >> + * home/test_file \
> >> + * home/abc/def/test_script \
> >> + * home/dir
> >> + *
> >> + * Note that "home/dir" is in the archive as separate directory. "home/abc" is
> >> + * only in the archive as a parent of the file "test_script".
> >> + */
> >> +
> >> #ifdef HAVE_CONFIG_H
> >> #include "config.h"
> >> #endif
> >> @@ -95,6 +122,84 @@ void test_untar_from_memory(void)
> >>
> >> }
> >>
> >> +static void assert_file_content(
> >> + const char *name,
> >> + const char *expected_content,
> >> + ssize_t expected_size
> >> +)
> >> +{
> >> + char buf[16];
> >> + int fd;
> >> + int rd;
> >> +
> >> + fd = open(name, O_RDONLY);
> >> + rtems_test_assert( fd >= 0 );
> >> + do {
> >> + rd = read(fd, buf, sizeof(buf));
> >> + rtems_test_assert( rd >= 0 );
> >> + if (rd > 0) {
> >> + rtems_test_assert( expected_size - rd >= 0 );
> >> + rtems_test_assert( memcmp(buf, expected_content, rd) == 0 );
> >> + expected_content += rd;
> >> + expected_size -= rd;
> >> + }
> >> + } while(rd > 0);
> >> + rtems_test_assert( expected_size == 0 );
> >> + close(fd);
> >> +}
> >> +
> >> +static void assert_content_like_expected(void)
> >> +{
> >> + const char *directories[] = {
> >> + "home",
> >> + "home/abc",
> >> + "home/abc/def",
> >> + "home/dir",
> >> + };
> >> + const char *symlinks[] = {
> >> + "symlink",
> >> + };
> >> + const struct {
> >> + const char *name;
> >> + const char *content;
> >> + } files[] = {
> >> + {
> >> + .name = "home/abc/def/test_script",
> >> + .content = "#! joel\nls -las /dev\n",
> >> + }, {
> >> + .name = "home/test_file",
> >> + .content = "This is a test of loading an RTEMS filesystem from an\n"
> >> + "initial tar image.\n",
> >> + }, {
> >> + .name = "home/dir/file",
> >> + .content = "Hello world\n",
> >> + }
> >> + };
> >> + size_t i;
> >> + struct stat st;
> >> +
> >> + for(i = 0; i < RTEMS_ARRAY_SIZE(directories); ++i) {
> >> + lstat(directories[i], &st);
> >> + rtems_test_assert( S_ISDIR(st.st_mode) );
> >> + }
> >> +
> >> + for(i = 0; i < RTEMS_ARRAY_SIZE(symlinks); ++i) {
> >> + lstat(symlinks[i], &st);
> >> + rtems_test_assert( S_ISLNK(st.st_mode) );
> >> + }
> >> +
> >> + for(i = 0; i < RTEMS_ARRAY_SIZE(files); ++i) {
> >> + lstat(files[i].name, &st);
> >> + rtems_test_assert( S_ISREG(st.st_mode) );
> >> +
> >> + assert_file_content(
> >> + files[i].name,
> >> + files[i].content,
> >> + strlen(files[i].content)
> >> + );
> >> + }
> >> +}
> >> +
> >> void test_untar_from_file(void)
> >> {
> >> int fd;
> >> @@ -119,13 +224,105 @@ void test_untar_from_file(void)
> >> rv = chdir( "/dest" );
> >> rtems_test_assert( rv == 0 );
> >>
> >> - /* Untar it */
> >> + /* Case 1: Untar it into empty directory */
> >> rv = Untar_FromFile( "/test.tar" );
> >> printf("Untaring from file - ");
> >> if (rv != UNTAR_SUCCESSFUL) {
> >> printf ("error: untar failed: %i\n", rv);
> >> exit(1);
> >> }
> >> + assert_content_like_expected();
> >> + printf ("successful\n");
> >> +
> >> + /* Case 2: Most files exist */
> >> + rv = unlink("/dest/home/test_file");
> >> + rtems_test_assert( rv == 0 );
> >> +
> >> + rv = Untar_FromFile( "/test.tar" );
> >> + printf("Untar from file into existing structure with one missing file - ");
> >> + if (rv != UNTAR_SUCCESSFUL) {
> >> + printf ("error: untar failed: %i\n", rv);
> >> + exit(1);
> >> + }
> >> + assert_content_like_expected();
> >> + printf ("successful\n");
> >> +
> >> + /* Case 3: An empty directory exists where a file should be */
> >> + rv = unlink("/dest/home/test_file");
> >> + rtems_test_assert( rv == 0 );
> >> + rv = mkdir("/dest/home/test_file", S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
> >> + rtems_test_assert( rv == 0 );
> >> +
> >> + rv = Untar_FromFile( "/test.tar" );
> >> + printf("Untar from file; overwrite empty directory with file - ");
> >> + if (rv != UNTAR_SUCCESSFUL) {
> >> + printf ("error: untar failed: %i\n", rv);
> >> + exit(1);
> >> + }
> >> + assert_content_like_expected();
> >> + printf ("successful\n");
> >> +
> >> + /* Case 4: A file exists where a parent directory should be created */
> >> + rv = unlink("/dest/home/abc/def/test_script");
> >> + rtems_test_assert( rv == 0 );
> >> + rv = unlink("/dest/home/abc/def");
> >> + rtems_test_assert( rv == 0 );
> >> + rv = unlink("/dest/home/abc");
> >> + rtems_test_assert( rv == 0 );
> >> + fd = creat("/dest/home/abc", S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
> >> + rtems_test_assert( fd >= 0 );
> >> + close(fd);
> >> +
> >> + rv = Untar_FromFile( "/test.tar" );
> >> + printf("Untar from file; file exists where parent dir should be created - ");
> >> + if (rv != UNTAR_FAIL) {
> >> + printf ("error: untar didn't fail like expected: %i\n", rv);
> >> + exit(1);
> >> + }
> >> + printf ("expected fail\n");
> >> + /* cleanup so that the next one works */
> >> + rv = unlink("/dest/home/abc");
> >> + rtems_test_assert( rv == 0 );
> >> +
> >> + /* Case 5: A non-empty directory exists where a file should be created */
> >> + rv = unlink("/dest/home/test_file");
> >> + rtems_test_assert( rv == 0 );
> >> + rv = mkdir("/dest/home/test_file", S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
> >> + rtems_test_assert( rv == 0 );
> >> + fd = creat("/dest/home/test_file/file",
> >> + S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
> >> + rtems_test_assert( fd >= 0 );
> >> + close(fd);
> >> +
> >> + rv = Untar_FromFile( "/test.tar" );
> >> + printf("Untar from file; non-empty dir where file should be created - ");
> >> + if (rv != UNTAR_FAIL) {
> >> + printf ("error: untar didn't fail like expected: %i\n", rv);
> >> + exit(1);
> >> + }
> >> + printf ("expected fail\n");
> >> + /* cleanup so that the next one works */
> >> + rv = unlink("/dest/home/test_file/file");
> >> + rtems_test_assert( rv == 0 );
> >> + rv = unlink("/dest/home/test_file");
> >> + rtems_test_assert( rv == 0 );
> >> +
> >> + /* Case 6: A file exists where a directory is explicitly in the archive */
> >> + rv = unlink("/dest/home/dir/file");
> >> + rtems_test_assert( rv == 0 );
> >> + rv = unlink("/dest/home/dir");
> >> + rtems_test_assert( rv == 0 );
> >> + fd = creat("/dest/home/dir", S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
> >> + rtems_test_assert( fd >= 0 );
> >> + close(fd);
> >> +
> >> + rv = Untar_FromFile( "/test.tar" );
> >> + printf("Untar from file; overwrite file with explicit directory - ");
> >> + if (rv != UNTAR_SUCCESSFUL) {
> >> + printf ("error: untar failed: %i\n", rv);
> >> + exit(1);
> >> + }
> >> + assert_content_like_expected();
> >> printf ("successful\n");
> >>
> >> /******************/
> >> diff --git a/testsuites/libtests/tar01/tar01.doc b/testsuites/libtests/tar01/tar01.doc
> >> index 060f98a813..adffdca291 100644
> >> --- a/testsuites/libtests/tar01/tar01.doc
> >> +++ b/testsuites/libtests/tar01/tar01.doc
> >> @@ -20,3 +20,4 @@ directives:
> >> concepts:
> >>
> >> + exercise these routines
> >> ++ check whether existing files are overwritten or not overwritten like expected
> >> diff --git a/testsuites/libtests/tar01/tar01.scn b/testsuites/libtests/tar01/tar01.scn
> >> index 68fa951881..dd72f9517b 100644
> >> --- a/testsuites/libtests/tar01/tar01.scn
> >> +++ b/testsuites/libtests/tar01/tar01.scn
> >> @@ -1,9 +1,24 @@
> >> -*** TAR01 TEST ***
> >> -Untaring from memory - successful
> >> +*** BEGIN OF TEST TAR 1 ***
> >> +*** TEST VERSION: 6.0.0.e1efb4eb8a9d6dd5f6f37dafc9feb0a9e6a888f1
> >> +*** TEST STATE: EXPECTED_PASS
> >> +*** TEST BUILD: RTEMS_POSIX_API
> >> +*** TEST TOOLS: 10.3.1 20210409 (RTEMS 6, RSB ad54d1dd3cf8249d9d39deb1dd28b2f294df062d-modified, Newlib eb03ac1)
> >> +Untaring from memory - untar: memory at 0x11ece8 (10240)
> >> +untar: symlink: home/test_file -> symlink
> >> +untar: file: home/test_file (s:73,m:0644)
> >> +untar: file: home/abc/def/test_script (s:21,m:0755)
> >> +untar: dir: home/dir
> >> +untar: file: home/dir/file (s:12,m:0644)
> >> +successful
> >> ========= /home/test_file =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >>
> >> +========= /home/abc/def/test_script =========
> >> +(0)#! joel
> >> +ls -las /dev
> >> +
> >> + /home/abc/def/test_script: mode: 0755 want: 0755
> >> ========= /symlink =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >> @@ -11,35 +26,58 @@ initial tar image.
> >>
> >> Copy tar image to test.tar
> >> Untaring from file - successful
> >> +Untar from file into existing structure with one missing file - successful
> >> +Untar from file; overwrite empty directory with file - successful
> >> +Untar from file; file exists where parent dir should be created - expected fail
> >> +Untar from file; non-empty dir where file should be created - expected fail
> >> +Untar from file; overwrite file with explicit directory - successful
> >> ========= /dest/home/test_file =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >>
> >> +========= /dest/home/abc/def/test_script =========
> >> +(0)#! joel
> >> +ls -las /dev
> >> +
> >> + /dest/home/abc/def/test_script: mode: 0755 want: 0755
> >> ========= /dest/symlink =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >>
> >>
> >> -Untaring chunks from memory - untar: dir: home
> >> -untar: file: home/test_file (73)
> >> +Untaring chunks from memory - untar: symlink: home/test_file -> symlink
> >> +untar: file: home/test_file (s:73,m:0644)
> >> +untar: file: home/abc/def/test_script (s:21,m:0755)
> >> +untar: dir: home/dir
> >> +untar: file: home/dir/file (s:12,m:0644)
> >> successful
> >> ========= /dest2/home/test_file =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >>
> >> +========= /dest2/home/abc/def/test_script =========
> >> +(0)#! joel
> >> +ls -las /dev
> >> +
> >> + /dest2/home/abc/def/test_script: mode: 0755 want: 0755
> >> ========= /dest2/symlink =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >>
> >>
> >> -Untaring chunks from tgz- untar: dir: home
> >> -untar: file: home/test_file (73)
> >> -successful
> >> +Untaring chunks from tgz - successful
> >> ========= /dest3/home/test_file =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >>
> >> +========= /dest3/home/abc/def/test_script =========
> >> +(0)#! joel
> >> +ls -las /dev
> >> +
> >> + /dest3/home/abc/def/test_script: mode: 0755 want: 0755
> >> ========= /dest3/symlink =========
> >> (0)This is a test of loading an RTEMS filesystem from an
> >> initial tar image.
> >> -*** END OF TAR01 TEST ***
> >> +
> >> +
> >> +*** END OF TEST TAR 1 ***
> >> diff --git a/testsuites/libtests/tar01/tar01.tar b/testsuites/libtests/tar01/tar01.tar
> >> index 6c6952ef183d51a9635c6ebbc8ed0443e8da1725..9874f426d15eb817f270af7dab48fce1f36be848 100644
> >> GIT binary patch
> >> literal 10240
> >> zcmeH}-%i6I6vlhKr#QxI9dtmSz{DGGboUFc)S*yJ=`?$L>C6^qR=rsp<Gzz7G(h<C
> >> z`}hvTjd!+w$%YJ;q9}@tv3w?S_NDAvwvlncWzL0CN at Ofg9c4!ODtI$(O>7sHb!M0)
> >> zu4Aj4w4~*#v9YzfUihOEmBDLUucK+=(e~X&cIDAdf3I>3#2pePlCC}abIuR-=Srnx
> >> zLTn6NXRiNzWh13eQ|B`Z6}g~GTR)Mm>3)85_duQZ;wHAnQ`H2Y8YZ^3$tsSLb;x at C
> >> zWUeP;XoWdWPGIYQ{kWW#rus~^aoO0{_LLKK{x78L^*_tyq5pFx(scp<pHhULu`Vy@
> >> zIT$x_k*=JMl+M8$yxarpA69SuU)p9m;NE`qKVygf=Tb6}ksNSM`=QVL{@?3A+zUJ9
> >> z{h!}|jEisjtC`@)|NApK;LojbF3@{uT#2+lAZH8>0w4eaAOHd&00JNY0w4eaAOHd&
> >> V00JNY0w4eaAOHd&00LtX_yCHOyx{-<
> >>
> >> literal 10240
> >> zcmeI!-)h1z6b5jw`xIyFdh?`zpJ11}*}Ru%Q=2VqM^7F2_Dfp^QXGoV;n)`hsW~ah
> >> z&wOdirZUUUNVhJmGmBXo`<BKrF^5qc^3iwS!>p7d6{RW-lY}|){VG$LubX8ylbi0P
> >> z)9r#;%tlLRb-gYp72{>zRNB_G7t_kAf^jMR;)X`2YHskiRcVF%M^nEEs42)bI=A(X
> >> zbWJa-r{`DdH-;RfGZhtWQ~8d-*49%w@^oY?y)%!&4XzDSIxkT6`PZB6GB?F|4#>8(
> >> zAKm$pmsj+G$dcqJ_uuEhm=z9_N&Z8{afbX~PJDIc{T;nE#syC3!D%7C4?dCQt2zJN
> >> zKsi*-*6*{<d&qz0^Zdi}-}g`R&nYJq4u{jsFDL)}`9JF)kDEgP0uX=z1Rwwb2tWV=
> >> g5P$##AOHafKmY;|fB*y_009U<00Izzz^@5>0Tj at K8~^|S
> >>
> >> --
> >> 2.31.1
> >>
> >> _______________________________________________
> >> devel mailing list
> >> devel at rtems.org
> >> http://lists.rtems.org/mailman/listinfo/devel
>
> --
> --------------------------------------------
> embedded brains GmbH
> Herr Christian MAUDERER
> Dornierstr. 4
> 82178 Puchheim
> Germany
> email: christian.mauderer at embedded-brains.de
> phone: +49-89-18 94 741 - 18
> fax: +49-89-18 94 741 - 08
>
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> Registernummer: HRB 157899
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> Unsere Datenschutzerklärung finden Sie hier:
> https://embedded-brains.de/datenschutzerklaerung/
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