setup

  $ cat >> $HGRCPATH << EOF

  > [extensions]

  > blackbox=

  > mock=$TESTDIR/mockblackbox.py

  > EOF

Helper functions:

  $ cacheexists() {

  >   [ -f .hg/cache/tags2-visible ] && echo "tag cache exists" || echo "no tag cache"

  > }

  $ fnodescacheexists() {

  >   [ -f .hg/cache/hgtagsfnodes1 ] && echo "fnodes cache exists" || echo "no fnodes cache"

  > }

  $ dumptags() {

  >     rev=$1

  >     echo "rev $rev: .hgtags:"

  >     hg cat -r$rev .hgtags

  > }

# XXX need to test that the tag cache works when we strip an old head

# and add a new one rooted off non-tip: i.e. node and rev of tip are the

# same, but stuff has changed behind tip.

Setup:

  $ hg init t

  $ cd t

  $ cacheexists

  no tag cache

  $ fnodescacheexists

  no fnodes cache

  $ hg id

  000000000000 tip

  $ cacheexists

  no tag cache

  $ fnodescacheexists

  no fnodes cache

  $ echo a > a

  $ hg add a

  $ hg commit -m "test"

  $ hg co

  0 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg identify

  acb14030fe0a tip

  $ cacheexists

  tag cache exists

No fnodes cache because .hgtags file doesn't exist

(this is an implementation detail)

  $ fnodescacheexists

  no fnodes cache

Try corrupting the cache

  $ printf 'a b' > .hg/cache/tags2-visible

  $ hg identify

  acb14030fe0a tip

  $ cacheexists

  tag cache exists

  $ fnodescacheexists

  no fnodes cache

  $ hg identify

  acb14030fe0a tip

Create local tag with long name:

  $ T=`hg identify --debug --id`

  $ hg tag -l "This is a local tag with a really long name!"

  $ hg tags

  tip                                0:acb14030fe0a

  This is a local tag with a really long name!     0:acb14030fe0a

  $ rm .hg/localtags

Create a tag behind hg's back:

  $ echo "$T first" > .hgtags

  $ cat .hgtags

  acb14030fe0a21b60322c440ad2d20cf7685a376 first

  $ hg add .hgtags

  $ hg commit -m "add tags"

  $ hg tags

  tip                                1:b9154636be93

  first                              0:acb14030fe0a

  $ hg identify

  b9154636be93 tip

We should have a fnodes cache now that we have a real tag

The cache should have an empty entry for rev 0 and a valid entry for rev 1.

  $ fnodescacheexists

  fnodes cache exists

  $ f --size --hexdump .hg/cache/hgtagsfnodes1

  .hg/cache/hgtagsfnodes1: size=48

  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0010: ff ff ff ff ff ff ff ff b9 15 46 36 26 b7 b4 a7 |..........F6&...|

  0020: 73 e0 9e e3 c5 2f 51 0e 19 e0 5e 1f f9 66 d8 59 |s..../Q...^..f.Y|

Repeat with cold tag cache:

  $ rm -f .hg/cache/tags2-visible .hg/cache/hgtagsfnodes1

  $ hg identify

  b9154636be93 tip

  $ fnodescacheexists

  fnodes cache exists

  $ f --size --hexdump .hg/cache/hgtagsfnodes1

  .hg/cache/hgtagsfnodes1: size=48

  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0010: ff ff ff ff ff ff ff ff b9 15 46 36 26 b7 b4 a7 |..........F6&...|

  0020: 73 e0 9e e3 c5 2f 51 0e 19 e0 5e 1f f9 66 d8 59 |s..../Q...^..f.Y|

And again, but now unable to write tag cache:

#if unix-permissions

  $ rm -f .hg/cache/tags2-visible .hg/cache/hgtagsfnodes1

  $ chmod 555 .hg/cache

  $ hg identify

  b9154636be93 tip

  $ chmod 755 .hg/cache

#endif

Tag cache debug info written to blackbox log

  $ rm -f .hg/cache/tags2-visible .hg/cache/hgtagsfnodes1

  $ hg identify

  b9154636be93 tip

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob> identify

  1970/01/01 00:00:00 bob> writing 48 bytes to cache/hgtagsfnodes1

  1970/01/01 00:00:00 bob> 0/1 cache hits/lookups in * seconds (glob)

  1970/01/01 00:00:00 bob> writing .hg/cache/tags2-visible with 1 tags

  1970/01/01 00:00:00 bob> identify exited 0 after ?.?? seconds (glob)

Failure to acquire lock results in no write

  $ rm -f .hg/cache/tags2-visible .hg/cache/hgtagsfnodes1

  $ echo 'foo:1' > .hg/wlock

  $ hg identify

  b9154636be93 tip

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob> identify

  1970/01/01 00:00:00 bob> not writing .hg/cache/hgtagsfnodes1 because lock held

  1970/01/01 00:00:00 bob> 0/1 cache hits/lookups in * seconds (glob)

  1970/01/01 00:00:00 bob> writing .hg/cache/tags2-visible with 1 tags

  1970/01/01 00:00:00 bob> identify exited 0 after * seconds (glob)

  $ fnodescacheexists

  no fnodes cache

  $ rm .hg/wlock

  $ rm -f .hg/cache/tags2-visible .hg/cache/hgtagsfnodes1

  $ hg identify

  b9154636be93 tip

Create a branch:

  $ echo bb > a

  $ hg status

  M a

  $ hg identify

  b9154636be93+ tip

  $ hg co first

  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ hg id

  acb14030fe0a+ first

  $ hg -v id

  acb14030fe0a+ first

  $ hg status

  M a

  $ echo 1 > b

  $ hg add b

  $ hg commit -m "branch"

  created new head

Creating a new commit shouldn't append the .hgtags fnodes cache until

tags info is accessed

  $ f --size --hexdump .hg/cache/hgtagsfnodes1

  .hg/cache/hgtagsfnodes1: size=48

  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0010: ff ff ff ff ff ff ff ff b9 15 46 36 26 b7 b4 a7 |..........F6&...|

  0020: 73 e0 9e e3 c5 2f 51 0e 19 e0 5e 1f f9 66 d8 59 |s..../Q...^..f.Y|

  $ hg id

  c8edf04160c7 tip

First 4 bytes of record 3 are changeset fragment

  $ f --size --hexdump .hg/cache/hgtagsfnodes1

  .hg/cache/hgtagsfnodes1: size=72

  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0010: ff ff ff ff ff ff ff ff b9 15 46 36 26 b7 b4 a7 |..........F6&...|

  0020: 73 e0 9e e3 c5 2f 51 0e 19 e0 5e 1f f9 66 d8 59 |s..../Q...^..f.Y|

  0030: c8 ed f0 41 00 00 00 00 00 00 00 00 00 00 00 00 |...A............|

  0040: 00 00 00 00 00 00 00 00                         |........|

Merge the two heads:

  $ hg merge 1

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  $ hg id

  c8edf04160c7+b9154636be93+ tip

  $ hg status

  M .hgtags

  $ hg commit -m "merge"

Create a fake head, make sure tag not visible afterwards:

  $ cp .hgtags tags

  $ hg tag last

  $ hg rm .hgtags

  $ hg commit -m "remove"

  $ mv tags .hgtags

  $ hg add .hgtags

  $ hg commit -m "readd"

  $ 

  $ hg tags

  tip                                6:35ff301afafe

  first                              0:acb14030fe0a

Add invalid tags:

  $ echo "spam" >> .hgtags

  $ echo >> .hgtags

  $ echo "foo bar" >> .hgtags

  $ echo "a5a5 invalid" >> .hg/localtags

  $ cat .hgtags

  acb14030fe0a21b60322c440ad2d20cf7685a376 first

  spam

  foo bar

  $ hg commit -m "tags"

Report tag parse error on other head:

  $ hg up 3

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo 'x y' >> .hgtags

  $ hg commit -m "head"

  created new head

  $ hg tags

  .hgtags@75d9f02dfe28, line 2: cannot parse entry

  .hgtags@75d9f02dfe28, line 4: node 'foo' is not well formed

  .hgtags@c4be69a18c11, line 2: node 'x' is not well formed

  tip                                8:c4be69a18c11

  first                              0:acb14030fe0a

  $ hg tip

  changeset:   8:c4be69a18c11

  tag:         tip

  parent:      3:ac5e980c4dc0

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     head

Test tag precedence rules:

  $ cd ..

  $ hg init t2

  $ cd t2

  $ echo foo > foo

  $ hg add foo

  $ hg ci -m 'add foo'      # rev 0

  $ hg tag bar              # rev 1

  $ echo >> foo

  $ hg ci -m 'change foo 1' # rev 2

  $ hg up -C 1

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg tag -r 1 -f bar      # rev 3

  $ hg up -C 1

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo >> foo

  $ hg ci -m 'change foo 2' # rev 4

  created new head

  $ hg tags

  tip                                4:0c192d7d5e6b

  bar                                1:78391a272241

Repeat in case of cache effects:

  $ hg tags

  tip                                4:0c192d7d5e6b

  bar                                1:78391a272241

Detailed dump of tag info:

  $ hg heads -q             # expect 4, 3, 2

  4:0c192d7d5e6b

  3:6fa450212aeb

  2:7a94127795a3

  $ dumptags 2

  rev 2: .hgtags:

  bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar

  $ dumptags 3

  rev 3: .hgtags:

  bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar

  bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar

  78391a272241d70354aa14c874552cad6b51bb42 bar

  $ dumptags 4

  rev 4: .hgtags:

  bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar

Dump cache:

  $ cat .hg/cache/tags2-visible

  4 0c192d7d5e6b78a714de54a2e9627952a877e25a

  bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar

  bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar

  78391a272241d70354aa14c874552cad6b51bb42 bar

  $ f --size --hexdump .hg/cache/hgtagsfnodes1

  .hg/cache/hgtagsfnodes1: size=120

  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0010: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

  0030: 7a 94 12 77 0c 04 f2 a8 af 31 de 17 fa b7 42 28 |z..w.....1....B(|

  0040: 78 ee 5a 2d ad bc 94 3d 6f a4 50 21 7d 3b 71 8c |x.Z-...=o.P!};q.|

  0050: 96 4e f3 7b 89 e5 50 eb da fd 57 89 e7 6c e1 b0 |.N.{..P...W..l..|

  0060: 0c 19 2d 7d 0c 04 f2 a8 af 31 de 17 fa b7 42 28 |..-}.....1....B(|

  0070: 78 ee 5a 2d ad bc 94 3d                         |x.Z-...=|

Corrupt the .hgtags fnodes cache

Extra junk data at the end should get overwritten on next cache update

  $ echo extra >> .hg/cache/hgtagsfnodes1

  $ echo dummy1 > foo

  $ hg commit -m throwaway1

  $ hg tags

  tip                                5:8dbfe60eff30

  bar                                1:78391a272241

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob> tags

  1970/01/01 00:00:00 bob> writing 24 bytes to cache/hgtagsfnodes1

  1970/01/01 00:00:00 bob> 2/3 cache hits/lookups in * seconds (glob)

  1970/01/01 00:00:00 bob> writing .hg/cache/tags2-visible with 1 tags

  1970/01/01 00:00:00 bob> tags exited 0 after * seconds (glob)

#if unix-permissions no-root

Errors writing to .hgtags fnodes cache are silently ignored

  $ echo dummy2 > foo

  $ hg commit -m throwaway2

  $ chmod a-w .hg/cache/hgtagsfnodes1

  $ rm -f .hg/cache/tags2-visible

  $ hg tags

  tip                                6:b968051b5cf3

  bar                                1:78391a272241

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob> tags

  1970/01/01 00:00:00 bob> couldn't write cache/hgtagsfnodes1: [Errno 13] Permission denied: '$TESTTMP/t2/.hg/cache/hgtagsfnodes1'