thodg/got/include/got_error.h

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• Hash : 1d918cf9
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  Date : 2022-02-06T14:56:36
  

  improve error message due to malformed `author' in got.conf tweak and ok stsp@

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• include/got_error.h

• /*
   * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
   * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  /* Error codes */
  #define GOT_ERR_OK		0
  #define GOT_ERR_ERRNO		1
  #define GOT_ERR_NOT_GIT_REPO	2
  #define GOT_ERR_BAD_FILETYPE	3
  #define GOT_ERR_BAD_PATH	4
  #define GOT_ERR_NOT_REF		5
  #define GOT_ERR_IO		6
  #define GOT_ERR_EOF		7
  #define GOT_ERR_DECOMPRESSION	8
  #define GOT_ERR_NO_SPACE	9
  #define GOT_ERR_BAD_OBJ_HDR	10
  #define GOT_ERR_OBJ_TYPE	11
  #define GOT_ERR_BAD_OBJ_DATA	12
  #define GOT_ERR_AMBIGUOUS_ID	13
  #define GOT_ERR_BAD_PACKIDX	14
  #define GOT_ERR_PACKIDX_CSUM	15
  #define GOT_ERR_BAD_PACKFILE	16
  #define GOT_ERR_NO_OBJ		17
  #define GOT_ERR_NOT_IMPL	18
  #define GOT_ERR_OBJ_NOT_PACKED	19
  #define GOT_ERR_BAD_DELTA_CHAIN	20
  #define GOT_ERR_BAD_DELTA	21
  #define GOT_ERR_COMPRESSION	22
  #define GOT_ERR_BAD_OBJ_ID_STR	23
  #define GOT_ERR_WORKTREE_EXISTS	26
  #define GOT_ERR_WORKTREE_META	27
  #define GOT_ERR_WORKTREE_VERS	28
  #define GOT_ERR_WORKTREE_BUSY	29
  #define GOT_ERR_DIR_OBSTRUCTED	30
  #define GOT_ERR_FILE_OBSTRUCTED	31
  #define GOT_ERR_RECURSION	32
  #define GOT_ERR_TIMEOUT		33
  #define GOT_ERR_INTERRUPT	34
  #define GOT_ERR_PRIVSEP_READ	35
  #define GOT_ERR_PRIVSEP_LEN	36
  #define GOT_ERR_PRIVSEP_PIPE	37
  #define GOT_ERR_PRIVSEP_NO_FD	38
  #define GOT_ERR_PRIVSEP_MSG	39
  #define GOT_ERR_PRIVSEP_DIED	40
  #define GOT_ERR_PRIVSEP_EXIT	41
  #define GOT_ERR_PACK_OFFSET	42
  #define GOT_ERR_OBJ_EXISTS	43
  #define GOT_ERR_BAD_OBJ_ID	44
  #define GOT_ERR_ITER_BUSY	45
  #define GOT_ERR_ITER_COMPLETED	46
  #define GOT_ERR_RANGE		47
  #define GOT_ERR_EXPECTED	48 /* for use in regress tests only */
  #define GOT_ERR_CANCELLED	49
  #define GOT_ERR_NO_TREE_ENTRY	50
  #define GOT_ERR_FILEIDX_SIG	51
  #define GOT_ERR_FILEIDX_VER	52
  #define GOT_ERR_FILEIDX_CSUM	53
  #define GOT_ERR_PATH_PREFIX	54
  #define GOT_ERR_ANCESTRY	55
  #define GOT_ERR_FILEIDX_BAD	56
  #define GOT_ERR_BAD_REF_DATA	57
  #define GOT_ERR_TREE_DUP_ENTRY	58
  #define GOT_ERR_DIR_DUP_ENTRY	59
  #define GOT_ERR_NOT_WORKTREE	60
  #define GOT_ERR_UUID_VERSION	61
  #define GOT_ERR_UUID_INVALID	62
  #define GOT_ERR_UUID		63
  #define GOT_ERR_LOCKFILE_TIMEOUT 64
  #define GOT_ERR_BAD_REF_NAME	65
  #define GOT_ERR_WORKTREE_REPO	66
  #define GOT_ERR_FILE_MODIFIED	67
  #define GOT_ERR_FILE_STATUS	68
  #define GOT_ERR_COMMIT_CONFLICT	69
  #define GOT_ERR_BAD_REF_TYPE	70
  #define GOT_ERR_COMMIT_NO_AUTHOR 71
  #define GOT_ERR_COMMIT_HEAD_CHANGED 72
  #define GOT_ERR_COMMIT_OUT_OF_DATE 73
  #define GOT_ERR_COMMIT_MSG_EMPTY 74
  #define GOT_ERR_DIR_NOT_EMPTY	75
  #define GOT_ERR_COMMIT_NO_CHANGES 76
  #define GOT_ERR_BRANCH_MOVED	77
  #define GOT_ERR_OBJ_TOO_LARGE	78
  #define GOT_ERR_SAME_BRANCH	79
  #define GOT_ERR_ROOT_COMMIT	80
  #define GOT_ERR_MIXED_COMMITS	81
  #define GOT_ERR_CONFLICTS	82
  #define GOT_ERR_BRANCH_EXISTS	83
  #define GOT_ERR_MODIFIED	84
  #define GOT_ERR_NOT_REBASING	85
  #define GOT_ERR_EMPTY_REBASE	86
  #define GOT_ERR_REBASE_COMMITID	87
  #define GOT_ERR_REBASING	88
  #define GOT_ERR_REBASE_PATH	89
  #define GOT_ERR_NOT_HISTEDIT	90
  #define GOT_ERR_EMPTY_HISTEDIT	91
  #define GOT_ERR_NO_HISTEDIT_CMD	92
  #define GOT_ERR_HISTEDIT_SYNTAX	93
  #define GOT_ERR_HISTEDIT_CANCEL	94
  /* 95 is currently unused */
  #define GOT_ERR_HISTEDIT_BUSY	96
  #define GOT_ERR_HISTEDIT_CMD	97
  #define GOT_ERR_HISTEDIT_PATH	98
  /* 99 is currently unused */
  #define GOT_ERR_COMMIT_BRANCH	100
  #define GOT_ERR_FILE_STAGED	101
  #define GOT_ERR_STAGE_NO_CHANGE	102
  #define GOT_ERR_STAGE_CONFLICT	103
  #define GOT_ERR_STAGE_OUT_OF_DATE 104
  #define GOT_ERR_FILE_NOT_STAGED 105
  #define GOT_ERR_STAGED_PATHS	106
  #define GOT_ERR_PATCH_CHOICE	107
  #define GOT_ERR_COMMIT_NO_EMAIL	108
  #define GOT_ERR_TAG_EXISTS	109
  #define GOT_ERR_GIT_REPO_FORMAT	110
  #define GOT_ERR_REBASE_REQUIRED	111
  #define GOT_ERR_REGEX		112
  #define GOT_ERR_REF_NAME_MINUS	113
  #define GOT_ERR_GITCONFIG_SYNTAX 114
  #define GOT_ERR_REBASE_OUT_OF_DATE 115
  #define GOT_ERR_CACHE_DUP_ENTRY	116
  #define GOT_ERR_QUERYSTRING	117
  #define GOT_ERR_FETCH_FAILED	118
  #define GOT_ERR_PARSE_URI	119
  #define GOT_ERR_BAD_PROTO	120
  #define GOT_ERR_ADDRINFO	121
  #define GOT_ERR_BAD_PACKET	122
  #define GOT_ERR_NO_REMOTE	123
  #define GOT_ERR_FETCH_NO_BRANCH	124
  #define GOT_ERR_FETCH_BAD_REF	125
  #define GOT_ERR_TREE_ENTRY_TYPE	126
  #define GOT_ERR_PARSE_CONFIG	127
  #define GOT_ERR_NO_CONFIG_FILE	128
  #define GOT_ERR_BAD_SYMLINK	129
  #define GOT_ERR_GIT_REPO_EXT	130
  #define GOT_ERR_CANNOT_PACK	131
  #define GOT_ERR_LONELY_PACKIDX	132
  #define GOT_ERR_OBJ_CSUM	133
  #define GOT_ERR_SEND_BAD_REF	134
  #define GOT_ERR_SEND_FAILED	135
  #define GOT_ERR_SEND_EMPTY	136
  #define GOT_ERR_SEND_ANCESTRY	137
  #define GOT_ERR_CAPA_DELETE_REFS 138
  #define GOT_ERR_SEND_DELETE_REF	139
  #define GOT_ERR_SEND_TAG_EXISTS	140
  #define GOT_ERR_NOT_MERGING	141
  #define GOT_ERR_MERGE_OUT_OF_DATE 142
  #define GOT_ERR_MERGE_STAGED_PATHS 143
  #define GOT_ERR_MERGE_COMMIT_OUT_OF_DATE 143
  #define GOT_ERR_MERGE_BUSY	144
  #define GOT_ERR_MERGE_PATH	145
  #define GOT_ERR_FILE_BINARY	146
  
  static const struct got_error {
  	int code;
  	const char *msg;
  } got_errors[] = {
  	{ GOT_ERR_OK,		"no error occured?!?" },
  	{ GOT_ERR_ERRNO,	"see errno" },
  	{ GOT_ERR_NOT_GIT_REPO, "no git repository found" },
  	{ GOT_ERR_BAD_FILETYPE,	"bad file type" },
  	{ GOT_ERR_BAD_PATH,	"bad path" },
  	{ GOT_ERR_NOT_REF,	"no such reference found" },
  	{ GOT_ERR_IO,		"input/output error" },
  	{ GOT_ERR_EOF,		"unexpected end of file" },
  	{ GOT_ERR_DECOMPRESSION,"decompression failed" },
  	{ GOT_ERR_NO_SPACE,	"buffer too small" },
  	{ GOT_ERR_BAD_OBJ_HDR,	"bad object header" },
  	{ GOT_ERR_OBJ_TYPE,	"wrong type of object" },
  	{ GOT_ERR_BAD_OBJ_DATA,	"bad object data" },
  	{ GOT_ERR_AMBIGUOUS_ID, "ambiguous object ID" },
  	{ GOT_ERR_BAD_PACKIDX,	"bad pack index file" },
  	{ GOT_ERR_PACKIDX_CSUM, "pack index file checksum error" },
  	{ GOT_ERR_BAD_PACKFILE,	"bad pack file" },
  	{ GOT_ERR_NO_OBJ,	"object not found" },
  	{ GOT_ERR_NOT_IMPL,	"feature not implemented" },
  	{ GOT_ERR_OBJ_NOT_PACKED,"object is not packed" },
  	{ GOT_ERR_BAD_DELTA_CHAIN,"bad delta chain" },
  	{ GOT_ERR_BAD_DELTA,	"bad delta" },
  	{ GOT_ERR_COMPRESSION,	"compression failed" },
  	{ GOT_ERR_BAD_OBJ_ID_STR,"bad object id string" },
  	{ GOT_ERR_WORKTREE_EXISTS,"worktree already exists" },
  	{ GOT_ERR_WORKTREE_META,"bad worktree meta data" },
  	{ GOT_ERR_WORKTREE_VERS,"unsupported worktree format version" },
  	{ GOT_ERR_WORKTREE_BUSY,"worktree already locked" },
  	{ GOT_ERR_FILE_OBSTRUCTED,"file is obstructed" },
  	{ GOT_ERR_RECURSION,	"recursion limit reached" },
  	{ GOT_ERR_TIMEOUT,	"operation timed out" },
  	{ GOT_ERR_INTERRUPT,	"operation interrupted" },
  	{ GOT_ERR_PRIVSEP_READ,	"no data received in imsg" },
  	{ GOT_ERR_PRIVSEP_LEN,	"unexpected amount of data received in imsg" },
  	{ GOT_ERR_PRIVSEP_PIPE,	"privsep peer process closed pipe" },
  	{ GOT_ERR_PRIVSEP_NO_FD,"privsep file descriptor unavailable" },
  	{ GOT_ERR_PRIVSEP_MSG,	"received unexpected privsep message" },
  	{ GOT_ERR_PRIVSEP_DIED,	"unprivileged process died unexpectedly" },
  	{ GOT_ERR_PRIVSEP_EXIT,	"bad exit code from unprivileged process" },
  	{ GOT_ERR_PACK_OFFSET,	"bad offset in pack file" },
  	{ GOT_ERR_OBJ_EXISTS,	"object already exists" },
  	{ GOT_ERR_BAD_OBJ_ID,	"bad object id" },
  	{ GOT_ERR_ITER_BUSY,	"iteration already in progress" },
  	{ GOT_ERR_ITER_COMPLETED,"iteration completed" },
  	{ GOT_ERR_RANGE,	"value out of range" },
  	{ GOT_ERR_EXPECTED,	"expected an error but have no error" },
  	{ GOT_ERR_CANCELLED,	"operation in progress has been cancelled" },
  	{ GOT_ERR_NO_TREE_ENTRY,"no such entry found in tree" },
  	{ GOT_ERR_FILEIDX_SIG,	"bad file index signature" },
  	{ GOT_ERR_FILEIDX_VER,	"unknown file index format version" },
  	{ GOT_ERR_FILEIDX_CSUM,	"bad file index checksum" },
  	{ GOT_ERR_PATH_PREFIX,	"worktree already contains items from a "
  				"different path prefix" },
  	{ GOT_ERR_ANCESTRY,	"target commit is on a different branch" },
  	{ GOT_ERR_FILEIDX_BAD,	"file index is corrupt" },
  	{ GOT_ERR_BAD_REF_DATA,	"could not parse reference data" },
  	{ GOT_ERR_TREE_DUP_ENTRY,"duplicate entry in tree object" },
  	{ GOT_ERR_DIR_DUP_ENTRY,"duplicate entry in directory" },
  	{ GOT_ERR_NOT_WORKTREE, "no got work tree found" },
  	{ GOT_ERR_UUID_VERSION, "bad uuid version" },
  	{ GOT_ERR_UUID_INVALID, "uuid invalid" },
  	{ GOT_ERR_UUID,		"uuid error" },
  	{ GOT_ERR_LOCKFILE_TIMEOUT,"lockfile timeout" },
  	{ GOT_ERR_BAD_REF_NAME,	"bad reference name" },
  	{ GOT_ERR_WORKTREE_REPO,"cannot create worktree inside a git repository" },
  	{ GOT_ERR_FILE_MODIFIED,"file contains modifications" },
  	{ GOT_ERR_FILE_STATUS,	"file has unexpected status" },
  	{ GOT_ERR_COMMIT_CONFLICT,"cannot commit file in conflicted status" },
  	{ GOT_ERR_BAD_REF_TYPE,	"bad reference type" },
  	{ GOT_ERR_COMMIT_NO_AUTHOR,"GOT_AUTHOR environment variable is not set" },
  	{ GOT_ERR_COMMIT_HEAD_CHANGED, "branch head in repository has changed "
  	    "while commit was in progress" },
  	{ GOT_ERR_COMMIT_OUT_OF_DATE, "work tree must be updated before these "
  	    "changes can be committed" },
  	{ GOT_ERR_COMMIT_MSG_EMPTY, "commit message cannot be empty" },
  	{ GOT_ERR_DIR_NOT_EMPTY, "directory exists and is not empty" },
  	{ GOT_ERR_COMMIT_NO_CHANGES, "no changes to commit" },
  	{ GOT_ERR_BRANCH_MOVED,	"work tree's head reference now points to a "
  	    "different branch; new head reference and/or update -b required" },
  	{ GOT_ERR_OBJ_TOO_LARGE,	"object too large" },
  	{ GOT_ERR_SAME_BRANCH,	"commit is already contained in this branch" },
  	{ GOT_ERR_ROOT_COMMIT,	"specified commit has no parent commit" },
  	{ GOT_ERR_MIXED_COMMITS,"work tree contains files from multiple "
  	    "base commits; the entire work tree must be updated first" },
  	{ GOT_ERR_CONFLICTS,	"work tree contains conflicted files; these "
  	    "conflicts must be resolved first" },
  	{ GOT_ERR_BRANCH_EXISTS,"specified branch already exists" },
  	{ GOT_ERR_MODIFIED,	"work tree contains local changes; these "
  	    "changes must be committed or reverted first" },
  	{ GOT_ERR_NOT_REBASING,	"rebase operation not in progress" },
  	{ GOT_ERR_EMPTY_REBASE,	"no commits to rebase" },
  	{ GOT_ERR_REBASE_COMMITID,"rebase commit ID mismatch" },
  	{ GOT_ERR_REBASING,	"a rebase operation is in progress in this "
  	    "work tree and must be continued or aborted first" },
  	{ GOT_ERR_REBASE_PATH,	"cannot rebase branch which contains "
  	    "changes outside of this work tree's path prefix" },
  	{ GOT_ERR_NOT_HISTEDIT,	"histedit operation not in progress" },
  	{ GOT_ERR_EMPTY_HISTEDIT,"no commits to edit; perhaps the work tree "
  	    "must be updated to an older commit first" },
  	{ GOT_ERR_NO_HISTEDIT_CMD,"no histedit commands provided" },
  	{ GOT_ERR_HISTEDIT_SYNTAX,"syntax error in histedit command list" },
  	{ GOT_ERR_HISTEDIT_CANCEL,"histedit operation cancelled" },
  	{ 95, "unused error code" },
  	{ GOT_ERR_HISTEDIT_BUSY,"histedit operation is in progress in this "
  	    "work tree and must be continued or aborted first" },
  	{ GOT_ERR_HISTEDIT_CMD, "bad histedit command" },
  	{ GOT_ERR_HISTEDIT_PATH, "cannot edit branch history which contains "
  	    "changes outside of this work tree's path prefix" },
  	{ 99, "unused error code" },
  	{ GOT_ERR_COMMIT_BRANCH, "will not commit to a branch outside the "
  	    "\"refs/heads/\" reference namespace" },
  	{ GOT_ERR_FILE_STAGED, "file is staged" },
  	{ GOT_ERR_STAGE_NO_CHANGE, "no changes to stage" },
  	{ GOT_ERR_STAGE_CONFLICT, "cannot stage file in conflicted status" },
  	{ GOT_ERR_STAGE_OUT_OF_DATE, "work tree must be updated before "
  	    "changes can be staged" },
  	{ GOT_ERR_FILE_NOT_STAGED, "file is not staged" },
  	{ GOT_ERR_STAGED_PATHS, "work tree contains files with staged "
  	    "changes; these changes must be committed or unstaged first" },
  	{ GOT_ERR_PATCH_CHOICE, "invalid patch choice" },
  	{ GOT_ERR_COMMIT_NO_EMAIL, "commit author's email address is required "
  	    "for compatibility with Git" },
  	{ GOT_ERR_TAG_EXISTS,"specified tag already exists" },
  	{ GOT_ERR_GIT_REPO_FORMAT,"unknown git repository format version" },
  	{ GOT_ERR_REBASE_REQUIRED,"specified branch must be rebased first" },
  	{ GOT_ERR_REGEX, "regular expression error" },
  	{ GOT_ERR_REF_NAME_MINUS, "reference name may not start with '-'" },
  	{ GOT_ERR_GITCONFIG_SYNTAX, "gitconfig syntax error" },
  	{ GOT_ERR_REBASE_OUT_OF_DATE, "work tree must be updated before it "
  	    "can be used to rebase a branch" },
  	{ GOT_ERR_CACHE_DUP_ENTRY, "duplicate cache entry" },
  	{ GOT_ERR_QUERYSTRING, "bad querystring" },
  	{ GOT_ERR_FETCH_FAILED, "fetch failed" },
  	{ GOT_ERR_PARSE_URI, "failed to parse uri" },
  	{ GOT_ERR_BAD_PROTO, "unknown protocol" },
  	{ GOT_ERR_ADDRINFO, "getaddrinfo failed" },
  	{ GOT_ERR_BAD_PACKET, "bad packet received" },
  	{ GOT_ERR_NO_REMOTE, "remote repository not found" },
  	{ GOT_ERR_FETCH_NO_BRANCH, "could not find any branches to fetch" },
  	{ GOT_ERR_FETCH_BAD_REF, "reference cannot be fetched" },
  	{ GOT_ERR_TREE_ENTRY_TYPE, "unexpected tree entry type" },
  	{ GOT_ERR_PARSE_CONFIG, "configuration file syntax error" },
  	{ GOT_ERR_NO_CONFIG_FILE, "configuration file doesn't exit" },
  	{ GOT_ERR_BAD_SYMLINK, "symbolic link points outside of paths under "
  	    "version control" },
  	{ GOT_ERR_GIT_REPO_EXT, "unsupported repository format extension" },
  	{ GOT_ERR_CANNOT_PACK, "not enough objects to pack" },
  	{ GOT_ERR_LONELY_PACKIDX, "pack index has no corresponding pack file; "
  	    "pack file must be restored or 'gotadmin cleanup -p' must be run" },
  	{ GOT_ERR_OBJ_CSUM, "bad object checksum" },
  	{ GOT_ERR_SEND_BAD_REF, "reference cannot be sent" },
  	{ GOT_ERR_SEND_FAILED, "could not send pack file" },
  	{ GOT_ERR_SEND_EMPTY, "no references to send" },
  	{ GOT_ERR_SEND_ANCESTRY, "fetch and rebase required" },
  	{ GOT_ERR_CAPA_DELETE_REFS, "server cannot delete references" },
  	{ GOT_ERR_SEND_DELETE_REF, "reference cannot be deleted" },
  	{ GOT_ERR_SEND_TAG_EXISTS, "tag already exists on server" },
  	{ GOT_ERR_NOT_MERGING,	"merge operation not in progress" },
  	{ GOT_ERR_MERGE_OUT_OF_DATE, "work tree must be updated before it "
  	    "can be used to merge a branch" },
  	{ GOT_ERR_MERGE_STAGED_PATHS, "work tree contains files with staged "
  	    "changes; these changes must be unstaged before merging can "
  	    "proceed" },
  	{ GOT_ERR_MERGE_COMMIT_OUT_OF_DATE, "merging cannot proceed because "
  	    "the work tree is no longer up-to-date; merge must be aborted "
  	    "and retried" },
  	{ GOT_ERR_MERGE_BUSY,"a merge operation is in progress in this "
  	    "work tree and must be continued or aborted first" },
  	{ GOT_ERR_MERGE_PATH,	"cannot merge branch which contains "
  	    "changes outside of this work tree's path prefix" },
  	{ GOT_ERR_FILE_BINARY, "found a binary file instead of text" },
  };
  
  /*
   * Get an error object from the above list, for a given error code.
   * The error message is fixed.
   */
  const struct got_error *got_error(int);
  
  /*
   * Get an error object from the above list, for a given error code.
   * Use the specified error message instead of the default one.
   * Caution: If the message buffer lives in dynamically allocated memory,
   * then this memory likely won't be freed.
   */
  const struct got_error *got_error_msg(int, const char *);
  
  /*
   * Get a statically allocated error object with code GOT_ERR_ERRNO
   * and an error message obtained from strerror(3), prefixed with a
   * string.
   */
  const struct got_error *got_error_from_errno(const char *);
  
  /*
   * Get a statically allocated error object with code GOT_ERR_ERRNO
   * and an error message obtained from strerror(3), prefixed with two
   * strings.
   */
  const struct got_error *got_error_from_errno2(const char *, const char *);
  
  /*
   * Get a statically allocated error object with code GOT_ERR_ERRNO
   * and an error message obtained from strerror(3), prefixed with three
   * strings.
   */
  const struct got_error *got_error_from_errno3(const char *, const char *,
      const char *);
  
  /*
   * Get a statically allocated error object with code GOT_ERR_ERRNO
   * and an error message obtained from strerror(3), prefixed with a
   * string built with vsnprintf(3) from the provided format string
   * and the variable-length list of additional arguments.
   */
  const struct got_error *got_error_from_errno_fmt(const char *, ...);
  
  /*
   * Set errno to the specified error code and return a statically
   * allocated error object with code GOT_ERR_ERRNO and an error
   * message obtained from strerror(3), optionally prefixed with a
   * string.
   */
  const struct got_error *got_error_set_errno(int, const char *);
  
  /*
   * If ferror(3) indicates an error status for the FILE, obtain an error
   * from got_error_from_errno(). Else, obtain the error via got_error()
   * with the error code provided in the second argument.
   */
  const struct got_error *got_ferror(FILE *, int);
  
  /*
   * Obtain an error with code GOT_ERR_NO_OBJ and an error message which
   * contains the specified object ID. The message buffer is statically
   * allocated; future invocations of this function will overwrite the
   * message set during earlier invocations.
   */
  struct got_object_id; /* forward declaration */
  const struct got_error *got_error_no_obj(struct got_object_id *);
  
  /*
   * Obtain an error with code GOT_ERR_NOT_REF and an error message which
   * contains the specified reference name. The message buffer is statically
   * allocated; future invocations of this function will overwrite the
   * message set during earlier invocations.
   */
  const struct got_error *got_error_not_ref(const char *);
  
  /* Return an error based on a uuid(3) status code. */
  const struct got_error *got_error_uuid(uint32_t, const char *);
  
  /* Return an error with a path prefixed to the error message. */
  const struct got_error *got_error_path(const char *, int);
  
  /*
   * Return an error with an error message prefix built by vsnprintf(3)
   * from the provided format string and the variable-length list of
   * additional arguments.
  */
  const struct got_error *got_error_fmt(int, const char *, ...);
  
  /*
   * Check whether open(2) with O_NOFOLLOW failed on a symlink.
   * This must be called directly after open(2) because it uses errno!
   */
  int got_err_open_nofollow_on_symlink(void);
  

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