diff options
Diffstat (limited to 'Documentation/technical')
| -rw-r--r-- | Documentation/technical/api-config.txt | 319 | ||||
| -rw-r--r-- | Documentation/technical/api-submodule-config.txt | 2 | ||||
| -rw-r--r-- | Documentation/technical/api-trace2.txt | 14 | ||||
| -rw-r--r-- | Documentation/technical/commit-graph.txt | 12 | ||||
| -rw-r--r-- | Documentation/technical/hash-function-transition.txt | 4 | ||||
| -rw-r--r-- | Documentation/technical/index-format.txt | 4 | ||||
| -rw-r--r-- | Documentation/technical/pack-protocol.txt | 2 | ||||
| -rw-r--r-- | Documentation/technical/partial-clone.txt | 2 | ||||
| -rw-r--r-- | Documentation/technical/protocol-v2.txt | 2 | ||||
| -rw-r--r-- | Documentation/technical/rerere.txt | 2 |
10 files changed, 22 insertions, 341 deletions
diff --git a/Documentation/technical/api-config.txt b/Documentation/technical/api-config.txt deleted file mode 100644 index 7d20716c32..0000000000 --- a/Documentation/technical/api-config.txt +++ /dev/null @@ -1,319 +0,0 @@ -config API -========== - -The config API gives callers a way to access Git configuration files -(and files which have the same syntax). See linkgit:git-config[1] for a -discussion of the config file syntax. - -General Usage -------------- - -Config files are parsed linearly, and each variable found is passed to a -caller-provided callback function. The callback function is responsible -for any actions to be taken on the config option, and is free to ignore -some options. It is not uncommon for the configuration to be parsed -several times during the run of a Git program, with different callbacks -picking out different variables useful to themselves. - -A config callback function takes three parameters: - -- the name of the parsed variable. This is in canonical "flat" form: the - section, subsection, and variable segments will be separated by dots, - and the section and variable segments will be all lowercase. E.g., - `core.ignorecase`, `diff.SomeType.textconv`. - -- the value of the found variable, as a string. If the variable had no - value specified, the value will be NULL (typically this means it - should be interpreted as boolean true). - -- a void pointer passed in by the caller of the config API; this can - contain callback-specific data - -A config callback should return 0 for success, or -1 if the variable -could not be parsed properly. - -Basic Config Querying ---------------------- - -Most programs will simply want to look up variables in all config files -that Git knows about, using the normal precedence rules. To do this, -call `git_config` with a callback function and void data pointer. - -`git_config` will read all config sources in order of increasing -priority. Thus a callback should typically overwrite previously-seen -entries with new ones (e.g., if both the user-wide `~/.gitconfig` and -repo-specific `.git/config` contain `color.ui`, the config machinery -will first feed the user-wide one to the callback, and then the -repo-specific one; by overwriting, the higher-priority repo-specific -value is left at the end). - -The `config_with_options` function lets the caller examine config -while adjusting some of the default behavior of `git_config`. It should -almost never be used by "regular" Git code that is looking up -configuration variables. It is intended for advanced callers like -`git-config`, which are intentionally tweaking the normal config-lookup -process. It takes two extra parameters: - -`config_source`:: -If this parameter is non-NULL, it specifies the source to parse for -configuration, rather than looking in the usual files. See `struct -git_config_source` in `config.h` for details. Regular `git_config` defaults -to `NULL`. - -`opts`:: -Specify options to adjust the behavior of parsing config files. See `struct -config_options` in `config.h` for details. As an example: regular `git_config` -sets `opts.respect_includes` to `1` by default. - -Reading Specific Files ----------------------- - -To read a specific file in git-config format, use -`git_config_from_file`. This takes the same callback and data parameters -as `git_config`. - -Querying For Specific Variables -------------------------------- - -For programs wanting to query for specific variables in a non-callback -manner, the config API provides two functions `git_config_get_value` -and `git_config_get_value_multi`. They both read values from an internal -cache generated previously from reading the config files. - -`int git_config_get_value(const char *key, const char **value)`:: - - Finds the highest-priority value for the configuration variable `key`, - stores the pointer to it in `value` and returns 0. When the - configuration variable `key` is not found, returns 1 without touching - `value`. The caller should not free or modify `value`, as it is owned - by the cache. - -`const struct string_list *git_config_get_value_multi(const char *key)`:: - - Finds and returns the value list, sorted in order of increasing priority - for the configuration variable `key`. When the configuration variable - `key` is not found, returns NULL. The caller should not free or modify - the returned pointer, as it is owned by the cache. - -`void git_config_clear(void)`:: - - Resets and invalidates the config cache. - -The config API also provides type specific API functions which do conversion -as well as retrieval for the queried variable, including: - -`int git_config_get_int(const char *key, int *dest)`:: - - Finds and parses the value to an integer for the configuration variable - `key`. Dies on error; otherwise, stores the value of the parsed integer in - `dest` and returns 0. When the configuration variable `key` is not found, - returns 1 without touching `dest`. - -`int git_config_get_ulong(const char *key, unsigned long *dest)`:: - - Similar to `git_config_get_int` but for unsigned longs. - -`int git_config_get_bool(const char *key, int *dest)`:: - - Finds and parses the value into a boolean value, for the configuration - variable `key` respecting keywords like "true" and "false". Integer - values are converted into true/false values (when they are non-zero or - zero, respectively). Other values cause a die(). If parsing is successful, - stores the value of the parsed result in `dest` and returns 0. When the - configuration variable `key` is not found, returns 1 without touching - `dest`. - -`int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)`:: - - Similar to `git_config_get_bool`, except that integers are copied as-is, - and `is_bool` flag is unset. - -`int git_config_get_maybe_bool(const char *key, int *dest)`:: - - Similar to `git_config_get_bool`, except that it returns -1 on error - rather than dying. - -`int git_config_get_string_const(const char *key, const char **dest)`:: - - Allocates and copies the retrieved string into the `dest` parameter for - the configuration variable `key`; if NULL string is given, prints an - error message and returns -1. When the configuration variable `key` is - not found, returns 1 without touching `dest`. - -`int git_config_get_string(const char *key, char **dest)`:: - - Similar to `git_config_get_string_const`, except that retrieved value - copied into the `dest` parameter is a mutable string. - -`int git_config_get_pathname(const char *key, const char **dest)`:: - - Similar to `git_config_get_string`, but expands `~` or `~user` into - the user's home directory when found at the beginning of the path. - -`git_die_config(const char *key, const char *err, ...)`:: - - First prints the error message specified by the caller in `err` and then - dies printing the line number and the file name of the highest priority - value for the configuration variable `key`. - -`void git_die_config_linenr(const char *key, const char *filename, int linenr)`:: - - Helper function which formats the die error message according to the - parameters entered. Used by `git_die_config()`. It can be used by callers - handling `git_config_get_value_multi()` to print the correct error message - for the desired value. - -See test-config.c for usage examples. - -Value Parsing Helpers ---------------------- - -To aid in parsing string values, the config API provides callbacks with -a number of helper functions, including: - -`git_config_int`:: -Parse the string to an integer, including unit factors. Dies on error; -otherwise, returns the parsed result. - -`git_config_ulong`:: -Identical to `git_config_int`, but for unsigned longs. - -`git_config_bool`:: -Parse a string into a boolean value, respecting keywords like "true" and -"false". Integer values are converted into true/false values (when they -are non-zero or zero, respectively). Other values cause a die(). If -parsing is successful, the return value is the result. - -`git_config_bool_or_int`:: -Same as `git_config_bool`, except that integers are returned as-is, and -an `is_bool` flag is unset. - -`git_parse_maybe_bool`:: -Same as `git_config_bool`, except that it returns -1 on error rather -than dying. - -`git_config_string`:: -Allocates and copies the value string into the `dest` parameter; if no -string is given, prints an error message and returns -1. - -`git_config_pathname`:: -Similar to `git_config_string`, but expands `~` or `~user` into the -user's home directory when found at the beginning of the path. - -Include Directives ------------------- - -By default, the config parser does not respect include directives. -However, a caller can use the special `git_config_include` wrapper -callback to support them. To do so, you simply wrap your "real" callback -function and data pointer in a `struct config_include_data`, and pass -the wrapper to the regular config-reading functions. For example: - -------------------------------------------- -int read_file_with_include(const char *file, config_fn_t fn, void *data) -{ - struct config_include_data inc = CONFIG_INCLUDE_INIT; - inc.fn = fn; - inc.data = data; - return git_config_from_file(git_config_include, file, &inc); -} -------------------------------------------- - -`git_config` respects includes automatically. The lower-level -`git_config_from_file` does not. - -Custom Configsets ------------------ - -A `config_set` can be used to construct an in-memory cache for -config-like files that the caller specifies (i.e., files like `.gitmodules`, -`~/.gitconfig` etc.). For example, - ----------------------------------------- -struct config_set gm_config; -git_configset_init(&gm_config); -int b; -/* we add config files to the config_set */ -git_configset_add_file(&gm_config, ".gitmodules"); -git_configset_add_file(&gm_config, ".gitmodules_alt"); - -if (!git_configset_get_bool(gm_config, "submodule.frotz.ignore", &b)) { - /* hack hack hack */ -} - -/* when we are done with the configset */ -git_configset_clear(&gm_config); ----------------------------------------- - -Configset API provides functions for the above mentioned work flow, including: - -`void git_configset_init(struct config_set *cs)`:: - - Initializes the config_set `cs`. - -`int git_configset_add_file(struct config_set *cs, const char *filename)`:: - - Parses the file and adds the variable-value pairs to the `config_set`, - dies if there is an error in parsing the file. Returns 0 on success, or - -1 if the file does not exist or is inaccessible. The user has to decide - if he wants to free the incomplete configset or continue using it when - the function returns -1. - -`int git_configset_get_value(struct config_set *cs, const char *key, const char **value)`:: - - Finds the highest-priority value for the configuration variable `key` - and config set `cs`, stores the pointer to it in `value` and returns 0. - When the configuration variable `key` is not found, returns 1 without - touching `value`. The caller should not free or modify `value`, as it - is owned by the cache. - -`const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)`:: - - Finds and returns the value list, sorted in order of increasing priority - for the configuration variable `key` and config set `cs`. When the - configuration variable `key` is not found, returns NULL. The caller - should not free or modify the returned pointer, as it is owned by the cache. - -`void git_configset_clear(struct config_set *cs)`:: - - Clears `config_set` structure, removes all saved variable-value pairs. - -In addition to above functions, the `config_set` API provides type specific -functions in the vein of `git_config_get_int` and family but with an extra -parameter, pointer to struct `config_set`. -They all behave similarly to the `git_config_get*()` family described in -"Querying For Specific Variables" above. - -Writing Config Files --------------------- - -Git gives multiple entry points in the Config API to write config values to -files namely `git_config_set_in_file` and `git_config_set`, which write to -a specific config file or to `.git/config` respectively. They both take a -key/value pair as parameter. -In the end they both call `git_config_set_multivar_in_file` which takes four -parameters: - -- the name of the file, as a string, to which key/value pairs will be written. - -- the name of key, as a string. This is in canonical "flat" form: the section, - subsection, and variable segments will be separated by dots, and the section - and variable segments will be all lowercase. - E.g., `core.ignorecase`, `diff.SomeType.textconv`. - -- the value of the variable, as a string. If value is equal to NULL, it will - remove the matching key from the config file. - -- the value regex, as a string. It will disregard key/value pairs where value - does not match. - -- a multi_replace value, as an int. If value is equal to zero, nothing or only - one matching key/value is replaced, else all matching key/values (regardless - how many) are removed, before the new pair is written. - -It returns 0 on success. - -Also, there are functions `git_config_rename_section` and -`git_config_rename_section_in_file` with parameters `old_name` and `new_name` -for renaming or removing sections in the config files. If NULL is passed -through `new_name` parameter, the section will be removed from the config file. diff --git a/Documentation/technical/api-submodule-config.txt b/Documentation/technical/api-submodule-config.txt index fb06089393..c409559b86 100644 --- a/Documentation/technical/api-submodule-config.txt +++ b/Documentation/technical/api-submodule-config.txt @@ -58,7 +58,7 @@ Functions Whenever a submodule configuration is parsed in `parse_submodule_config_option` via e.g. `gitmodules_config()`, it will overwrite the null_sha1 entry. -So in the normal case, when HEAD:.gitmodules is parsed first and then overlayed +So in the normal case, when HEAD:.gitmodules is parsed first and then overlaid with the repository configuration, the null_sha1 entry contains the local configuration of a submodule (e.g. consolidated values from local git configuration and the .gitmodules file in the worktree). diff --git a/Documentation/technical/api-trace2.txt b/Documentation/technical/api-trace2.txt index a045dbe422..17490b528c 100644 --- a/Documentation/technical/api-trace2.txt +++ b/Documentation/technical/api-trace2.txt @@ -178,7 +178,7 @@ describe the simplified forms. == Public API -All Trace2 API functions send a messsage to all of the active +All Trace2 API functions send a message to all of the active Trace2 Targets. This section describes the set of available messages. @@ -377,7 +377,7 @@ of `pthread_create()`. and the thread elapsed time. + This function must be called by the thread-proc before it returns -(so that the coorect TLS data is used and cleaned up. It should +(so that the correct TLS data is used and cleaned up). It should not be called by the caller of `pthread_join()`. === Region and Data Messages @@ -406,7 +406,7 @@ The `label` field is an arbitrary label used to describe the activity being started, such as "read_recursive" or "do_read_index". + The `repo` field, if set, will be used to get the "repo-id", so that -recursive oerations can be attributed to the correct repository. +recursive operations can be attributed to the correct repository. `void trace2_region_leave(const char *category, const char *label, const struct repository *repo)`:: @@ -421,7 +421,7 @@ This function pops the region nesting stack on the current thread and reports the elapsed time of the stack frame. + The `category`, `label`, and `repo` fields are the same as above. -The `category` and `label` do not need to match the correpsonding +The `category` and `label` do not need to match the corresponding "region_enter" message, but it makes the data stream easier to understand. @@ -816,7 +816,7 @@ with "?". Note that the session-id of the child process is not available to the current/spawning process, so the child's PID is reported here as a hint for post-processing. (But it is only a hint because the child -proces may be a shell script which doesn't have a session-id.) +process may be a shell script which doesn't have a session-id.) + Note that the `t_rel` field contains the observed run time in seconds for the child process (starting before the fork/exec/spawn and @@ -1176,7 +1176,7 @@ d0 | main | atexit | | 0.028809 | | + Regions may be nested. This causes messages to be indented in the PERF target, for example. -Elapsed times are relative to the start of the correpsonding nesting +Elapsed times are relative to the start of the corresponding nesting level as expected. For example, if we add region message to: + ---------------- @@ -1371,7 +1371,7 @@ d0 | main | atexit | | 0.030027 | | In this example, the preload region took 0.009122 seconds. The 7 threads took between 0.006069 and 0.008947 seconds to work on their portion of the index. Thread "th01" worked on 508 items at offset 0. Thread "th02" -worked on 508 items at offset 2032. Thread "th04" worked on 508 itemts +worked on 508 items at offset 2032. Thread "th04" worked on 508 items at offset 508. + This example also shows that thread names are assigned in a racy manner diff --git a/Documentation/technical/commit-graph.txt b/Documentation/technical/commit-graph.txt index 729fbcb32f..1507117dc2 100644 --- a/Documentation/technical/commit-graph.txt +++ b/Documentation/technical/commit-graph.txt @@ -22,11 +22,11 @@ as "commit-graph" either in the .git/objects/info directory or in the info directory of an alternate. The commit-graph file stores the commit graph structure along with some -extra metadata to speed up graph walks. By listing commit OIDs in lexi- -cographic order, we can identify an integer position for each commit and -refer to the parents of a commit using those integer positions. We use -binary search to find initial commits and then use the integer positions -for fast lookups during the walk. +extra metadata to speed up graph walks. By listing commit OIDs in +lexicographic order, we can identify an integer position for each commit +and refer to the parents of a commit using those integer positions. We +use binary search to find initial commits and then use the integer +positions for fast lookups during the walk. A consumer may load the following info for a commit from the graph: @@ -85,7 +85,7 @@ have generation number represented by the macro GENERATION_NUMBER_ZERO = 0. Since the commit-graph file is closed under reachability, we can guarantee the following weaker condition on all commits: - If A and B are commits with generation numbers N amd M, respectively, + If A and B are commits with generation numbers N and M, respectively, and N < M, then A cannot reach B. Note how the strict inequality differs from the inequality when we have diff --git a/Documentation/technical/hash-function-transition.txt b/Documentation/technical/hash-function-transition.txt index 2ae8fa470a..8a4596bec1 100644 --- a/Documentation/technical/hash-function-transition.txt +++ b/Documentation/technical/hash-function-transition.txt @@ -531,7 +531,7 @@ Until Git protocol gains SHA-256 support, using SHA-256 based storage on public-facing Git servers is strongly discouraged. Once Git protocol gains SHA-256 support, SHA-256 based servers are likely not to support SHA-1 compatibility, to avoid what may be a very expensive -hash reencode during clone and to encourage peers to modernize. +hash re-encode during clone and to encourage peers to modernize. The design described here allows fetches by SHA-1 clients of a personal SHA-256 repository because it's not much more difficult than @@ -602,7 +602,7 @@ git --output-format=sha1 log abac87a^{sha1}..f787cac^{sha256} Choice of Hash -------------- -In early 2005, around the time that Git was written, Xiaoyun Wang, +In early 2005, around the time that Git was written, Xiaoyun Wang, Yiqun Lisa Yin, and Hongbo Yu announced an attack finding SHA-1 collisions in 2^69 operations. In August they published details. Luckily, no practical demonstrations of a collision in full SHA-1 were diff --git a/Documentation/technical/index-format.txt b/Documentation/technical/index-format.txt index 7c4d67aa6a..faa25c5c52 100644 --- a/Documentation/technical/index-format.txt +++ b/Documentation/technical/index-format.txt @@ -318,7 +318,7 @@ The remaining data of each directory block is grouped by type: == End of Index Entry The End of Index Entry (EOIE) is used to locate the end of the variable - length index entries and the begining of the extensions. Code can take + length index entries and the beginning of the extensions. Code can take advantage of this to quickly locate the index extensions without having to parse through all of the index entries. @@ -351,7 +351,7 @@ The remaining data of each directory block is grouped by type: - A number of index offset entries each consisting of: - - 32-bit offset from the begining of the file to the first cache entry + - 32-bit offset from the beginning of the file to the first cache entry in this block of entries. - 32-bit count of cache entries in this block diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt index c73e72de0e..d5ce4eea8a 100644 --- a/Documentation/technical/pack-protocol.txt +++ b/Documentation/technical/pack-protocol.txt @@ -644,7 +644,7 @@ update was successful, or 'ng [refname] [error]' if the update was not. command-ok = PKT-LINE("ok" SP refname) command-fail = PKT-LINE("ng" SP refname SP error-msg) - error-msg = 1*(OCTECT) ; where not "ok" + error-msg = 1*(OCTET) ; where not "ok" ---- Updates can be unsuccessful for a number of reasons. The reference can have diff --git a/Documentation/technical/partial-clone.txt b/Documentation/technical/partial-clone.txt index 210373e258..a6034d5610 100644 --- a/Documentation/technical/partial-clone.txt +++ b/Documentation/technical/partial-clone.txt @@ -32,7 +32,7 @@ if/when needed. A remote that can later provide the missing objects is called a promisor remote, as it promises to send the objects when -requested. Initialy Git supported only one promisor remote, the origin +requested. Initially Git supported only one promisor remote, the origin remote from which the user cloned and that was configured in the "extensions.partialClone" config option. Later support for more than one promisor remote has been implemented. diff --git a/Documentation/technical/protocol-v2.txt b/Documentation/technical/protocol-v2.txt index 40f91f6b1e..7e3766cafb 100644 --- a/Documentation/technical/protocol-v2.txt +++ b/Documentation/technical/protocol-v2.txt @@ -252,7 +252,7 @@ A `fetch` request can take the following arguments: ofs-delta Indicate that the client understands PACKv2 with delta referring to its base by position in pack rather than by an oid. That is, - they can read OBJ_OFS_DELTA (ake type 6) in a packfile. + they can read OBJ_OFS_DELTA (aka type 6) in a packfile. If the 'shallow' feature is advertised the following arguments can be included in the clients request as well as the potential addition of the diff --git a/Documentation/technical/rerere.txt b/Documentation/technical/rerere.txt index aa22d7ace8..af5f9fc24f 100644 --- a/Documentation/technical/rerere.txt +++ b/Documentation/technical/rerere.txt @@ -117,7 +117,7 @@ early A became C or B, a late X became Y or Z". We can see there are 4 combinations of ("B or C", "C or B") x ("X or Y", "Y or X"). By sorting, the conflict is given its canonical name, namely, "an -early part became B or C, a late part becames X or Y", and whenever +early part became B or C, a late part became X or Y", and whenever any of these four patterns appear, and we can get to the same conflict and resolution that we saw earlier. |