Git has an internal interface for storing and retrieving credentials from system-specific helpers, as well as prompting the user for usernames and passwords. The git-credential command exposes this interface to scripts which may want to retrieve, store, or prompt for credentials in the same manner as Git. The design of this scriptable interface models the internal C API; see m[blue]the Git credential APIm for more background on the concepts.
git-credential takes an "action" option on the command-line (one of fill, approve, or reject) and reads a credential description on stdin (see INPUT/OUTPUT FORMAT).
If the action is fill, git-credential will attempt to add "username" and "password" attributes to the description by reading config files, by contacting any configured credential helpers, or by prompting the user. The username and password attributes of the credential description are then printed to stdout together with the attributes already provided.
If the action is approve, git-credential will send the description to any configured credential helpers, which may store the credential for later use.
If the action is reject, git-credential will send the description to any configured credential helpers, which may erase any stored credential matching the description.
If the action is approve or reject, no output should be emitted.
git credential reads and/or writes (depending on the action used) credential information in its standard input/output. This information can correspond either to keys for which git credential will obtain the login/password information (e.g. host, protocol, path), or to the actual credential data to be obtained (login/password).
The credential is split into a set of named attributes, with one attribute per line. Each attribute is specified by a key-value pair, separated by an = (equals) sign, followed by a newline. The key may contain any bytes except =, newline, or NUL. The value may contain any bytes except newline or NUL. In both cases, all bytes are treated as-is (i.e., there is no quoting, and one cannot transmit a value with newline or NUL in it). The list of attributes is terminated by a blank line or end-of-file. Git understands the following attributes:
- The protocol over which the credential will be used (e.g., https).
- The remote hostname for a network credential.
- The path with which the credential will be used. E.g., for accessing a remote https repository, this will be the repository's path on the server.
- The credential's username, if we already have one (e.g., from a URL, from the user, or from a previously run helper).
- The credential's password, if we are asking it to be stored.
- When this special attribute is read by git credential, the value is parsed as a URL and treated as if its constituent parts were read (e.g., url=https://example.com would behave as if protocol=https and host=example.com had been provided). This can help callers avoid parsing URLs themselves. Note that any components which are missing from the URL (e.g., there is no username in the example above) will be set to empty; if you want to provide a URL and override some attributes, provide the URL attribute first, followed by any overrides.