tests: collapse elif PYTHON3 block PYTHON3 is always True now so this logic should be identical as to before. Differential Revision: https://phab.mercurial-scm.org/D12236

tests: collapse some more trivial if PYTHON3 blocks This doesn't account for all of the references to PYTHON3. But it accounts for the ones that are more trivial and don't entail logical changes. Differential Revision: https://phab.mercurial-scm.org/D12235

tests: require Python 3.5+ in run-tests.py We change the version check logic to hard fail if running on <= 3.5.0. The branch for <3.5 has been deleted. And the >=3.5 branch block has been dedented. Differential Revision: https://phab.mercurial-scm.org/D12234

revlog: use rust rank computation if available Differential Revision: https://phab.mercurial-scm.org/D12212

rust: expose rank computation function to python Differential Revision: https://phab.mercurial-scm.org/D12211

rust: implement vcsgraph::RankedGraph for Index Differential Revision: https://phab.mercurial-scm.org/D12210

revlog: implement fast_rank retrieval in C This will be useful in particular to avoid going through the Python interpreter in native Rust functions. Differential Revision: https://phab.mercurial-scm.org/D12209

revlog: return 0 for the fast_rank of nullrev By convention, the rank of the null revision is 0. This particular revision is never "physically" stored in the changelog, so it is a special case. For consistency, the value `None` is still being returned for revlogs which do not store the fast_rank property for any revision. Differential Revision: https://phab.mercurial-scm.org/D12208

setup: drop support for Python 3.5 We talked about this on the mailing list [1] and there seemed to be agreement that Python 3.5 is effectively dead and no longer worth supporting. So this commit changes our minimum version requirement to 3.6.2. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2022-February/147885.html Differential Revision: https://phab.mercurial-scm.org/D12315

packaging: remove requirements constraints to support Python 2 We just deleted support for Python 2 from the packaging code. We no longer need these package constraints in the requirements file to support Python 2. Differential Revision: https://phab.mercurial-scm.org/D12267

packaging: remove py2exe / Python 2.7 support This commit started by deleting references to py2exe (which is only used on Python 2). After pulling the thread, quite a lot of code was orphaned and was deleted. Differential Revision: https://phab.mercurial-scm.org/D12265

automation: delete code related to Python 2.7 support The building of Inno and WiX installers took a python_version argument that allowed us to specify "2" or "3" for the major Python version. Since we no longer support Python 2, we can delete this argument and everything feeding into it. Differential Revision: https://phab.mercurial-scm.org/D12264

automation: drop support for Python 2.7 in Windows environment We stop installing Python 2.7 in the Windows environment. We remove support for building Python 2.7 wheels and installers. There is still some Python 2.7 support cleanup to perform in automation. But this removes the biggest remaining chunk of references to 2.7. Differential Revision: https://phab.mercurial-scm.org/D12263

automation: drop support for Python 2.7 in Linux environment We stop installing Python 2.7 via pyenv. We stop installing the system Python 2 packages. We delete support for running tests on Python 2.7. Differential Revision: https://phab.mercurial-scm.org/D12262

automation: make system3 the default for run-tests-linux We'll soon drop support for Python 2.7. Let's use Python 3 by default. Differential Revision: https://phab.mercurial-scm.org/D12261

automation: run hg with python3 Python 2.7 support will go away soon. Let's use Python 3 as part of the automation. Differential Revision: https://phab.mercurial-scm.org/D12260

rust: enable Python 3 support unconditionally Note: `cpython/python3-sys` is a default feature. Differential Revision: https://phab.mercurial-scm.org/D12316

cext: really remove Python 2 file handling code Disclaimer: This is _WIN32 code and I have no machine to test.

cext: backout e9ca736f5b52 "remove Python 2 file handling code" It's if"n"def.

rust: jettison Python 2 support Differential Revision: https://phab.mercurial-scm.org/D12283

setup: always decode xcode version Not decoding was a Python 2 thing. Differential Revision: https://phab.mercurial-scm.org/D12282

setup: remove Rust support for Python 2 Differential Revision: https://phab.mercurial-scm.org/D12281

cleanup: stop bundling concurrent.futures on Python 2 We no longer support Python 2. Differential Revision: https://phab.mercurial-scm.org/D12280

cleanup: directly use concurrent.futures instead of via pycompat Python 2 is gone. Differential Revision: https://phab.mercurial-scm.org/D12279

imports: allow importing futures from concurrent Differential Revision: https://phab.mercurial-scm.org/D12278

setup: remove pygit2 Python 2 logic Differential Revision: https://phab.mercurial-scm.org/D12277

setup: inline now-constant list This varied when we supported Python 2. Differential Revision: https://phab.mercurial-scm.org/D12276

setup: unconditionally do this python 3 step Differential Revision: https://phab.mercurial-scm.org/D12275

setup: remove Python 2 support code for determining dylib suffix Differential Revision: https://phab.mercurial-scm.org/D12274

setup: inline os.fsdecode now that we're done with Python 2 Differential Revision: https://phab.mercurial-scm.org/D12273

setup: inline encoding constant that is only used once This was variable back when we supported Python 2. Differential Revision: https://phab.mercurial-scm.org/D12272

setup: remove printf trampoline Differential Revision: https://phab.mercurial-scm.org/D12271

setup: remove more Python 2 support code I'll inline print() etc in future patches. Differential Revision: https://phab.mercurial-scm.org/D12270

setup: remove ssl check that only matters on 2.7 Differential Revision: https://phab.mercurial-scm.org/D12269

setup: remove block that tries to help Python 2.6 users It's time to move on folks. Differential Revision: https://phab.mercurial-scm.org/D12268

setup: drop statement of support for Python before 3.5.3 🎉🎉 Differential Revision: https://phab.mercurial-scm.org/D12266

cext: remove inline rewriting of argv This only worked on Python 2. And since we dropped support for Python 2, we can drop support for this functionality. Differential Revision: https://phab.mercurial-scm.org/D12233

cext: remove PY23() Since we always run on Python 3 now, we no longer need this macro to support Python 2. We refactor all users to just use the 2nd argument. Differential Revision: https://phab.mercurial-scm.org/D12232

cext: unconditionalize PySlice_GetIndicesEx() We only support Python 3 now. Differential Revision: https://phab.mercurial-scm.org/D12231

cext: unconditionalize PYLONG_VALUE() We only support Python 3 now. Differential Revision: https://phab.mercurial-scm.org/D12230

cext: use PyLong symbols We no longer support Python 2. So we can unconditionally use the Python 3 symbol names. Differential Revision: https://phab.mercurial-scm.org/D12229

cext: use PyLong symbols We no longer need to support Python 2. So use the Python 3 symbol names directly. Differential Revision: https://phab.mercurial-scm.org/D12228

cext: remove Python 2 support We still alias the Python 2 symbols. This will be cleaned up in a separate commit. Differential Revision: https://phab.mercurial-scm.org/D12227

cext: remove Python 2 file handling code Differential Revision: https://phab.mercurial-scm.org/D12226

cext: remove Python 2 variant of listdir_slot() Differential Revision: https://phab.mercurial-scm.org/D12225

cext: remove some conditional preprocessor defines We may want to inline these defines. But for now, getting rid of the Python 2 support is a step forward. Differential Revision: https://phab.mercurial-scm.org/D12224

cext: unconditionally use PyLong_FromLong() We no longer support Python 2. Differential Revision: https://phab.mercurial-scm.org/D12223

cext: drop preprocessor PyInt aliases Now that we dropped support for Python 2 we can use the Python 3 native functions. Differential Revision: https://phab.mercurial-scm.org/D12222

cext: remove Python 2 module initializer functions We no longer need these since we dropped support for Python 2. Differential Revision: https://phab.mercurial-scm.org/D12221

rhg: simplify the handling of share-safe config mismatch Differential Revision: https://phab.mercurial-scm.org/D12213

branching: merge stable into default

Added signature for changeset d4486810a179

Added tag 6.1 for changeset d4486810a179

merge: remove direct rustmod reference We shouldn't rely on this member being present in `dirstate.py`, this creates unnecessary coupling. This also can trigger certain issues in edge-cases where the policy is changed at runtime or multiple Python environments fight, which is an added bonus. Differential Revision: https://phab.mercurial-scm.org/D12217

relnotes: add 6.1 Differential Revision: https://phab.mercurial-scm.org/D12205

relnotes: add 6.0.3 Differential Revision: https://phab.mercurial-scm.org/D12204

windows: adjust test output in test-merge-tools.t Differential Revision: https://phab.mercurial-scm.org/D12216

windows: generalize output for test-status-tracked-key.t Differential Revision: https://phab.mercurial-scm.org/D12215

windows: skip a section of a test that is legitimately broken on windows See the comment in the test itself. Differential Revision: https://phab.mercurial-scm.org/D12214

heptapod-ci: remove Python 2 support (hurray!) 6.1 was the last release to support Python 2, let's lighten the CI. Differential Revision: https://phab.mercurial-scm.org/D12206

Added signature for changeset c00d3ce4e94b

Added tag 6.1rc0 for changeset c00d3ce4e94b

branching: merge default into stable for 6.1 freeze

branching: merge 6.0.3 stable into default

branching: merge stable into default

tracked-key: remove the dual write and rename to tracked-hint The dual-write approach was mostly useless. As explained in the previous version of the help, the key had to be read twice before we could cache a value. However this "read twice" limitation actually also apply to any usage of the key. If some operation wants to rely of the "same value == same tracked set" property it would need to read the value before, and after running that operation (or at least, after, in all cases). So it cannot be sure the operation it did is "valid" until checking the key after the operation. As a resultat such operation can only be read-only or rollbackable. This reduce the utility of the "same value == same tracked set" a lot. So it seems simpler to drop the double write and to update the documentation to highlight that this file does not garantee race-free operation. As a result the "key" is demoted to a "hint". Documentation is updated accordingly. Differential Revision: https://phab.mercurial-scm.org/D12201

tracked-file: rename the format option to use `use-` This is more consistent with the other options. Differential Revision: https://phab.mercurial-scm.org/D12200

tracked-key: update the requirement value We renamed the config option but we forgot to change the actual value… Differential Revision: https://phab.mercurial-scm.org/D12199

tracked-key: make it possible to upgrade to and downgrade from the feature This seems rather important if we want people to start using it. Differential Revision: https://phab.mercurial-scm.org/D12198

obsolete: don't use os.stat in repo.obsstore.__nonzero__ if it's static HTTP If a repo is accessed via static HTTP, then we obviously can't use os.stat() to just peek at the file size. Let's download the entire file to check its size. Yes, this feels wasteful, but: 1. If we're cloning or pulling a repo from a static HTTP server, we need the contents of the obsstore anyway. 2. Implementing statichttpvfs.stat() that uses HEAD will result in one more request to a static-only HTTP server, which is already slow. Also parsing a response to a HEAD request to construct os.stat_result is pretty hacky. There's also a question of the remote server properly supporting HEAD method and reporting at least file size. 3. Implementing statichttpvfs.stat() that uses GET is pretty much the same thing as we do here, except we can't even cache the response easily, unlike simply accessing obsstore._data, which is @propertycache'd. Importing statichttprepo locally to avoid circular import. See also: 4507bc001365 and commit message of f8f2ecdde4b5. Differential Revision: https://phab.mercurial-scm.org/D12195

filemerge: make `_maketempfiles()` more reusable `_maketempfiles()` is very specialized for its current use. I hope to use it also when creating temporary files for input for tools that do partial conflict resolution. That'll be possible if the function is more generic. Instead of passing in two contexts (for "other" and "base") and an optional path (for "local"), let's pass a single list of files to make backups for. Even if we don't end up using for partial conflict resolution, this is still a simplification (but I do have a WIP patch for partial conflict resolution and it is able to benefit from this). Differential Revision: https://phab.mercurial-scm.org/D12193

filemerge: reduce some duplication in `_maketempfiles()` The two callers of the local `maketempfrompath()` function used the returned file object in the same way. We can reduce duplication by moving that code into the function. Differential Revision: https://phab.mercurial-scm.org/D12192

filemerge: use leverage `util.readfile()` in `_maketempfiles()` Differential Revision: https://phab.mercurial-scm.org/D12191

filemerge: move removal of `.orig` extension on temp file close to context The place where the `.orig` extension is removed in `_maketempfiles()` doesn't make it clear that it's the backup path, which is why we have a comment in the code explaining it. Let's instead move it out of the function and close to where we get it from `backup.path()`, so that becomes clear. Differential Revision: https://phab.mercurial-scm.org/D12190

filemerge: remove `uselocalpath` argument from `_maketempfiles()` The `localpath` argument is unused if `uselocalpath` is false, so we can use `None` as a sentinel value for the variable instead and remove extra `uselocalpath` argument. That's not much of a win, but it's a small step towards further improvements. Differential Revision: https://phab.mercurial-scm.org/D12189

filemerge: remove an unnecessary join with absolute path The `backup` path is now always absolute, so we don't need to join it with the working copy path. Differential Revision: https://phab.mercurial-scm.org/D12188

filemerge: when using in-memory merge, always put backup files in temp dir Before calling a merge tool, we create a backup of the local side of the merge. That file can be put in the working copy or in a temporary directory, depending on the user's config. When we're merging in memory, we don't want to write to the actual, on-disk working copy, so we write the file to the in-memory working copy instead. However, since we don't support external merge tools with in-memory merge, it makes no difference where the file is actually stored (and if we ever do add support for external merge tools, then the file clearly can't live in the in-memory working-copy object anyway). So, since it doesn't matter where the file is stored, we can simplify by always putting them in the system's temp directory. Differential Revision: https://phab.mercurial-scm.org/D12187

filemerge: remove unused `repo` argument from `_maketempfiles()` I missed this in D12171. Differential Revision: https://phab.mercurial-scm.org/D12194

upgrade: make dirstate-v2 format variant compatible with share This only affects the dirstate and is safe to upgrade in the share. Differential Revision: https://phab.mercurial-scm.org/D12197

upgrade: prepare code (and output) for the idea of upgrading share This would work for a subset of action only. Our first target is dirstate-v2. Differential Revision: https://phab.mercurial-scm.org/D12196

sparse: add timing block for parsing sparse configs This was showing up in an operation I was doing today, and I'd like to be able to get trace spans for it instead of just profiler samples. Differential Revision: https://phab.mercurial-scm.org/D12186

narrowspec: add timing block for validating narrowspec This was showing up in an operation I was doing today, and I'd like to be able to get trace spans for it instead of just profiler samples. Differential Revision: https://phab.mercurial-scm.org/D12185

Added signature for changeset dcec16e799dd

Added tag 6.0.3 for changeset dcec16e799dd

status: fix hg status race against file deletion Differential Revision: https://phab.mercurial-scm.org/D12202

branching: merge with stable

filemerge: put temporary files in single temp dir by default The feature introduced in D2888 seems like a pure improvement to me. It makes the names' of temporary file easier to read. Let's have it always enabled. I also removed the config option for the path prefix because it doesn't seem useful. I asked Kyle (the author of the feature) about it and he couldn't think of a reason to keep it. I suspect it was just that we to have a config to turn it on/off while it was experimental, so it might as well be a configurable prefix then. Differential Revision: https://phab.mercurial-scm.org/D12171

dirstate-tracked-key: update the config value to match latest discussion Special cases are not special enough, we align the option name on the other. The `version` value is undocumented for now as it can only have a single value. It is supported in the code to properly detect and abort if more value are introduced in the future value. Differential Revision: https://phab.mercurial-scm.org/D12184

rhg: signal when falling back in logs We use the `trace` level for the actual message because it can get really busy. Differential Revision: https://phab.mercurial-scm.org/D11814

revlog: register changelogv2 C implementation in parsers This allows Python code to make use of the C implementation of the changelogv2 base operations when the C extensions are enabled. The `format_version` values are now shared between the C and Python sides, avoiding an additional translation for the selection of the format version to use. Differential Revision: https://phab.mercurial-scm.org/D12179

revlog: implement changelogv2 packing and unpacking in C This introduces a C implementation of changelogv2 records packing and unpacking operations matching the pure Python counterpart, similarly to what we already have for revlogv1 and revlogv2. This is also necessary to access changelogv2 record fields from future Rust code without going through the Python part, which would annihilate any performance benefit. Differential Revision: https://phab.mercurial-scm.org/D12178

revlog: memset whole record instead of dealing with padding This is less error-prone. Differential Revision: https://phab.mercurial-scm.org/D12177

revlog: do not compute node location by hand in index_invalidate_added The node is not guaranteed to be at the same location all the time (e.g: changelog v2), so let's use the official existing API to get that value. Differential Revision: https://phab.mercurial-scm.org/D12176

rank: compute property incrementally This replaces the naive rank computation with a more efficient incremental method, avoiding computing the whole ancestor set when possible. Differential Revision: https://phab.mercurial-scm.org/D12143

rank: add test with golden values This adds a regression test for the computation of the rank, using the current values computed with the naive algorithm as the "golden" reference. Differential Revision: https://phab.mercurial-scm.org/D12142

rank: add minimal test This adds a small test checking the rank computation in the case of a merge. Differential Revision: https://phab.mercurial-scm.org/D12141

rank: add context and template keyword This makes the stored rank property accessible, to be expanded and printed. Differential Revision: https://phab.mercurial-scm.org/D12140

rank: naive rank property computation and retrieval This stores the rank (size of the ancestor set of a revision, including itself) in a changelog field and allows this property to be retrieved. This new property is used as part of stable-range computations, which will be introduced later on. The value is computed in a naive way from the definition of the rank. This will be replaced by a more efficient version subsequently. Differential Revision: https://phab.mercurial-scm.org/D12139

filemerge: move check for identical sides out of filemerge() `filemerge.filemerge()` returns `None` if no merge was necessary because the two sides were identical. I don't think it should be that function's responsibility to handle that case; we should ideally not even call `filemerge.filemerge()` if the two inputs identical. This patch therefore moves the check out to the caller (`mergestate.py`). The largefiles test changed because we now notice that the two sides made the same change, so we don't consider it a merge. Also note that the new message better matches the line above it in the test output. Differential Revision: https://phab.mercurial-scm.org/D12154

mergestate: use an early return for trivial merges `filemerge.filemerge()` returns `None` if no merge was needed because the two sides were identical. I'd like to move that to the caller. This is a little refactoring to prepare for that. Differential Revision: https://phab.mercurial-scm.org/D12153

simplemerge: remove now-unused arguments The `ui` argument is no longer needed now that we don't handle `--print` in the library code. Differential Revision: https://phab.mercurial-scm.org/D12151

merge: fix documented order of `labels` argument Differential Revision: https://phab.mercurial-scm.org/D12150

filemerge: when not keeping premerge, don't write markers to context When premerge is enabled (as it is for non-binary inputs by default) and the markers are not kept, we currently still write it to the output context and then restore the previous content right after. With the refactoring in the previous patch, we can easily avoid that step and instead write the output in the opposite case (i.e. when it's successful or when the markers are supposed to be kept). Differential Revision: https://phab.mercurial-scm.org/D12149

simplemerge: move printing of merge result to extension The `mercurial.simplemerge` module still has some command-lines processing that doesn't belong in such a low-level module. This patch moves the handling of `hg simplemerge --print` to the extension by having `mercurial.simplemerge.simplemerge()` return the merged text. Differential Revision: https://phab.mercurial-scm.org/D12148

simplemerge: remove code for checking binary input now that callers do it The callers now do the checking for binary inputs and handle warnings and/or errors, so we can remove that code from the low-level `simplemerge` module now. After this patch we just raise an error unless the caller told us to allow binary inputs. Differential Revision: https://phab.mercurial-scm.org/D12169

simplemerge: let filemerge check for binary inputs This is similar to the previous patch, but here we put a specialized copy of `simplemerge._verifytext()` in the the `filemerge` module instead. Differential Revision: https://phab.mercurial-scm.org/D12147

simplemerge: let extension check for binary inputs (unless `--text`) The `simplemerge` module does too much UI-related things. This patch puts a specialized copy of `simplemerge._verifytext()` in the simplemerge extension. Differential Revision: https://phab.mercurial-scm.org/D12146

simplemerge: store input data in MergeInput I want to be able to update the file contents for support for partial conflict resolution. Having the text available (and later settable) on `MergeInput` will enable that. Differential Revision: https://phab.mercurial-scm.org/D12144

simplemerge: convert MergeInput to regular, non-attr.ib class I'm about to add more logic and state to it. Differential Revision: https://phab.mercurial-scm.org/D12145

simplemerge: replace `**opts` passed to `simplemerge()` by keyword arguments The `simplemerge` module is library code; it should not get an unmodified `opts` dict from the `simplemerge` extension. Differential Revision: https://phab.mercurial-scm.org/D12152

automation: use gp3 volume type This is a newer volume type. It offers a better baseline of performance by default and is ~10% cheaper. It doesn't offer burst credits. But its performance is guaranteed, unlike gp2, which had wonky performance behavior. Differential Revision: https://phab.mercurial-scm.org/D12132

automation: use m6i instances This instance type is much, much faster than t3 and can perform tasks much quicker. Differential Revision: https://phab.mercurial-scm.org/D12131

narrow: add support for merging add and remove outside of the tracked set This extend f1eb77dceb36 to test and support the remaining action. Or, at least, the simple incarnation of them. Differential Revision: https://phab.mercurial-scm.org/D12181

status: prefer relative paths in Rust code … when the repository root is under the current directory, so the kernel needs to traverse fewer directory in every call to `read_dir` or `symlink_metadata`. Better yet would be to use libc functions like `openat` and `fstatat` to remove such repeated traversals entirely, but the standard library does not provide APIs based on those. Maybe with a crate like https://crates.io/crates/openat instead? Benchmarks of `rhg status` show that this patch is neutral in some configurations, and makes the command up to ~20% faster in others. Below is semi-arbitrary subset of results. The four numeric columns are: time (in seconds) with this changeset’s parent, time with this changeset, time difference (negative is better), time ratio (less than 1 is better). ``` mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97) mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97) mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00) mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82) mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82) mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96) mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95) mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78) mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81) mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78) mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82) mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96) mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98) mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82) mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82) netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99) netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87) ``` Differential Revision: https://phab.mercurial-scm.org/D12175

rust: remove unused `StatusError::IO` enum variant All `io::Error` cases are now handled through PatternFileWarning or BadMatch Differential Revision: https://phab.mercurial-scm.org/D12174

copyright: it's 2022 Differential Revision: https://phab.mercurial-scm.org/D12183

hghave: update rustfmt criterion In 9ebc10ad4a04 I updated `rustfmt` without touching hghave, which means that the CI has been skipping the format test ever since. Thankfully, only one offending line exists in the code that's been introduced since. Differential Revision: https://phab.mercurial-scm.org/D12180

dirstate-v2: fix infinite loop in pure packer Due to the naive approach to path relative-ness, some tree shapes like the one introduced in the associated test could result in the packer going into an endless loop which allocated new `Node` objects endlessly until the process was killed by Linux's OOM killer. Differential Revision: https://phab.mercurial-scm.org/D12170

contrib: refer to RHEL and derivatives instead of CentOS specifically Differential Revision: https://phab.mercurial-scm.org/D12182

packaging: replace centos8 by rockylinux 8 Differential Revision: https://phab.mercurial-scm.org/D12172