tests: fix tar invocation, to address issue 6740

tests/test-issue6528.t

@@ -1,611 +1,611 b''
 ===============================================================
 Test non-regression on the corruption associated with issue6528
 ===============================================================
 
 Setup
 =====
 
   $ hg init base-repo
   $ cd base-repo
 
   $ cat <<EOF > a.txt
   > 1
   > 2
   > 3
   > 4
   > 5
   > 6
   > EOF
 
   $ hg add a.txt
   $ hg commit -m 'c_base_c - create a.txt'
 
 Modify a.txt
 
   $ sed -e 's/1/foo/' a.txt > a.tmp; mv a.tmp a.txt
   $ hg commit -m 'c_modify_c - modify a.txt'
 
 Modify and rename a.txt to b.txt
 
   $ hg up -r "desc('c_base_c')"
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ sed -e 's/6/bar/' a.txt > a.tmp; mv a.tmp a.txt
   $ hg mv a.txt b.txt
   $ hg commit -m 'c_rename_c - rename and modify a.txt to b.txt'
   created new head
 
 Merge each branch
 
   $ hg merge -r "desc('c_modify_c')"
   merging b.txt and a.txt to b.txt
   0 files updated, 1 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ hg commit -m 'c_merge_c: commit merge'
 
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
 
 Check commit Graph
 
   $ hg log -G
   @    changeset:   3:a1cc2bdca0aa
   |\   tag:         tip
   | |  parent:      2:615c6ccefd15
   | |  parent:      1:373d507f4667
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     c_merge_c: commit merge
   | |
   | o  changeset:   2:615c6ccefd15
   | |  parent:      0:f5a5a568022f
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     c_rename_c - rename and modify a.txt to b.txt
   | |
   o |  changeset:   1:373d507f4667
   |/   user:        test
   |    date:        Thu Jan 01 00:00:00 1970 +0000
   |    summary:     c_modify_c - modify a.txt
   |
   o  changeset:   0:f5a5a568022f
      user:        test
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     c_base_c - create a.txt
   
 
   $ hg cat -r . b.txt
   foo
   2
   3
   4
   5
   bar
   $ cat b.txt
   foo
   2
   3
   4
   5
   bar
   $ cd ..
 
 
 Check the lack of corruption
 ============================
 
   $ hg clone --pull base-repo cloned
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 4 changesets with 4 changes to 2 files
   new changesets f5a5a568022f:a1cc2bdca0aa
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd cloned
   $ hg up -r "desc('c_merge_c')"
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 
 Status is buggy, even with debugrebuilddirstate
 
   $ hg cat -r . b.txt
   foo
   2
   3
   4
   5
   bar
   $ cat b.txt
   foo
   2
   3
   4
   5
   bar
   $ hg status
   $ hg debugrebuilddirstate
   $ hg status
 
 the history was altered
 
 in theory p1/p2 order does not matter but in practice p1 == nullid is used as a
 marker that some metadata are present and should be fetched.
 
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
 
 Check commit Graph
 
   $ hg log -G
   @    changeset:   3:a1cc2bdca0aa
   |\   tag:         tip
   | |  parent:      2:615c6ccefd15
   | |  parent:      1:373d507f4667
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     c_merge_c: commit merge
   | |
   | o  changeset:   2:615c6ccefd15
   | |  parent:      0:f5a5a568022f
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     c_rename_c - rename and modify a.txt to b.txt
   | |
   o |  changeset:   1:373d507f4667
   |/   user:        test
   |    date:        Thu Jan 01 00:00:00 1970 +0000
   |    summary:     c_modify_c - modify a.txt
   |
   o  changeset:   0:f5a5a568022f
      user:        test
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     c_base_c - create a.txt
   
 
 Test the command that fixes the issue
 =====================================
 
 Restore a broken repository with multiple broken revisions and a filename that
 would get encoded to test the `report` options.
 It's a tarball because unbundle might magically fix the issue later.
 
   $ cd ..
   $ mkdir repo-to-fix
   $ cd repo-to-fix
-  $ tar -x < $TESTDIR/bundles/issue6528.tar
+  $ tar -xf - < "$TESTDIR"/bundles/issue6528.tar
 
 Check that the issue is present
 (It is currently not present with rhg but will be when optimizations are added
 to resolve ambiguous files at the end of status without reading their content
 if the size differs, and reading the expected size without resolving filelog
 deltas where possible.)
 
   $ hg st
   M D.txt
   M b.txt
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
 
 Dry-run the fix
   $ hg debug-repair-issue6528 --dry-run
   found affected revision 1 for filelog 'data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
   $ hg st
   M D.txt
   M b.txt
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
 
 Test the --paranoid option
   $ hg debug-repair-issue6528 --dry-run --paranoid
   found affected revision 1 for filelog 'data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
   $ hg st
   M D.txt
   M b.txt
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
 
 Run the fix
   $ hg debug-repair-issue6528
   found affected revision 1 for filelog 'data/D.txt.i'
   repaired revision 1 of 'filelog data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
   repaired revision 1 of 'filelog data/b.txt.i'
   repaired revision 3 of 'filelog data/b.txt.i'
 
 Check that the fix worked and that running it twice does nothing
   $ hg st
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
   $ hg debug-repair-issue6528
   no affected revisions were found
   $ hg st
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
 
 Try the using the report options
 --------------------------------
 
   $ cd ..
   $ mkdir repo-to-fix-report
   $ cd repo-to-fix
-  $ tar -x < "$TESTDIR"/bundles/issue6528.tar
+  $ tar -xf - < "$TESTDIR"/bundles/issue6528.tar
 
   $ hg debug-repair-issue6528 --to-report $TESTTMP/report.txt
   found affected revision 1 for filelog 'data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
   $ cat $TESTTMP/report.txt
   2a80419dfc31d7dfb308ac40f3f138282de7d73b D.txt
   a58b36ad6b6545195952793099613c2116f3563b,ea4f2f2463cca5b29ddf3461012b8ce5c6dac175 b.txt
 
   $ hg debug-repair-issue6528 --from-report $TESTTMP/report.txt --dry-run
   loading report file '$TESTTMP/report.txt'
   found affected revision 1 for filelog 'D.txt'
   found affected revision 1 for filelog 'b.txt'
   found affected revision 3 for filelog 'b.txt'
   $ hg st
   M D.txt
   M b.txt
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
 
   $ hg debug-repair-issue6528 --from-report $TESTTMP/report.txt
   loading report file '$TESTTMP/report.txt'
   found affected revision 1 for filelog 'D.txt'
   repaired revision 1 of 'filelog data/D.txt.i'
   found affected revision 1 for filelog 'b.txt'
   found affected revision 3 for filelog 'b.txt'
   repaired revision 1 of 'filelog data/b.txt.i'
   repaired revision 3 of 'filelog data/b.txt.i'
   $ hg st
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
 
 Check that the revision is not "fixed" again
 
   $ hg debug-repair-issue6528 --from-report $TESTTMP/report.txt
   loading report file '$TESTTMP/report.txt'
   revision 2a80419dfc31d7dfb308ac40f3f138282de7d73b of file 'D.txt' is not affected
   no affected revisions were found for 'D.txt'
   revision a58b36ad6b6545195952793099613c2116f3563b of file 'b.txt' is not affected
   revision ea4f2f2463cca5b29ddf3461012b8ce5c6dac175 of file 'b.txt' is not affected
   no affected revisions were found for 'b.txt'
   $ hg st
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
 
 Try it with a non-inline revlog
 -------------------------------
 
   $ cd ..
   $ mkdir $TESTTMP/ext
   $ cat << EOF > $TESTTMP/ext/small_inline.py
   > from mercurial import revlog
   > revlog._maxinline = 8
   > EOF
 
   $ cat << EOF >> $HGRCPATH
   > [extensions]
   > small_inline=$TESTTMP/ext/small_inline.py
   > EOF
 
   $ mkdir repo-to-fix-not-inline
   $ cd repo-to-fix-not-inline
-  $ tar -x < "$TESTDIR"/bundles/issue6528.tar
+  $ tar -xf - < "$TESTDIR"/bundles/issue6528.tar
   $ echo b >> b.txt
   $ hg commit -qm "inline -> separate"
   $ find .hg -name *b.txt.d
   .hg/store/data/b.txt.d
 
 Status is correct, but the problem is still there, in the earlier revision
   $ hg st
   $ hg up 3
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ hg st
   M b.txt
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
        4       8 db234885e2fe ea4f2f2463cc 000000000000
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
        2       8 65aecc89bb5d 2a80419dfc31 000000000000
 
 Run the fix on the non-inline revlog
   $ hg debug-repair-issue6528
   found affected revision 1 for filelog 'data/D.txt.i'
   repaired revision 1 of 'filelog data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
   repaired revision 1 of 'filelog data/b.txt.i'
   repaired revision 3 of 'filelog data/b.txt.i'
 
 Check that it worked
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
        4       8 db234885e2fe ea4f2f2463cc 000000000000
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
        2       8 65aecc89bb5d 2a80419dfc31 000000000000
   $ hg debug-repair-issue6528
   no affected revisions were found
   $ hg st
 
   $ cd ..
 
 Applying a bad bundle should fix it on the fly
 ----------------------------------------------
 
 from a v1 bundle
 ~~~~~~~~~~~~~~~~
 
   $ hg debugbundle  --spec "$TESTDIR"/bundles/issue6528.hg-v1
   bzip2-v1
 
   $ hg init unbundle-v1
   $ cd unbundle-v1
 
   $ hg unbundle "$TESTDIR"/bundles/issue6528.hg-v1
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 12 changes to 4 files
   new changesets f5a5a568022f:3beabb508514 (8 drafts)
   (run 'hg update' to get a working copy)
 
 Check that revision were fixed on the fly
 
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
 
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
 
 That we don't see the symptoms of the bug
 
   $ hg up -- -1
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg status
 
 And that the repair command does not find anything to fix
 
   $ hg debug-repair-issue6528
   no affected revisions were found
 
   $ cd ..
 
 from a v2 bundle
 ~~~~~~~~~~~~~~~~
 
   $ hg debugbundle --spec "$TESTDIR"/bundles/issue6528.hg-v2
   bzip2-v2
 
   $ hg init unbundle-v2
   $ cd unbundle-v2
 
   $ hg unbundle "$TESTDIR"/bundles/issue6528.hg-v2
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 12 changes to 4 files
   new changesets f5a5a568022f:3beabb508514 (8 drafts)
   (run 'hg update' to get a working copy)
 
 Check that revision were fixed on the fly
 
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 000000000000 05b806ebe5ea
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 000000000000 216a5fe8b8ed
 
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 000000000000 2a8d3833f2fb
 
 That we don't see the symptoms of the bug
 
   $ hg up -- -1
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg status
 
 And that the repair command does not find anything to fix
 
   $ hg debug-repair-issue6528
   no affected revisions were found
 
   $ cd ..
 
 A config option can disable the fixing of the bad bundle on the fly
 -------------------------------------------------------------------
 
 
 
 from a v1 bundle
 ~~~~~~~~~~~~~~~~
 
   $ hg debugbundle  --spec "$TESTDIR"/bundles/issue6528.hg-v1
   bzip2-v1
 
   $ hg init unbundle-v1-no-fix
   $ cd unbundle-v1-no-fix
 
   $ hg unbundle "$TESTDIR"/bundles/issue6528.hg-v1 --config storage.revlog.issue6528.fix-incoming=no
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 12 changes to 4 files
   new changesets f5a5a568022f:3beabb508514 (8 drafts)
   (run 'hg update' to get a working copy)
 
 Check that revision were not fixed on the fly
 
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
 
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
 
 That we do see the symptoms of the bug
 
   $ hg up -- -1
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg status
   M D.txt (?)
   M b.txt (?)
 
 And that the repair command find issue to fix.
 
   $ hg debug-repair-issue6528 --dry-run
   found affected revision 1 for filelog 'data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
 
   $ cd ..
 
 from a v2 bundle
 ~~~~~~~~~~~~~~~~
 
   $ hg debugbundle --spec "$TESTDIR"/bundles/issue6528.hg-v2
   bzip2-v2
 
   $ hg init unbundle-v2-no-fix
   $ cd unbundle-v2-no-fix
 
   $ hg unbundle "$TESTDIR"/bundles/issue6528.hg-v2 --config storage.revlog.issue6528.fix-incoming=no
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 12 changes to 4 files
   new changesets f5a5a568022f:3beabb508514 (8 drafts)
   (run 'hg update' to get a working copy)
 
 Check that revision were not fixed on the fly
 
   $ hg debugrevlogindex b.txt
      rev linkrev nodeid       p1           p2
        0       2 05b806ebe5ea 000000000000 000000000000
        1       3 a58b36ad6b65 05b806ebe5ea 000000000000
        2       6 216a5fe8b8ed 000000000000 000000000000
        3       7 ea4f2f2463cc 216a5fe8b8ed 000000000000
 
   $ hg debugrevlogindex D.txt
      rev linkrev nodeid       p1           p2
        0       6 2a8d3833f2fb 000000000000 000000000000
        1       7 2a80419dfc31 2a8d3833f2fb 000000000000
 
 That we do see the symptoms of the bug
 
   $ hg up -- -1
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg status
   M D.txt (?)
   M b.txt (?)
 
 And that the repair command find issue to fix.
 
   $ hg debug-repair-issue6528 --dry-run
   found affected revision 1 for filelog 'data/D.txt.i'
   found affected revision 1 for filelog 'data/b.txt.i'
   found affected revision 3 for filelog 'data/b.txt.i'
 
   $ cd ..

tests/test-revlog.t

@@ -1,89 +1,89 b''
   $ hg init empty-repo
   $ cd empty-repo
 
 Flags on revlog version 0 are rejected
 
   >>> with open('.hg/store/00changelog.i', 'wb') as fh:
   ...     fh.write(b'\x00\x01\x00\x00') and None
 
   $ hg log
   abort: unknown flags (0x01) in version 0 revlog 00changelog
   [50]
 
 Unknown flags on revlog version 1 are rejected
 
   >>> with open('.hg/store/00changelog.i', 'wb') as fh:
   ...     fh.write(b'\x00\x04\x00\x01') and None
 
   $ hg log
   abort: unknown flags (0x04) in version 1 revlog 00changelog
   [50]
 
 Unknown version is rejected
 
   >>> with open('.hg/store/00changelog.i', 'wb') as fh:
   ...     fh.write(b'\x00\x00\xbe\xef') and None
 
   $ hg log
   abort: unknown version (48879) in revlog 00changelog
   [50]
 
   $ cd ..
 
 Test for CVE-2016-3630
 
   $ mkdir test2; cd test2
   $ hg init
 
   >>> import codecs
   >>> open("a.i", "wb").write(codecs.decode(codecs.decode(
   ... b"""eJxjYGZgZIAAYQYGxhgom+k/FMx8YKx9ZUaKSOyqo4cnuKb8mbqHV5cBCVTMWb1Cwqkhe4Gsg9AD
   ... Joa3dYtcYYYBAQ8Qr4OqZAYRICPTSr5WKd/42rV36d+8/VmrNpv7NP1jQAXrQE4BqQUARngwVA==""",
   ... "base64"), "zlib")) and None
 
   $ hg debugrevlogindex a.i
      rev linkrev nodeid       p1           p2
        0       2 99e0332bd498 000000000000 000000000000
        1       3 6674f57a23d8 99e0332bd498 000000000000
 
   >>> from mercurial.revlogutils.constants import KIND_OTHER
   >>> from mercurial import revlog, vfs
   >>> tvfs = vfs.vfs(b'.')
   >>> tvfs.options = {b'revlogv1': True}
   >>> rl = revlog.revlog(tvfs, target=(KIND_OTHER, b'test'), radix=b'a')
   >>> rl.revision(1)
   mpatchError(*'patch cannot be decoded'*) (glob)
 
   $ cd ..
 
 
 Regression test for support for the old repos with strange diff encoding.
 Apparently it used to be possible (maybe it's still possible, but we don't know how)
 to create commits whose diffs are encoded relative to a nullrev.
 This test checks that a repo with that encoding can still be read.
 
 This is what we did to produce the repo in test-revlog-diff-relative-to-nullrev.tar:
 
 - tweak the code in mercurial/revlogutils/deltas.py to produce such "trivial" deltas:
 >          if deltainfo is None:
 > -            deltainfo = self._fullsnapshotinfo(fh, revinfo, target_rev)
 > +            deltainfo = self._builddeltainfo(revinfo, nullrev, fh)
 - hg init
 - echo hi > a
 - hg commit -Am_
 - remove some cache files
 
-  $ tar -x < "$TESTDIR"/bundles/test-revlog-diff-relative-to-nullrev.tar
+  $ tar -xf - < "$TESTDIR"/bundles/test-revlog-diff-relative-to-nullrev.tar
   $ cd nullrev-diff
   $ hg debugdeltachain a
       rev      p1      p2  chain# chainlen     prev   delta       size    rawsize  chainsize     ratio   lindist extradist extraratio   readsize largestblk rddensity srchunks
         0      -1      -1       1        2       -1      p1         15          3         15   5.00000        15         0    0.00000         15         15   1.00000        1
         1       0      -1       1        2       -1      p2         15          3         15   5.00000        30        15    1.00000         30         30   0.50000        1
         2      -1      -1       1        2       -1      p1         15          3         15   5.00000        45        30    2.00000         45         45   0.33333        1
   $ hg cat --config rhg.cat=true -r 0 a
   hi
   $ hg cat --config rhg.cat=true -r 1 a
   ho
   $ hg cat --config rhg.cat=true -r 2 a
   ha
   $ cd ..